1 /* SPDX-License-Identifier: GPL-2.0-or-later * <<
2 /* 1 /*
3 * Scatterlist Cryptographic API. 2 * Scatterlist Cryptographic API.
4 * 3 *
5 * Copyright (c) 2002 James Morris <jmorris@in 4 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
6 * Copyright (c) 2002 David S. Miller (davem@r 5 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
7 * Copyright (c) 2005 Herbert Xu <herbert@gond 6 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
8 * 7 *
9 * Portions derived from Cryptoapi, by Alexand 8 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
10 * and Nettle, by Niels Möller. 9 * and Nettle, by Niels Möller.
>> 10 *
>> 11 * This program is free software; you can redistribute it and/or modify it
>> 12 * under the terms of the GNU General Public License as published by the Free
>> 13 * Software Foundation; either version 2 of the License, or (at your option)
>> 14 * any later version.
>> 15 *
11 */ 16 */
12 #ifndef _LINUX_CRYPTO_H 17 #ifndef _LINUX_CRYPTO_H
13 #define _LINUX_CRYPTO_H 18 #define _LINUX_CRYPTO_H
14 19
15 #include <linux/completion.h> !! 20 #include <linux/atomic.h>
16 #include <linux/refcount.h> !! 21 #include <linux/kernel.h>
>> 22 #include <linux/list.h>
>> 23 #include <linux/bug.h>
17 #include <linux/slab.h> 24 #include <linux/slab.h>
18 #include <linux/types.h> !! 25 #include <linux/string.h>
>> 26 #include <linux/uaccess.h>
>> 27
>> 28 /*
>> 29 * Autoloaded crypto modules should only use a prefixed name to avoid allowing
>> 30 * arbitrary modules to be loaded. Loading from userspace may still need the
>> 31 * unprefixed names, so retains those aliases as well.
>> 32 * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3
>> 33 * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro
>> 34 * expands twice on the same line. Instead, use a separate base name for the
>> 35 * alias.
>> 36 */
>> 37 #define MODULE_ALIAS_CRYPTO(name) \
>> 38 __MODULE_INFO(alias, alias_userspace, name); \
>> 39 __MODULE_INFO(alias, alias_crypto, "crypto-" name)
19 40
20 /* 41 /*
21 * Algorithm masks and types. 42 * Algorithm masks and types.
22 */ 43 */
23 #define CRYPTO_ALG_TYPE_MASK 0x0000 44 #define CRYPTO_ALG_TYPE_MASK 0x0000000f
24 #define CRYPTO_ALG_TYPE_CIPHER 0x0000 45 #define CRYPTO_ALG_TYPE_CIPHER 0x00000001
25 #define CRYPTO_ALG_TYPE_COMPRESS 0x0000 46 #define CRYPTO_ALG_TYPE_COMPRESS 0x00000002
26 #define CRYPTO_ALG_TYPE_AEAD 0x0000 47 #define CRYPTO_ALG_TYPE_AEAD 0x00000003
27 #define CRYPTO_ALG_TYPE_LSKCIPHER 0x0000 !! 48 #define CRYPTO_ALG_TYPE_BLKCIPHER 0x00000004
>> 49 #define CRYPTO_ALG_TYPE_ABLKCIPHER 0x00000005
28 #define CRYPTO_ALG_TYPE_SKCIPHER 0x0000 50 #define CRYPTO_ALG_TYPE_SKCIPHER 0x00000005
29 #define CRYPTO_ALG_TYPE_AKCIPHER 0x0000 !! 51 #define CRYPTO_ALG_TYPE_GIVCIPHER 0x00000006
30 #define CRYPTO_ALG_TYPE_SIG 0x0000 <<
31 #define CRYPTO_ALG_TYPE_KPP 0x0000 52 #define CRYPTO_ALG_TYPE_KPP 0x00000008
32 #define CRYPTO_ALG_TYPE_ACOMPRESS 0x0000 53 #define CRYPTO_ALG_TYPE_ACOMPRESS 0x0000000a
33 #define CRYPTO_ALG_TYPE_SCOMPRESS 0x0000 54 #define CRYPTO_ALG_TYPE_SCOMPRESS 0x0000000b
34 #define CRYPTO_ALG_TYPE_RNG 0x0000 55 #define CRYPTO_ALG_TYPE_RNG 0x0000000c
>> 56 #define CRYPTO_ALG_TYPE_AKCIPHER 0x0000000d
>> 57 #define CRYPTO_ALG_TYPE_DIGEST 0x0000000e
35 #define CRYPTO_ALG_TYPE_HASH 0x0000 58 #define CRYPTO_ALG_TYPE_HASH 0x0000000e
36 #define CRYPTO_ALG_TYPE_SHASH 0x0000 59 #define CRYPTO_ALG_TYPE_SHASH 0x0000000e
37 #define CRYPTO_ALG_TYPE_AHASH 0x0000 60 #define CRYPTO_ALG_TYPE_AHASH 0x0000000f
38 61
>> 62 #define CRYPTO_ALG_TYPE_HASH_MASK 0x0000000e
>> 63 #define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
>> 64 #define CRYPTO_ALG_TYPE_BLKCIPHER_MASK 0x0000000c
39 #define CRYPTO_ALG_TYPE_ACOMPRESS_MASK 0x0000 65 #define CRYPTO_ALG_TYPE_ACOMPRESS_MASK 0x0000000e
40 66
41 #define CRYPTO_ALG_LARVAL 0x0000 67 #define CRYPTO_ALG_LARVAL 0x00000010
42 #define CRYPTO_ALG_DEAD 0x0000 68 #define CRYPTO_ALG_DEAD 0x00000020
43 #define CRYPTO_ALG_DYING 0x0000 69 #define CRYPTO_ALG_DYING 0x00000040
44 #define CRYPTO_ALG_ASYNC 0x0000 70 #define CRYPTO_ALG_ASYNC 0x00000080
45 71
46 /* 72 /*
47 * Set if the algorithm (or an algorithm which !! 73 * Set this bit if and only if the algorithm requires another algorithm of
48 * algorithm of the same type to handle corner !! 74 * the same type to handle corner cases.
49 */ 75 */
50 #define CRYPTO_ALG_NEED_FALLBACK 0x0000 76 #define CRYPTO_ALG_NEED_FALLBACK 0x00000100
51 77
52 /* 78 /*
>> 79 * This bit is set for symmetric key ciphers that have already been wrapped
>> 80 * with a generic IV generator to prevent them from being wrapped again.
>> 81 */
>> 82 #define CRYPTO_ALG_GENIV 0x00000200
>> 83
>> 84 /*
53 * Set if the algorithm has passed automated r 85 * Set if the algorithm has passed automated run-time testing. Note that
54 * if there is no run-time testing for a given 86 * if there is no run-time testing for a given algorithm it is considered
55 * to have passed. 87 * to have passed.
56 */ 88 */
57 89
58 #define CRYPTO_ALG_TESTED 0x0000 90 #define CRYPTO_ALG_TESTED 0x00000400
59 91
60 /* 92 /*
61 * Set if the algorithm is an instance that is 93 * Set if the algorithm is an instance that is built from templates.
62 */ 94 */
63 #define CRYPTO_ALG_INSTANCE 0x0000 95 #define CRYPTO_ALG_INSTANCE 0x00000800
64 96
65 /* Set this bit if the algorithm provided is h 97 /* Set this bit if the algorithm provided is hardware accelerated but
66 * not available to userspace via instruction 98 * not available to userspace via instruction set or so.
67 */ 99 */
68 #define CRYPTO_ALG_KERN_DRIVER_ONLY 0x0000 100 #define CRYPTO_ALG_KERN_DRIVER_ONLY 0x00001000
69 101
70 /* 102 /*
71 * Mark a cipher as a service implementation o 103 * Mark a cipher as a service implementation only usable by another
72 * cipher and never by a normal user of the ke 104 * cipher and never by a normal user of the kernel crypto API
73 */ 105 */
74 #define CRYPTO_ALG_INTERNAL 0x0000 106 #define CRYPTO_ALG_INTERNAL 0x00002000
75 107
76 /* 108 /*
77 * Set if the algorithm has a ->setkey() metho <<
78 * calling it first, i.e. there is a default k <<
79 */ <<
80 #define CRYPTO_ALG_OPTIONAL_KEY 0x0000 <<
81 <<
82 /* <<
83 * Don't trigger module loading <<
84 */ <<
85 #define CRYPTO_NOLOAD 0x0000 <<
86 <<
87 /* <<
88 * The algorithm may allocate memory during re <<
89 * encryption, decryption, or hashing. Users <<
90 * flag unset if they can't handle memory allo <<
91 * <<
92 * This flag is currently only implemented for <<
93 * "aead", "ahash", "shash", and "cipher". Al <<
94 * have this flag set even if they allocate me <<
95 * <<
96 * In some edge cases, algorithms can allocate <<
97 * To avoid these cases, users must obey the f <<
98 * skcipher: <<
99 * - The IV buffer and all scatterlist el <<
100 * algorithm's alignmask. <<
101 * - If the data were to be divided into <<
102 * crypto_skcipher_walksize() (with any <<
103 * chunk can cross a page boundary or a <<
104 * aead: <<
105 * - The IV buffer and all scatterlist el <<
106 * algorithm's alignmask. <<
107 * - The first scatterlist element must c <<
108 * and its pages must be !PageHighMem. <<
109 * - If the plaintext/ciphertext were to <<
110 * crypto_aead_walksize() (with the rem <<
111 * can cross a page boundary or a scatt <<
112 * ahash: <<
113 * - crypto_ahash_finup() must not be use <<
114 * ->finup() natively. <<
115 */ <<
116 #define CRYPTO_ALG_ALLOCATES_MEMORY 0x0001 <<
117 <<
118 /* <<
119 * Mark an algorithm as a service implementati <<
120 * template and never by a normal user of the <<
121 * This is intended to be used by algorithms t <<
122 * not FIPS-approved but may instead be used t <<
123 * a FIPS-approved algorithm (e.g., dh vs. ffd <<
124 */ <<
125 #define CRYPTO_ALG_FIPS_INTERNAL 0x0002 <<
126 <<
127 /* <<
128 * Transform masks and values (for crt_flags). 109 * Transform masks and values (for crt_flags).
129 */ 110 */
130 #define CRYPTO_TFM_NEED_KEY 0x0000 <<
131 <<
132 #define CRYPTO_TFM_REQ_MASK 0x000f 111 #define CRYPTO_TFM_REQ_MASK 0x000fff00
133 #define CRYPTO_TFM_REQ_FORBID_WEAK_KEYS 0x0000 !! 112 #define CRYPTO_TFM_RES_MASK 0xfff00000
>> 113
>> 114 #define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100
134 #define CRYPTO_TFM_REQ_MAY_SLEEP 0x0000 115 #define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200
135 #define CRYPTO_TFM_REQ_MAY_BACKLOG 0x0000 116 #define CRYPTO_TFM_REQ_MAY_BACKLOG 0x00000400
>> 117 #define CRYPTO_TFM_RES_WEAK_KEY 0x00100000
>> 118 #define CRYPTO_TFM_RES_BAD_KEY_LEN 0x00200000
>> 119 #define CRYPTO_TFM_RES_BAD_KEY_SCHED 0x00400000
>> 120 #define CRYPTO_TFM_RES_BAD_BLOCK_LEN 0x00800000
>> 121 #define CRYPTO_TFM_RES_BAD_FLAGS 0x01000000
136 122
137 /* 123 /*
138 * Miscellaneous stuff. 124 * Miscellaneous stuff.
139 */ 125 */
140 #define CRYPTO_MAX_ALG_NAME 128 !! 126 #define CRYPTO_MAX_ALG_NAME 64
141 127
142 /* 128 /*
143 * The macro CRYPTO_MINALIGN_ATTR (along with 129 * The macro CRYPTO_MINALIGN_ATTR (along with the void * type in the actual
144 * declaration) is used to ensure that the cry 130 * declaration) is used to ensure that the crypto_tfm context structure is
145 * aligned correctly for the given architectur 131 * aligned correctly for the given architecture so that there are no alignment
146 * faults for C data types. On architectures !! 132 * faults for C data types. In particular, this is required on platforms such
147 * DMA, such as ARM or arm64, it also takes in !! 133 * as arm where pointers are 32-bit aligned but there are data types such as
148 * that is required to ensure that the context !! 134 * u64 which require 64-bit alignment.
149 * cachelines with the rest of the struct. Thi <<
150 * maintenance for non-coherent DMA (cache inv <<
151 * affect data that may be accessed by the CPU <<
152 */ 135 */
153 #define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN 136 #define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN
154 137
155 #define CRYPTO_MINALIGN_ATTR __attribute__ ((_ 138 #define CRYPTO_MINALIGN_ATTR __attribute__ ((__aligned__(CRYPTO_MINALIGN)))
156 139
>> 140 struct scatterlist;
>> 141 struct crypto_ablkcipher;
>> 142 struct crypto_async_request;
>> 143 struct crypto_blkcipher;
157 struct crypto_tfm; 144 struct crypto_tfm;
158 struct crypto_type; 145 struct crypto_type;
159 struct module; !! 146 struct skcipher_givcrypt_request;
160 147
161 typedef void (*crypto_completion_t)(void *req, !! 148 typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);
162 149
163 /** 150 /**
164 * DOC: Block Cipher Context Data Structures 151 * DOC: Block Cipher Context Data Structures
165 * 152 *
166 * These data structures define the operating 153 * These data structures define the operating context for each block cipher
167 * type. 154 * type.
168 */ 155 */
169 156
170 struct crypto_async_request { 157 struct crypto_async_request {
171 struct list_head list; 158 struct list_head list;
172 crypto_completion_t complete; 159 crypto_completion_t complete;
173 void *data; 160 void *data;
174 struct crypto_tfm *tfm; 161 struct crypto_tfm *tfm;
175 162
176 u32 flags; 163 u32 flags;
177 }; 164 };
178 165
>> 166 struct ablkcipher_request {
>> 167 struct crypto_async_request base;
>> 168
>> 169 unsigned int nbytes;
>> 170
>> 171 void *info;
>> 172
>> 173 struct scatterlist *src;
>> 174 struct scatterlist *dst;
>> 175
>> 176 void *__ctx[] CRYPTO_MINALIGN_ATTR;
>> 177 };
>> 178
>> 179 struct blkcipher_desc {
>> 180 struct crypto_blkcipher *tfm;
>> 181 void *info;
>> 182 u32 flags;
>> 183 };
>> 184
>> 185 struct cipher_desc {
>> 186 struct crypto_tfm *tfm;
>> 187 void (*crfn)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
>> 188 unsigned int (*prfn)(const struct cipher_desc *desc, u8 *dst,
>> 189 const u8 *src, unsigned int nbytes);
>> 190 void *info;
>> 191 };
>> 192
179 /** 193 /**
180 * DOC: Block Cipher Algorithm Definitions 194 * DOC: Block Cipher Algorithm Definitions
181 * 195 *
182 * These data structures define modular crypto 196 * These data structures define modular crypto algorithm implementations,
183 * managed via crypto_register_alg() and crypt 197 * managed via crypto_register_alg() and crypto_unregister_alg().
184 */ 198 */
185 199
186 /** 200 /**
>> 201 * struct ablkcipher_alg - asynchronous block cipher definition
>> 202 * @min_keysize: Minimum key size supported by the transformation. This is the
>> 203 * smallest key length supported by this transformation algorithm.
>> 204 * This must be set to one of the pre-defined values as this is
>> 205 * not hardware specific. Possible values for this field can be
>> 206 * found via git grep "_MIN_KEY_SIZE" include/crypto/
>> 207 * @max_keysize: Maximum key size supported by the transformation. This is the
>> 208 * largest key length supported by this transformation algorithm.
>> 209 * This must be set to one of the pre-defined values as this is
>> 210 * not hardware specific. Possible values for this field can be
>> 211 * found via git grep "_MAX_KEY_SIZE" include/crypto/
>> 212 * @setkey: Set key for the transformation. This function is used to either
>> 213 * program a supplied key into the hardware or store the key in the
>> 214 * transformation context for programming it later. Note that this
>> 215 * function does modify the transformation context. This function can
>> 216 * be called multiple times during the existence of the transformation
>> 217 * object, so one must make sure the key is properly reprogrammed into
>> 218 * the hardware. This function is also responsible for checking the key
>> 219 * length for validity. In case a software fallback was put in place in
>> 220 * the @cra_init call, this function might need to use the fallback if
>> 221 * the algorithm doesn't support all of the key sizes.
>> 222 * @encrypt: Encrypt a scatterlist of blocks. This function is used to encrypt
>> 223 * the supplied scatterlist containing the blocks of data. The crypto
>> 224 * API consumer is responsible for aligning the entries of the
>> 225 * scatterlist properly and making sure the chunks are correctly
>> 226 * sized. In case a software fallback was put in place in the
>> 227 * @cra_init call, this function might need to use the fallback if
>> 228 * the algorithm doesn't support all of the key sizes. In case the
>> 229 * key was stored in transformation context, the key might need to be
>> 230 * re-programmed into the hardware in this function. This function
>> 231 * shall not modify the transformation context, as this function may
>> 232 * be called in parallel with the same transformation object.
>> 233 * @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt
>> 234 * and the conditions are exactly the same.
>> 235 * @givencrypt: Update the IV for encryption. With this function, a cipher
>> 236 * implementation may provide the function on how to update the IV
>> 237 * for encryption.
>> 238 * @givdecrypt: Update the IV for decryption. This is the reverse of
>> 239 * @givencrypt .
>> 240 * @geniv: The transformation implementation may use an "IV generator" provided
>> 241 * by the kernel crypto API. Several use cases have a predefined
>> 242 * approach how IVs are to be updated. For such use cases, the kernel
>> 243 * crypto API provides ready-to-use implementations that can be
>> 244 * referenced with this variable.
>> 245 * @ivsize: IV size applicable for transformation. The consumer must provide an
>> 246 * IV of exactly that size to perform the encrypt or decrypt operation.
>> 247 *
>> 248 * All fields except @givencrypt , @givdecrypt , @geniv and @ivsize are
>> 249 * mandatory and must be filled.
>> 250 */
>> 251 struct ablkcipher_alg {
>> 252 int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
>> 253 unsigned int keylen);
>> 254 int (*encrypt)(struct ablkcipher_request *req);
>> 255 int (*decrypt)(struct ablkcipher_request *req);
>> 256 int (*givencrypt)(struct skcipher_givcrypt_request *req);
>> 257 int (*givdecrypt)(struct skcipher_givcrypt_request *req);
>> 258
>> 259 const char *geniv;
>> 260
>> 261 unsigned int min_keysize;
>> 262 unsigned int max_keysize;
>> 263 unsigned int ivsize;
>> 264 };
>> 265
>> 266 /**
>> 267 * struct blkcipher_alg - synchronous block cipher definition
>> 268 * @min_keysize: see struct ablkcipher_alg
>> 269 * @max_keysize: see struct ablkcipher_alg
>> 270 * @setkey: see struct ablkcipher_alg
>> 271 * @encrypt: see struct ablkcipher_alg
>> 272 * @decrypt: see struct ablkcipher_alg
>> 273 * @geniv: see struct ablkcipher_alg
>> 274 * @ivsize: see struct ablkcipher_alg
>> 275 *
>> 276 * All fields except @geniv and @ivsize are mandatory and must be filled.
>> 277 */
>> 278 struct blkcipher_alg {
>> 279 int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
>> 280 unsigned int keylen);
>> 281 int (*encrypt)(struct blkcipher_desc *desc,
>> 282 struct scatterlist *dst, struct scatterlist *src,
>> 283 unsigned int nbytes);
>> 284 int (*decrypt)(struct blkcipher_desc *desc,
>> 285 struct scatterlist *dst, struct scatterlist *src,
>> 286 unsigned int nbytes);
>> 287
>> 288 const char *geniv;
>> 289
>> 290 unsigned int min_keysize;
>> 291 unsigned int max_keysize;
>> 292 unsigned int ivsize;
>> 293 };
>> 294
>> 295 /**
187 * struct cipher_alg - single-block symmetric 296 * struct cipher_alg - single-block symmetric ciphers definition
188 * @cia_min_keysize: Minimum key size supporte 297 * @cia_min_keysize: Minimum key size supported by the transformation. This is
189 * the smallest key length s 298 * the smallest key length supported by this transformation
190 * algorithm. This must be s 299 * algorithm. This must be set to one of the pre-defined
191 * values as this is not har 300 * values as this is not hardware specific. Possible values
192 * for this field can be fou 301 * for this field can be found via git grep "_MIN_KEY_SIZE"
193 * include/crypto/ 302 * include/crypto/
194 * @cia_max_keysize: Maximum key size supporte 303 * @cia_max_keysize: Maximum key size supported by the transformation. This is
195 * the largest key length sup 304 * the largest key length supported by this transformation
196 * algorithm. This must be se 305 * algorithm. This must be set to one of the pre-defined values
197 * as this is not hardware sp 306 * as this is not hardware specific. Possible values for this
198 * field can be found via git 307 * field can be found via git grep "_MAX_KEY_SIZE"
199 * include/crypto/ 308 * include/crypto/
200 * @cia_setkey: Set key for the transformation 309 * @cia_setkey: Set key for the transformation. This function is used to either
201 * program a supplied key into th 310 * program a supplied key into the hardware or store the key in the
202 * transformation context for pro 311 * transformation context for programming it later. Note that this
203 * function does modify the trans 312 * function does modify the transformation context. This function
204 * can be called multiple times d 313 * can be called multiple times during the existence of the
205 * transformation object, so one 314 * transformation object, so one must make sure the key is properly
206 * reprogrammed into the hardware 315 * reprogrammed into the hardware. This function is also
207 * responsible for checking the k 316 * responsible for checking the key length for validity.
208 * @cia_encrypt: Encrypt a single block. This 317 * @cia_encrypt: Encrypt a single block. This function is used to encrypt a
209 * single block of data, which m 318 * single block of data, which must be @cra_blocksize big. This
210 * always operates on a full @cr 319 * always operates on a full @cra_blocksize and it is not possible
211 * to encrypt a block of smaller 320 * to encrypt a block of smaller size. The supplied buffers must
212 * therefore also be at least of 321 * therefore also be at least of @cra_blocksize size. Both the
213 * input and output buffers are 322 * input and output buffers are always aligned to @cra_alignmask.
214 * In case either of the input o 323 * In case either of the input or output buffer supplied by user
215 * of the crypto API is not alig 324 * of the crypto API is not aligned to @cra_alignmask, the crypto
216 * API will re-align the buffers 325 * API will re-align the buffers. The re-alignment means that a
217 * new buffer will be allocated, 326 * new buffer will be allocated, the data will be copied into the
218 * new buffer, then the processi 327 * new buffer, then the processing will happen on the new buffer,
219 * then the data will be copied 328 * then the data will be copied back into the original buffer and
220 * finally the new buffer will b 329 * finally the new buffer will be freed. In case a software
221 * fallback was put in place in 330 * fallback was put in place in the @cra_init call, this function
222 * might need to use the fallbac 331 * might need to use the fallback if the algorithm doesn't support
223 * all of the key sizes. In case 332 * all of the key sizes. In case the key was stored in
224 * transformation context, the k 333 * transformation context, the key might need to be re-programmed
225 * into the hardware in this fun 334 * into the hardware in this function. This function shall not
226 * modify the transformation con 335 * modify the transformation context, as this function may be
227 * called in parallel with the s 336 * called in parallel with the same transformation object.
228 * @cia_decrypt: Decrypt a single block. This 337 * @cia_decrypt: Decrypt a single block. This is a reverse counterpart to
229 * @cia_encrypt, and the conditi 338 * @cia_encrypt, and the conditions are exactly the same.
230 * 339 *
231 * All fields are mandatory and must be filled 340 * All fields are mandatory and must be filled.
232 */ 341 */
233 struct cipher_alg { 342 struct cipher_alg {
234 unsigned int cia_min_keysize; 343 unsigned int cia_min_keysize;
235 unsigned int cia_max_keysize; 344 unsigned int cia_max_keysize;
236 int (*cia_setkey)(struct crypto_tfm *t 345 int (*cia_setkey)(struct crypto_tfm *tfm, const u8 *key,
237 unsigned int keylen) 346 unsigned int keylen);
238 void (*cia_encrypt)(struct crypto_tfm 347 void (*cia_encrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
239 void (*cia_decrypt)(struct crypto_tfm 348 void (*cia_decrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
240 }; 349 };
241 350
242 /** <<
243 * struct compress_alg - compression/decompres <<
244 * @coa_compress: Compress a buffer of specifi <<
245 * data in the specified buffer <<
246 * compressed data in dlen. <<
247 * @coa_decompress: Decompress the source buff <<
248 * data in the specified buff <<
249 * returned in dlen. <<
250 * <<
251 * All fields are mandatory. <<
252 */ <<
253 struct compress_alg { 351 struct compress_alg {
254 int (*coa_compress)(struct crypto_tfm 352 int (*coa_compress)(struct crypto_tfm *tfm, const u8 *src,
255 unsigned int slen, 353 unsigned int slen, u8 *dst, unsigned int *dlen);
256 int (*coa_decompress)(struct crypto_tf 354 int (*coa_decompress)(struct crypto_tfm *tfm, const u8 *src,
257 unsigned int sle 355 unsigned int slen, u8 *dst, unsigned int *dlen);
258 }; 356 };
259 357
>> 358
>> 359 #define cra_ablkcipher cra_u.ablkcipher
>> 360 #define cra_blkcipher cra_u.blkcipher
260 #define cra_cipher cra_u.cipher 361 #define cra_cipher cra_u.cipher
261 #define cra_compress cra_u.compress 362 #define cra_compress cra_u.compress
262 363
263 /** 364 /**
264 * struct crypto_alg - definition of a cryptog 365 * struct crypto_alg - definition of a cryptograpic cipher algorithm
265 * @cra_flags: Flags describing this transform 366 * @cra_flags: Flags describing this transformation. See include/linux/crypto.h
266 * CRYPTO_ALG_* flags for the flag 367 * CRYPTO_ALG_* flags for the flags which go in here. Those are
267 * used for fine-tuning the descri 368 * used for fine-tuning the description of the transformation
268 * algorithm. 369 * algorithm.
269 * @cra_blocksize: Minimum block size of this 370 * @cra_blocksize: Minimum block size of this transformation. The size in bytes
270 * of the smallest possible un 371 * of the smallest possible unit which can be transformed with
271 * this algorithm. The users m 372 * this algorithm. The users must respect this value.
272 * In case of HASH transformat 373 * In case of HASH transformation, it is possible for a smaller
273 * block than @cra_blocksize t 374 * block than @cra_blocksize to be passed to the crypto API for
274 * transformation, in case of 375 * transformation, in case of any other transformation type, an
275 * error will be returned upon 376 * error will be returned upon any attempt to transform smaller
276 * than @cra_blocksize chunks. 377 * than @cra_blocksize chunks.
277 * @cra_ctxsize: Size of the operational conte 378 * @cra_ctxsize: Size of the operational context of the transformation. This
278 * value informs the kernel cryp 379 * value informs the kernel crypto API about the memory size
279 * needed to be allocated for th 380 * needed to be allocated for the transformation context.
280 * @cra_alignmask: For cipher, skcipher, lskci !! 381 * @cra_alignmask: Alignment mask for the input and output data buffer. The data
281 * 1 less than the alignment, !! 382 * buffer containing the input data for the algorithm must be
282 * implementation requires for !! 383 * aligned to this alignment mask. The data buffer for the
283 * the crypto API is invoked w !! 384 * output data must be aligned to this alignment mask. Note that
284 * to this alignment, the cryp !! 385 * the Crypto API will do the re-alignment in software, but
285 * appropriately aligned tempo !! 386 * only under special conditions and there is a performance hit.
286 * the algorithm needs. (For !! 387 * The re-alignment happens at these occasions for different
287 * the algorithm uses the skci !! 388 * @cra_u types: cipher -- For both input data and output data
288 * misalignment handling carri !! 389 * buffer; ahash -- For output hash destination buf; shash --
289 * preferred that algorithms d !! 390 * For output hash destination buf.
290 * Also, crypto API users may !! 391 * This is needed on hardware which is flawed by design and
291 * to the alignmask of the alg !! 392 * cannot pick data from arbitrary addresses.
292 * avoid the API having to rea <<
293 * not supported for hash algo <<
294 * @cra_priority: Priority of this transformat 393 * @cra_priority: Priority of this transformation implementation. In case
295 * multiple transformations wit 394 * multiple transformations with same @cra_name are available to
296 * the Crypto API, the kernel w 395 * the Crypto API, the kernel will use the one with highest
297 * @cra_priority. 396 * @cra_priority.
298 * @cra_name: Generic name (usable by multiple 397 * @cra_name: Generic name (usable by multiple implementations) of the
299 * transformation algorithm. This i 398 * transformation algorithm. This is the name of the transformation
300 * itself. This field is used by th 399 * itself. This field is used by the kernel when looking up the
301 * providers of particular transfor 400 * providers of particular transformation.
302 * @cra_driver_name: Unique name of the transf 401 * @cra_driver_name: Unique name of the transformation provider. This is the
303 * name of the provider of t 402 * name of the provider of the transformation. This can be any
304 * arbitrary value, but in t 403 * arbitrary value, but in the usual case, this contains the
305 * name of the chip or provi 404 * name of the chip or provider and the name of the
306 * transformation algorithm. 405 * transformation algorithm.
307 * @cra_type: Type of the cryptographic transf 406 * @cra_type: Type of the cryptographic transformation. This is a pointer to
308 * struct crypto_type, which implem 407 * struct crypto_type, which implements callbacks common for all
309 * transformation types. There are !! 408 * transformation types. There are multiple options:
310 * &crypto_skcipher_type, &crypto_a !! 409 * &crypto_blkcipher_type, &crypto_ablkcipher_type,
>> 410 * &crypto_ahash_type, &crypto_rng_type.
311 * This field might be empty. In th 411 * This field might be empty. In that case, there are no common
312 * callbacks. This is the case for: 412 * callbacks. This is the case for: cipher, compress, shash.
313 * @cra_u: Callbacks implementing the transfor 413 * @cra_u: Callbacks implementing the transformation. This is a union of
314 * multiple structures. Depending on t 414 * multiple structures. Depending on the type of transformation selected
315 * by @cra_type and @cra_flags above, 415 * by @cra_type and @cra_flags above, the associated structure must be
316 * filled with callbacks. This field m 416 * filled with callbacks. This field might be empty. This is the case
317 * for ahash, shash. 417 * for ahash, shash.
318 * @cra_init: Initialize the cryptographic tra 418 * @cra_init: Initialize the cryptographic transformation object. This function
319 * is used to initialize the crypto 419 * is used to initialize the cryptographic transformation object.
320 * This function is called only onc 420 * This function is called only once at the instantiation time, right
321 * after the transformation context 421 * after the transformation context was allocated. In case the
322 * cryptographic hardware has some 422 * cryptographic hardware has some special requirements which need to
323 * be handled by software, this fun 423 * be handled by software, this function shall check for the precise
324 * requirement of the transformatio 424 * requirement of the transformation and put any software fallbacks
325 * in place. 425 * in place.
326 * @cra_exit: Deinitialize the cryptographic t 426 * @cra_exit: Deinitialize the cryptographic transformation object. This is a
327 * counterpart to @cra_init, used t 427 * counterpart to @cra_init, used to remove various changes set in
328 * @cra_init. 428 * @cra_init.
329 * @cra_u.cipher: Union member which contains <<
330 * definition. See @struct @cip <<
331 * @cra_u.compress: Union member which contain <<
332 * See @struct @compress_alg. <<
333 * @cra_module: Owner of this transformation i 429 * @cra_module: Owner of this transformation implementation. Set to THIS_MODULE
334 * @cra_list: internally used 430 * @cra_list: internally used
335 * @cra_users: internally used 431 * @cra_users: internally used
336 * @cra_refcnt: internally used 432 * @cra_refcnt: internally used
337 * @cra_destroy: internally used 433 * @cra_destroy: internally used
338 * 434 *
339 * The struct crypto_alg describes a generic C 435 * The struct crypto_alg describes a generic Crypto API algorithm and is common
340 * for all of the transformations. Any variabl 436 * for all of the transformations. Any variable not documented here shall not
341 * be used by a cipher implementation as it is 437 * be used by a cipher implementation as it is internal to the Crypto API.
342 */ 438 */
343 struct crypto_alg { 439 struct crypto_alg {
344 struct list_head cra_list; 440 struct list_head cra_list;
345 struct list_head cra_users; 441 struct list_head cra_users;
346 442
347 u32 cra_flags; 443 u32 cra_flags;
348 unsigned int cra_blocksize; 444 unsigned int cra_blocksize;
349 unsigned int cra_ctxsize; 445 unsigned int cra_ctxsize;
350 unsigned int cra_alignmask; 446 unsigned int cra_alignmask;
351 447
352 int cra_priority; 448 int cra_priority;
353 refcount_t cra_refcnt; !! 449 atomic_t cra_refcnt;
354 450
355 char cra_name[CRYPTO_MAX_ALG_NAME]; 451 char cra_name[CRYPTO_MAX_ALG_NAME];
356 char cra_driver_name[CRYPTO_MAX_ALG_NA 452 char cra_driver_name[CRYPTO_MAX_ALG_NAME];
357 453
358 const struct crypto_type *cra_type; 454 const struct crypto_type *cra_type;
359 455
360 union { 456 union {
>> 457 struct ablkcipher_alg ablkcipher;
>> 458 struct blkcipher_alg blkcipher;
361 struct cipher_alg cipher; 459 struct cipher_alg cipher;
362 struct compress_alg compress; 460 struct compress_alg compress;
363 } cra_u; 461 } cra_u;
364 462
365 int (*cra_init)(struct crypto_tfm *tfm 463 int (*cra_init)(struct crypto_tfm *tfm);
366 void (*cra_exit)(struct crypto_tfm *tf 464 void (*cra_exit)(struct crypto_tfm *tfm);
367 void (*cra_destroy)(struct crypto_alg 465 void (*cra_destroy)(struct crypto_alg *alg);
368 466
369 struct module *cra_module; 467 struct module *cra_module;
370 } CRYPTO_MINALIGN_ATTR; 468 } CRYPTO_MINALIGN_ATTR;
371 469
372 /* 470 /*
373 * A helper struct for waiting for completion !! 471 * Algorithm registration interface.
374 */ <<
375 struct crypto_wait { <<
376 struct completion completion; <<
377 int err; <<
378 }; <<
379 <<
380 /* <<
381 * Macro for declaring a crypto op async wait <<
382 */ 472 */
383 #define DECLARE_CRYPTO_WAIT(_wait) \ !! 473 int crypto_register_alg(struct crypto_alg *alg);
384 struct crypto_wait _wait = { \ !! 474 int crypto_unregister_alg(struct crypto_alg *alg);
385 COMPLETION_INITIALIZER_ONSTACK !! 475 int crypto_register_algs(struct crypto_alg *algs, int count);
386 !! 476 int crypto_unregister_algs(struct crypto_alg *algs, int count);
387 /* <<
388 * Async ops completion helper functioons <<
389 */ <<
390 void crypto_req_done(void *req, int err); <<
391 <<
392 static inline int crypto_wait_req(int err, str <<
393 { <<
394 switch (err) { <<
395 case -EINPROGRESS: <<
396 case -EBUSY: <<
397 wait_for_completion(&wait->com <<
398 reinit_completion(&wait->compl <<
399 err = wait->err; <<
400 break; <<
401 } <<
402 <<
403 return err; <<
404 } <<
405 <<
406 static inline void crypto_init_wait(struct cry <<
407 { <<
408 init_completion(&wait->completion); <<
409 } <<
410 477
411 /* 478 /*
412 * Algorithm query interface. 479 * Algorithm query interface.
413 */ 480 */
414 int crypto_has_alg(const char *name, u32 type, 481 int crypto_has_alg(const char *name, u32 type, u32 mask);
415 482
416 /* 483 /*
417 * Transforms: user-instantiated objects which 484 * Transforms: user-instantiated objects which encapsulate algorithms
418 * and core processing logic. Managed via cry 485 * and core processing logic. Managed via crypto_alloc_*() and
419 * crypto_free_*(), as well as the various hel 486 * crypto_free_*(), as well as the various helpers below.
420 */ 487 */
421 488
>> 489 struct ablkcipher_tfm {
>> 490 int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
>> 491 unsigned int keylen);
>> 492 int (*encrypt)(struct ablkcipher_request *req);
>> 493 int (*decrypt)(struct ablkcipher_request *req);
>> 494
>> 495 struct crypto_ablkcipher *base;
>> 496
>> 497 unsigned int ivsize;
>> 498 unsigned int reqsize;
>> 499 };
>> 500
>> 501 struct blkcipher_tfm {
>> 502 void *iv;
>> 503 int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
>> 504 unsigned int keylen);
>> 505 int (*encrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
>> 506 struct scatterlist *src, unsigned int nbytes);
>> 507 int (*decrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
>> 508 struct scatterlist *src, unsigned int nbytes);
>> 509 };
>> 510
>> 511 struct cipher_tfm {
>> 512 int (*cit_setkey)(struct crypto_tfm *tfm,
>> 513 const u8 *key, unsigned int keylen);
>> 514 void (*cit_encrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
>> 515 void (*cit_decrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
>> 516 };
>> 517
>> 518 struct compress_tfm {
>> 519 int (*cot_compress)(struct crypto_tfm *tfm,
>> 520 const u8 *src, unsigned int slen,
>> 521 u8 *dst, unsigned int *dlen);
>> 522 int (*cot_decompress)(struct crypto_tfm *tfm,
>> 523 const u8 *src, unsigned int slen,
>> 524 u8 *dst, unsigned int *dlen);
>> 525 };
>> 526
>> 527 #define crt_ablkcipher crt_u.ablkcipher
>> 528 #define crt_blkcipher crt_u.blkcipher
>> 529 #define crt_cipher crt_u.cipher
>> 530 #define crt_compress crt_u.compress
>> 531
422 struct crypto_tfm { 532 struct crypto_tfm {
423 refcount_t refcnt; <<
424 533
425 u32 crt_flags; 534 u32 crt_flags;
426 <<
427 int node; <<
428 535
>> 536 union {
>> 537 struct ablkcipher_tfm ablkcipher;
>> 538 struct blkcipher_tfm blkcipher;
>> 539 struct cipher_tfm cipher;
>> 540 struct compress_tfm compress;
>> 541 } crt_u;
>> 542
429 void (*exit)(struct crypto_tfm *tfm); 543 void (*exit)(struct crypto_tfm *tfm);
430 544
431 struct crypto_alg *__crt_alg; 545 struct crypto_alg *__crt_alg;
432 546
433 void *__crt_ctx[] CRYPTO_MINALIGN_ATTR 547 void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
434 }; 548 };
435 549
>> 550 struct crypto_ablkcipher {
>> 551 struct crypto_tfm base;
>> 552 };
>> 553
>> 554 struct crypto_blkcipher {
>> 555 struct crypto_tfm base;
>> 556 };
>> 557
>> 558 struct crypto_cipher {
>> 559 struct crypto_tfm base;
>> 560 };
>> 561
436 struct crypto_comp { 562 struct crypto_comp {
437 struct crypto_tfm base; 563 struct crypto_tfm base;
438 }; 564 };
439 565
>> 566 enum {
>> 567 CRYPTOA_UNSPEC,
>> 568 CRYPTOA_ALG,
>> 569 CRYPTOA_TYPE,
>> 570 CRYPTOA_U32,
>> 571 __CRYPTOA_MAX,
>> 572 };
>> 573
>> 574 #define CRYPTOA_MAX (__CRYPTOA_MAX - 1)
>> 575
>> 576 /* Maximum number of (rtattr) parameters for each template. */
>> 577 #define CRYPTO_MAX_ATTRS 32
>> 578
>> 579 struct crypto_attr_alg {
>> 580 char name[CRYPTO_MAX_ALG_NAME];
>> 581 };
>> 582
>> 583 struct crypto_attr_type {
>> 584 u32 type;
>> 585 u32 mask;
>> 586 };
>> 587
>> 588 struct crypto_attr_u32 {
>> 589 u32 num;
>> 590 };
>> 591
440 /* 592 /*
441 * Transform user interface. 593 * Transform user interface.
442 */ 594 */
443 595
444 struct crypto_tfm *crypto_alloc_base(const cha 596 struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
445 void crypto_destroy_tfm(void *mem, struct cryp 597 void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm);
446 598
447 static inline void crypto_free_tfm(struct cryp 599 static inline void crypto_free_tfm(struct crypto_tfm *tfm)
448 { 600 {
449 return crypto_destroy_tfm(tfm, tfm); 601 return crypto_destroy_tfm(tfm, tfm);
450 } 602 }
451 603
>> 604 int alg_test(const char *driver, const char *alg, u32 type, u32 mask);
>> 605
452 /* 606 /*
453 * Transform helpers which query the underlyin 607 * Transform helpers which query the underlying algorithm.
454 */ 608 */
455 static inline const char *crypto_tfm_alg_name( 609 static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm)
456 { 610 {
457 return tfm->__crt_alg->cra_name; 611 return tfm->__crt_alg->cra_name;
458 } 612 }
459 613
460 static inline const char *crypto_tfm_alg_drive 614 static inline const char *crypto_tfm_alg_driver_name(struct crypto_tfm *tfm)
461 { 615 {
462 return tfm->__crt_alg->cra_driver_name 616 return tfm->__crt_alg->cra_driver_name;
463 } 617 }
464 618
>> 619 static inline int crypto_tfm_alg_priority(struct crypto_tfm *tfm)
>> 620 {
>> 621 return tfm->__crt_alg->cra_priority;
>> 622 }
>> 623
>> 624 static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
>> 625 {
>> 626 return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
>> 627 }
>> 628
465 static inline unsigned int crypto_tfm_alg_bloc 629 static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
466 { 630 {
467 return tfm->__crt_alg->cra_blocksize; 631 return tfm->__crt_alg->cra_blocksize;
468 } 632 }
469 633
470 static inline unsigned int crypto_tfm_alg_alig 634 static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
471 { 635 {
472 return tfm->__crt_alg->cra_alignmask; 636 return tfm->__crt_alg->cra_alignmask;
473 } 637 }
474 638
475 static inline u32 crypto_tfm_get_flags(struct 639 static inline u32 crypto_tfm_get_flags(struct crypto_tfm *tfm)
476 { 640 {
477 return tfm->crt_flags; 641 return tfm->crt_flags;
478 } 642 }
479 643
480 static inline void crypto_tfm_set_flags(struct 644 static inline void crypto_tfm_set_flags(struct crypto_tfm *tfm, u32 flags)
481 { 645 {
482 tfm->crt_flags |= flags; 646 tfm->crt_flags |= flags;
483 } 647 }
484 648
485 static inline void crypto_tfm_clear_flags(stru 649 static inline void crypto_tfm_clear_flags(struct crypto_tfm *tfm, u32 flags)
486 { 650 {
487 tfm->crt_flags &= ~flags; 651 tfm->crt_flags &= ~flags;
488 } 652 }
489 653
>> 654 static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
>> 655 {
>> 656 return tfm->__crt_ctx;
>> 657 }
>> 658
490 static inline unsigned int crypto_tfm_ctx_alig 659 static inline unsigned int crypto_tfm_ctx_alignment(void)
491 { 660 {
492 struct crypto_tfm *tfm; 661 struct crypto_tfm *tfm;
493 return __alignof__(tfm->__crt_ctx); 662 return __alignof__(tfm->__crt_ctx);
494 } 663 }
495 664
>> 665 /*
>> 666 * API wrappers.
>> 667 */
>> 668 static inline struct crypto_ablkcipher *__crypto_ablkcipher_cast(
>> 669 struct crypto_tfm *tfm)
>> 670 {
>> 671 return (struct crypto_ablkcipher *)tfm;
>> 672 }
>> 673
>> 674 static inline u32 crypto_skcipher_type(u32 type)
>> 675 {
>> 676 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
>> 677 type |= CRYPTO_ALG_TYPE_BLKCIPHER;
>> 678 return type;
>> 679 }
>> 680
>> 681 static inline u32 crypto_skcipher_mask(u32 mask)
>> 682 {
>> 683 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
>> 684 mask |= CRYPTO_ALG_TYPE_BLKCIPHER_MASK;
>> 685 return mask;
>> 686 }
>> 687
>> 688 /**
>> 689 * DOC: Asynchronous Block Cipher API
>> 690 *
>> 691 * Asynchronous block cipher API is used with the ciphers of type
>> 692 * CRYPTO_ALG_TYPE_ABLKCIPHER (listed as type "ablkcipher" in /proc/crypto).
>> 693 *
>> 694 * Asynchronous cipher operations imply that the function invocation for a
>> 695 * cipher request returns immediately before the completion of the operation.
>> 696 * The cipher request is scheduled as a separate kernel thread and therefore
>> 697 * load-balanced on the different CPUs via the process scheduler. To allow
>> 698 * the kernel crypto API to inform the caller about the completion of a cipher
>> 699 * request, the caller must provide a callback function. That function is
>> 700 * invoked with the cipher handle when the request completes.
>> 701 *
>> 702 * To support the asynchronous operation, additional information than just the
>> 703 * cipher handle must be supplied to the kernel crypto API. That additional
>> 704 * information is given by filling in the ablkcipher_request data structure.
>> 705 *
>> 706 * For the asynchronous block cipher API, the state is maintained with the tfm
>> 707 * cipher handle. A single tfm can be used across multiple calls and in
>> 708 * parallel. For asynchronous block cipher calls, context data supplied and
>> 709 * only used by the caller can be referenced the request data structure in
>> 710 * addition to the IV used for the cipher request. The maintenance of such
>> 711 * state information would be important for a crypto driver implementer to
>> 712 * have, because when calling the callback function upon completion of the
>> 713 * cipher operation, that callback function may need some information about
>> 714 * which operation just finished if it invoked multiple in parallel. This
>> 715 * state information is unused by the kernel crypto API.
>> 716 */
>> 717
>> 718 static inline struct crypto_tfm *crypto_ablkcipher_tfm(
>> 719 struct crypto_ablkcipher *tfm)
>> 720 {
>> 721 return &tfm->base;
>> 722 }
>> 723
>> 724 /**
>> 725 * crypto_free_ablkcipher() - zeroize and free cipher handle
>> 726 * @tfm: cipher handle to be freed
>> 727 */
>> 728 static inline void crypto_free_ablkcipher(struct crypto_ablkcipher *tfm)
>> 729 {
>> 730 crypto_free_tfm(crypto_ablkcipher_tfm(tfm));
>> 731 }
>> 732
>> 733 /**
>> 734 * crypto_has_ablkcipher() - Search for the availability of an ablkcipher.
>> 735 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
>> 736 * ablkcipher
>> 737 * @type: specifies the type of the cipher
>> 738 * @mask: specifies the mask for the cipher
>> 739 *
>> 740 * Return: true when the ablkcipher is known to the kernel crypto API; false
>> 741 * otherwise
>> 742 */
>> 743 static inline int crypto_has_ablkcipher(const char *alg_name, u32 type,
>> 744 u32 mask)
>> 745 {
>> 746 return crypto_has_alg(alg_name, crypto_skcipher_type(type),
>> 747 crypto_skcipher_mask(mask));
>> 748 }
>> 749
>> 750 static inline struct ablkcipher_tfm *crypto_ablkcipher_crt(
>> 751 struct crypto_ablkcipher *tfm)
>> 752 {
>> 753 return &crypto_ablkcipher_tfm(tfm)->crt_ablkcipher;
>> 754 }
>> 755
>> 756 /**
>> 757 * crypto_ablkcipher_ivsize() - obtain IV size
>> 758 * @tfm: cipher handle
>> 759 *
>> 760 * The size of the IV for the ablkcipher referenced by the cipher handle is
>> 761 * returned. This IV size may be zero if the cipher does not need an IV.
>> 762 *
>> 763 * Return: IV size in bytes
>> 764 */
>> 765 static inline unsigned int crypto_ablkcipher_ivsize(
>> 766 struct crypto_ablkcipher *tfm)
>> 767 {
>> 768 return crypto_ablkcipher_crt(tfm)->ivsize;
>> 769 }
>> 770
>> 771 /**
>> 772 * crypto_ablkcipher_blocksize() - obtain block size of cipher
>> 773 * @tfm: cipher handle
>> 774 *
>> 775 * The block size for the ablkcipher referenced with the cipher handle is
>> 776 * returned. The caller may use that information to allocate appropriate
>> 777 * memory for the data returned by the encryption or decryption operation
>> 778 *
>> 779 * Return: block size of cipher
>> 780 */
>> 781 static inline unsigned int crypto_ablkcipher_blocksize(
>> 782 struct crypto_ablkcipher *tfm)
>> 783 {
>> 784 return crypto_tfm_alg_blocksize(crypto_ablkcipher_tfm(tfm));
>> 785 }
>> 786
>> 787 static inline unsigned int crypto_ablkcipher_alignmask(
>> 788 struct crypto_ablkcipher *tfm)
>> 789 {
>> 790 return crypto_tfm_alg_alignmask(crypto_ablkcipher_tfm(tfm));
>> 791 }
>> 792
>> 793 static inline u32 crypto_ablkcipher_get_flags(struct crypto_ablkcipher *tfm)
>> 794 {
>> 795 return crypto_tfm_get_flags(crypto_ablkcipher_tfm(tfm));
>> 796 }
>> 797
>> 798 static inline void crypto_ablkcipher_set_flags(struct crypto_ablkcipher *tfm,
>> 799 u32 flags)
>> 800 {
>> 801 crypto_tfm_set_flags(crypto_ablkcipher_tfm(tfm), flags);
>> 802 }
>> 803
>> 804 static inline void crypto_ablkcipher_clear_flags(struct crypto_ablkcipher *tfm,
>> 805 u32 flags)
>> 806 {
>> 807 crypto_tfm_clear_flags(crypto_ablkcipher_tfm(tfm), flags);
>> 808 }
>> 809
>> 810 /**
>> 811 * crypto_ablkcipher_setkey() - set key for cipher
>> 812 * @tfm: cipher handle
>> 813 * @key: buffer holding the key
>> 814 * @keylen: length of the key in bytes
>> 815 *
>> 816 * The caller provided key is set for the ablkcipher referenced by the cipher
>> 817 * handle.
>> 818 *
>> 819 * Note, the key length determines the cipher type. Many block ciphers implement
>> 820 * different cipher modes depending on the key size, such as AES-128 vs AES-192
>> 821 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
>> 822 * is performed.
>> 823 *
>> 824 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
>> 825 */
>> 826 static inline int crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm,
>> 827 const u8 *key, unsigned int keylen)
>> 828 {
>> 829 struct ablkcipher_tfm *crt = crypto_ablkcipher_crt(tfm);
>> 830
>> 831 return crt->setkey(crt->base, key, keylen);
>> 832 }
>> 833
>> 834 /**
>> 835 * crypto_ablkcipher_reqtfm() - obtain cipher handle from request
>> 836 * @req: ablkcipher_request out of which the cipher handle is to be obtained
>> 837 *
>> 838 * Return the crypto_ablkcipher handle when furnishing an ablkcipher_request
>> 839 * data structure.
>> 840 *
>> 841 * Return: crypto_ablkcipher handle
>> 842 */
>> 843 static inline struct crypto_ablkcipher *crypto_ablkcipher_reqtfm(
>> 844 struct ablkcipher_request *req)
>> 845 {
>> 846 return __crypto_ablkcipher_cast(req->base.tfm);
>> 847 }
>> 848
>> 849 /**
>> 850 * crypto_ablkcipher_encrypt() - encrypt plaintext
>> 851 * @req: reference to the ablkcipher_request handle that holds all information
>> 852 * needed to perform the cipher operation
>> 853 *
>> 854 * Encrypt plaintext data using the ablkcipher_request handle. That data
>> 855 * structure and how it is filled with data is discussed with the
>> 856 * ablkcipher_request_* functions.
>> 857 *
>> 858 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
>> 859 */
>> 860 static inline int crypto_ablkcipher_encrypt(struct ablkcipher_request *req)
>> 861 {
>> 862 struct ablkcipher_tfm *crt =
>> 863 crypto_ablkcipher_crt(crypto_ablkcipher_reqtfm(req));
>> 864 return crt->encrypt(req);
>> 865 }
>> 866
>> 867 /**
>> 868 * crypto_ablkcipher_decrypt() - decrypt ciphertext
>> 869 * @req: reference to the ablkcipher_request handle that holds all information
>> 870 * needed to perform the cipher operation
>> 871 *
>> 872 * Decrypt ciphertext data using the ablkcipher_request handle. That data
>> 873 * structure and how it is filled with data is discussed with the
>> 874 * ablkcipher_request_* functions.
>> 875 *
>> 876 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
>> 877 */
>> 878 static inline int crypto_ablkcipher_decrypt(struct ablkcipher_request *req)
>> 879 {
>> 880 struct ablkcipher_tfm *crt =
>> 881 crypto_ablkcipher_crt(crypto_ablkcipher_reqtfm(req));
>> 882 return crt->decrypt(req);
>> 883 }
>> 884
>> 885 /**
>> 886 * DOC: Asynchronous Cipher Request Handle
>> 887 *
>> 888 * The ablkcipher_request data structure contains all pointers to data
>> 889 * required for the asynchronous cipher operation. This includes the cipher
>> 890 * handle (which can be used by multiple ablkcipher_request instances), pointer
>> 891 * to plaintext and ciphertext, asynchronous callback function, etc. It acts
>> 892 * as a handle to the ablkcipher_request_* API calls in a similar way as
>> 893 * ablkcipher handle to the crypto_ablkcipher_* API calls.
>> 894 */
>> 895
>> 896 /**
>> 897 * crypto_ablkcipher_reqsize() - obtain size of the request data structure
>> 898 * @tfm: cipher handle
>> 899 *
>> 900 * Return: number of bytes
>> 901 */
>> 902 static inline unsigned int crypto_ablkcipher_reqsize(
>> 903 struct crypto_ablkcipher *tfm)
>> 904 {
>> 905 return crypto_ablkcipher_crt(tfm)->reqsize;
>> 906 }
>> 907
>> 908 /**
>> 909 * ablkcipher_request_set_tfm() - update cipher handle reference in request
>> 910 * @req: request handle to be modified
>> 911 * @tfm: cipher handle that shall be added to the request handle
>> 912 *
>> 913 * Allow the caller to replace the existing ablkcipher handle in the request
>> 914 * data structure with a different one.
>> 915 */
>> 916 static inline void ablkcipher_request_set_tfm(
>> 917 struct ablkcipher_request *req, struct crypto_ablkcipher *tfm)
>> 918 {
>> 919 req->base.tfm = crypto_ablkcipher_tfm(crypto_ablkcipher_crt(tfm)->base);
>> 920 }
>> 921
>> 922 static inline struct ablkcipher_request *ablkcipher_request_cast(
>> 923 struct crypto_async_request *req)
>> 924 {
>> 925 return container_of(req, struct ablkcipher_request, base);
>> 926 }
>> 927
>> 928 /**
>> 929 * ablkcipher_request_alloc() - allocate request data structure
>> 930 * @tfm: cipher handle to be registered with the request
>> 931 * @gfp: memory allocation flag that is handed to kmalloc by the API call.
>> 932 *
>> 933 * Allocate the request data structure that must be used with the ablkcipher
>> 934 * encrypt and decrypt API calls. During the allocation, the provided ablkcipher
>> 935 * handle is registered in the request data structure.
>> 936 *
>> 937 * Return: allocated request handle in case of success, or NULL if out of memory
>> 938 */
>> 939 static inline struct ablkcipher_request *ablkcipher_request_alloc(
>> 940 struct crypto_ablkcipher *tfm, gfp_t gfp)
>> 941 {
>> 942 struct ablkcipher_request *req;
>> 943
>> 944 req = kmalloc(sizeof(struct ablkcipher_request) +
>> 945 crypto_ablkcipher_reqsize(tfm), gfp);
>> 946
>> 947 if (likely(req))
>> 948 ablkcipher_request_set_tfm(req, tfm);
>> 949
>> 950 return req;
>> 951 }
>> 952
>> 953 /**
>> 954 * ablkcipher_request_free() - zeroize and free request data structure
>> 955 * @req: request data structure cipher handle to be freed
>> 956 */
>> 957 static inline void ablkcipher_request_free(struct ablkcipher_request *req)
>> 958 {
>> 959 kzfree(req);
>> 960 }
>> 961
>> 962 /**
>> 963 * ablkcipher_request_set_callback() - set asynchronous callback function
>> 964 * @req: request handle
>> 965 * @flags: specify zero or an ORing of the flags
>> 966 * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and
>> 967 * increase the wait queue beyond the initial maximum size;
>> 968 * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep
>> 969 * @compl: callback function pointer to be registered with the request handle
>> 970 * @data: The data pointer refers to memory that is not used by the kernel
>> 971 * crypto API, but provided to the callback function for it to use. Here,
>> 972 * the caller can provide a reference to memory the callback function can
>> 973 * operate on. As the callback function is invoked asynchronously to the
>> 974 * related functionality, it may need to access data structures of the
>> 975 * related functionality which can be referenced using this pointer. The
>> 976 * callback function can access the memory via the "data" field in the
>> 977 * crypto_async_request data structure provided to the callback function.
>> 978 *
>> 979 * This function allows setting the callback function that is triggered once the
>> 980 * cipher operation completes.
>> 981 *
>> 982 * The callback function is registered with the ablkcipher_request handle and
>> 983 * must comply with the following template::
>> 984 *
>> 985 * void callback_function(struct crypto_async_request *req, int error)
>> 986 */
>> 987 static inline void ablkcipher_request_set_callback(
>> 988 struct ablkcipher_request *req,
>> 989 u32 flags, crypto_completion_t compl, void *data)
>> 990 {
>> 991 req->base.complete = compl;
>> 992 req->base.data = data;
>> 993 req->base.flags = flags;
>> 994 }
>> 995
>> 996 /**
>> 997 * ablkcipher_request_set_crypt() - set data buffers
>> 998 * @req: request handle
>> 999 * @src: source scatter / gather list
>> 1000 * @dst: destination scatter / gather list
>> 1001 * @nbytes: number of bytes to process from @src
>> 1002 * @iv: IV for the cipher operation which must comply with the IV size defined
>> 1003 * by crypto_ablkcipher_ivsize
>> 1004 *
>> 1005 * This function allows setting of the source data and destination data
>> 1006 * scatter / gather lists.
>> 1007 *
>> 1008 * For encryption, the source is treated as the plaintext and the
>> 1009 * destination is the ciphertext. For a decryption operation, the use is
>> 1010 * reversed - the source is the ciphertext and the destination is the plaintext.
>> 1011 */
>> 1012 static inline void ablkcipher_request_set_crypt(
>> 1013 struct ablkcipher_request *req,
>> 1014 struct scatterlist *src, struct scatterlist *dst,
>> 1015 unsigned int nbytes, void *iv)
>> 1016 {
>> 1017 req->src = src;
>> 1018 req->dst = dst;
>> 1019 req->nbytes = nbytes;
>> 1020 req->info = iv;
>> 1021 }
>> 1022
>> 1023 /**
>> 1024 * DOC: Synchronous Block Cipher API
>> 1025 *
>> 1026 * The synchronous block cipher API is used with the ciphers of type
>> 1027 * CRYPTO_ALG_TYPE_BLKCIPHER (listed as type "blkcipher" in /proc/crypto)
>> 1028 *
>> 1029 * Synchronous calls, have a context in the tfm. But since a single tfm can be
>> 1030 * used in multiple calls and in parallel, this info should not be changeable
>> 1031 * (unless a lock is used). This applies, for example, to the symmetric key.
>> 1032 * However, the IV is changeable, so there is an iv field in blkcipher_tfm
>> 1033 * structure for synchronous blkcipher api. So, its the only state info that can
>> 1034 * be kept for synchronous calls without using a big lock across a tfm.
>> 1035 *
>> 1036 * The block cipher API allows the use of a complete cipher, i.e. a cipher
>> 1037 * consisting of a template (a block chaining mode) and a single block cipher
>> 1038 * primitive (e.g. AES).
>> 1039 *
>> 1040 * The plaintext data buffer and the ciphertext data buffer are pointed to
>> 1041 * by using scatter/gather lists. The cipher operation is performed
>> 1042 * on all segments of the provided scatter/gather lists.
>> 1043 *
>> 1044 * The kernel crypto API supports a cipher operation "in-place" which means that
>> 1045 * the caller may provide the same scatter/gather list for the plaintext and
>> 1046 * cipher text. After the completion of the cipher operation, the plaintext
>> 1047 * data is replaced with the ciphertext data in case of an encryption and vice
>> 1048 * versa for a decryption. The caller must ensure that the scatter/gather lists
>> 1049 * for the output data point to sufficiently large buffers, i.e. multiples of
>> 1050 * the block size of the cipher.
>> 1051 */
>> 1052
>> 1053 static inline struct crypto_blkcipher *__crypto_blkcipher_cast(
>> 1054 struct crypto_tfm *tfm)
>> 1055 {
>> 1056 return (struct crypto_blkcipher *)tfm;
>> 1057 }
>> 1058
>> 1059 static inline struct crypto_blkcipher *crypto_blkcipher_cast(
>> 1060 struct crypto_tfm *tfm)
>> 1061 {
>> 1062 BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_BLKCIPHER);
>> 1063 return __crypto_blkcipher_cast(tfm);
>> 1064 }
>> 1065
>> 1066 /**
>> 1067 * crypto_alloc_blkcipher() - allocate synchronous block cipher handle
>> 1068 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
>> 1069 * blkcipher cipher
>> 1070 * @type: specifies the type of the cipher
>> 1071 * @mask: specifies the mask for the cipher
>> 1072 *
>> 1073 * Allocate a cipher handle for a block cipher. The returned struct
>> 1074 * crypto_blkcipher is the cipher handle that is required for any subsequent
>> 1075 * API invocation for that block cipher.
>> 1076 *
>> 1077 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
>> 1078 * of an error, PTR_ERR() returns the error code.
>> 1079 */
>> 1080 static inline struct crypto_blkcipher *crypto_alloc_blkcipher(
>> 1081 const char *alg_name, u32 type, u32 mask)
>> 1082 {
>> 1083 type &= ~CRYPTO_ALG_TYPE_MASK;
>> 1084 type |= CRYPTO_ALG_TYPE_BLKCIPHER;
>> 1085 mask |= CRYPTO_ALG_TYPE_MASK;
>> 1086
>> 1087 return __crypto_blkcipher_cast(crypto_alloc_base(alg_name, type, mask));
>> 1088 }
>> 1089
>> 1090 static inline struct crypto_tfm *crypto_blkcipher_tfm(
>> 1091 struct crypto_blkcipher *tfm)
>> 1092 {
>> 1093 return &tfm->base;
>> 1094 }
>> 1095
>> 1096 /**
>> 1097 * crypto_free_blkcipher() - zeroize and free the block cipher handle
>> 1098 * @tfm: cipher handle to be freed
>> 1099 */
>> 1100 static inline void crypto_free_blkcipher(struct crypto_blkcipher *tfm)
>> 1101 {
>> 1102 crypto_free_tfm(crypto_blkcipher_tfm(tfm));
>> 1103 }
>> 1104
>> 1105 /**
>> 1106 * crypto_has_blkcipher() - Search for the availability of a block cipher
>> 1107 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
>> 1108 * block cipher
>> 1109 * @type: specifies the type of the cipher
>> 1110 * @mask: specifies the mask for the cipher
>> 1111 *
>> 1112 * Return: true when the block cipher is known to the kernel crypto API; false
>> 1113 * otherwise
>> 1114 */
>> 1115 static inline int crypto_has_blkcipher(const char *alg_name, u32 type, u32 mask)
>> 1116 {
>> 1117 type &= ~CRYPTO_ALG_TYPE_MASK;
>> 1118 type |= CRYPTO_ALG_TYPE_BLKCIPHER;
>> 1119 mask |= CRYPTO_ALG_TYPE_MASK;
>> 1120
>> 1121 return crypto_has_alg(alg_name, type, mask);
>> 1122 }
>> 1123
>> 1124 /**
>> 1125 * crypto_blkcipher_name() - return the name / cra_name from the cipher handle
>> 1126 * @tfm: cipher handle
>> 1127 *
>> 1128 * Return: The character string holding the name of the cipher
>> 1129 */
>> 1130 static inline const char *crypto_blkcipher_name(struct crypto_blkcipher *tfm)
>> 1131 {
>> 1132 return crypto_tfm_alg_name(crypto_blkcipher_tfm(tfm));
>> 1133 }
>> 1134
>> 1135 static inline struct blkcipher_tfm *crypto_blkcipher_crt(
>> 1136 struct crypto_blkcipher *tfm)
>> 1137 {
>> 1138 return &crypto_blkcipher_tfm(tfm)->crt_blkcipher;
>> 1139 }
>> 1140
>> 1141 static inline struct blkcipher_alg *crypto_blkcipher_alg(
>> 1142 struct crypto_blkcipher *tfm)
>> 1143 {
>> 1144 return &crypto_blkcipher_tfm(tfm)->__crt_alg->cra_blkcipher;
>> 1145 }
>> 1146
>> 1147 /**
>> 1148 * crypto_blkcipher_ivsize() - obtain IV size
>> 1149 * @tfm: cipher handle
>> 1150 *
>> 1151 * The size of the IV for the block cipher referenced by the cipher handle is
>> 1152 * returned. This IV size may be zero if the cipher does not need an IV.
>> 1153 *
>> 1154 * Return: IV size in bytes
>> 1155 */
>> 1156 static inline unsigned int crypto_blkcipher_ivsize(struct crypto_blkcipher *tfm)
>> 1157 {
>> 1158 return crypto_blkcipher_alg(tfm)->ivsize;
>> 1159 }
>> 1160
>> 1161 /**
>> 1162 * crypto_blkcipher_blocksize() - obtain block size of cipher
>> 1163 * @tfm: cipher handle
>> 1164 *
>> 1165 * The block size for the block cipher referenced with the cipher handle is
>> 1166 * returned. The caller may use that information to allocate appropriate
>> 1167 * memory for the data returned by the encryption or decryption operation.
>> 1168 *
>> 1169 * Return: block size of cipher
>> 1170 */
>> 1171 static inline unsigned int crypto_blkcipher_blocksize(
>> 1172 struct crypto_blkcipher *tfm)
>> 1173 {
>> 1174 return crypto_tfm_alg_blocksize(crypto_blkcipher_tfm(tfm));
>> 1175 }
>> 1176
>> 1177 static inline unsigned int crypto_blkcipher_alignmask(
>> 1178 struct crypto_blkcipher *tfm)
>> 1179 {
>> 1180 return crypto_tfm_alg_alignmask(crypto_blkcipher_tfm(tfm));
>> 1181 }
>> 1182
>> 1183 static inline u32 crypto_blkcipher_get_flags(struct crypto_blkcipher *tfm)
>> 1184 {
>> 1185 return crypto_tfm_get_flags(crypto_blkcipher_tfm(tfm));
>> 1186 }
>> 1187
>> 1188 static inline void crypto_blkcipher_set_flags(struct crypto_blkcipher *tfm,
>> 1189 u32 flags)
>> 1190 {
>> 1191 crypto_tfm_set_flags(crypto_blkcipher_tfm(tfm), flags);
>> 1192 }
>> 1193
>> 1194 static inline void crypto_blkcipher_clear_flags(struct crypto_blkcipher *tfm,
>> 1195 u32 flags)
>> 1196 {
>> 1197 crypto_tfm_clear_flags(crypto_blkcipher_tfm(tfm), flags);
>> 1198 }
>> 1199
>> 1200 /**
>> 1201 * crypto_blkcipher_setkey() - set key for cipher
>> 1202 * @tfm: cipher handle
>> 1203 * @key: buffer holding the key
>> 1204 * @keylen: length of the key in bytes
>> 1205 *
>> 1206 * The caller provided key is set for the block cipher referenced by the cipher
>> 1207 * handle.
>> 1208 *
>> 1209 * Note, the key length determines the cipher type. Many block ciphers implement
>> 1210 * different cipher modes depending on the key size, such as AES-128 vs AES-192
>> 1211 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
>> 1212 * is performed.
>> 1213 *
>> 1214 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
>> 1215 */
>> 1216 static inline int crypto_blkcipher_setkey(struct crypto_blkcipher *tfm,
>> 1217 const u8 *key, unsigned int keylen)
>> 1218 {
>> 1219 return crypto_blkcipher_crt(tfm)->setkey(crypto_blkcipher_tfm(tfm),
>> 1220 key, keylen);
>> 1221 }
>> 1222
>> 1223 /**
>> 1224 * crypto_blkcipher_encrypt() - encrypt plaintext
>> 1225 * @desc: reference to the block cipher handle with meta data
>> 1226 * @dst: scatter/gather list that is filled by the cipher operation with the
>> 1227 * ciphertext
>> 1228 * @src: scatter/gather list that holds the plaintext
>> 1229 * @nbytes: number of bytes of the plaintext to encrypt.
>> 1230 *
>> 1231 * Encrypt plaintext data using the IV set by the caller with a preceding
>> 1232 * call of crypto_blkcipher_set_iv.
>> 1233 *
>> 1234 * The blkcipher_desc data structure must be filled by the caller and can
>> 1235 * reside on the stack. The caller must fill desc as follows: desc.tfm is filled
>> 1236 * with the block cipher handle; desc.flags is filled with either
>> 1237 * CRYPTO_TFM_REQ_MAY_SLEEP or 0.
>> 1238 *
>> 1239 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
>> 1240 */
>> 1241 static inline int crypto_blkcipher_encrypt(struct blkcipher_desc *desc,
>> 1242 struct scatterlist *dst,
>> 1243 struct scatterlist *src,
>> 1244 unsigned int nbytes)
>> 1245 {
>> 1246 desc->info = crypto_blkcipher_crt(desc->tfm)->iv;
>> 1247 return crypto_blkcipher_crt(desc->tfm)->encrypt(desc, dst, src, nbytes);
>> 1248 }
>> 1249
>> 1250 /**
>> 1251 * crypto_blkcipher_encrypt_iv() - encrypt plaintext with dedicated IV
>> 1252 * @desc: reference to the block cipher handle with meta data
>> 1253 * @dst: scatter/gather list that is filled by the cipher operation with the
>> 1254 * ciphertext
>> 1255 * @src: scatter/gather list that holds the plaintext
>> 1256 * @nbytes: number of bytes of the plaintext to encrypt.
>> 1257 *
>> 1258 * Encrypt plaintext data with the use of an IV that is solely used for this
>> 1259 * cipher operation. Any previously set IV is not used.
>> 1260 *
>> 1261 * The blkcipher_desc data structure must be filled by the caller and can
>> 1262 * reside on the stack. The caller must fill desc as follows: desc.tfm is filled
>> 1263 * with the block cipher handle; desc.info is filled with the IV to be used for
>> 1264 * the current operation; desc.flags is filled with either
>> 1265 * CRYPTO_TFM_REQ_MAY_SLEEP or 0.
>> 1266 *
>> 1267 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
>> 1268 */
>> 1269 static inline int crypto_blkcipher_encrypt_iv(struct blkcipher_desc *desc,
>> 1270 struct scatterlist *dst,
>> 1271 struct scatterlist *src,
>> 1272 unsigned int nbytes)
>> 1273 {
>> 1274 return crypto_blkcipher_crt(desc->tfm)->encrypt(desc, dst, src, nbytes);
>> 1275 }
>> 1276
>> 1277 /**
>> 1278 * crypto_blkcipher_decrypt() - decrypt ciphertext
>> 1279 * @desc: reference to the block cipher handle with meta data
>> 1280 * @dst: scatter/gather list that is filled by the cipher operation with the
>> 1281 * plaintext
>> 1282 * @src: scatter/gather list that holds the ciphertext
>> 1283 * @nbytes: number of bytes of the ciphertext to decrypt.
>> 1284 *
>> 1285 * Decrypt ciphertext data using the IV set by the caller with a preceding
>> 1286 * call of crypto_blkcipher_set_iv.
>> 1287 *
>> 1288 * The blkcipher_desc data structure must be filled by the caller as documented
>> 1289 * for the crypto_blkcipher_encrypt call above.
>> 1290 *
>> 1291 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
>> 1292 *
>> 1293 */
>> 1294 static inline int crypto_blkcipher_decrypt(struct blkcipher_desc *desc,
>> 1295 struct scatterlist *dst,
>> 1296 struct scatterlist *src,
>> 1297 unsigned int nbytes)
>> 1298 {
>> 1299 desc->info = crypto_blkcipher_crt(desc->tfm)->iv;
>> 1300 return crypto_blkcipher_crt(desc->tfm)->decrypt(desc, dst, src, nbytes);
>> 1301 }
>> 1302
>> 1303 /**
>> 1304 * crypto_blkcipher_decrypt_iv() - decrypt ciphertext with dedicated IV
>> 1305 * @desc: reference to the block cipher handle with meta data
>> 1306 * @dst: scatter/gather list that is filled by the cipher operation with the
>> 1307 * plaintext
>> 1308 * @src: scatter/gather list that holds the ciphertext
>> 1309 * @nbytes: number of bytes of the ciphertext to decrypt.
>> 1310 *
>> 1311 * Decrypt ciphertext data with the use of an IV that is solely used for this
>> 1312 * cipher operation. Any previously set IV is not used.
>> 1313 *
>> 1314 * The blkcipher_desc data structure must be filled by the caller as documented
>> 1315 * for the crypto_blkcipher_encrypt_iv call above.
>> 1316 *
>> 1317 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
>> 1318 */
>> 1319 static inline int crypto_blkcipher_decrypt_iv(struct blkcipher_desc *desc,
>> 1320 struct scatterlist *dst,
>> 1321 struct scatterlist *src,
>> 1322 unsigned int nbytes)
>> 1323 {
>> 1324 return crypto_blkcipher_crt(desc->tfm)->decrypt(desc, dst, src, nbytes);
>> 1325 }
>> 1326
>> 1327 /**
>> 1328 * crypto_blkcipher_set_iv() - set IV for cipher
>> 1329 * @tfm: cipher handle
>> 1330 * @src: buffer holding the IV
>> 1331 * @len: length of the IV in bytes
>> 1332 *
>> 1333 * The caller provided IV is set for the block cipher referenced by the cipher
>> 1334 * handle.
>> 1335 */
>> 1336 static inline void crypto_blkcipher_set_iv(struct crypto_blkcipher *tfm,
>> 1337 const u8 *src, unsigned int len)
>> 1338 {
>> 1339 memcpy(crypto_blkcipher_crt(tfm)->iv, src, len);
>> 1340 }
>> 1341
>> 1342 /**
>> 1343 * crypto_blkcipher_get_iv() - obtain IV from cipher
>> 1344 * @tfm: cipher handle
>> 1345 * @dst: buffer filled with the IV
>> 1346 * @len: length of the buffer dst
>> 1347 *
>> 1348 * The caller can obtain the IV set for the block cipher referenced by the
>> 1349 * cipher handle and store it into the user-provided buffer. If the buffer
>> 1350 * has an insufficient space, the IV is truncated to fit the buffer.
>> 1351 */
>> 1352 static inline void crypto_blkcipher_get_iv(struct crypto_blkcipher *tfm,
>> 1353 u8 *dst, unsigned int len)
>> 1354 {
>> 1355 memcpy(dst, crypto_blkcipher_crt(tfm)->iv, len);
>> 1356 }
>> 1357
>> 1358 /**
>> 1359 * DOC: Single Block Cipher API
>> 1360 *
>> 1361 * The single block cipher API is used with the ciphers of type
>> 1362 * CRYPTO_ALG_TYPE_CIPHER (listed as type "cipher" in /proc/crypto).
>> 1363 *
>> 1364 * Using the single block cipher API calls, operations with the basic cipher
>> 1365 * primitive can be implemented. These cipher primitives exclude any block
>> 1366 * chaining operations including IV handling.
>> 1367 *
>> 1368 * The purpose of this single block cipher API is to support the implementation
>> 1369 * of templates or other concepts that only need to perform the cipher operation
>> 1370 * on one block at a time. Templates invoke the underlying cipher primitive
>> 1371 * block-wise and process either the input or the output data of these cipher
>> 1372 * operations.
>> 1373 */
>> 1374
>> 1375 static inline struct crypto_cipher *__crypto_cipher_cast(struct crypto_tfm *tfm)
>> 1376 {
>> 1377 return (struct crypto_cipher *)tfm;
>> 1378 }
>> 1379
>> 1380 static inline struct crypto_cipher *crypto_cipher_cast(struct crypto_tfm *tfm)
>> 1381 {
>> 1382 BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
>> 1383 return __crypto_cipher_cast(tfm);
>> 1384 }
>> 1385
>> 1386 /**
>> 1387 * crypto_alloc_cipher() - allocate single block cipher handle
>> 1388 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
>> 1389 * single block cipher
>> 1390 * @type: specifies the type of the cipher
>> 1391 * @mask: specifies the mask for the cipher
>> 1392 *
>> 1393 * Allocate a cipher handle for a single block cipher. The returned struct
>> 1394 * crypto_cipher is the cipher handle that is required for any subsequent API
>> 1395 * invocation for that single block cipher.
>> 1396 *
>> 1397 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
>> 1398 * of an error, PTR_ERR() returns the error code.
>> 1399 */
>> 1400 static inline struct crypto_cipher *crypto_alloc_cipher(const char *alg_name,
>> 1401 u32 type, u32 mask)
>> 1402 {
>> 1403 type &= ~CRYPTO_ALG_TYPE_MASK;
>> 1404 type |= CRYPTO_ALG_TYPE_CIPHER;
>> 1405 mask |= CRYPTO_ALG_TYPE_MASK;
>> 1406
>> 1407 return __crypto_cipher_cast(crypto_alloc_base(alg_name, type, mask));
>> 1408 }
>> 1409
>> 1410 static inline struct crypto_tfm *crypto_cipher_tfm(struct crypto_cipher *tfm)
>> 1411 {
>> 1412 return &tfm->base;
>> 1413 }
>> 1414
>> 1415 /**
>> 1416 * crypto_free_cipher() - zeroize and free the single block cipher handle
>> 1417 * @tfm: cipher handle to be freed
>> 1418 */
>> 1419 static inline void crypto_free_cipher(struct crypto_cipher *tfm)
>> 1420 {
>> 1421 crypto_free_tfm(crypto_cipher_tfm(tfm));
>> 1422 }
>> 1423
>> 1424 /**
>> 1425 * crypto_has_cipher() - Search for the availability of a single block cipher
>> 1426 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
>> 1427 * single block cipher
>> 1428 * @type: specifies the type of the cipher
>> 1429 * @mask: specifies the mask for the cipher
>> 1430 *
>> 1431 * Return: true when the single block cipher is known to the kernel crypto API;
>> 1432 * false otherwise
>> 1433 */
>> 1434 static inline int crypto_has_cipher(const char *alg_name, u32 type, u32 mask)
>> 1435 {
>> 1436 type &= ~CRYPTO_ALG_TYPE_MASK;
>> 1437 type |= CRYPTO_ALG_TYPE_CIPHER;
>> 1438 mask |= CRYPTO_ALG_TYPE_MASK;
>> 1439
>> 1440 return crypto_has_alg(alg_name, type, mask);
>> 1441 }
>> 1442
>> 1443 static inline struct cipher_tfm *crypto_cipher_crt(struct crypto_cipher *tfm)
>> 1444 {
>> 1445 return &crypto_cipher_tfm(tfm)->crt_cipher;
>> 1446 }
>> 1447
>> 1448 /**
>> 1449 * crypto_cipher_blocksize() - obtain block size for cipher
>> 1450 * @tfm: cipher handle
>> 1451 *
>> 1452 * The block size for the single block cipher referenced with the cipher handle
>> 1453 * tfm is returned. The caller may use that information to allocate appropriate
>> 1454 * memory for the data returned by the encryption or decryption operation
>> 1455 *
>> 1456 * Return: block size of cipher
>> 1457 */
>> 1458 static inline unsigned int crypto_cipher_blocksize(struct crypto_cipher *tfm)
>> 1459 {
>> 1460 return crypto_tfm_alg_blocksize(crypto_cipher_tfm(tfm));
>> 1461 }
>> 1462
>> 1463 static inline unsigned int crypto_cipher_alignmask(struct crypto_cipher *tfm)
>> 1464 {
>> 1465 return crypto_tfm_alg_alignmask(crypto_cipher_tfm(tfm));
>> 1466 }
>> 1467
>> 1468 static inline u32 crypto_cipher_get_flags(struct crypto_cipher *tfm)
>> 1469 {
>> 1470 return crypto_tfm_get_flags(crypto_cipher_tfm(tfm));
>> 1471 }
>> 1472
>> 1473 static inline void crypto_cipher_set_flags(struct crypto_cipher *tfm,
>> 1474 u32 flags)
>> 1475 {
>> 1476 crypto_tfm_set_flags(crypto_cipher_tfm(tfm), flags);
>> 1477 }
>> 1478
>> 1479 static inline void crypto_cipher_clear_flags(struct crypto_cipher *tfm,
>> 1480 u32 flags)
>> 1481 {
>> 1482 crypto_tfm_clear_flags(crypto_cipher_tfm(tfm), flags);
>> 1483 }
>> 1484
>> 1485 /**
>> 1486 * crypto_cipher_setkey() - set key for cipher
>> 1487 * @tfm: cipher handle
>> 1488 * @key: buffer holding the key
>> 1489 * @keylen: length of the key in bytes
>> 1490 *
>> 1491 * The caller provided key is set for the single block cipher referenced by the
>> 1492 * cipher handle.
>> 1493 *
>> 1494 * Note, the key length determines the cipher type. Many block ciphers implement
>> 1495 * different cipher modes depending on the key size, such as AES-128 vs AES-192
>> 1496 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
>> 1497 * is performed.
>> 1498 *
>> 1499 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
>> 1500 */
>> 1501 static inline int crypto_cipher_setkey(struct crypto_cipher *tfm,
>> 1502 const u8 *key, unsigned int keylen)
>> 1503 {
>> 1504 return crypto_cipher_crt(tfm)->cit_setkey(crypto_cipher_tfm(tfm),
>> 1505 key, keylen);
>> 1506 }
>> 1507
>> 1508 /**
>> 1509 * crypto_cipher_encrypt_one() - encrypt one block of plaintext
>> 1510 * @tfm: cipher handle
>> 1511 * @dst: points to the buffer that will be filled with the ciphertext
>> 1512 * @src: buffer holding the plaintext to be encrypted
>> 1513 *
>> 1514 * Invoke the encryption operation of one block. The caller must ensure that
>> 1515 * the plaintext and ciphertext buffers are at least one block in size.
>> 1516 */
>> 1517 static inline void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
>> 1518 u8 *dst, const u8 *src)
>> 1519 {
>> 1520 crypto_cipher_crt(tfm)->cit_encrypt_one(crypto_cipher_tfm(tfm),
>> 1521 dst, src);
>> 1522 }
>> 1523
>> 1524 /**
>> 1525 * crypto_cipher_decrypt_one() - decrypt one block of ciphertext
>> 1526 * @tfm: cipher handle
>> 1527 * @dst: points to the buffer that will be filled with the plaintext
>> 1528 * @src: buffer holding the ciphertext to be decrypted
>> 1529 *
>> 1530 * Invoke the decryption operation of one block. The caller must ensure that
>> 1531 * the plaintext and ciphertext buffers are at least one block in size.
>> 1532 */
>> 1533 static inline void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
>> 1534 u8 *dst, const u8 *src)
>> 1535 {
>> 1536 crypto_cipher_crt(tfm)->cit_decrypt_one(crypto_cipher_tfm(tfm),
>> 1537 dst, src);
>> 1538 }
>> 1539
496 static inline struct crypto_comp *__crypto_com 1540 static inline struct crypto_comp *__crypto_comp_cast(struct crypto_tfm *tfm)
497 { 1541 {
498 return (struct crypto_comp *)tfm; 1542 return (struct crypto_comp *)tfm;
499 } 1543 }
500 1544
>> 1545 static inline struct crypto_comp *crypto_comp_cast(struct crypto_tfm *tfm)
>> 1546 {
>> 1547 BUG_ON((crypto_tfm_alg_type(tfm) ^ CRYPTO_ALG_TYPE_COMPRESS) &
>> 1548 CRYPTO_ALG_TYPE_MASK);
>> 1549 return __crypto_comp_cast(tfm);
>> 1550 }
>> 1551
501 static inline struct crypto_comp *crypto_alloc 1552 static inline struct crypto_comp *crypto_alloc_comp(const char *alg_name,
502 1553 u32 type, u32 mask)
503 { 1554 {
504 type &= ~CRYPTO_ALG_TYPE_MASK; 1555 type &= ~CRYPTO_ALG_TYPE_MASK;
505 type |= CRYPTO_ALG_TYPE_COMPRESS; 1556 type |= CRYPTO_ALG_TYPE_COMPRESS;
506 mask |= CRYPTO_ALG_TYPE_MASK; 1557 mask |= CRYPTO_ALG_TYPE_MASK;
507 1558
508 return __crypto_comp_cast(crypto_alloc 1559 return __crypto_comp_cast(crypto_alloc_base(alg_name, type, mask));
509 } 1560 }
510 1561
511 static inline struct crypto_tfm *crypto_comp_t 1562 static inline struct crypto_tfm *crypto_comp_tfm(struct crypto_comp *tfm)
512 { 1563 {
513 return &tfm->base; 1564 return &tfm->base;
514 } 1565 }
515 1566
516 static inline void crypto_free_comp(struct cry 1567 static inline void crypto_free_comp(struct crypto_comp *tfm)
517 { 1568 {
518 crypto_free_tfm(crypto_comp_tfm(tfm)); 1569 crypto_free_tfm(crypto_comp_tfm(tfm));
519 } 1570 }
520 1571
521 static inline int crypto_has_comp(const char * 1572 static inline int crypto_has_comp(const char *alg_name, u32 type, u32 mask)
522 { 1573 {
523 type &= ~CRYPTO_ALG_TYPE_MASK; 1574 type &= ~CRYPTO_ALG_TYPE_MASK;
524 type |= CRYPTO_ALG_TYPE_COMPRESS; 1575 type |= CRYPTO_ALG_TYPE_COMPRESS;
525 mask |= CRYPTO_ALG_TYPE_MASK; 1576 mask |= CRYPTO_ALG_TYPE_MASK;
526 1577
527 return crypto_has_alg(alg_name, type, 1578 return crypto_has_alg(alg_name, type, mask);
528 } 1579 }
529 1580
530 static inline const char *crypto_comp_name(str 1581 static inline const char *crypto_comp_name(struct crypto_comp *tfm)
531 { 1582 {
532 return crypto_tfm_alg_name(crypto_comp 1583 return crypto_tfm_alg_name(crypto_comp_tfm(tfm));
533 } 1584 }
534 1585
535 int crypto_comp_compress(struct crypto_comp *t !! 1586 static inline struct compress_tfm *crypto_comp_crt(struct crypto_comp *tfm)
536 const u8 *src, unsign !! 1587 {
537 u8 *dst, unsigned int !! 1588 return &crypto_comp_tfm(tfm)->crt_compress;
538 !! 1589 }
539 int crypto_comp_decompress(struct crypto_comp !! 1590
540 const u8 *src, unsi !! 1591 static inline int crypto_comp_compress(struct crypto_comp *tfm,
541 u8 *dst, unsigned i !! 1592 const u8 *src, unsigned int slen,
>> 1593 u8 *dst, unsigned int *dlen)
>> 1594 {
>> 1595 return crypto_comp_crt(tfm)->cot_compress(crypto_comp_tfm(tfm),
>> 1596 src, slen, dst, dlen);
>> 1597 }
>> 1598
>> 1599 static inline int crypto_comp_decompress(struct crypto_comp *tfm,
>> 1600 const u8 *src, unsigned int slen,
>> 1601 u8 *dst, unsigned int *dlen)
>> 1602 {
>> 1603 return crypto_comp_crt(tfm)->cot_decompress(crypto_comp_tfm(tfm),
>> 1604 src, slen, dst, dlen);
>> 1605 }
542 1606
543 #endif /* _LINUX_CRYPTO_H */ 1607 #endif /* _LINUX_CRYPTO_H */
544 1608
545 1609
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