1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * PCBC: Propagating Cipher Block Chaining mod 2 * PCBC: Propagating Cipher Block Chaining mode
4 * 3 *
5 * Copyright (C) 2006 Red Hat, Inc. All Rights 4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
6 * Written by David Howells (dhowells@redhat.c 5 * Written by David Howells (dhowells@redhat.com)
7 * 6 *
8 * Derived from cbc.c 7 * Derived from cbc.c
9 * - Copyright (c) 2006 Herbert Xu <herbert@go 8 * - Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
>> 9 *
>> 10 * This program is free software; you can redistribute it and/or modify it
>> 11 * under the terms of the GNU General Public License as published by the Free
>> 12 * Software Foundation; either version 2 of the License, or (at your option)
>> 13 * any later version.
>> 14 *
10 */ 15 */
11 16
12 #include <crypto/algapi.h> 17 #include <crypto/algapi.h>
13 #include <crypto/internal/cipher.h> <<
14 #include <crypto/internal/skcipher.h> 18 #include <crypto/internal/skcipher.h>
15 #include <linux/err.h> 19 #include <linux/err.h>
16 #include <linux/init.h> 20 #include <linux/init.h>
17 #include <linux/kernel.h> 21 #include <linux/kernel.h>
18 #include <linux/module.h> 22 #include <linux/module.h>
19 23
20 static int crypto_pcbc_encrypt_segment(struct 24 static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
21 struct 25 struct skcipher_walk *walk,
22 struct 26 struct crypto_cipher *tfm)
23 { 27 {
24 int bsize = crypto_cipher_blocksize(tf 28 int bsize = crypto_cipher_blocksize(tfm);
25 unsigned int nbytes = walk->nbytes; 29 unsigned int nbytes = walk->nbytes;
26 u8 *src = walk->src.virt.addr; 30 u8 *src = walk->src.virt.addr;
27 u8 *dst = walk->dst.virt.addr; 31 u8 *dst = walk->dst.virt.addr;
28 u8 * const iv = walk->iv; 32 u8 * const iv = walk->iv;
29 33
30 do { 34 do {
31 crypto_xor(iv, src, bsize); 35 crypto_xor(iv, src, bsize);
32 crypto_cipher_encrypt_one(tfm, 36 crypto_cipher_encrypt_one(tfm, dst, iv);
33 crypto_xor_cpy(iv, dst, src, b 37 crypto_xor_cpy(iv, dst, src, bsize);
34 38
35 src += bsize; 39 src += bsize;
36 dst += bsize; 40 dst += bsize;
37 } while ((nbytes -= bsize) >= bsize); 41 } while ((nbytes -= bsize) >= bsize);
38 42
39 return nbytes; 43 return nbytes;
40 } 44 }
41 45
42 static int crypto_pcbc_encrypt_inplace(struct 46 static int crypto_pcbc_encrypt_inplace(struct skcipher_request *req,
43 struct 47 struct skcipher_walk *walk,
44 struct 48 struct crypto_cipher *tfm)
45 { 49 {
46 int bsize = crypto_cipher_blocksize(tf 50 int bsize = crypto_cipher_blocksize(tfm);
47 unsigned int nbytes = walk->nbytes; 51 unsigned int nbytes = walk->nbytes;
48 u8 *src = walk->src.virt.addr; 52 u8 *src = walk->src.virt.addr;
49 u8 * const iv = walk->iv; 53 u8 * const iv = walk->iv;
50 u8 tmpbuf[MAX_CIPHER_BLOCKSIZE]; 54 u8 tmpbuf[MAX_CIPHER_BLOCKSIZE];
51 55
52 do { 56 do {
53 memcpy(tmpbuf, src, bsize); 57 memcpy(tmpbuf, src, bsize);
54 crypto_xor(iv, src, bsize); 58 crypto_xor(iv, src, bsize);
55 crypto_cipher_encrypt_one(tfm, 59 crypto_cipher_encrypt_one(tfm, src, iv);
56 crypto_xor_cpy(iv, tmpbuf, src 60 crypto_xor_cpy(iv, tmpbuf, src, bsize);
57 61
58 src += bsize; 62 src += bsize;
59 } while ((nbytes -= bsize) >= bsize); 63 } while ((nbytes -= bsize) >= bsize);
60 64
61 return nbytes; 65 return nbytes;
62 } 66 }
63 67
64 static int crypto_pcbc_encrypt(struct skcipher 68 static int crypto_pcbc_encrypt(struct skcipher_request *req)
65 { 69 {
66 struct crypto_skcipher *tfm = crypto_s 70 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
67 struct crypto_cipher *cipher = skciphe 71 struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
68 struct skcipher_walk walk; 72 struct skcipher_walk walk;
69 unsigned int nbytes; 73 unsigned int nbytes;
70 int err; 74 int err;
71 75
72 err = skcipher_walk_virt(&walk, req, f 76 err = skcipher_walk_virt(&walk, req, false);
73 77
74 while (walk.nbytes) { !! 78 while ((nbytes = walk.nbytes)) {
75 if (walk.src.virt.addr == walk 79 if (walk.src.virt.addr == walk.dst.virt.addr)
76 nbytes = crypto_pcbc_e 80 nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
77 81 cipher);
78 else 82 else
79 nbytes = crypto_pcbc_e 83 nbytes = crypto_pcbc_encrypt_segment(req, &walk,
80 84 cipher);
81 err = skcipher_walk_done(&walk 85 err = skcipher_walk_done(&walk, nbytes);
82 } 86 }
83 87
84 return err; 88 return err;
85 } 89 }
86 90
87 static int crypto_pcbc_decrypt_segment(struct 91 static int crypto_pcbc_decrypt_segment(struct skcipher_request *req,
88 struct 92 struct skcipher_walk *walk,
89 struct 93 struct crypto_cipher *tfm)
90 { 94 {
91 int bsize = crypto_cipher_blocksize(tf 95 int bsize = crypto_cipher_blocksize(tfm);
92 unsigned int nbytes = walk->nbytes; 96 unsigned int nbytes = walk->nbytes;
93 u8 *src = walk->src.virt.addr; 97 u8 *src = walk->src.virt.addr;
94 u8 *dst = walk->dst.virt.addr; 98 u8 *dst = walk->dst.virt.addr;
95 u8 * const iv = walk->iv; 99 u8 * const iv = walk->iv;
96 100
97 do { 101 do {
98 crypto_cipher_decrypt_one(tfm, 102 crypto_cipher_decrypt_one(tfm, dst, src);
99 crypto_xor(dst, iv, bsize); 103 crypto_xor(dst, iv, bsize);
100 crypto_xor_cpy(iv, dst, src, b 104 crypto_xor_cpy(iv, dst, src, bsize);
101 105
102 src += bsize; 106 src += bsize;
103 dst += bsize; 107 dst += bsize;
104 } while ((nbytes -= bsize) >= bsize); 108 } while ((nbytes -= bsize) >= bsize);
105 109
106 return nbytes; 110 return nbytes;
107 } 111 }
108 112
109 static int crypto_pcbc_decrypt_inplace(struct 113 static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
110 struct 114 struct skcipher_walk *walk,
111 struct 115 struct crypto_cipher *tfm)
112 { 116 {
113 int bsize = crypto_cipher_blocksize(tf 117 int bsize = crypto_cipher_blocksize(tfm);
114 unsigned int nbytes = walk->nbytes; 118 unsigned int nbytes = walk->nbytes;
115 u8 *src = walk->src.virt.addr; 119 u8 *src = walk->src.virt.addr;
116 u8 * const iv = walk->iv; 120 u8 * const iv = walk->iv;
117 u8 tmpbuf[MAX_CIPHER_BLOCKSIZE] __alig 121 u8 tmpbuf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(u32));
118 122
119 do { 123 do {
120 memcpy(tmpbuf, src, bsize); 124 memcpy(tmpbuf, src, bsize);
121 crypto_cipher_decrypt_one(tfm, 125 crypto_cipher_decrypt_one(tfm, src, src);
122 crypto_xor(src, iv, bsize); 126 crypto_xor(src, iv, bsize);
123 crypto_xor_cpy(iv, src, tmpbuf 127 crypto_xor_cpy(iv, src, tmpbuf, bsize);
124 128
125 src += bsize; 129 src += bsize;
126 } while ((nbytes -= bsize) >= bsize); 130 } while ((nbytes -= bsize) >= bsize);
127 131
128 return nbytes; 132 return nbytes;
129 } 133 }
130 134
131 static int crypto_pcbc_decrypt(struct skcipher 135 static int crypto_pcbc_decrypt(struct skcipher_request *req)
132 { 136 {
133 struct crypto_skcipher *tfm = crypto_s 137 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
134 struct crypto_cipher *cipher = skciphe 138 struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
135 struct skcipher_walk walk; 139 struct skcipher_walk walk;
136 unsigned int nbytes; 140 unsigned int nbytes;
137 int err; 141 int err;
138 142
139 err = skcipher_walk_virt(&walk, req, f 143 err = skcipher_walk_virt(&walk, req, false);
140 144
141 while (walk.nbytes) { !! 145 while ((nbytes = walk.nbytes)) {
142 if (walk.src.virt.addr == walk 146 if (walk.src.virt.addr == walk.dst.virt.addr)
143 nbytes = crypto_pcbc_d 147 nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
144 148 cipher);
145 else 149 else
146 nbytes = crypto_pcbc_d 150 nbytes = crypto_pcbc_decrypt_segment(req, &walk,
147 151 cipher);
148 err = skcipher_walk_done(&walk 152 err = skcipher_walk_done(&walk, nbytes);
149 } 153 }
150 154
151 return err; 155 return err;
152 } 156 }
153 157
154 static int crypto_pcbc_create(struct crypto_te 158 static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
155 { 159 {
156 struct skcipher_instance *inst; 160 struct skcipher_instance *inst;
>> 161 struct crypto_alg *alg;
157 int err; 162 int err;
158 163
159 inst = skcipher_alloc_instance_simple( !! 164 inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
160 if (IS_ERR(inst)) 165 if (IS_ERR(inst))
161 return PTR_ERR(inst); 166 return PTR_ERR(inst);
162 167
163 inst->alg.encrypt = crypto_pcbc_encryp 168 inst->alg.encrypt = crypto_pcbc_encrypt;
164 inst->alg.decrypt = crypto_pcbc_decryp 169 inst->alg.decrypt = crypto_pcbc_decrypt;
165 170
166 err = skcipher_register_instance(tmpl, 171 err = skcipher_register_instance(tmpl, inst);
167 if (err) 172 if (err)
168 inst->free(inst); 173 inst->free(inst);
169 !! 174 crypto_mod_put(alg);
170 return err; 175 return err;
171 } 176 }
172 177
173 static struct crypto_template crypto_pcbc_tmpl 178 static struct crypto_template crypto_pcbc_tmpl = {
174 .name = "pcbc", 179 .name = "pcbc",
175 .create = crypto_pcbc_create, 180 .create = crypto_pcbc_create,
176 .module = THIS_MODULE, 181 .module = THIS_MODULE,
177 }; 182 };
178 183
179 static int __init crypto_pcbc_module_init(void 184 static int __init crypto_pcbc_module_init(void)
180 { 185 {
181 return crypto_register_template(&crypt 186 return crypto_register_template(&crypto_pcbc_tmpl);
182 } 187 }
183 188
184 static void __exit crypto_pcbc_module_exit(voi 189 static void __exit crypto_pcbc_module_exit(void)
185 { 190 {
186 crypto_unregister_template(&crypto_pcb 191 crypto_unregister_template(&crypto_pcbc_tmpl);
187 } 192 }
188 193
189 subsys_initcall(crypto_pcbc_module_init); !! 194 module_init(crypto_pcbc_module_init);
190 module_exit(crypto_pcbc_module_exit); 195 module_exit(crypto_pcbc_module_exit);
191 196
192 MODULE_LICENSE("GPL"); 197 MODULE_LICENSE("GPL");
193 MODULE_DESCRIPTION("PCBC block cipher mode of 198 MODULE_DESCRIPTION("PCBC block cipher mode of operation");
194 MODULE_ALIAS_CRYPTO("pcbc"); 199 MODULE_ALIAS_CRYPTO("pcbc");
195 MODULE_IMPORT_NS(CRYPTO_INTERNAL); <<
196 200
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.