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