Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Cryptographic API. |
| 3 | * |
| 4 | * Cipher operations. |
| 5 | * |
| 6 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 7 | * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the Free |
| 11 | * Software Foundation; either version 2 of the License, or (at your option) |
| 12 | * any later version. |
| 13 | * |
| 14 | */ |
| 15 | #include <linux/compiler.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/crypto.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <asm/scatterlist.h> |
| 23 | #include "internal.h" |
| 24 | #include "scatterwalk.h" |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | static inline void xor_64(u8 *a, const u8 *b) |
| 27 | { |
| 28 | ((u32 *)a)[0] ^= ((u32 *)b)[0]; |
| 29 | ((u32 *)a)[1] ^= ((u32 *)b)[1]; |
| 30 | } |
| 31 | |
| 32 | static inline void xor_128(u8 *a, const u8 *b) |
| 33 | { |
| 34 | ((u32 *)a)[0] ^= ((u32 *)b)[0]; |
| 35 | ((u32 *)a)[1] ^= ((u32 *)b)[1]; |
| 36 | ((u32 *)a)[2] ^= ((u32 *)b)[2]; |
| 37 | ((u32 *)a)[3] ^= ((u32 *)b)[3]; |
| 38 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 40 | static unsigned int crypt_slow(const struct cipher_desc *desc, |
| 41 | struct scatter_walk *in, |
| 42 | struct scatter_walk *out, unsigned int bsize) |
| 43 | { |
| 44 | u8 src[bsize]; |
| 45 | u8 dst[bsize]; |
| 46 | unsigned int n; |
| 47 | |
| 48 | n = scatterwalk_copychunks(src, in, bsize, 0); |
| 49 | scatterwalk_advance(in, n); |
| 50 | |
| 51 | desc->prfn(desc, dst, src, bsize); |
| 52 | |
| 53 | n = scatterwalk_copychunks(dst, out, bsize, 1); |
| 54 | scatterwalk_advance(out, n); |
| 55 | |
| 56 | return bsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | } |
| 58 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 59 | static inline unsigned int crypt_fast(const struct cipher_desc *desc, |
| 60 | struct scatter_walk *in, |
| 61 | struct scatter_walk *out, |
| 62 | unsigned int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 64 | u8 *src, *dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 66 | src = in->data; |
| 67 | dst = scatterwalk_samebuf(in, out) ? src : out->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 69 | nbytes = desc->prfn(desc, dst, src, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 71 | scatterwalk_advance(in, nbytes); |
| 72 | scatterwalk_advance(out, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 74 | return nbytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | /* |
| 78 | * Generic encrypt/decrypt wrapper for ciphers, handles operations across |
| 79 | * multiple page boundaries by using temporary blocks. In user context, |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 80 | * the kernel is given a chance to schedule us once per page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | */ |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 82 | static int crypt(const struct cipher_desc *desc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | struct scatterlist *dst, |
| 84 | struct scatterlist *src, |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 85 | unsigned int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
| 87 | struct scatter_walk walk_in, walk_out; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 88 | struct crypto_tfm *tfm = desc->tfm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | const unsigned int bsize = crypto_tfm_alg_blocksize(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | if (!nbytes) |
| 92 | return 0; |
| 93 | |
| 94 | if (nbytes % bsize) { |
| 95 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; |
| 96 | return -EINVAL; |
| 97 | } |
| 98 | |
| 99 | scatterwalk_start(&walk_in, src); |
| 100 | scatterwalk_start(&walk_out, dst); |
| 101 | |
| 102 | for(;;) { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 103 | unsigned int n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | scatterwalk_map(&walk_in, 0); |
| 106 | scatterwalk_map(&walk_out, 1); |
| 107 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 108 | n = scatterwalk_clamp(&walk_in, nbytes); |
| 109 | n = scatterwalk_clamp(&walk_out, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 111 | if (likely(n >= bsize)) |
| 112 | n = crypt_fast(desc, &walk_in, &walk_out, n); |
| 113 | else |
| 114 | n = crypt_slow(desc, &walk_in, &walk_out, bsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 116 | nbytes -= n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | scatterwalk_done(&walk_in, 0, nbytes); |
| 119 | scatterwalk_done(&walk_out, 1, nbytes); |
| 120 | |
| 121 | if (!nbytes) |
| 122 | return 0; |
| 123 | |
| 124 | crypto_yield(tfm); |
| 125 | } |
| 126 | } |
| 127 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 128 | static unsigned int cbc_process_encrypt(const struct cipher_desc *desc, |
| 129 | u8 *dst, const u8 *src, |
| 130 | unsigned int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 132 | struct crypto_tfm *tfm = desc->tfm; |
| 133 | void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block; |
| 134 | int bsize = crypto_tfm_alg_blocksize(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 136 | void (*fn)(void *, u8 *, const u8 *) = desc->crfn; |
| 137 | u8 *iv = desc->info; |
| 138 | unsigned int done = 0; |
| 139 | |
| 140 | do { |
| 141 | xor(iv, src); |
| 142 | fn(crypto_tfm_ctx(tfm), dst, iv); |
| 143 | memcpy(iv, dst, bsize); |
| 144 | |
| 145 | src += bsize; |
| 146 | dst += bsize; |
| 147 | } while ((done += bsize) < nbytes); |
| 148 | |
| 149 | return done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 152 | static unsigned int cbc_process_decrypt(const struct cipher_desc *desc, |
| 153 | u8 *dst, const u8 *src, |
| 154 | unsigned int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 156 | struct crypto_tfm *tfm = desc->tfm; |
| 157 | void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block; |
| 158 | int bsize = crypto_tfm_alg_blocksize(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 160 | u8 stack[src == dst ? bsize : 0]; |
| 161 | u8 *buf = stack; |
| 162 | u8 **dst_p = src == dst ? &buf : &dst; |
| 163 | |
| 164 | void (*fn)(void *, u8 *, const u8 *) = desc->crfn; |
| 165 | u8 *iv = desc->info; |
| 166 | unsigned int done = 0; |
| 167 | |
| 168 | do { |
| 169 | u8 *tmp_dst = *dst_p; |
| 170 | |
| 171 | fn(crypto_tfm_ctx(tfm), tmp_dst, src); |
| 172 | xor(tmp_dst, iv); |
| 173 | memcpy(iv, src, bsize); |
| 174 | if (tmp_dst != dst) |
| 175 | memcpy(dst, tmp_dst, bsize); |
| 176 | |
| 177 | src += bsize; |
| 178 | dst += bsize; |
| 179 | } while ((done += bsize) < nbytes); |
| 180 | |
| 181 | return done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 184 | static unsigned int ecb_process(const struct cipher_desc *desc, u8 *dst, |
| 185 | const u8 *src, unsigned int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 187 | struct crypto_tfm *tfm = desc->tfm; |
| 188 | int bsize = crypto_tfm_alg_blocksize(tfm); |
| 189 | void (*fn)(void *, u8 *, const u8 *) = desc->crfn; |
| 190 | unsigned int done = 0; |
| 191 | |
| 192 | do { |
| 193 | fn(crypto_tfm_ctx(tfm), dst, src); |
| 194 | |
| 195 | src += bsize; |
| 196 | dst += bsize; |
| 197 | } while ((done += bsize) < nbytes); |
| 198 | |
| 199 | return done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
| 203 | { |
| 204 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; |
| 205 | |
| 206 | if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) { |
| 207 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; |
| 208 | return -EINVAL; |
| 209 | } else |
| 210 | return cia->cia_setkey(crypto_tfm_ctx(tfm), key, keylen, |
| 211 | &tfm->crt_flags); |
| 212 | } |
| 213 | |
| 214 | static int ecb_encrypt(struct crypto_tfm *tfm, |
| 215 | struct scatterlist *dst, |
| 216 | struct scatterlist *src, unsigned int nbytes) |
| 217 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 218 | struct cipher_desc desc; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 219 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 220 | |
| 221 | desc.tfm = tfm; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 222 | desc.crfn = cipher->cia_encrypt; |
| 223 | desc.prfn = cipher->cia_encrypt_ecb ?: ecb_process; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 224 | |
| 225 | return crypt(&desc, dst, src, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | static int ecb_decrypt(struct crypto_tfm *tfm, |
| 229 | struct scatterlist *dst, |
| 230 | struct scatterlist *src, |
| 231 | unsigned int nbytes) |
| 232 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 233 | struct cipher_desc desc; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 234 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 235 | |
| 236 | desc.tfm = tfm; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 237 | desc.crfn = cipher->cia_decrypt; |
| 238 | desc.prfn = cipher->cia_decrypt_ecb ?: ecb_process; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 239 | |
| 240 | return crypt(&desc, dst, src, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | static int cbc_encrypt(struct crypto_tfm *tfm, |
| 244 | struct scatterlist *dst, |
| 245 | struct scatterlist *src, |
| 246 | unsigned int nbytes) |
| 247 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 248 | struct cipher_desc desc; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 249 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 250 | |
| 251 | desc.tfm = tfm; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 252 | desc.crfn = cipher->cia_encrypt; |
| 253 | desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 254 | desc.info = tfm->crt_cipher.cit_iv; |
| 255 | |
| 256 | return crypt(&desc, dst, src, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | } |
| 258 | |
| 259 | static int cbc_encrypt_iv(struct crypto_tfm *tfm, |
| 260 | struct scatterlist *dst, |
| 261 | struct scatterlist *src, |
| 262 | unsigned int nbytes, u8 *iv) |
| 263 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 264 | struct cipher_desc desc; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 265 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 266 | |
| 267 | desc.tfm = tfm; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 268 | desc.crfn = cipher->cia_encrypt; |
| 269 | desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 270 | desc.info = iv; |
| 271 | |
| 272 | return crypt(&desc, dst, src, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | static int cbc_decrypt(struct crypto_tfm *tfm, |
| 276 | struct scatterlist *dst, |
| 277 | struct scatterlist *src, |
| 278 | unsigned int nbytes) |
| 279 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 280 | struct cipher_desc desc; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 281 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 282 | |
| 283 | desc.tfm = tfm; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 284 | desc.crfn = cipher->cia_decrypt; |
| 285 | desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 286 | desc.info = tfm->crt_cipher.cit_iv; |
| 287 | |
| 288 | return crypt(&desc, dst, src, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | static int cbc_decrypt_iv(struct crypto_tfm *tfm, |
| 292 | struct scatterlist *dst, |
| 293 | struct scatterlist *src, |
| 294 | unsigned int nbytes, u8 *iv) |
| 295 | { |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 296 | struct cipher_desc desc; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 297 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 298 | |
| 299 | desc.tfm = tfm; |
Herbert Xu | 4072518 | 2005-07-06 13:51:52 -0700 | [diff] [blame^] | 300 | desc.crfn = cipher->cia_decrypt; |
| 301 | desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt; |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 302 | desc.info = iv; |
| 303 | |
| 304 | return crypt(&desc, dst, src, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | static int nocrypt(struct crypto_tfm *tfm, |
| 308 | struct scatterlist *dst, |
| 309 | struct scatterlist *src, |
| 310 | unsigned int nbytes) |
| 311 | { |
| 312 | return -ENOSYS; |
| 313 | } |
| 314 | |
| 315 | static int nocrypt_iv(struct crypto_tfm *tfm, |
| 316 | struct scatterlist *dst, |
| 317 | struct scatterlist *src, |
| 318 | unsigned int nbytes, u8 *iv) |
| 319 | { |
| 320 | return -ENOSYS; |
| 321 | } |
| 322 | |
| 323 | int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags) |
| 324 | { |
| 325 | u32 mode = flags & CRYPTO_TFM_MODE_MASK; |
| 326 | |
| 327 | tfm->crt_cipher.cit_mode = mode ? mode : CRYPTO_TFM_MODE_ECB; |
| 328 | if (flags & CRYPTO_TFM_REQ_WEAK_KEY) |
| 329 | tfm->crt_flags = CRYPTO_TFM_REQ_WEAK_KEY; |
| 330 | |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | int crypto_init_cipher_ops(struct crypto_tfm *tfm) |
| 335 | { |
| 336 | int ret = 0; |
| 337 | struct cipher_tfm *ops = &tfm->crt_cipher; |
| 338 | |
| 339 | ops->cit_setkey = setkey; |
| 340 | |
| 341 | switch (tfm->crt_cipher.cit_mode) { |
| 342 | case CRYPTO_TFM_MODE_ECB: |
| 343 | ops->cit_encrypt = ecb_encrypt; |
| 344 | ops->cit_decrypt = ecb_decrypt; |
| 345 | break; |
| 346 | |
| 347 | case CRYPTO_TFM_MODE_CBC: |
| 348 | ops->cit_encrypt = cbc_encrypt; |
| 349 | ops->cit_decrypt = cbc_decrypt; |
| 350 | ops->cit_encrypt_iv = cbc_encrypt_iv; |
| 351 | ops->cit_decrypt_iv = cbc_decrypt_iv; |
| 352 | break; |
| 353 | |
| 354 | case CRYPTO_TFM_MODE_CFB: |
| 355 | ops->cit_encrypt = nocrypt; |
| 356 | ops->cit_decrypt = nocrypt; |
| 357 | ops->cit_encrypt_iv = nocrypt_iv; |
| 358 | ops->cit_decrypt_iv = nocrypt_iv; |
| 359 | break; |
| 360 | |
| 361 | case CRYPTO_TFM_MODE_CTR: |
| 362 | ops->cit_encrypt = nocrypt; |
| 363 | ops->cit_decrypt = nocrypt; |
| 364 | ops->cit_encrypt_iv = nocrypt_iv; |
| 365 | ops->cit_decrypt_iv = nocrypt_iv; |
| 366 | break; |
| 367 | |
| 368 | default: |
| 369 | BUG(); |
| 370 | } |
| 371 | |
| 372 | if (ops->cit_mode == CRYPTO_TFM_MODE_CBC) { |
| 373 | |
| 374 | switch (crypto_tfm_alg_blocksize(tfm)) { |
| 375 | case 8: |
| 376 | ops->cit_xor_block = xor_64; |
| 377 | break; |
| 378 | |
| 379 | case 16: |
| 380 | ops->cit_xor_block = xor_128; |
| 381 | break; |
| 382 | |
| 383 | default: |
| 384 | printk(KERN_WARNING "%s: block size %u not supported\n", |
| 385 | crypto_tfm_alg_name(tfm), |
| 386 | crypto_tfm_alg_blocksize(tfm)); |
| 387 | ret = -EINVAL; |
| 388 | goto out; |
| 389 | } |
| 390 | |
| 391 | ops->cit_ivsize = crypto_tfm_alg_blocksize(tfm); |
| 392 | ops->cit_iv = kmalloc(ops->cit_ivsize, GFP_KERNEL); |
| 393 | if (ops->cit_iv == NULL) |
| 394 | ret = -ENOMEM; |
| 395 | } |
| 396 | |
| 397 | out: |
| 398 | return ret; |
| 399 | } |
| 400 | |
| 401 | void crypto_exit_cipher_ops(struct crypto_tfm *tfm) |
| 402 | { |
Jesper Juhl | 8279dd7 | 2005-07-06 13:51:00 -0700 | [diff] [blame] | 403 | kfree(tfm->crt_cipher.cit_iv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |