blob: 9e03701cfdcc692efb33ee2d682eff02d5dd10a9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Cryptographic API.
3 *
4 * Cipher operations.
5 *
6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
Herbert Xuc774e932005-07-06 13:51:31 -07007 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
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
Herbert Xu7226bc872006-08-21 21:40:49 +100026struct cipher_alg_compat {
27 unsigned int cia_min_keysize;
28 unsigned int cia_max_keysize;
29 int (*cia_setkey)(struct crypto_tfm *tfm, const u8 *key,
30 unsigned int keylen);
31 void (*cia_encrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
32 void (*cia_decrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
33
34 unsigned int (*cia_encrypt_ecb)(const struct cipher_desc *desc,
35 u8 *dst, const u8 *src,
36 unsigned int nbytes);
37 unsigned int (*cia_decrypt_ecb)(const struct cipher_desc *desc,
38 u8 *dst, const u8 *src,
39 unsigned int nbytes);
40 unsigned int (*cia_encrypt_cbc)(const struct cipher_desc *desc,
41 u8 *dst, const u8 *src,
42 unsigned int nbytes);
43 unsigned int (*cia_decrypt_cbc)(const struct cipher_desc *desc,
44 u8 *dst, const u8 *src,
45 unsigned int nbytes);
46};
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048static inline void xor_64(u8 *a, const u8 *b)
49{
50 ((u32 *)a)[0] ^= ((u32 *)b)[0];
51 ((u32 *)a)[1] ^= ((u32 *)b)[1];
52}
53
54static inline void xor_128(u8 *a, const u8 *b)
55{
56 ((u32 *)a)[0] ^= ((u32 *)b)[0];
57 ((u32 *)a)[1] ^= ((u32 *)b)[1];
58 ((u32 *)a)[2] ^= ((u32 *)b)[2];
59 ((u32 *)a)[3] ^= ((u32 *)b)[3];
60}
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Herbert Xuc774e932005-07-06 13:51:31 -070062static unsigned int crypt_slow(const struct cipher_desc *desc,
63 struct scatter_walk *in,
64 struct scatter_walk *out, unsigned int bsize)
65{
Herbert Xu9d853c32005-07-15 07:41:31 -070066 unsigned long alignmask = crypto_tfm_alg_alignmask(desc->tfm);
Herbert Xu95477372005-07-06 13:52:09 -070067 u8 buffer[bsize * 2 + alignmask];
68 u8 *src = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
69 u8 *dst = src + bsize;
Herbert Xuc774e932005-07-06 13:51:31 -070070
Herbert Xu5c640972006-08-12 21:56:17 +100071 scatterwalk_copychunks(src, in, bsize, 0);
Herbert Xuc774e932005-07-06 13:51:31 -070072 desc->prfn(desc, dst, src, bsize);
Herbert Xu5c640972006-08-12 21:56:17 +100073 scatterwalk_copychunks(dst, out, bsize, 1);
Herbert Xuc774e932005-07-06 13:51:31 -070074
75 return bsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
Herbert Xuc774e932005-07-06 13:51:31 -070078static inline unsigned int crypt_fast(const struct cipher_desc *desc,
79 struct scatter_walk *in,
80 struct scatter_walk *out,
Herbert Xu95477372005-07-06 13:52:09 -070081 unsigned int nbytes, u8 *tmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
Herbert Xuc774e932005-07-06 13:51:31 -070083 u8 *src, *dst;
Herbert Xu5c640972006-08-12 21:56:17 +100084 u8 *real_src, *real_dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Herbert Xu5c640972006-08-12 21:56:17 +100086 real_src = scatterwalk_map(in, 0);
87 real_dst = scatterwalk_map(out, 1);
88
89 src = real_src;
90 dst = scatterwalk_samebuf(in, out) ? src : real_dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Herbert Xu95477372005-07-06 13:52:09 -070092 if (tmp) {
Herbert Xu5c640972006-08-12 21:56:17 +100093 memcpy(tmp, src, nbytes);
Herbert Xu95477372005-07-06 13:52:09 -070094 src = tmp;
95 dst = tmp;
96 }
97
Herbert Xuc774e932005-07-06 13:51:31 -070098 nbytes = desc->prfn(desc, dst, src, nbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Herbert Xu95477372005-07-06 13:52:09 -0700100 if (tmp)
Herbert Xu5c640972006-08-12 21:56:17 +1000101 memcpy(real_dst, tmp, nbytes);
102
103 scatterwalk_unmap(real_src, 0);
104 scatterwalk_unmap(real_dst, 1);
Herbert Xu95477372005-07-06 13:52:09 -0700105
Herbert Xuc774e932005-07-06 13:51:31 -0700106 scatterwalk_advance(in, nbytes);
107 scatterwalk_advance(out, nbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Herbert Xuc774e932005-07-06 13:51:31 -0700109 return nbytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
112/*
113 * Generic encrypt/decrypt wrapper for ciphers, handles operations across
114 * multiple page boundaries by using temporary blocks. In user context,
Herbert Xuc774e932005-07-06 13:51:31 -0700115 * the kernel is given a chance to schedule us once per page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 */
Herbert Xuc774e932005-07-06 13:51:31 -0700117static int crypt(const struct cipher_desc *desc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 struct scatterlist *dst,
119 struct scatterlist *src,
Herbert Xuc774e932005-07-06 13:51:31 -0700120 unsigned int nbytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
122 struct scatter_walk walk_in, walk_out;
Herbert Xuc774e932005-07-06 13:51:31 -0700123 struct crypto_tfm *tfm = desc->tfm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
Herbert Xufbdae9f2005-07-06 13:53:29 -0700125 unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
Herbert Xu95477372005-07-06 13:52:09 -0700126 unsigned long buffer = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 if (!nbytes)
129 return 0;
130
131 if (nbytes % bsize) {
132 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
133 return -EINVAL;
134 }
135
136 scatterwalk_start(&walk_in, src);
137 scatterwalk_start(&walk_out, dst);
138
139 for(;;) {
Herbert Xu95477372005-07-06 13:52:09 -0700140 unsigned int n = nbytes;
141 u8 *tmp = NULL;
142
143 if (!scatterwalk_aligned(&walk_in, alignmask) ||
144 !scatterwalk_aligned(&walk_out, alignmask)) {
145 if (!buffer) {
146 buffer = __get_free_page(GFP_ATOMIC);
147 if (!buffer)
148 n = 0;
149 }
150 tmp = (u8 *)buffer;
151 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Herbert Xu95477372005-07-06 13:52:09 -0700153 n = scatterwalk_clamp(&walk_in, n);
Herbert Xuc774e932005-07-06 13:51:31 -0700154 n = scatterwalk_clamp(&walk_out, n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Herbert Xuc774e932005-07-06 13:51:31 -0700156 if (likely(n >= bsize))
Herbert Xu95477372005-07-06 13:52:09 -0700157 n = crypt_fast(desc, &walk_in, &walk_out, n, tmp);
Herbert Xuc774e932005-07-06 13:51:31 -0700158 else
159 n = crypt_slow(desc, &walk_in, &walk_out, bsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Herbert Xuc774e932005-07-06 13:51:31 -0700161 nbytes -= n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 scatterwalk_done(&walk_in, 0, nbytes);
164 scatterwalk_done(&walk_out, 1, nbytes);
165
166 if (!nbytes)
Herbert Xu95477372005-07-06 13:52:09 -0700167 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Herbert Xu8f21cf02006-07-30 11:53:45 +1000169 crypto_yield(tfm->crt_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 }
Herbert Xu95477372005-07-06 13:52:09 -0700171
172 if (buffer)
173 free_page(buffer);
174
175 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
Herbert Xu915e8562005-07-06 13:53:47 -0700178static int crypt_iv_unaligned(struct cipher_desc *desc,
179 struct scatterlist *dst,
180 struct scatterlist *src,
181 unsigned int nbytes)
182{
183 struct crypto_tfm *tfm = desc->tfm;
Herbert Xu9d853c32005-07-15 07:41:31 -0700184 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
Herbert Xu915e8562005-07-06 13:53:47 -0700185 u8 *iv = desc->info;
186
187 if (unlikely(((unsigned long)iv & alignmask))) {
188 unsigned int ivsize = tfm->crt_cipher.cit_ivsize;
189 u8 buffer[ivsize + alignmask];
190 u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
191 int err;
192
193 desc->info = memcpy(tmp, iv, ivsize);
194 err = crypt(desc, dst, src, nbytes);
195 memcpy(iv, tmp, ivsize);
196
197 return err;
198 }
199
200 return crypt(desc, dst, src, nbytes);
201}
202
Herbert Xuc774e932005-07-06 13:51:31 -0700203static unsigned int cbc_process_encrypt(const struct cipher_desc *desc,
204 u8 *dst, const u8 *src,
205 unsigned int nbytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
Herbert Xuc774e932005-07-06 13:51:31 -0700207 struct crypto_tfm *tfm = desc->tfm;
208 void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block;
209 int bsize = crypto_tfm_alg_blocksize(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Herbert Xu6c2bb982006-05-16 22:09:29 +1000211 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn;
Herbert Xuc774e932005-07-06 13:51:31 -0700212 u8 *iv = desc->info;
213 unsigned int done = 0;
214
Herbert Xufe2d5292005-09-06 14:49:44 -0700215 nbytes -= bsize;
216
Herbert Xuc774e932005-07-06 13:51:31 -0700217 do {
218 xor(iv, src);
Herbert Xu6c2bb982006-05-16 22:09:29 +1000219 fn(tfm, dst, iv);
Herbert Xuc774e932005-07-06 13:51:31 -0700220 memcpy(iv, dst, bsize);
221
222 src += bsize;
223 dst += bsize;
Herbert Xufe2d5292005-09-06 14:49:44 -0700224 } while ((done += bsize) <= nbytes);
Herbert Xuc774e932005-07-06 13:51:31 -0700225
226 return done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
Herbert Xuc774e932005-07-06 13:51:31 -0700229static unsigned int cbc_process_decrypt(const struct cipher_desc *desc,
230 u8 *dst, const u8 *src,
231 unsigned int nbytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Herbert Xuc774e932005-07-06 13:51:31 -0700233 struct crypto_tfm *tfm = desc->tfm;
234 void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block;
235 int bsize = crypto_tfm_alg_blocksize(tfm);
Herbert Xu827c3912005-11-29 22:04:41 +1100236 unsigned long alignmask = crypto_tfm_alg_alignmask(desc->tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Herbert Xu827c3912005-11-29 22:04:41 +1100238 u8 stack[src == dst ? bsize + alignmask : 0];
239 u8 *buf = (u8 *)ALIGN((unsigned long)stack, alignmask + 1);
Herbert Xuc774e932005-07-06 13:51:31 -0700240 u8 **dst_p = src == dst ? &buf : &dst;
241
Herbert Xu6c2bb982006-05-16 22:09:29 +1000242 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn;
Herbert Xuc774e932005-07-06 13:51:31 -0700243 u8 *iv = desc->info;
244 unsigned int done = 0;
245
Herbert Xufe2d5292005-09-06 14:49:44 -0700246 nbytes -= bsize;
247
Herbert Xuc774e932005-07-06 13:51:31 -0700248 do {
249 u8 *tmp_dst = *dst_p;
250
Herbert Xu6c2bb982006-05-16 22:09:29 +1000251 fn(tfm, tmp_dst, src);
Herbert Xuc774e932005-07-06 13:51:31 -0700252 xor(tmp_dst, iv);
253 memcpy(iv, src, bsize);
254 if (tmp_dst != dst)
255 memcpy(dst, tmp_dst, bsize);
256
257 src += bsize;
258 dst += bsize;
Herbert Xufe2d5292005-09-06 14:49:44 -0700259 } while ((done += bsize) <= nbytes);
Herbert Xuc774e932005-07-06 13:51:31 -0700260
261 return done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262}
263
Herbert Xuc774e932005-07-06 13:51:31 -0700264static unsigned int ecb_process(const struct cipher_desc *desc, u8 *dst,
265 const u8 *src, unsigned int nbytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
Herbert Xuc774e932005-07-06 13:51:31 -0700267 struct crypto_tfm *tfm = desc->tfm;
268 int bsize = crypto_tfm_alg_blocksize(tfm);
Herbert Xu6c2bb982006-05-16 22:09:29 +1000269 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn;
Herbert Xuc774e932005-07-06 13:51:31 -0700270 unsigned int done = 0;
271
Herbert Xufe2d5292005-09-06 14:49:44 -0700272 nbytes -= bsize;
273
Herbert Xuc774e932005-07-06 13:51:31 -0700274 do {
Herbert Xu6c2bb982006-05-16 22:09:29 +1000275 fn(tfm, dst, src);
Herbert Xuc774e932005-07-06 13:51:31 -0700276
277 src += bsize;
278 dst += bsize;
Herbert Xufe2d5292005-09-06 14:49:44 -0700279 } while ((done += bsize) <= nbytes);
Herbert Xuc774e932005-07-06 13:51:31 -0700280
281 return done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
283
284static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
285{
286 struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
287
Herbert Xu560c06a2006-08-13 14:16:39 +1000288 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
290 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
291 return -EINVAL;
292 } else
Herbert Xu560c06a2006-08-13 14:16:39 +1000293 return cia->cia_setkey(tfm, key, keylen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
296static int ecb_encrypt(struct crypto_tfm *tfm,
297 struct scatterlist *dst,
298 struct scatterlist *src, unsigned int nbytes)
299{
Herbert Xuc774e932005-07-06 13:51:31 -0700300 struct cipher_desc desc;
Herbert Xu7226bc872006-08-21 21:40:49 +1000301 struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
Herbert Xuc774e932005-07-06 13:51:31 -0700302
303 desc.tfm = tfm;
Herbert Xu40725182005-07-06 13:51:52 -0700304 desc.crfn = cipher->cia_encrypt;
305 desc.prfn = cipher->cia_encrypt_ecb ?: ecb_process;
Herbert Xuc774e932005-07-06 13:51:31 -0700306
307 return crypt(&desc, dst, src, nbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308}
309
310static int ecb_decrypt(struct crypto_tfm *tfm,
311 struct scatterlist *dst,
312 struct scatterlist *src,
313 unsigned int nbytes)
314{
Herbert Xuc774e932005-07-06 13:51:31 -0700315 struct cipher_desc desc;
Herbert Xu7226bc872006-08-21 21:40:49 +1000316 struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
Herbert Xuc774e932005-07-06 13:51:31 -0700317
318 desc.tfm = tfm;
Herbert Xu40725182005-07-06 13:51:52 -0700319 desc.crfn = cipher->cia_decrypt;
320 desc.prfn = cipher->cia_decrypt_ecb ?: ecb_process;
Herbert Xuc774e932005-07-06 13:51:31 -0700321
322 return crypt(&desc, dst, src, nbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323}
324
325static int cbc_encrypt(struct crypto_tfm *tfm,
326 struct scatterlist *dst,
327 struct scatterlist *src,
328 unsigned int nbytes)
329{
Herbert Xuc774e932005-07-06 13:51:31 -0700330 struct cipher_desc desc;
Herbert Xu7226bc872006-08-21 21:40:49 +1000331 struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
Herbert Xuc774e932005-07-06 13:51:31 -0700332
333 desc.tfm = tfm;
Herbert Xu40725182005-07-06 13:51:52 -0700334 desc.crfn = cipher->cia_encrypt;
335 desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt;
Herbert Xuc774e932005-07-06 13:51:31 -0700336 desc.info = tfm->crt_cipher.cit_iv;
337
338 return crypt(&desc, dst, src, nbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
340
341static int cbc_encrypt_iv(struct crypto_tfm *tfm,
342 struct scatterlist *dst,
343 struct scatterlist *src,
344 unsigned int nbytes, u8 *iv)
345{
Herbert Xuc774e932005-07-06 13:51:31 -0700346 struct cipher_desc desc;
Herbert Xu7226bc872006-08-21 21:40:49 +1000347 struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
Herbert Xuc774e932005-07-06 13:51:31 -0700348
349 desc.tfm = tfm;
Herbert Xu40725182005-07-06 13:51:52 -0700350 desc.crfn = cipher->cia_encrypt;
351 desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt;
Herbert Xuc774e932005-07-06 13:51:31 -0700352 desc.info = iv;
353
Herbert Xu915e8562005-07-06 13:53:47 -0700354 return crypt_iv_unaligned(&desc, dst, src, nbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355}
356
357static int cbc_decrypt(struct crypto_tfm *tfm,
358 struct scatterlist *dst,
359 struct scatterlist *src,
360 unsigned int nbytes)
361{
Herbert Xuc774e932005-07-06 13:51:31 -0700362 struct cipher_desc desc;
Herbert Xu7226bc872006-08-21 21:40:49 +1000363 struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
Herbert Xuc774e932005-07-06 13:51:31 -0700364
365 desc.tfm = tfm;
Herbert Xu40725182005-07-06 13:51:52 -0700366 desc.crfn = cipher->cia_decrypt;
367 desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt;
Herbert Xuc774e932005-07-06 13:51:31 -0700368 desc.info = tfm->crt_cipher.cit_iv;
369
370 return crypt(&desc, dst, src, nbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371}
372
373static int cbc_decrypt_iv(struct crypto_tfm *tfm,
374 struct scatterlist *dst,
375 struct scatterlist *src,
376 unsigned int nbytes, u8 *iv)
377{
Herbert Xuc774e932005-07-06 13:51:31 -0700378 struct cipher_desc desc;
Herbert Xu7226bc872006-08-21 21:40:49 +1000379 struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
Herbert Xuc774e932005-07-06 13:51:31 -0700380
381 desc.tfm = tfm;
Herbert Xu40725182005-07-06 13:51:52 -0700382 desc.crfn = cipher->cia_decrypt;
383 desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt;
Herbert Xuc774e932005-07-06 13:51:31 -0700384 desc.info = iv;
385
Herbert Xu915e8562005-07-06 13:53:47 -0700386 return crypt_iv_unaligned(&desc, dst, src, nbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387}
388
389static int nocrypt(struct crypto_tfm *tfm,
390 struct scatterlist *dst,
391 struct scatterlist *src,
392 unsigned int nbytes)
393{
394 return -ENOSYS;
395}
396
397static int nocrypt_iv(struct crypto_tfm *tfm,
398 struct scatterlist *dst,
399 struct scatterlist *src,
400 unsigned int nbytes, u8 *iv)
401{
402 return -ENOSYS;
403}
404
405int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags)
406{
407 u32 mode = flags & CRYPTO_TFM_MODE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 tfm->crt_cipher.cit_mode = mode ? mode : CRYPTO_TFM_MODE_ECB;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 return 0;
410}
411
Herbert Xuf28776a2006-08-13 20:58:18 +1000412static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *,
413 const u8 *),
414 struct crypto_tfm *tfm,
415 u8 *dst, const u8 *src)
416{
417 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
418 unsigned int size = crypto_tfm_alg_blocksize(tfm);
419 u8 buffer[size + alignmask];
420 u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
421
422 memcpy(tmp, src, size);
423 fn(tfm, tmp, tmp);
424 memcpy(dst, tmp, size);
425}
426
427static void cipher_encrypt_unaligned(struct crypto_tfm *tfm,
428 u8 *dst, const u8 *src)
429{
430 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
431 struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
432
433 if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
434 cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src);
435 return;
436 }
437
438 cipher->cia_encrypt(tfm, dst, src);
439}
440
441static void cipher_decrypt_unaligned(struct crypto_tfm *tfm,
442 u8 *dst, const u8 *src)
443{
444 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
445 struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
446
447 if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
448 cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src);
449 return;
450 }
451
452 cipher->cia_decrypt(tfm, dst, src);
453}
454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455int crypto_init_cipher_ops(struct crypto_tfm *tfm)
456{
457 int ret = 0;
458 struct cipher_tfm *ops = &tfm->crt_cipher;
Herbert Xuf28776a2006-08-13 20:58:18 +1000459 struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461 ops->cit_setkey = setkey;
Herbert Xuf28776a2006-08-13 20:58:18 +1000462 ops->cit_encrypt_one = crypto_tfm_alg_alignmask(tfm) ?
463 cipher_encrypt_unaligned : cipher->cia_encrypt;
464 ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ?
465 cipher_decrypt_unaligned : cipher->cia_decrypt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467 switch (tfm->crt_cipher.cit_mode) {
468 case CRYPTO_TFM_MODE_ECB:
469 ops->cit_encrypt = ecb_encrypt;
470 ops->cit_decrypt = ecb_decrypt;
Herbert Xudf898202006-07-14 10:42:27 +1000471 ops->cit_encrypt_iv = nocrypt_iv;
472 ops->cit_decrypt_iv = nocrypt_iv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 break;
474
475 case CRYPTO_TFM_MODE_CBC:
476 ops->cit_encrypt = cbc_encrypt;
477 ops->cit_decrypt = cbc_decrypt;
478 ops->cit_encrypt_iv = cbc_encrypt_iv;
479 ops->cit_decrypt_iv = cbc_decrypt_iv;
480 break;
481
482 case CRYPTO_TFM_MODE_CFB:
483 ops->cit_encrypt = nocrypt;
484 ops->cit_decrypt = nocrypt;
485 ops->cit_encrypt_iv = nocrypt_iv;
486 ops->cit_decrypt_iv = nocrypt_iv;
487 break;
488
489 case CRYPTO_TFM_MODE_CTR:
490 ops->cit_encrypt = nocrypt;
491 ops->cit_decrypt = nocrypt;
492 ops->cit_encrypt_iv = nocrypt_iv;
493 ops->cit_decrypt_iv = nocrypt_iv;
494 break;
495
496 default:
497 BUG();
498 }
499
500 if (ops->cit_mode == CRYPTO_TFM_MODE_CBC) {
Herbert Xu9d853c32005-07-15 07:41:31 -0700501 unsigned long align;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700502 unsigned long addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 switch (crypto_tfm_alg_blocksize(tfm)) {
505 case 8:
506 ops->cit_xor_block = xor_64;
507 break;
508
509 case 16:
510 ops->cit_xor_block = xor_128;
511 break;
512
513 default:
514 printk(KERN_WARNING "%s: block size %u not supported\n",
515 crypto_tfm_alg_name(tfm),
516 crypto_tfm_alg_blocksize(tfm));
517 ret = -EINVAL;
518 goto out;
519 }
520
521 ops->cit_ivsize = crypto_tfm_alg_blocksize(tfm);
Herbert Xufbdae9f2005-07-06 13:53:29 -0700522 align = crypto_tfm_alg_alignmask(tfm) + 1;
523 addr = (unsigned long)crypto_tfm_ctx(tfm);
524 addr = ALIGN(addr, align);
525 addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
526 ops->cit_iv = (void *)addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 }
528
529out:
530 return ret;
531}
532
533void crypto_exit_cipher_ops(struct crypto_tfm *tfm)
534{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}