aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/ctr.c
diff options
context:
space:
mode:
authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-17 08:34:32 -0500
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-10 16:16:41 -0500
commit5311f248b7764ba8b59e6d477355f766e5609686 (patch)
tree228910c68fc3d29a6bfe82cccfdc042e4003ebd2 /crypto/ctr.c
parent653ebd9c8510a7d647ed23e66e1338f848ebdbab (diff)
[CRYPTO] ctr: Refactor into ctr and rfc3686
As discussed previously, this patch moves the basic CTR functionality into a chainable algorithm called ctr. The IPsec-specific variant of it is now placed on top with the name rfc3686. So ctr(aes) gives a chainable cipher with IV size 16 while the IPsec variant will be called rfc3686(ctr(aes)). This patch also adjusts gcm accordingly. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/ctr.c')
-rw-r--r--crypto/ctr.c334
1 files changed, 206 insertions, 128 deletions
diff --git a/crypto/ctr.c b/crypto/ctr.c
index 57da7d0affcb..1052b318aed2 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -11,6 +11,7 @@
11 */ 11 */
12 12
13#include <crypto/algapi.h> 13#include <crypto/algapi.h>
14#include <crypto/ctr.h>
14#include <linux/err.h> 15#include <linux/err.h>
15#include <linux/init.h> 16#include <linux/init.h>
16#include <linux/kernel.h> 17#include <linux/kernel.h>
@@ -19,16 +20,13 @@
19#include <linux/scatterlist.h> 20#include <linux/scatterlist.h>
20#include <linux/slab.h> 21#include <linux/slab.h>
21 22
22struct ctr_instance_ctx {
23 struct crypto_spawn alg;
24 unsigned int noncesize;
25 unsigned int ivsize;
26 unsigned int countersize;
27};
28
29struct crypto_ctr_ctx { 23struct crypto_ctr_ctx {
30 struct crypto_cipher *child; 24 struct crypto_cipher *child;
31 u8 *nonce; 25};
26
27struct crypto_rfc3686_ctx {
28 struct crypto_blkcipher *child;
29 u8 nonce[CTR_RFC3686_NONCE_SIZE];
32}; 30};
33 31
34static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key, 32static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
@@ -36,18 +34,7 @@ static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
36{ 34{
37 struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(parent); 35 struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(parent);
38 struct crypto_cipher *child = ctx->child; 36 struct crypto_cipher *child = ctx->child;
39 struct ctr_instance_ctx *ictx = 37 int err;
40 crypto_instance_ctx(crypto_tfm_alg_instance(parent));
41 unsigned int noncelen = ictx->noncesize;
42 int err = 0;
43
44 /* the nonce is stored in bytes at end of key */
45 if (keylen < noncelen)
46 return -EINVAL;
47
48 memcpy(ctx->nonce, key + (keylen - noncelen), noncelen);
49
50 keylen -= noncelen;
51 38
52 crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); 39 crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
53 crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) & 40 crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
@@ -60,11 +47,13 @@ static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
60} 47}
61 48
62static void crypto_ctr_crypt_final(struct blkcipher_walk *walk, 49static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
63 struct crypto_cipher *tfm, u8 *ctrblk, 50 struct crypto_cipher *tfm)
64 unsigned int countersize)
65{ 51{
66 unsigned int bsize = crypto_cipher_blocksize(tfm); 52 unsigned int bsize = crypto_cipher_blocksize(tfm);
67 u8 *keystream = ctrblk + bsize; 53 unsigned long alignmask = crypto_cipher_alignmask(tfm);
54 u8 *ctrblk = walk->iv;
55 u8 tmp[bsize + alignmask];
56 u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
68 u8 *src = walk->src.virt.addr; 57 u8 *src = walk->src.virt.addr;
69 u8 *dst = walk->dst.virt.addr; 58 u8 *dst = walk->dst.virt.addr;
70 unsigned int nbytes = walk->nbytes; 59 unsigned int nbytes = walk->nbytes;
@@ -72,15 +61,17 @@ static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
72 crypto_cipher_encrypt_one(tfm, keystream, ctrblk); 61 crypto_cipher_encrypt_one(tfm, keystream, ctrblk);
73 crypto_xor(keystream, src, nbytes); 62 crypto_xor(keystream, src, nbytes);
74 memcpy(dst, keystream, nbytes); 63 memcpy(dst, keystream, nbytes);
64
65 crypto_inc(ctrblk, bsize);
75} 66}
76 67
77static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk, 68static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
78 struct crypto_cipher *tfm, u8 *ctrblk, 69 struct crypto_cipher *tfm)
79 unsigned int countersize)
80{ 70{
81 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = 71 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
82 crypto_cipher_alg(tfm)->cia_encrypt; 72 crypto_cipher_alg(tfm)->cia_encrypt;
83 unsigned int bsize = crypto_cipher_blocksize(tfm); 73 unsigned int bsize = crypto_cipher_blocksize(tfm);
74 u8 *ctrblk = walk->iv;
84 u8 *src = walk->src.virt.addr; 75 u8 *src = walk->src.virt.addr;
85 u8 *dst = walk->dst.virt.addr; 76 u8 *dst = walk->dst.virt.addr;
86 unsigned int nbytes = walk->nbytes; 77 unsigned int nbytes = walk->nbytes;
@@ -91,7 +82,7 @@ static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
91 crypto_xor(dst, src, bsize); 82 crypto_xor(dst, src, bsize);
92 83
93 /* increment counter in counterblock */ 84 /* increment counter in counterblock */
94 crypto_inc(ctrblk + bsize - countersize, countersize); 85 crypto_inc(ctrblk, bsize);
95 86
96 src += bsize; 87 src += bsize;
97 dst += bsize; 88 dst += bsize;
@@ -101,15 +92,17 @@ static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
101} 92}
102 93
103static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk, 94static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
104 struct crypto_cipher *tfm, u8 *ctrblk, 95 struct crypto_cipher *tfm)
105 unsigned int countersize)
106{ 96{
107 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = 97 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
108 crypto_cipher_alg(tfm)->cia_encrypt; 98 crypto_cipher_alg(tfm)->cia_encrypt;
109 unsigned int bsize = crypto_cipher_blocksize(tfm); 99 unsigned int bsize = crypto_cipher_blocksize(tfm);
100 unsigned long alignmask = crypto_cipher_alignmask(tfm);
110 unsigned int nbytes = walk->nbytes; 101 unsigned int nbytes = walk->nbytes;
102 u8 *ctrblk = walk->iv;
111 u8 *src = walk->src.virt.addr; 103 u8 *src = walk->src.virt.addr;
112 u8 *keystream = ctrblk + bsize; 104 u8 tmp[bsize + alignmask];
105 u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
113 106
114 do { 107 do {
115 /* create keystream */ 108 /* create keystream */
@@ -117,7 +110,7 @@ static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
117 crypto_xor(src, keystream, bsize); 110 crypto_xor(src, keystream, bsize);
118 111
119 /* increment counter in counterblock */ 112 /* increment counter in counterblock */
120 crypto_inc(ctrblk + bsize - countersize, countersize); 113 crypto_inc(ctrblk, bsize);
121 114
122 src += bsize; 115 src += bsize;
123 } while ((nbytes -= bsize) >= bsize); 116 } while ((nbytes -= bsize) >= bsize);
@@ -134,41 +127,22 @@ static int crypto_ctr_crypt(struct blkcipher_desc *desc,
134 struct crypto_ctr_ctx *ctx = crypto_blkcipher_ctx(tfm); 127 struct crypto_ctr_ctx *ctx = crypto_blkcipher_ctx(tfm);
135 struct crypto_cipher *child = ctx->child; 128 struct crypto_cipher *child = ctx->child;
136 unsigned int bsize = crypto_cipher_blocksize(child); 129 unsigned int bsize = crypto_cipher_blocksize(child);
137 struct ctr_instance_ctx *ictx =
138 crypto_instance_ctx(crypto_tfm_alg_instance(&tfm->base));
139 unsigned long alignmask = crypto_cipher_alignmask(child) |
140 (__alignof__(u32) - 1);
141 u8 cblk[bsize * 2 + alignmask];
142 u8 *counterblk = (u8 *)ALIGN((unsigned long)cblk, alignmask + 1);
143 int err; 130 int err;
144 131
145 blkcipher_walk_init(&walk, dst, src, nbytes); 132 blkcipher_walk_init(&walk, dst, src, nbytes);
146 err = blkcipher_walk_virt_block(desc, &walk, bsize); 133 err = blkcipher_walk_virt_block(desc, &walk, bsize);
147 134
148 /* set up counter block */
149 memset(counterblk, 0 , bsize);
150 memcpy(counterblk, ctx->nonce, ictx->noncesize);
151 memcpy(counterblk + ictx->noncesize, walk.iv, ictx->ivsize);
152
153 /* initialize counter portion of counter block */
154 crypto_inc(counterblk + bsize - ictx->countersize, ictx->countersize);
155
156 while (walk.nbytes >= bsize) { 135 while (walk.nbytes >= bsize) {
157 if (walk.src.virt.addr == walk.dst.virt.addr) 136 if (walk.src.virt.addr == walk.dst.virt.addr)
158 nbytes = crypto_ctr_crypt_inplace(&walk, child, 137 nbytes = crypto_ctr_crypt_inplace(&walk, child);
159 counterblk,
160 ictx->countersize);
161 else 138 else
162 nbytes = crypto_ctr_crypt_segment(&walk, child, 139 nbytes = crypto_ctr_crypt_segment(&walk, child);
163 counterblk,
164 ictx->countersize);
165 140
166 err = blkcipher_walk_done(desc, &walk, nbytes); 141 err = blkcipher_walk_done(desc, &walk, nbytes);
167 } 142 }
168 143
169 if (walk.nbytes) { 144 if (walk.nbytes) {
170 crypto_ctr_crypt_final(&walk, child, counterblk, 145 crypto_ctr_crypt_final(&walk, child);
171 ictx->countersize);
172 err = blkcipher_walk_done(desc, &walk, 0); 146 err = blkcipher_walk_done(desc, &walk, 0);
173 } 147 }
174 148
@@ -178,15 +152,11 @@ static int crypto_ctr_crypt(struct blkcipher_desc *desc,
178static int crypto_ctr_init_tfm(struct crypto_tfm *tfm) 152static int crypto_ctr_init_tfm(struct crypto_tfm *tfm)
179{ 153{
180 struct crypto_instance *inst = (void *)tfm->__crt_alg; 154 struct crypto_instance *inst = (void *)tfm->__crt_alg;
181 struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst); 155 struct crypto_spawn *spawn = crypto_instance_ctx(inst);
182 struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm); 156 struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
183 struct crypto_cipher *cipher; 157 struct crypto_cipher *cipher;
184 158
185 ctx->nonce = kzalloc(ictx->noncesize, GFP_KERNEL); 159 cipher = crypto_spawn_cipher(spawn);
186 if (!ctx->nonce)
187 return -ENOMEM;
188
189 cipher = crypto_spawn_cipher(&ictx->alg);
190 if (IS_ERR(cipher)) 160 if (IS_ERR(cipher))
191 return PTR_ERR(cipher); 161 return PTR_ERR(cipher);
192 162
@@ -199,7 +169,6 @@ static void crypto_ctr_exit_tfm(struct crypto_tfm *tfm)
199{ 169{
200 struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm); 170 struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
201 171
202 kfree(ctx->nonce);
203 crypto_free_cipher(ctx->child); 172 crypto_free_cipher(ctx->child);
204} 173}
205 174
@@ -207,10 +176,6 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
207{ 176{
208 struct crypto_instance *inst; 177 struct crypto_instance *inst;
209 struct crypto_alg *alg; 178 struct crypto_alg *alg;
210 struct ctr_instance_ctx *ictx;
211 unsigned int noncesize;
212 unsigned int ivsize;
213 unsigned int countersize;
214 int err; 179 int err;
215 180
216 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER); 181 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
@@ -222,71 +187,28 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
222 if (IS_ERR(alg)) 187 if (IS_ERR(alg))
223 return ERR_PTR(PTR_ERR(alg)); 188 return ERR_PTR(PTR_ERR(alg));
224 189
225 err = crypto_attr_u32(tb[2], &noncesize); 190 /* Block size must be >= 4 bytes. */
226 if (err)
227 goto out_put_alg;
228
229 err = crypto_attr_u32(tb[3], &ivsize);
230 if (err)
231 goto out_put_alg;
232
233 err = crypto_attr_u32(tb[4], &countersize);
234 if (err)
235 goto out_put_alg;
236
237 /* verify size of nonce + iv + counter
238 * counter must be >= 4 bytes.
239 */
240 err = -EINVAL; 191 err = -EINVAL;
241 if (((noncesize + ivsize + countersize) < alg->cra_blocksize) || 192 if (alg->cra_blocksize < 4)
242 ((noncesize + ivsize) > alg->cra_blocksize) ||
243 (countersize > alg->cra_blocksize) || (countersize < 4))
244 goto out_put_alg; 193 goto out_put_alg;
245 194
246 /* If this is false we'd fail the alignment of crypto_inc. */ 195 /* If this is false we'd fail the alignment of crypto_inc. */
247 if ((alg->cra_blocksize - countersize) % 4) 196 if (alg->cra_blocksize % 4)
248 goto out_put_alg; 197 goto out_put_alg;
249 198
250 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); 199 inst = crypto_alloc_instance("ctr", alg);
251 err = -ENOMEM; 200 if (IS_ERR(inst))
252 if (!inst) 201 goto out;
253 goto out_put_alg;
254
255 err = -ENAMETOOLONG;
256 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
257 "ctr(%s,%u,%u,%u)", alg->cra_name, noncesize,
258 ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
259 goto err_free_inst;
260 }
261
262 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
263 "ctr(%s,%u,%u,%u)", alg->cra_driver_name, noncesize,
264 ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
265 goto err_free_inst;
266 }
267
268 ictx = crypto_instance_ctx(inst);
269 ictx->noncesize = noncesize;
270 ictx->ivsize = ivsize;
271 ictx->countersize = countersize;
272
273 err = crypto_init_spawn(&ictx->alg, alg, inst,
274 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
275 if (err)
276 goto err_free_inst;
277 202
278 err = 0;
279 inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER; 203 inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
280 inst->alg.cra_priority = alg->cra_priority; 204 inst->alg.cra_priority = alg->cra_priority;
281 inst->alg.cra_blocksize = 1; 205 inst->alg.cra_blocksize = 1;
282 inst->alg.cra_alignmask = alg->cra_alignmask | (__alignof__(u32) - 1); 206 inst->alg.cra_alignmask = alg->cra_alignmask | (__alignof__(u32) - 1);
283 inst->alg.cra_type = &crypto_blkcipher_type; 207 inst->alg.cra_type = &crypto_blkcipher_type;
284 208
285 inst->alg.cra_blkcipher.ivsize = ivsize; 209 inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
286 inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize 210 inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
287 + noncesize; 211 inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
288 inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize
289 + noncesize;
290 212
291 inst->alg.cra_ctxsize = sizeof(struct crypto_ctr_ctx); 213 inst->alg.cra_ctxsize = sizeof(struct crypto_ctr_ctx);
292 214
@@ -297,24 +219,18 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
297 inst->alg.cra_blkcipher.encrypt = crypto_ctr_crypt; 219 inst->alg.cra_blkcipher.encrypt = crypto_ctr_crypt;
298 inst->alg.cra_blkcipher.decrypt = crypto_ctr_crypt; 220 inst->alg.cra_blkcipher.decrypt = crypto_ctr_crypt;
299 221
300err_free_inst: 222out:
301 if (err)
302 kfree(inst);
303
304out_put_alg:
305 crypto_mod_put(alg); 223 crypto_mod_put(alg);
306
307 if (err)
308 inst = ERR_PTR(err);
309
310 return inst; 224 return inst;
225
226out_put_alg:
227 inst = ERR_PTR(err);
228 goto out;
311} 229}
312 230
313static void crypto_ctr_free(struct crypto_instance *inst) 231static void crypto_ctr_free(struct crypto_instance *inst)
314{ 232{
315 struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst); 233 crypto_drop_spawn(crypto_instance_ctx(inst));
316
317 crypto_drop_spawn(&ictx->alg);
318 kfree(inst); 234 kfree(inst);
319} 235}
320 236
@@ -325,13 +241,174 @@ static struct crypto_template crypto_ctr_tmpl = {
325 .module = THIS_MODULE, 241 .module = THIS_MODULE,
326}; 242};
327 243
244static int crypto_rfc3686_setkey(struct crypto_tfm *parent, const u8 *key,
245 unsigned int keylen)
246{
247 struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(parent);
248 struct crypto_blkcipher *child = ctx->child;
249 int err;
250
251 /* the nonce is stored in bytes at end of key */
252 if (keylen < CTR_RFC3686_NONCE_SIZE)
253 return -EINVAL;
254
255 memcpy(ctx->nonce, key + (keylen - CTR_RFC3686_NONCE_SIZE),
256 CTR_RFC3686_NONCE_SIZE);
257
258 keylen -= CTR_RFC3686_NONCE_SIZE;
259
260 crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
261 crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
262 CRYPTO_TFM_REQ_MASK);
263 err = crypto_blkcipher_setkey(child, key, keylen);
264 crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
265 CRYPTO_TFM_RES_MASK);
266
267 return err;
268}
269
270static int crypto_rfc3686_crypt(struct blkcipher_desc *desc,
271 struct scatterlist *dst,
272 struct scatterlist *src, unsigned int nbytes)
273{
274 struct crypto_blkcipher *tfm = desc->tfm;
275 struct crypto_rfc3686_ctx *ctx = crypto_blkcipher_ctx(tfm);
276 struct crypto_blkcipher *child = ctx->child;
277 unsigned long alignmask = crypto_blkcipher_alignmask(tfm);
278 u8 ivblk[CTR_RFC3686_BLOCK_SIZE + alignmask];
279 u8 *iv = PTR_ALIGN(ivblk + 0, alignmask + 1);
280 u8 *info = desc->info;
281 int err;
282
283 /* set up counter block */
284 memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
285 memcpy(iv + CTR_RFC3686_NONCE_SIZE, info, CTR_RFC3686_IV_SIZE);
286
287 /* initialize counter portion of counter block */
288 *(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
289 cpu_to_be32(1);
290
291 desc->tfm = child;
292 desc->info = iv;
293 err = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
294 desc->tfm = tfm;
295 desc->info = info;
296
297 return err;
298}
299
300static int crypto_rfc3686_init_tfm(struct crypto_tfm *tfm)
301{
302 struct crypto_instance *inst = (void *)tfm->__crt_alg;
303 struct crypto_spawn *spawn = crypto_instance_ctx(inst);
304 struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
305 struct crypto_blkcipher *cipher;
306
307 cipher = crypto_spawn_blkcipher(spawn);
308 if (IS_ERR(cipher))
309 return PTR_ERR(cipher);
310
311 ctx->child = cipher;
312
313 return 0;
314}
315
316static void crypto_rfc3686_exit_tfm(struct crypto_tfm *tfm)
317{
318 struct crypto_rfc3686_ctx *ctx = crypto_tfm_ctx(tfm);
319
320 crypto_free_blkcipher(ctx->child);
321}
322
323static struct crypto_instance *crypto_rfc3686_alloc(struct rtattr **tb)
324{
325 struct crypto_instance *inst;
326 struct crypto_alg *alg;
327 int err;
328
329 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
330 if (err)
331 return ERR_PTR(err);
332
333 alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_BLKCIPHER,
334 CRYPTO_ALG_TYPE_MASK);
335 err = PTR_ERR(alg);
336 if (IS_ERR(alg))
337 return ERR_PTR(err);
338
339 /* We only support 16-byte blocks. */
340 err = -EINVAL;
341 if (alg->cra_blkcipher.ivsize != CTR_RFC3686_BLOCK_SIZE)
342 goto out_put_alg;
343
344 /* Not a stream cipher? */
345 if (alg->cra_blocksize != 1)
346 goto out_put_alg;
347
348 inst = crypto_alloc_instance("rfc3686", alg);
349 if (IS_ERR(inst))
350 goto out;
351
352 inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
353 inst->alg.cra_priority = alg->cra_priority;
354 inst->alg.cra_blocksize = 1;
355 inst->alg.cra_alignmask = alg->cra_alignmask;
356 inst->alg.cra_type = &crypto_blkcipher_type;
357
358 inst->alg.cra_blkcipher.ivsize = CTR_RFC3686_IV_SIZE;
359 inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize
360 + CTR_RFC3686_NONCE_SIZE;
361 inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize
362 + CTR_RFC3686_NONCE_SIZE;
363
364 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx);
365
366 inst->alg.cra_init = crypto_rfc3686_init_tfm;
367 inst->alg.cra_exit = crypto_rfc3686_exit_tfm;
368
369 inst->alg.cra_blkcipher.setkey = crypto_rfc3686_setkey;
370 inst->alg.cra_blkcipher.encrypt = crypto_rfc3686_crypt;
371 inst->alg.cra_blkcipher.decrypt = crypto_rfc3686_crypt;
372
373out:
374 crypto_mod_put(alg);
375 return inst;
376
377out_put_alg:
378 inst = ERR_PTR(err);
379 goto out;
380}
381
382static struct crypto_template crypto_rfc3686_tmpl = {
383 .name = "rfc3686",
384 .alloc = crypto_rfc3686_alloc,
385 .free = crypto_ctr_free,
386 .module = THIS_MODULE,
387};
388
328static int __init crypto_ctr_module_init(void) 389static int __init crypto_ctr_module_init(void)
329{ 390{
330 return crypto_register_template(&crypto_ctr_tmpl); 391 int err;
392
393 err = crypto_register_template(&crypto_ctr_tmpl);
394 if (err)
395 goto out;
396
397 err = crypto_register_template(&crypto_rfc3686_tmpl);
398 if (err)
399 goto out_drop_ctr;
400
401out:
402 return err;
403
404out_drop_ctr:
405 crypto_unregister_template(&crypto_ctr_tmpl);
406 goto out;
331} 407}
332 408
333static void __exit crypto_ctr_module_exit(void) 409static void __exit crypto_ctr_module_exit(void)
334{ 410{
411 crypto_unregister_template(&crypto_rfc3686_tmpl);
335 crypto_unregister_template(&crypto_ctr_tmpl); 412 crypto_unregister_template(&crypto_ctr_tmpl);
336} 413}
337 414
@@ -340,3 +417,4 @@ module_exit(crypto_ctr_module_exit);
340 417
341MODULE_LICENSE("GPL"); 418MODULE_LICENSE("GPL");
342MODULE_DESCRIPTION("CTR Counter block mode"); 419MODULE_DESCRIPTION("CTR Counter block mode");
420MODULE_ALIAS("rfc3686");