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authorHerbert Xu <herbert@gondor.apana.org.au>2008-08-31 04:52:18 -0400
committerHerbert Xu <herbert@gondor.apana.org.au>2008-12-24 19:01:28 -0500
commit3b2f6df08258e2875f42bd630eece7e7241a053b (patch)
treef46e989b103580a6286d644b3c88892188339e19 /crypto
parent7b5a080b3c46f0cac71c0d0262634c6517d4ee4f (diff)
crypto: hash - Export shash through ahash
This patch allows shash algorithms to be used through the ahash interface. This is required before we can convert digest algorithms over to shash. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/shash.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/crypto/shash.c b/crypto/shash.c
index 82ec4bd8d2f5..3f4c713a21ea 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -10,6 +10,7 @@
10 * 10 *
11 */ 11 */
12 12
13#include <crypto/scatterwalk.h>
13#include <crypto/internal/hash.h> 14#include <crypto/internal/hash.h>
14#include <linux/err.h> 15#include <linux/err.h>
15#include <linux/kernel.h> 16#include <linux/kernel.h>
@@ -17,11 +18,15 @@
17#include <linux/slab.h> 18#include <linux/slab.h>
18#include <linux/seq_file.h> 19#include <linux/seq_file.h>
19 20
21static const struct crypto_type crypto_shash_type;
22
20static inline struct crypto_shash *__crypto_shash_cast(struct crypto_tfm *tfm) 23static inline struct crypto_shash *__crypto_shash_cast(struct crypto_tfm *tfm)
21{ 24{
22 return container_of(tfm, struct crypto_shash, base); 25 return container_of(tfm, struct crypto_shash, base);
23} 26}
24 27
28#include "internal.h"
29
25static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, 30static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
26 unsigned int keylen) 31 unsigned int keylen)
27{ 32{
@@ -167,6 +172,142 @@ int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
167} 172}
168EXPORT_SYMBOL_GPL(crypto_shash_digest); 173EXPORT_SYMBOL_GPL(crypto_shash_digest);
169 174
175static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
176 unsigned int keylen)
177{
178 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
179
180 return crypto_shash_setkey(*ctx, key, keylen);
181}
182
183static int shash_async_init(struct ahash_request *req)
184{
185 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
186 struct shash_desc *desc = ahash_request_ctx(req);
187
188 desc->tfm = *ctx;
189 desc->flags = req->base.flags;
190
191 return crypto_shash_init(desc);
192}
193
194static int shash_async_update(struct ahash_request *req)
195{
196 struct shash_desc *desc = ahash_request_ctx(req);
197 struct crypto_hash_walk walk;
198 int nbytes;
199
200 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
201 nbytes = crypto_hash_walk_done(&walk, nbytes))
202 nbytes = crypto_shash_update(desc, walk.data, nbytes);
203
204 return nbytes;
205}
206
207static int shash_async_final(struct ahash_request *req)
208{
209 return crypto_shash_final(ahash_request_ctx(req), req->result);
210}
211
212static int shash_async_digest(struct ahash_request *req)
213{
214 struct scatterlist *sg = req->src;
215 unsigned int offset = sg->offset;
216 unsigned int nbytes = req->nbytes;
217 int err;
218
219 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
220 struct crypto_shash **ctx =
221 crypto_ahash_ctx(crypto_ahash_reqtfm(req));
222 struct shash_desc *desc = ahash_request_ctx(req);
223 void *data;
224
225 desc->tfm = *ctx;
226 desc->flags = req->base.flags;
227
228 data = crypto_kmap(sg_page(sg), 0);
229 err = crypto_shash_digest(desc, data + offset, nbytes,
230 req->result);
231 crypto_kunmap(data, 0);
232 crypto_yield(desc->flags);
233 goto out;
234 }
235
236 err = shash_async_init(req);
237 if (err)
238 goto out;
239
240 err = shash_async_update(req);
241 if (err)
242 goto out;
243
244 err = shash_async_final(req);
245
246out:
247 return err;
248}
249
250static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
251{
252 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
253
254 crypto_free_shash(*ctx);
255}
256
257static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
258{
259 struct crypto_alg *calg = tfm->__crt_alg;
260 struct shash_alg *alg = __crypto_shash_alg(calg);
261 struct ahash_tfm *crt = &tfm->crt_ahash;
262 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
263 struct crypto_shash *shash;
264
265 if (!crypto_mod_get(calg))
266 return -EAGAIN;
267
268 shash = __crypto_shash_cast(crypto_create_tfm(
269 calg, &crypto_shash_type));
270 if (IS_ERR(shash)) {
271 crypto_mod_put(calg);
272 return PTR_ERR(shash);
273 }
274
275 *ctx = shash;
276 tfm->exit = crypto_exit_shash_ops_async;
277
278 crt->init = shash_async_init;
279 crt->update = shash_async_update;
280 crt->final = shash_async_final;
281 crt->digest = shash_async_digest;
282 crt->setkey = shash_async_setkey;
283
284 crt->digestsize = alg->digestsize;
285 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
286
287 return 0;
288}
289
290static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
291{
292 switch (mask & CRYPTO_ALG_TYPE_MASK) {
293 case CRYPTO_ALG_TYPE_AHASH_MASK:
294 return crypto_init_shash_ops_async(tfm);
295 }
296
297 return -EINVAL;
298}
299
300static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
301 u32 mask)
302{
303 switch (mask & CRYPTO_ALG_TYPE_MASK) {
304 case CRYPTO_ALG_TYPE_AHASH_MASK:
305 return sizeof(struct crypto_shash *);
306 }
307
308 return 0;
309}
310
170static int crypto_shash_init_tfm(struct crypto_tfm *tfm, 311static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
171 const struct crypto_type *frontend) 312 const struct crypto_type *frontend)
172{ 313{
@@ -194,7 +335,9 @@ static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
194} 335}
195 336
196static const struct crypto_type crypto_shash_type = { 337static const struct crypto_type crypto_shash_type = {
338 .ctxsize = crypto_shash_ctxsize,
197 .extsize = crypto_shash_extsize, 339 .extsize = crypto_shash_extsize,
340 .init = crypto_init_shash_ops,
198 .init_tfm = crypto_shash_init_tfm, 341 .init_tfm = crypto_shash_init_tfm,
199#ifdef CONFIG_PROC_FS 342#ifdef CONFIG_PROC_FS
200 .show = crypto_shash_show, 343 .show = crypto_shash_show,