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authorHerbert Xu <herbert@gondor.apana.org.au>2008-08-31 18:52:18 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2008-12-25 11:01:28 +1100
commit3b2f6df08258e2875f42bd630eece7e7241a053b (patch)
treef46e989b103580a6286d644b3c88892188339e19 /crypto
parent7b5a080b3c46f0cac71c0d0262634c6517d4ee4f (diff)
downloadconfigs-3b2f6df08258e2875f42bd630eece7e7241a053b.tar.gz
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 82ec4bd8d2f..3f4c713a21e 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -10,6 +10,7 @@
*
*/
+#include <crypto/scatterwalk.h>
#include <crypto/internal/hash.h>
#include <linux/err.h>
#include <linux/kernel.h>
@@ -17,11 +18,15 @@
#include <linux/slab.h>
#include <linux/seq_file.h>
+static const struct crypto_type crypto_shash_type;
+
static inline struct crypto_shash *__crypto_shash_cast(struct crypto_tfm *tfm)
{
return container_of(tfm, struct crypto_shash, base);
}
+#include "internal.h"
+
static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
@@ -167,6 +172,142 @@ int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
}
EXPORT_SYMBOL_GPL(crypto_shash_digest);
+static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
+
+ return crypto_shash_setkey(*ctx, key, keylen);
+}
+
+static int shash_async_init(struct ahash_request *req)
+{
+ struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+ struct shash_desc *desc = ahash_request_ctx(req);
+
+ desc->tfm = *ctx;
+ desc->flags = req->base.flags;
+
+ return crypto_shash_init(desc);
+}
+
+static int shash_async_update(struct ahash_request *req)
+{
+ struct shash_desc *desc = ahash_request_ctx(req);
+ struct crypto_hash_walk walk;
+ int nbytes;
+
+ for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
+ nbytes = crypto_hash_walk_done(&walk, nbytes))
+ nbytes = crypto_shash_update(desc, walk.data, nbytes);
+
+ return nbytes;
+}
+
+static int shash_async_final(struct ahash_request *req)
+{
+ return crypto_shash_final(ahash_request_ctx(req), req->result);
+}
+
+static int shash_async_digest(struct ahash_request *req)
+{
+ struct scatterlist *sg = req->src;
+ unsigned int offset = sg->offset;
+ unsigned int nbytes = req->nbytes;
+ int err;
+
+ if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
+ struct crypto_shash **ctx =
+ crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+ struct shash_desc *desc = ahash_request_ctx(req);
+ void *data;
+
+ desc->tfm = *ctx;
+ desc->flags = req->base.flags;
+
+ data = crypto_kmap(sg_page(sg), 0);
+ err = crypto_shash_digest(desc, data + offset, nbytes,
+ req->result);
+ crypto_kunmap(data, 0);
+ crypto_yield(desc->flags);
+ goto out;
+ }
+
+ err = shash_async_init(req);
+ if (err)
+ goto out;
+
+ err = shash_async_update(req);
+ if (err)
+ goto out;
+
+ err = shash_async_final(req);
+
+out:
+ return err;
+}
+
+static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
+{
+ struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_shash(*ctx);
+}
+
+static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
+{
+ struct crypto_alg *calg = tfm->__crt_alg;
+ struct shash_alg *alg = __crypto_shash_alg(calg);
+ struct ahash_tfm *crt = &tfm->crt_ahash;
+ struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
+ struct crypto_shash *shash;
+
+ if (!crypto_mod_get(calg))
+ return -EAGAIN;
+
+ shash = __crypto_shash_cast(crypto_create_tfm(
+ calg, &crypto_shash_type));
+ if (IS_ERR(shash)) {
+ crypto_mod_put(calg);
+ return PTR_ERR(shash);
+ }
+
+ *ctx = shash;
+ tfm->exit = crypto_exit_shash_ops_async;
+
+ crt->init = shash_async_init;
+ crt->update = shash_async_update;
+ crt->final = shash_async_final;
+ crt->digest = shash_async_digest;
+ crt->setkey = shash_async_setkey;
+
+ crt->digestsize = alg->digestsize;
+ crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
+
+ return 0;
+}
+
+static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+ switch (mask & CRYPTO_ALG_TYPE_MASK) {
+ case CRYPTO_ALG_TYPE_AHASH_MASK:
+ return crypto_init_shash_ops_async(tfm);
+ }
+
+ return -EINVAL;
+}
+
+static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
+ u32 mask)
+{
+ switch (mask & CRYPTO_ALG_TYPE_MASK) {
+ case CRYPTO_ALG_TYPE_AHASH_MASK:
+ return sizeof(struct crypto_shash *);
+ }
+
+ return 0;
+}
+
static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
const struct crypto_type *frontend)
{
@@ -194,7 +335,9 @@ static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
}
static const struct crypto_type crypto_shash_type = {
+ .ctxsize = crypto_shash_ctxsize,
.extsize = crypto_shash_extsize,
+ .init = crypto_init_shash_ops,
.init_tfm = crypto_shash_init_tfm,
#ifdef CONFIG_PROC_FS
.show = crypto_shash_show,