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crypto: sha1 - export sha1_update for reuse

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Export the update function as crypto_sha1_update() to not have the need
to reimplement the same algorithm for each SHA-1 implementation. This
way the generic SHA-1 implementation can be used as fallback for other
implementations that fail to run under certain circumstances, like the
need for an FPU context while executing in IRQ context.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mathias Krause 2011-08-04 20:19:24 +02:00 • committed by Herbert Xu
commit 7c390170b4
2 changed files with 8 additions and 4 deletions
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9
crypto/sha1_generic.c
View file

@ -36,7 +36,7 @@ static int sha1_init(struct shash_desc *desc)
return 0;
}
static int sha1_update(struct shash_desc *desc, const u8 *data,
int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha1_state *sctx = shash_desc_ctx(desc);
@ -71,6 +71,7 @@ static int sha1_update(struct shash_desc *desc, const u8 *data,
return 0;
}
EXPORT_SYMBOL(crypto_sha1_update);
/* Add padding and return the message digest. */
@ -87,10 +88,10 @@ static int sha1_final(struct shash_desc *desc, u8 *out)
/* Pad out to 56 mod 64 */
index = sctx->count & 0x3f;
padlen = (index < 56) ? (56 - index) : ((64+56) - index);
sha1_update(desc, padding, padlen);
crypto_sha1_update(desc, padding, padlen);
/* Append length */
sha1_update(desc, (const u8 *)&bits, sizeof(bits));
crypto_sha1_update(desc, (const u8 *)&bits, sizeof(bits));
/* Store state in digest */
for (i = 0; i < 5; i++)
@ -121,7 +122,7 @@ static int sha1_import(struct shash_desc *desc, const void *in)
static struct shash_alg alg = {
.digestsize = SHA1_DIGEST_SIZE,
.init = sha1_init,
.update = sha1_update,
.update = crypto_sha1_update,
.final = sha1_final,
.export = sha1_export,
.import = sha1_import,

3
include/crypto/sha.h
View file

@ -82,4 +82,7 @@ struct sha512_state {
u8 buf[SHA512_BLOCK_SIZE];
};
extern int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
unsigned int len);
#endif