Commit 7c390170 authored by Mathias Krause's avatar Mathias Krause Committed by Herbert Xu
Browse files

crypto: sha1 - export sha1_update for reuse 



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: default avatarMathias Krause <minipli@googlemail.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent b64dc04b

crypto/sha1_generic.c

+5 −4
Original line number Diff line number Diff line
@@ -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,

include/crypto/sha.h

+3 −0
Original line number Diff line number Diff line
@@ -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

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