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crypto: sha256 - Add sha224 support to sha256 library code 

Add sha224 support to the lib/crypto/sha256 library code. This will allow
us to replace both the sha256 and sha224 parts of crypto/sha256_generic.c
when we remove the code duplication in further patches in this series.

Suggested-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Hans de Goede 2019-08-17 16:24:34 +02:00 committed by Herbert Xu
parent 01d3aee866
commit 7d2f5b0c43
2 changed files with 40 additions and 2 deletions
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5
include/crypto/sha256.h
View File

@ -26,4 +26,9 @@ extern int sha256_update(struct sha256_state *sctx, const u8 *input,
unsigned int length);
extern int sha256_final(struct sha256_state *sctx, u8 *hash);
extern int sha224_init(struct sha256_state *sctx);
extern int sha224_update(struct sha256_state *sctx, const u8 *input,
unsigned int length);
extern int sha224_final(struct sha256_state *sctx, u8 *hash);
#endif /* SHA256_H */

37
lib/crypto/sha256.c
View File

@ -221,6 +221,22 @@ int sha256_init(struct sha256_state *sctx)
}
EXPORT_SYMBOL(sha256_init);
int sha224_init(struct sha256_state *sctx)
{
sctx->state[0] = SHA224_H0;
sctx->state[1] = SHA224_H1;
sctx->state[2] = SHA224_H2;
sctx->state[3] = SHA224_H3;
sctx->state[4] = SHA224_H4;
sctx->state[5] = SHA224_H5;
sctx->state[6] = SHA224_H6;
sctx->state[7] = SHA224_H7;
sctx->count = 0;
return 0;
}
EXPORT_SYMBOL(sha224_init);
int sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
{
unsigned int partial, done;
@ -252,7 +268,13 @@ int sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
}
EXPORT_SYMBOL(sha256_update);
int sha256_final(struct sha256_state *sctx, u8 *out)
int sha224_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
{
return sha256_update(sctx, data, len);
}
EXPORT_SYMBOL(sha224_update);
static int __sha256_final(struct sha256_state *sctx, u8 *out, int digest_words)
{
__be32 *dst = (__be32 *)out;
__be64 bits;
@ -272,7 +294,7 @@ int sha256_final(struct sha256_state *sctx, u8 *out)
sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
/* Store state in digest */
for (i = 0; i < 8; i++)
for (i = 0; i < digest_words; i++)
put_unaligned_be32(sctx->state[i], &dst[i]);
/* Zeroize sensitive information. */
@ -280,4 +302,15 @@ int sha256_final(struct sha256_state *sctx, u8 *out)
return 0;
}
int sha256_final(struct sha256_state *sctx, u8 *out)
{
return __sha256_final(sctx, out, 8);
}
EXPORT_SYMBOL(sha256_final);
int sha224_final(struct sha256_state *sctx, u8 *out)
{
return __sha256_final(sctx, out, 7);
}
EXPORT_SYMBOL(sha224_final);