Commit 7d2f5b0c authored by Hans de Goede's avatar Hans de Goede Committed by Herbert Xu
Browse files

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: default avatarEric Biggers <ebiggers@kernel.org>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 01d3aee8

include/crypto/sha256.h

+5 −0
Original line number Diff line number Diff line
@@ -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 */

lib/crypto/sha256.c

+35 −2
Original line number Diff line number Diff line
@@ -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);

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