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crypto: sha512_generic - Use 64-bit counters

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This patch replaces the 32-bit counters in sha512_generic with
64-bit counters.  It also switches the bit count to the simpler
byte count.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2009-07-22 12:22:43 +08:00
parent 1f38ad8389
commit 13887ed688
2 changed files with 13 additions and 19 deletions
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26
crypto/sha512_generic.c
View file

@ -144,7 +144,7 @@ sha512_init(struct shash_desc *desc)
sctx->state[5] = SHA512_H5;
sctx->state[6] = SHA512_H6;
sctx->state[7] = SHA512_H7;
sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
sctx->count[0] = sctx->count[1] = 0;
return 0;
}
@ -161,7 +161,7 @@ sha384_init(struct shash_desc *desc)
sctx->state[5] = SHA384_H5;
sctx->state[6] = SHA384_H6;
sctx->state[7] = SHA384_H7;
sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
sctx->count[0] = sctx->count[1] = 0;
return 0;
}
@ -174,15 +174,11 @@ sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len)
unsigned int i, index, part_len;
/* Compute number of bytes mod 128 */
index = (unsigned int)((sctx->count[0] >> 3) & 0x7F);
index = sctx->count[0] & 0x7f;
/* Update number of bits */
if ((sctx->count[0] += (len << 3)) < (len << 3)) {
if ((sctx->count[1] += 1) < 1)
if ((sctx->count[2] += 1) < 1)
sctx->count[3]++;
sctx->count[1] += (len >> 29);
}
/* Update number of bytes */
if (!(sctx->count[0] += len))
sctx->count[1]++;
part_len = 128 - index;
@ -211,18 +207,16 @@ sha512_final(struct shash_desc *desc, u8 *hash)
struct sha512_state *sctx = shash_desc_ctx(desc);
static u8 padding[128] = { 0x80, };
__be64 *dst = (__be64 *)hash;
__be32 bits[4];
__be64 bits[2];
unsigned int index, pad_len;
int i;
/* Save number of bits */
bits[3] = cpu_to_be32(sctx->count[0]);
bits[2] = cpu_to_be32(sctx->count[1]);
bits[1] = cpu_to_be32(sctx->count[2]);
bits[0] = cpu_to_be32(sctx->count[3]);
bits[1] = cpu_to_be64(sctx->count[0] << 3);
bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
/* Pad out to 112 mod 128. */
index = (sctx->count[0] >> 3) & 0x7f;
index = sctx->count[0] & 0x7f;
pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
sha512_update(desc, padding, pad_len);

6
include/crypto/sha.h
View file

@ -77,9 +77,9 @@ struct sha256_state {
};
struct sha512_state {
u64 state[8];
u32 count[4];
u8 buf[128];
u64 count[2];
u64 state[SHA512_DIGEST_SIZE / 8];
u8 buf[SHA512_BLOCK_SIZE];
};
#endif