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crypto: blake2b - merge _final implementation to callback 

blake2b_final is called only once, merge it to the crypto API callback
and simplify. This avoids the temporary buffer and swaps the bytes of
internal buffer.

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
David Sterba 2019-11-12 11:20:24 +01:00 committed by Herbert Xu
parent c7351845b2
commit 086db43b5a
1 changed files with 17 additions and 25 deletions
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42
crypto/blake2b_generic.c
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@ -276,25 +276,6 @@ static void blake2b_update(struct blake2b_state *S, const void *pin, size_t inle
} }
} }
static void blake2b_final(struct blake2b_state *S, void *out, size_t outlen)
{
u8 buffer[BLAKE2B_OUTBYTES] = {0};
size_t i;
blake2b_increment_counter(S, S->buflen);
blake2b_set_lastblock(S);
/* Padding */
memset(S->buf + S->buflen, 0, BLAKE2B_BLOCKBYTES - S->buflen);
blake2b_compress(S, S->buf);
/* Output full hash to temp buffer */
for (i = 0; i < 8; ++i)
put_unaligned_le64(S->h[i], buffer + sizeof(S->h[i]) * i);
memcpy(out, buffer, S->outlen);
memzero_explicit(buffer, sizeof(buffer));
}
struct digest_tfm_ctx { struct digest_tfm_ctx {
u8 key[BLAKE2B_KEYBYTES]; u8 key[BLAKE2B_KEYBYTES];
unsigned int keylen; unsigned int keylen;
@ -338,12 +319,23 @@ static int digest_update(struct shash_desc *desc, const u8 *data,
return 0; return 0;
} }
static int digest_final(struct shash_desc *desc, u8 *out) static int blake2b_final(struct shash_desc *desc, u8 *out)
{ {
struct blake2b_state *state = shash_desc_ctx(desc); struct blake2b_state *state = shash_desc_ctx(desc);
const int digestsize = crypto_shash_digestsize(desc->tfm); const int digestsize = crypto_shash_digestsize(desc->tfm);
size_t i;
blake2b_final(state, out, digestsize); blake2b_increment_counter(state, state->buflen);
blake2b_set_lastblock(state);
/* Padding */
memset(state->buf + state->buflen, 0, BLAKE2B_BLOCKBYTES - state->buflen);
blake2b_compress(state, state->buf);
/* Avoid temporary buffer and switch the internal output to LE order */
for (i = 0; i < ARRAY_SIZE(state->h); i++)
__cpu_to_le64s(&state->h[i]);
memcpy(out, state->h, digestsize);
return 0; return 0;
} }
@ -360,7 +352,7 @@ static struct shash_alg blake2b_algs[] = {
.setkey = digest_setkey, .setkey = digest_setkey,
.init = digest_init, .init = digest_init,
.update = digest_update, .update = digest_update,
.final = digest_final, .final = blake2b_final,
.descsize = sizeof(struct blake2b_state), .descsize = sizeof(struct blake2b_state),
}, { }, {
.base.cra_name = "blake2b-256", .base.cra_name = "blake2b-256",
@ -374,7 +366,7 @@ static struct shash_alg blake2b_algs[] = {
.setkey = digest_setkey, .setkey = digest_setkey,
.init = digest_init, .init = digest_init,
.update = digest_update, .update = digest_update,
.final = digest_final, .final = blake2b_final,
.descsize = sizeof(struct blake2b_state), .descsize = sizeof(struct blake2b_state),
}, { }, {
.base.cra_name = "blake2b-384", .base.cra_name = "blake2b-384",
@ -388,7 +380,7 @@ static struct shash_alg blake2b_algs[] = {
.setkey = digest_setkey, .setkey = digest_setkey,
.init = digest_init, .init = digest_init,
.update = digest_update, .update = digest_update,
.final = digest_final, .final = blake2b_final,
.descsize = sizeof(struct blake2b_state), .descsize = sizeof(struct blake2b_state),
}, { }, {
.base.cra_name = "blake2b-512", .base.cra_name = "blake2b-512",
@ -402,7 +394,7 @@ static struct shash_alg blake2b_algs[] = {
.setkey = digest_setkey, .setkey = digest_setkey,
.init = digest_init, .init = digest_init,
.update = digest_update, .update = digest_update,
.final = digest_final, .final = blake2b_final,
.descsize = sizeof(struct blake2b_state), .descsize = sizeof(struct blake2b_state),
} }
}; };