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crypto: blake2b - simplify key init 

The keyed init writes the key bytes to the input buffer and does an
update. We can do that in two ways: fill the buffer and update
immediatelly. This is what current blake2b_init_key does. Any other
following _update or _final will continue from the updated state.

The other way is to write the key and set the number of bytes to process
at the next _update or _final, lazy evaluation. Which leads to the the
simplified code in this patch.

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 11:20:26 +01:00 committed by Herbert Xu
parent e374969565
commit e87e484d60
1 changed files with 6 additions and 8 deletions
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14
crypto/blake2b_generic.c
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@ -85,8 +85,6 @@ static const u8 blake2b_sigma[12][16] = {
{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
};
static void blake2b_update(struct blake2b_state *S, const void *pin, size_t inlen);
static void blake2b_set_lastnode(struct blake2b_state *S)
{
S->f[1] = (u64)-1;
@ -235,12 +233,12 @@ static int blake2b_init(struct shash_desc *desc)
state->h[0] ^= 0x01010000 | mctx->keylen << 8 | digestsize;
if (mctx->keylen) {
u8 block[BLAKE2B_BLOCKBYTES];
memset(block, 0, BLAKE2B_BLOCKBYTES);
memcpy(block, mctx->key, mctx->keylen);
blake2b_update(state, block, BLAKE2B_BLOCKBYTES);
memzero_explicit(block, BLAKE2B_BLOCKBYTES);
/*
* Prefill the buffer with the key, next call to _update or
* _final will process it
*/
memcpy(state->buf, mctx->key, mctx->keylen);
state->buflen = BLAKE2B_BLOCKBYTES;
}
return 0;
}