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author | Nicolas Pitre <nico@cam.org> | 2005-11-13 10:47:20 +1100 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2006-01-09 14:15:41 -0800 |
commit | cfa8d17cc836905ad174fd924701b352585d62f1 (patch) | |
tree | 6c966440661a678aea2082cf72c1bee0886a0a57 /crypto | |
parent | c8a19c91b5b488fed8cce04200a84c6a35c0bf0c (diff) | |
download | kernel_samsung_smdk4412-cfa8d17cc836905ad174fd924701b352585d62f1.zip kernel_samsung_smdk4412-cfa8d17cc836905ad174fd924701b352585d62f1.tar.gz kernel_samsung_smdk4412-cfa8d17cc836905ad174fd924701b352585d62f1.tar.bz2 |
[CRYPTO] sha1: Avoid useless memcpy()
The current code unconditionally copy the first block for every call to
sha1_update(). This can be avoided if there is no pending partial block.
This is always the case on the first call to sha1_update() (if the length
is >= 64 of course.
Furthermore, temp does need to be called if sha_transform is never invoked.
Also consolidate the sha_transform calls into one to reduce code size.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r-- | crypto/sha1.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/crypto/sha1.c b/crypto/sha1.c index c686e78..292dcc1 100644 --- a/crypto/sha1.c +++ b/crypto/sha1.c @@ -50,22 +50,31 @@ static void sha1_update(void *ctx, const u8 *data, unsigned int len) { struct sha1_ctx *sctx = ctx; unsigned int i, j; - u32 temp[SHA_WORKSPACE_WORDS]; + const u8 *src; j = (sctx->count >> 3) & 0x3f; sctx->count += len << 3; + i = 0; + src = data; if ((j + len) > 63) { - memcpy(&sctx->buffer[j], data, (i = 64-j)); - sha_transform(sctx->state, sctx->buffer, temp); - for ( ; i + 63 < len; i += 64) { - sha_transform(sctx->state, &data[i], temp); + u32 temp[SHA_WORKSPACE_WORDS]; + + if (j) { + memcpy(&sctx->buffer[j], data, (i = 64-j)); + src = sctx->buffer; } + + do { + sha_transform(sctx->state, src, temp); + i += 64; + src = &data[i]; + } while (i + 63 < len); + + memset(temp, 0, sizeof(temp)); j = 0; } - else i = 0; - memset(temp, 0, sizeof(temp)); - memcpy(&sctx->buffer[j], &data[i], len - i); + memcpy(&sctx->buffer[j], src, len - i); } |