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-rw-r--r--crypto/sha1.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/crypto/sha1.c b/crypto/sha1.c
index c686e7826174..292dcc13ff92 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);
}