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crypto: salsa20-generic - use crypto_xor_cpy()

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In salsa20_docrypt(), use crypto_xor_cpy() instead of crypto_xor().
This avoids having to memcpy() the src buffer to the dst buffer.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-03-14 21:21:28 -07:00 committed by Herbert Xu
parent 29d97dec22
commit f6fff17072
1 changed files with 4 additions and 5 deletions
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9
crypto/salsa20_generic.c
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@ -86,18 +86,17 @@ static void salsa20_docrypt(u32 *state, u8 *dst, const u8 *src,
{
__le32 stream[SALSA20_BLOCK_SIZE / sizeof(__le32)];
if (dst != src)
memcpy(dst, src, bytes);
while (bytes >= SALSA20_BLOCK_SIZE) {
salsa20_block(state, stream);
crypto_xor(dst, (const u8 *)stream, SALSA20_BLOCK_SIZE);
crypto_xor_cpy(dst, src, (const u8 *)stream,
SALSA20_BLOCK_SIZE);
bytes -= SALSA20_BLOCK_SIZE;
dst += SALSA20_BLOCK_SIZE;
src += SALSA20_BLOCK_SIZE;
}
if (bytes) {
salsa20_block(state, stream);
crypto_xor(dst, (const u8 *)stream, bytes);
crypto_xor_cpy(dst, src, (const u8 *)stream, bytes);
}
}