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| author | Eric Biggers <ebiggers@google.com> | 2019-03-14 21:21:28 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-03-22 20:57:28 +0800 |
| commit | f6fff17072232480ef471eae80a22b66b1dd8b7a (patch) | |
| tree | 798544822b28f3eb3d1d59699b34e280f30440e0 /crypto/salsa20_generic.c | |
| parent | 29d97dec22dde5d2c4ccb23c50a11e94a5911861 (diff) | |
| download | lwn-f6fff17072232480ef471eae80a22b66b1dd8b7a.tar.gz lwn-f6fff17072232480ef471eae80a22b66b1dd8b7a.zip | |
crypto: salsa20-generic - use crypto_xor_cpy()
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>
Diffstat (limited to 'crypto/salsa20_generic.c')
| -rw-r--r-- | crypto/salsa20_generic.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/crypto/salsa20_generic.c b/crypto/salsa20_generic.c index 00fce32ae17a..443fba09cbed 100644 --- a/crypto/salsa20_generic.c +++ b/crypto/salsa20_generic.c @@ -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); } } |