diff options
| author | Ryan Wanner <Ryan.Wanner@microchip.com> | 2023-03-28 22:56:28 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2023-04-06 11:41:28 +0300 |
| commit | 2fbe4829f758e0b588470fb53f6cd087fe92b8d3 (patch) | |
| tree | 78dc599e2c5e1ea90461dbfbc12d42d964226bf7 /drivers/crypto | |
| parent | c13357fd4a8a56b345db25b875239a740deea18c (diff) | |
| download | linux-2fbe4829f758e0b588470fb53f6cd087fe92b8d3.tar.xz | |
crypto: atmel-aes - Detecting in-place operations two sg lists
Avoiding detecting finely in-place operations with different
scatter lists. Copying the source data for decryption into rctx->lastc
regardless if the operation is in-place or not. This allows in-place
operations with different scatter lists.
This approach takes less resources than parsing both scatter lists to
check if they are equal.
Signed-off-by: Ryan Wanner <Ryan.Wanner@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/atmel-aes.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c index ed10f2ae4523..23d285439806 100644 --- a/drivers/crypto/atmel-aes.c +++ b/drivers/crypto/atmel-aes.c @@ -493,17 +493,11 @@ static void atmel_aes_set_iv_as_last_ciphertext_block(struct atmel_aes_dev *dd) if (req->cryptlen < ivsize) return; - if (rctx->mode & AES_FLAGS_ENCRYPT) { + if (rctx->mode & AES_FLAGS_ENCRYPT) scatterwalk_map_and_copy(req->iv, req->dst, req->cryptlen - ivsize, ivsize, 0); - } else { - if (req->src == req->dst) - memcpy(req->iv, rctx->lastc, ivsize); - else - scatterwalk_map_and_copy(req->iv, req->src, - req->cryptlen - ivsize, - ivsize, 0); - } + else + memcpy(req->iv, rctx->lastc, ivsize); } static inline struct atmel_aes_ctr_ctx * @@ -1146,7 +1140,7 @@ static int atmel_aes_crypt(struct skcipher_request *req, unsigned long mode) rctx->mode = mode; if (opmode != AES_FLAGS_ECB && - !(mode & AES_FLAGS_ENCRYPT) && req->src == req->dst) { + !(mode & AES_FLAGS_ENCRYPT)) { unsigned int ivsize = crypto_skcipher_ivsize(skcipher); if (req->cryptlen >= ivsize) |