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crypto: atmel-aes - Add blocksize constraint for ECB and CBC modes

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NIST 800-38A requires for the ECB and CBC modes that the total number
of bits in the plaintext to be a multiple of the block cipher.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tudor Ambarus 2021-07-20 11:55:29 +03:00 committed by Herbert Xu
parent 817b804ca3
commit 534b32a8be
1 changed files with 6 additions and 1 deletions
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7
drivers/crypto/atmel-aes.c
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@ -1089,6 +1089,11 @@ static int atmel_aes_crypt(struct skcipher_request *req, unsigned long mode)
struct atmel_aes_base_ctx *ctx = crypto_skcipher_ctx(skcipher);
struct atmel_aes_reqctx *rctx;
struct atmel_aes_dev *dd;
u32 opmode = mode & AES_FLAGS_OPMODE_MASK;
if ((opmode == AES_FLAGS_ECB || opmode == AES_FLAGS_CBC) &&
!IS_ALIGNED(req->cryptlen, crypto_skcipher_blocksize(skcipher)))
return -EINVAL;
switch (mode & AES_FLAGS_OPMODE_MASK) {
case AES_FLAGS_CFB8:
@ -1120,7 +1125,7 @@ static int atmel_aes_crypt(struct skcipher_request *req, unsigned long mode)
rctx = skcipher_request_ctx(req);
rctx->mode = mode;
if ((mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_ECB &&
if (opmode != AES_FLAGS_ECB &&
!(mode & AES_FLAGS_ENCRYPT) && req->src == req->dst) {
unsigned int ivsize = crypto_skcipher_ivsize(skcipher);