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crypto: atmel-aes - Add NIST 800-38A's zero length cryptlen constraint

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NIST 800-38A requires for the ECB, CBC, CFB, OFB and CTR modes that
the plaintext and ciphertext to have a positive integer length.

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 11:55:31 +03:00 committed by Herbert Xu
parent 26d769ae90
commit 0d0433599d
1 changed files with 7 additions and 0 deletions
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7
drivers/crypto/atmel-aes.c
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@ -1094,6 +1094,13 @@ static int atmel_aes_crypt(struct skcipher_request *req, unsigned long mode)
if (opmode == AES_FLAGS_XTS && req->cryptlen < XTS_BLOCK_SIZE)
return -EINVAL;
/*
* ECB, CBC, CFB, OFB or CTR mode require the plaintext and ciphertext
* to have a positve integer length.
*/
if (!req->cryptlen && opmode != AES_FLAGS_XTS)
return 0;
if ((opmode == AES_FLAGS_ECB || opmode == AES_FLAGS_CBC) &&
!IS_ALIGNED(req->cryptlen, crypto_skcipher_blocksize(skcipher)))
return -EINVAL;