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crypto: atmel-tdes - Add FIPS81's zero length cryptlen constraint

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FIPS81 requires for the ECB, CBC, CFB, and OFB modes that the
plaintext and ciphertext to have a positive integer length.
Add this constraint and just return 0 for a zero length cryptlen.

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 11:55:32 +03:00 committed by Herbert Xu
parent 0d0433599d
commit 031f5e0015
1 changed files with 3 additions and 0 deletions
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3
drivers/crypto/atmel-tdes.c
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@ -682,6 +682,9 @@ static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode)
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
struct device *dev = ctx->dd->dev;
if (!req->cryptlen)
return 0;
switch (mode & TDES_FLAGS_OPMODE_MASK) {
case TDES_FLAGS_CFB8:
if (!IS_ALIGNED(req->cryptlen, CFB8_BLOCK_SIZE)) {