Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | Tudor Ambarus <> | Subject | [PATCH 6/9] crypto: atmel-tdes: Add FIPS81's zero length cryptlen constraint | Date | Tue, 20 Jul 2021 11:55:32 +0300 |
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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> --- drivers/crypto/atmel-tdes.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/crypto/atmel-tdes.c b/drivers/crypto/atmel-tdes.c index abbf1b7a75ab..8380e0ab149a 100644 --- a/drivers/crypto/atmel-tdes.c +++ b/drivers/crypto/atmel-tdes.c @@ -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)) { -- 2.25.1
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