linux-kernel - [PATCH 5/9] crypto: atmel-aes: Add NIST 800-38A's zero length cryptlen constraint

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Date:   Tue, 20 Jul 2021 11:55:31 +0300
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <herbert@...dor.apana.org.au>
CC:     <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <ludovic.desroches@...rochip.com>, <linux-crypto@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        "Tudor Ambarus" <tudor.ambarus@...rochip.com>
Subject: [PATCH 5/9] crypto: atmel-aes: Add NIST 800-38A's zero length cryptlen constraint

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@...rochip.com>
---
 drivers/crypto/atmel-aes.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
index 4e9515e8dd25..8ea873bf6b86 100644
--- a/drivers/crypto/atmel-aes.c
+++ b/drivers/crypto/atmel-aes.c
@@ -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;
-- 
2.25.1