[PATCH 3.10 030/139] crypto: talitos - Extend max key length for SHA384/512-HMAC and AEAD

[Willy Tarreau]

From: Martin Hicks <mort@xxxxxxxx>

commit 03d2c5114c95797c0aa7d9f463348b171a274fd4 upstream.

An updated patch that also handles the additional key length requirements
for the AEAD algorithms.

The max keysize is not 96.  For SHA384/512 it's 128, and for the AEAD
algorithms it's longer still.  Extend the max keysize for the
AEAD size for AES256 + HMAC(SHA512).

Cc: <stable@xxxxxxxxxxxxxxx> 
Fixes: 357fb60502ede ("crypto: talitos - add sha224, sha384 and sha512 to existing AEAD algorithms")
Signed-off-by: Martin Hicks <mort@xxxxxxxx>
Acked-by: Horia GeantÄ <horia.geanta@xxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 drivers/crypto/talitos.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 057d894..6e5ba44 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -623,7 +623,7 @@ static void talitos_unregister_rng(struct device *dev)
  * crypto alg
  */
 #define TALITOS_CRA_PRIORITY		3000
-#define TALITOS_MAX_KEY_SIZE		96
+#define TALITOS_MAX_KEY_SIZE		(AES_MAX_KEY_SIZE + SHA512_BLOCK_SIZE)
 #define TALITOS_MAX_IV_LENGTH		16 /* max of AES_BLOCK_SIZE, DES3_EDE_BLOCK_SIZE */
 
 #define MD5_BLOCK_SIZE    64
@@ -1380,6 +1380,11 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *cipher,
 {
 	struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
 
+	if (keylen > TALITOS_MAX_KEY_SIZE) {
+		crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+
 	memcpy(&ctx->key, key, keylen);
 	ctx->keylen = keylen;
 
-- 
2.8.0.rc2.1.gbe9624a