[PATCH] crypto: talitos - fix setkey to check key weakness

[Christophe Leroy]

Crypto manager test report the following failures:
[    3.061081] alg: skcipher: setkey failed on test 5 for ecb-des-talitos: 
flags=100
[    3.069342] alg: skcipher-ddst: setkey failed on test 5 for ecb-des-talitos: 
flags=100
[    3.077754] alg: skcipher-ddst: setkey failed on test 5 for ecb-des-talitos: 
flags=100

This is due to setkey being expected to detect weak keys.

Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
 drivers/crypto/talitos.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index e7e31f8fd3d1..09a2cd3a31d2 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1494,12 +1494,20 @@ static int ablkcipher_setkey(struct crypto_ablkcipher 
*cipher,
                             const u8 *key, unsigned int keylen)
 {
        struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
+       u32 tmp[DES_EXPKEY_WORDS];
 
        if (keylen > TALITOS_MAX_KEY_SIZE) {
                crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
                return -EINVAL;
        }
 
+       if (unlikely(crypto_ablkcipher_get_flags(cipher) &
+                    CRYPTO_TFM_REQ_WEAK_KEY) &&
+           !des_ekey(tmp, key)) {
+               crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_WEAK_KEY);
+               return -EINVAL;
+       }
+
        memcpy(&ctx->key, key, keylen);
        ctx->keylen = keylen;
 
-- 
2.13.3