crypto: ccp - Forbid 2-key 3DES in FIPS mode

This patch forbids the use of 2-key 3DES (K1 == K3) in FIPS mode.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/ccp/ccp-crypto-des3.c b/drivers/crypto/ccp/ccp-crypto-des3.c
index c2ff551..91482ff 100644 (file)
--- a/drivers/crypto/ccp/ccp-crypto-des3.c
+++ b/drivers/crypto/ccp/ccp-crypto-des3.c
@@ -43,24 +43,11 @@ static int ccp_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
        struct ccp_crypto_ablkcipher_alg *alg =
                ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm));
        u32 *flags = &tfm->base.crt_flags;
+       int err;
 
-
-       /* From des_generic.c:
-        *
-        * RFC2451:
-        *   If the first two or last two independent 64-bit keys are
-        *   equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
-        *   same as DES.  Implementers MUST reject keys that exhibit this
-        *   property.
-        */
-       const u32 *K = (const u32 *)key;
-
-       if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
-                    !((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
-                    (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
-               *flags |= CRYPTO_TFM_RES_WEAK_KEY;
-               return -EINVAL;
-       }
+       err = __des3_verify_key(flags, key);
+       if (unlikely(err))
+               return err;
 
        /* It's not clear that there is any support for a keysize of 112.
         * If needed, the caller should make K1 == K3