[PATCH 16/24] crypto: n2 - Forbid 2-key 3DES in FIPS mode

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

This patch forbids the use of 2-key 3DES (K1 == K3) in FIPS mode.
   
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---

 drivers/crypto/n2_core.c |   13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/n2_core.c b/drivers/crypto/n2_core.c
index 9450c41211b2..df675aea58f6 100644
--- a/drivers/crypto/n2_core.c
+++ b/drivers/crypto/n2_core.c
@@ -788,13 +788,18 @@ static int n2_3des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 	struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 	struct n2_cipher_context *ctx = crypto_tfm_ctx(tfm);
 	struct n2_cipher_alg *n2alg = n2_cipher_alg(tfm);
+	u32 flags;
+	int err;
+
+	flags = crypto_ablkcipher_get_flags(cipher);
+	err = __des3_verify_key(&flags, key);
+	if (unlikely(err)) {
+		crypto_ablkcipher_set_flags(cipher, flags);
+		return err;
+	}
 
 	ctx->enc_type = n2alg->enc_type;
 
-	if (keylen != (3 * DES_KEY_SIZE)) {
-		crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
-		return -EINVAL;
-	}
 	ctx->key_len = keylen;
 	memcpy(ctx->key.des3, key, keylen);
 	return 0;