[PATCH 7/24] crypto: cavium - Forbid 2-key 3DES in FIPS mode

[Herbert Xu <herbert@gondor.apana.org.au>]

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

 drivers/crypto/cavium/cpt/cptvf_algs.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/crypto/cavium/cpt/cptvf_algs.c b/drivers/crypto/cavium/cpt/cptvf_algs.c
index 600336d169a9..8cffe6094270 100644
--- a/drivers/crypto/cavium/cpt/cptvf_algs.c
+++ b/drivers/crypto/cavium/cpt/cptvf_algs.c
@@ -327,12 +327,30 @@ static int cvm_cfb_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 static int cvm_cbc_des3_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 			       u32 keylen)
 {
+	u32 flags = crypto_ablkcipher_get_flags(cipher);
+	int err;
+
+	err = __des3_verify_key(&flags, key);
+	if (unlikely(err)) {
+		crypto_ablkcipher_set_flags(cipher, flags);
+		return err;
+	}
+
 	return cvm_setkey(cipher, key, keylen, DES3_CBC);
 }
 
 static int cvm_ecb_des3_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 			       u32 keylen)
 {
+	u32 flags = crypto_ablkcipher_get_flags(cipher);
+	int err;
+
+	err = __des3_verify_key(&flags, key);
+	if (unlikely(err)) {
+		crypto_ablkcipher_set_flags(cipher, flags);
+		return err;
+	}
+
 	return cvm_setkey(cipher, key, keylen, DES3_ECB);
 }