crypto: hifn_795x - 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>

drivers/crypto/hifn_795x.c

@@ -1976,6 +1976,29 @@ static int hifn_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 	return 0;
 }
 
+static int hifn_des3_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
+			    unsigned int len)
+{
+	struct hifn_context *ctx = crypto_ablkcipher_ctx(cipher);
+	struct hifn_device *dev = ctx->dev;
+	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;
+	}
+
+	dev->flags &= ~HIFN_FLAG_OLD_KEY;
+
+	memcpy(ctx->key, key, len);
+	ctx->keysize = len;
+
+	return 0;
+}
+
 static int hifn_handle_req(struct ablkcipher_request *req)
 {
 	struct hifn_context *ctx = crypto_tfm_ctx(req->base.tfm);
@@ -2240,7 +2263,7 @@ static struct hifn_alg_template hifn_alg_templates[] = {
 		.ablkcipher = {
 			.min_keysize	=	HIFN_3DES_KEY_LENGTH,
 			.max_keysize	=	HIFN_3DES_KEY_LENGTH,
-			.setkey		=	hifn_setkey,
+			.setkey		=	hifn_des3_setkey,
 			.encrypt	=	hifn_encrypt_3des_cfb,
 			.decrypt	=	hifn_decrypt_3des_cfb,
 		},
@@ -2250,7 +2273,7 @@ static struct hifn_alg_template hifn_alg_templates[] = {
 		.ablkcipher = {
 			.min_keysize	=	HIFN_3DES_KEY_LENGTH,
 			.max_keysize	=	HIFN_3DES_KEY_LENGTH,
-			.setkey		=	hifn_setkey,
+			.setkey		=	hifn_des3_setkey,
 			.encrypt	=	hifn_encrypt_3des_ofb,
 			.decrypt	=	hifn_decrypt_3des_ofb,
 		},
@@ -2261,7 +2284,7 @@ static struct hifn_alg_template hifn_alg_templates[] = {
 			.ivsize		=	HIFN_IV_LENGTH,
 			.min_keysize	=	HIFN_3DES_KEY_LENGTH,
 			.max_keysize	=	HIFN_3DES_KEY_LENGTH,
-			.setkey		=	hifn_setkey,
+			.setkey		=	hifn_des3_setkey,
 			.encrypt	=	hifn_encrypt_3des_cbc,
 			.decrypt	=	hifn_decrypt_3des_cbc,
 		},
@@ -2271,7 +2294,7 @@ static struct hifn_alg_template hifn_alg_templates[] = {
 		.ablkcipher = {
 			.min_keysize	=	HIFN_3DES_KEY_LENGTH,
 			.max_keysize	=	HIFN_3DES_KEY_LENGTH,
-			.setkey		=	hifn_setkey,
+			.setkey		=	hifn_des3_setkey,
 			.encrypt	=	hifn_encrypt_3des_ecb,
 			.decrypt	=	hifn_decrypt_3des_ecb,
 		},