crypto: ux500 - Forbid 2-key 3DES in FIPS mode

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

It also removes the registration of the non-standard des/des3
ablkcipher algorithms.

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

drivers/crypto/ux500/cryp/cryp_core.c

@@ -1019,37 +1019,16 @@ static int des3_ablkcipher_setkey(struct crypto_ablkcipher *cipher,
 				  const u8 *key, unsigned int keylen)
 {
 	struct cryp_ctx *ctx = crypto_ablkcipher_ctx(cipher);
-	u32 *flags = &cipher->base.crt_flags;
-	const u32 *K = (const u32 *)key;
-	u32 tmp[DES3_EDE_EXPKEY_WORDS];
-	int i, ret;
+	u32 flags;
+	int err;
 
 	pr_debug(DEV_DBG_NAME " [%s]", __func__);
-	if (keylen != DES3_EDE_KEY_SIZE) {
-		*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
-		pr_debug(DEV_DBG_NAME " [%s]: CRYPTO_TFM_RES_BAD_KEY_LEN",
-				__func__);
-		return -EINVAL;
-	}
 
-	/* Checking key interdependency for weak key detection. */
-	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;
-		pr_debug(DEV_DBG_NAME " [%s]: CRYPTO_TFM_RES_WEAK_KEY",
-			 __func__);
-		return -EINVAL;
-	}
-	for (i = 0; i < 3; i++) {
-		ret = des_ekey(tmp, key + i*DES_KEY_SIZE);
-		if (unlikely(ret == 0) &&
-		    (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
-			*flags |= CRYPTO_TFM_RES_WEAK_KEY;
-			pr_debug(DEV_DBG_NAME " [%s]: CRYPTO_TFM_RES_WEAK_KEY",
-				 __func__);
-			return -EINVAL;
-		}
+	flags = crypto_ablkcipher_get_flags(cipher);
+	err = __des3_verify_key(&flags, key);
+	if (unlikely(err)) {
+		crypto_ablkcipher_set_flags(cipher, flags);
+		return err;
 	}
 
 	memcpy(ctx->key, key, keylen);
@@ -1216,57 +1195,6 @@ static struct cryp_algo_template cryp_algs[] = {
 			}
 		}
 	},
-	{
-		.algomode = CRYP_ALGO_DES_ECB,
-		.crypto = {
-			.cra_name = "des",
-			.cra_driver_name = "des-ux500",
-			.cra_priority = 300,
-			.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
-						CRYPTO_ALG_ASYNC,
-			.cra_blocksize = DES_BLOCK_SIZE,
-			.cra_ctxsize = sizeof(struct cryp_ctx),
-			.cra_alignmask = 3,
-			.cra_type = &crypto_ablkcipher_type,
-			.cra_init = cryp_cra_init,
-			.cra_module = THIS_MODULE,
-			.cra_u = {
-				.ablkcipher = {
-					.min_keysize = DES_KEY_SIZE,
-					.max_keysize = DES_KEY_SIZE,
-					.setkey = des_ablkcipher_setkey,
-					.encrypt = cryp_blk_encrypt,
-					.decrypt = cryp_blk_decrypt
-				}
-			}
-		}
-
-	},
-	{
-		.algomode = CRYP_ALGO_TDES_ECB,
-		.crypto = {
-			.cra_name = "des3_ede",
-			.cra_driver_name = "des3_ede-ux500",
-			.cra_priority = 300,
-			.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
-						CRYPTO_ALG_ASYNC,
-			.cra_blocksize = DES3_EDE_BLOCK_SIZE,
-			.cra_ctxsize = sizeof(struct cryp_ctx),
-			.cra_alignmask = 3,
-			.cra_type = &crypto_ablkcipher_type,
-			.cra_init = cryp_cra_init,
-			.cra_module = THIS_MODULE,
-			.cra_u = {
-				.ablkcipher = {
-					.min_keysize = DES3_EDE_KEY_SIZE,
-					.max_keysize = DES3_EDE_KEY_SIZE,
-					.setkey = des_ablkcipher_setkey,
-					.encrypt = cryp_blk_encrypt,
-					.decrypt = cryp_blk_decrypt
-				}
-			}
-		}
-	},
 	{
 		.algomode = CRYP_ALGO_DES_ECB,
 		.crypto = {