2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
12 #include <openssl/bn.h>
13 #include "dsa_local.h"
14 #include "crypto/dsa.h"
16 int dsa_check_params(const DSA *dsa, int *ret)
19 * (2b) FFC domain params conform to FIPS-186-4 explicit domain param
22 return ffc_params_FIPS186_4_validate(dsa->libctx, &dsa->params,
23 FFC_PARAM_TYPE_DSA, ret, NULL);
27 * See SP800-56Ar3 Section 5.6.2.3.1 : FFC Full public key validation.
29 int dsa_check_pub_key(const DSA *dsa, const BIGNUM *pub_key, int *ret)
31 return ffc_validate_public_key(&dsa->params, pub_key, ret);
35 * See SP800-56Ar3 Section 5.6.2.3.1 : FFC Partial public key validation.
36 * To only be used with ephemeral FFC public keys generated using the approved
39 int dsa_check_pub_key_partial(const DSA *dsa, const BIGNUM *pub_key, int *ret)
41 return ffc_validate_public_key_partial(&dsa->params, pub_key, ret);
44 int dsa_check_priv_key(const DSA *dsa, const BIGNUM *priv_key, int *ret)
48 return (dsa->params.q != NULL
49 && ffc_validate_private_key(dsa->params.q, priv_key, ret));
53 * FFC pairwise check from SP800-56A R3.
54 * Section 5.6.2.1.4 Owner Assurance of Pair-wise Consistency
56 int dsa_check_pairwise(const DSA *dsa)
60 BIGNUM *pub_key = NULL;
62 if (dsa->params.p == NULL
63 || dsa->params.g == NULL
64 || dsa->priv_key == NULL
65 || dsa->pub_key == NULL)
68 ctx = BN_CTX_new_ex(dsa->libctx);
75 /* recalculate the public key = (g ^ priv) mod p */
76 if (!dsa_generate_public_key(ctx, dsa, dsa->priv_key, pub_key))
78 /* check it matches the existing pubic_key */
79 ret = BN_cmp(pub_key, dsa->pub_key) == 0;