/* * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include "internal/cryptlib.h" #include #include "dsa_local.h" #include "crypto/dsa.h" int dsa_check_params(const DSA *dsa, int *ret) { /* * (2b) FFC domain params conform to FIPS-186-4 explicit domain param * validity tests. */ return ffc_params_FIPS186_4_validate(dsa->libctx, &dsa->params, FFC_PARAM_TYPE_DSA, ret, NULL); } /* * See SP800-56Ar3 Section 5.6.2.3.1 : FFC Full public key validation. */ int dsa_check_pub_key(const DSA *dsa, const BIGNUM *pub_key, int *ret) { return ffc_validate_public_key(&dsa->params, pub_key, ret); } /* * See SP800-56Ar3 Section 5.6.2.3.1 : FFC Partial public key validation. * To only be used with ephemeral FFC public keys generated using the approved * safe-prime groups. */ int dsa_check_pub_key_partial(const DSA *dsa, const BIGNUM *pub_key, int *ret) { return ffc_validate_public_key_partial(&dsa->params, pub_key, ret); } int dsa_check_priv_key(const DSA *dsa, const BIGNUM *priv_key, int *ret) { *ret = 0; return (dsa->params.q != NULL && ffc_validate_private_key(dsa->params.q, priv_key, ret)); } /* * FFC pairwise check from SP800-56A R3. * Section 5.6.2.1.4 Owner Assurance of Pair-wise Consistency */ int dsa_check_pairwise(const DSA *dsa) { int ret = 0; BN_CTX *ctx = NULL; BIGNUM *pub_key = NULL; if (dsa->params.p == NULL || dsa->params.g == NULL || dsa->priv_key == NULL || dsa->pub_key == NULL) return 0; ctx = BN_CTX_new_ex(dsa->libctx); if (ctx == NULL) goto err; pub_key = BN_new(); if (pub_key == NULL) goto err; /* recalculate the public key = (g ^ priv) mod p */ if (!dsa_generate_public_key(ctx, dsa, dsa->priv_key, pub_key)) goto err; /* check it matches the existing pubic_key */ ret = BN_cmp(pub_key, dsa->pub_key) == 0; err: BN_free(pub_key); BN_CTX_free(ctx); return ret; }