98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
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/*
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* Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* DSA low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include "dsa_local.h"
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#include "crypto/dsa.h"
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int ossl_dsa_check_params(const DSA *dsa, int checktype, int *ret)
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{
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if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
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return ossl_ffc_params_simple_validate(dsa->libctx, &dsa->params,
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FFC_PARAM_TYPE_DSA, ret);
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else
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/*
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* Do full FFC domain params validation according to FIPS-186-4
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* - always in FIPS_MODULE
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* - only if possible (i.e., seed is set) in default provider
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*/
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return ossl_ffc_params_full_validate(dsa->libctx, &dsa->params,
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FFC_PARAM_TYPE_DSA, ret);
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}
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/*
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* See SP800-56Ar3 Section 5.6.2.3.1 : FFC Full public key validation.
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*/
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int ossl_dsa_check_pub_key(const DSA *dsa, const BIGNUM *pub_key, int *ret)
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{
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return ossl_ffc_validate_public_key(&dsa->params, pub_key, ret)
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&& *ret == 0;
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}
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/*
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* See SP800-56Ar3 Section 5.6.2.3.1 : FFC Partial public key validation.
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* To only be used with ephemeral FFC public keys generated using the approved
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* safe-prime groups.
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*/
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int ossl_dsa_check_pub_key_partial(const DSA *dsa, const BIGNUM *pub_key, int *ret)
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{
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return ossl_ffc_validate_public_key_partial(&dsa->params, pub_key, ret)
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&& *ret == 0;
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}
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int ossl_dsa_check_priv_key(const DSA *dsa, const BIGNUM *priv_key, int *ret)
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{
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*ret = 0;
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return (dsa->params.q != NULL
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&& ossl_ffc_validate_private_key(dsa->params.q, priv_key, ret));
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}
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/*
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* FFC pairwise check from SP800-56A R3.
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* Section 5.6.2.1.4 Owner Assurance of Pair-wise Consistency
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*/
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int ossl_dsa_check_pairwise(const DSA *dsa)
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{
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int ret = 0;
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BN_CTX *ctx = NULL;
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BIGNUM *pub_key = NULL;
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if (dsa->params.p == NULL
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|| dsa->params.g == NULL
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|| dsa->priv_key == NULL
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|| dsa->pub_key == NULL)
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return 0;
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ctx = BN_CTX_new_ex(dsa->libctx);
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if (ctx == NULL)
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goto err;
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pub_key = BN_new();
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if (pub_key == NULL)
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goto err;
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/* recalculate the public key = (g ^ priv) mod p */
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if (!ossl_dsa_generate_public_key(ctx, dsa, dsa->priv_key, pub_key))
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goto err;
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/* check it matches the existing pubic_key */
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ret = BN_cmp(pub_key, dsa->pub_key) == 0;
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err:
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BN_free(pub_key);
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BN_CTX_free(ctx);
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return ret;
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}
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