Coverage Report

Created: 2024-05-21 06:52

/src/openssl/crypto/dsa/dsa_check.c
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Source (jump to first uncovered line)
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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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0
{
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0
    if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
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0
        return ossl_ffc_params_simple_validate(dsa->libctx, &dsa->params,
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0
                                               FFC_PARAM_TYPE_DSA, ret);
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0
    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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0
        return ossl_ffc_params_full_validate(dsa->libctx, &dsa->params,
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0
                                             FFC_PARAM_TYPE_DSA, ret);
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0
}
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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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0
{
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0
    return ossl_ffc_validate_public_key(&dsa->params, pub_key, ret)
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0
           && *ret == 0;
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0
}
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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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0
{
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0
    return ossl_ffc_validate_public_key_partial(&dsa->params, pub_key, ret)
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0
           && *ret == 0;
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0
}
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int ossl_dsa_check_priv_key(const DSA *dsa, const BIGNUM *priv_key, int *ret)
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0
{
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0
    *ret = 0;
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0
    return (dsa->params.q != NULL
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0
            && ossl_ffc_validate_private_key(dsa->params.q, priv_key, ret));
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0
}
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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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0
{
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0
    int ret = 0;
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0
    BN_CTX *ctx = NULL;
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0
    BIGNUM *pub_key = NULL;
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0
    if (dsa->params.p == NULL
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0
        || dsa->params.g == NULL
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0
        || dsa->priv_key == NULL
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0
        || dsa->pub_key == NULL)
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        return 0;
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0
    ctx = BN_CTX_new_ex(dsa->libctx);
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0
    if (ctx == NULL)
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0
        goto err;
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0
    pub_key = BN_new();
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0
    if (pub_key == NULL)
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0
        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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0
        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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0
err:
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0
    BN_free(pub_key);
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0
    BN_CTX_free(ctx);
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0
    return ret;
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0
}