openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_paramfromdata.c
概述
开源工程包含的头文件类型是.inc, 要重命名为.h, 否则没有c++头文件语法提示文章来源:https://www.toymoban.com/news/detail-804298.html
从数组中载入大数p,q,g
建立ossl_param, 设置参数的p,q,g
用参数初始化_evp_pkey_ctx, 得到_evp_pkey_dsa
打印_evp_pkey_dsa的共有数据(p,q,g …) + 参数文章来源地址https://www.toymoban.com/news/detail-804298.html
笔记
/*!
\file EVP_PKEY_DSA_paramfromdata.c
\note
openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_paramfromdata.c
开源工程包含的头文件类型是.inc, 要重命名为.h, 否则没有c++头文件语法提示
从数组中载入大数p,q,g
建立ossl_param, 设置参数的p,q,g
用参数初始化_evp_pkey_ctx, 得到_evp_pkey_dsa
打印_evp_pkey_dsa的共有数据(p,q,g ...) + 参数
*/
/*-
* Copyright 2022-2023 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
*/
/*
* Example showing how to load DSA params from raw data
* using EVP_PKEY_fromdata()
*/
#include <openssl/param_build.h>
#include <openssl/evp.h>
#include <openssl/core_names.h>
#include "dsa.h"
#include "my_openSSL_lib.h"
int main(int argc, char** argv)
{
int ret = EXIT_FAILURE;
OSSL_LIB_CTX* _ossl_lib_ctx = NULL;
const char* propq = NULL;
EVP_PKEY_CTX* _evp_pkey_ctx = NULL;
EVP_PKEY* _evp_pkey_dsa = NULL;
OSSL_PARAM_BLD* _ossl_param_bld = NULL;
OSSL_PARAM* _ossl_param = NULL;
BIGNUM* p = NULL, * q = NULL, * g = NULL;
p = BN_bin2bn(dsa_p, sizeof(dsa_p), NULL);
q = BN_bin2bn(dsa_q, sizeof(dsa_q), NULL);
g = BN_bin2bn(dsa_g, sizeof(dsa_g), NULL);
if (p == NULL || q == NULL || g == NULL)
goto cleanup;
/* Use OSSL_PARAM_BLD if you need to handle BIGNUM Parameters */
_ossl_param_bld = OSSL_PARAM_BLD_new();
if (_ossl_param_bld == NULL)
goto cleanup;
if (!OSSL_PARAM_BLD_push_BN(_ossl_param_bld, OSSL_PKEY_PARAM_FFC_P, p)
|| !OSSL_PARAM_BLD_push_BN(_ossl_param_bld, OSSL_PKEY_PARAM_FFC_Q, q)
|| !OSSL_PARAM_BLD_push_BN(_ossl_param_bld, OSSL_PKEY_PARAM_FFC_G, g))
goto cleanup;
_ossl_param = OSSL_PARAM_BLD_to_param(_ossl_param_bld);
if (_ossl_param == NULL)
goto cleanup;
_evp_pkey_ctx = EVP_PKEY_CTX_new_from_name(_ossl_lib_ctx, "DSA", propq);
if (_evp_pkey_ctx == NULL) {
fprintf(stderr, "EVP_PKEY_CTX_new_from_name() failed\n");
goto cleanup;
}
if (EVP_PKEY_fromdata_init(_evp_pkey_ctx) <= 0
|| EVP_PKEY_fromdata(_evp_pkey_ctx, &_evp_pkey_dsa, EVP_PKEY_KEY_PARAMETERS, _ossl_param) <= 0) {
fprintf(stderr, "EVP_PKEY_fromdata() failed\n");
goto cleanup;
}
if (!dsa_print_key(_evp_pkey_dsa, 0, _ossl_lib_ctx, propq))
goto cleanup;
ret = EXIT_SUCCESS;
cleanup:
EVP_PKEY_free(_evp_pkey_dsa);
EVP_PKEY_CTX_free(_evp_pkey_ctx);
OSSL_PARAM_free(_ossl_param);
OSSL_PARAM_BLD_free(_ossl_param_bld);
BN_free(g);
BN_free(q);
BN_free(p);
return ret;
}
END
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