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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

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

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;
}

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