openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_keygen.c

openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_keygen.c

概述

das.h 中有2个公共函数(给pkey目录的所有工程公用):
print_bn() 打印大数值
dsa_print_key() 打印key值

打印_evp_pkey_dsa的共有数据(p,q,g, seed, pcounter) + 公钥/私钥 + DSA参数
每次产生的pkey都不一样(因为seed不一样)

笔记

/*!
\file EVP_PKEY_DSA_keygen.c
\note
openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_keygen.c
das.h 中有2个公共函数(给pkey目录的所有工程公用):
print_bn() 打印大数值
dsa_print_key() 打印key值打印_evp_pkey_dsa的共有数据(p,q,g, seed, pcounter) + 公钥/私钥 + DSA参数
每次产生的pkey都不一样(因为seed不一样)
*//*-* 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 generate an DSA key pair.*/#include <openssl/evp.h>
#include "dsa.h"#include "my_openSSL_lib.h"/** Generate dsa params using default values.* See the EVP_PKEY_DSA_param_fromdata demo if you need* to load DSA params from raw values.* See the EVP_PKEY_DSA_paramgen demo if you need to* use non default parameters.*/
EVP_PKEY* dsa_genparams(OSSL_LIB_CTX* libctx, const char* propq)
{EVP_PKEY* _evp_pkey_dsa_param = NULL;EVP_PKEY_CTX* _evp_pkey_ctx = NULL;/* Use the dsa params in a EVP_PKEY ctx */_evp_pkey_ctx = EVP_PKEY_CTX_new_from_name(libctx, "DSA", propq);if (_evp_pkey_ctx == NULL) {fprintf(stderr, "EVP_PKEY_CTX_new_from_name() failed\n");return NULL;}if (EVP_PKEY_paramgen_init(_evp_pkey_ctx) <= 0|| EVP_PKEY_paramgen(_evp_pkey_ctx, &_evp_pkey_dsa_param) <= 0) {fprintf(stderr, "DSA paramgen failed\n");goto cleanup;}
cleanup:EVP_PKEY_CTX_free(_evp_pkey_ctx);return _evp_pkey_dsa_param;
}int main(int argc, char** argv)
{int ret = EXIT_FAILURE;OSSL_LIB_CTX* _ossl_lib_ctx = NULL;const char* propq = NULL;EVP_PKEY* _evp_pkey_dsa_param = NULL;EVP_PKEY* _evp_pkey_dsa = NULL;EVP_PKEY_CTX* _evp_pkey_ctx = NULL;/* Generate random dsa params */_evp_pkey_dsa_param = dsa_genparams(_ossl_lib_ctx, propq);if (_evp_pkey_dsa_param == NULL)goto cleanup;/* Use the dsa params in a EVP_PKEY ctx */_evp_pkey_ctx = EVP_PKEY_CTX_new_from_pkey(_ossl_lib_ctx, _evp_pkey_dsa_param, propq);if (_evp_pkey_ctx == NULL) {fprintf(stderr, "EVP_PKEY_CTX_new_from_pkey() failed\n");goto cleanup;}/* Generate a key using the dsa params */if (EVP_PKEY_keygen_init(_evp_pkey_ctx) <= 0|| EVP_PKEY_keygen(_evp_pkey_ctx, &_evp_pkey_dsa) <= 0) {fprintf(stderr, "DSA keygen failed\n");goto cleanup;}/*! 打印_evp_pkey_dsa的共有数据(p,q,g, seed, pcounter) + 公钥/私钥 */if (!dsa_print_key(_evp_pkey_dsa, 1, _ossl_lib_ctx, propq))goto cleanup;/*! 打印_evp_pkey_dsa2的共有数据(p,q,g, seed, pcounter) + DSA参数 */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_free(_evp_pkey_dsa_param);EVP_PKEY_CTX_free(_evp_pkey_ctx);return ret;
}

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