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;
}

END