文章目录
openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_paramgen.c
概述
产生DSA的_evp_pkey_ctx
初始化_evp_pkey_ctx
设置参数到_evp_pkey_ctx
由_evp_pkey_ctx产生_evp_pkey
打印_evp_pkey公开值和DSA param
笔记
c
/*!
\file EVP_PKEY_DSA_paramgen.c
\note
openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_paramgen.c
产生DSA的_evp_pkey_ctx
初始化_evp_pkey_ctx
设置参数到_evp_pkey_ctx
由_evp_pkey_ctx产生_evp_pkey
打印_evp_pkey公开值和DSA param
*/
/*-
* 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 DSA params using
* FIPS 186-4 DSA FFC parameter generation.
*/
#include <openssl/evp.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 = NULL;
OSSL_PARAM params[7];
unsigned int pbits = 2048;
unsigned int qbits = 256;
int gindex = 42;
_evp_pkey_ctx = EVP_PKEY_CTX_new_from_name(_ossl_lib_ctx, "DSA", propq);
if (_evp_pkey_ctx == NULL)
goto cleanup;
/*
* Demonstrate how to set optional DSA fields as params.
* See doc/man7/EVP_PKEY-FFC.pod and doc/man7/EVP_PKEY-DSA.pod
* for more information.
*/
params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE,
"fips186_4", 0);
params[1] = OSSL_PARAM_construct_uint(OSSL_PKEY_PARAM_FFC_PBITS, &pbits);
params[2] = OSSL_PARAM_construct_uint(OSSL_PKEY_PARAM_FFC_QBITS, &qbits);
params[3] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_GINDEX, &gindex);
params[4] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST,
"SHA384", 0);
params[5] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS,
"provider=default", 0);
params[6] = OSSL_PARAM_construct_end();
/* Generate a dsa param key using optional params */
if (EVP_PKEY_paramgen_init(_evp_pkey_ctx) <= 0
|| EVP_PKEY_CTX_set_params(_evp_pkey_ctx, params) <= 0
|| EVP_PKEY_paramgen(_evp_pkey_ctx, &_evp_pkey) <= 0) {
fprintf(stderr, "DSA paramgen failed\n");
goto cleanup;
}
if (!dsa_print_key(_evp_pkey, 0, _ossl_lib_ctx, propq))
goto cleanup;
ret = EXIT_SUCCESS;
cleanup:
EVP_PKEY_free(_evp_pkey);
EVP_PKEY_CTX_free(_evp_pkey_ctx);
return ret;
}