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

/*!
\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;
}

END