怎样才能做自己的网站,建筑工程网正保,北京网站建设技术部,学生可以做的网站兼职文章目录 openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_EC_keygen.c概述笔记END openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_EC_keygen.c
概述
给定椭圆曲线名字, 产生上下文_evp_pkey_ctx 设置_evp_pkey_ctx的椭圆曲线参数(有默认参数, 不用特意设置, 给熟悉的人用), 不… 文章目录 openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_EC_keygen.c概述笔记END openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_EC_keygen.c
概述
给定椭圆曲线名字, 产生上下文_evp_pkey_ctx 设置_evp_pkey_ctx的椭圆曲线参数(有默认参数, 不用特意设置, 给熟悉的人用), 不熟悉密码学的人, 只选椭圆曲线的名字就行 从_evp_pkey_ctx产生ec key; 打印 ec EVP_PKEY 的值(可以取出椭圆曲线的名字, 公钥, 私钥).
笔记
/*!
\file EVP_PKEY_EC_keygen.c
\note
openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_EC_keygen.c给定椭圆曲线名字, 产生上下文_evp_pkey_ctx
设置_evp_pkey_ctx的椭圆曲线参数(有默认参数, 不用特意设置, 给熟悉的人用), 不熟悉密码学的人, 只选椭圆曲线的名字就行
从_evp_pkey_ctx产生ec key;
打印 ec EVP_PKEY 的值(可以取出椭圆曲线的名字, 公钥, 私钥).
*//*-* Copyright 2021-2023 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 EC key and extract values from the* generated key.*/#include string.h
#include stdio.h
#include openssl/err.h
#include openssl/evp.h
#include openssl/core_names.h#include my_openSSL_lib.hstatic int get_key_values(EVP_PKEY* pkey);/** The following code shows how to generate an EC key from a curve name* with additional parameters. If only the curve name is required then the* simple helper can be used instead i.e. Either* pkey EVP_EC_gen(curvename); OR* pkey EVP_PKEY_Q_keygen(libctx, propq, EC, curvename);*/
static EVP_PKEY* do_ec_keygen(void)
{/** The libctx and propq can be set if required, they are included here* to show how they are passed to EVP_PKEY_CTX_new_from_name().*/OSSL_LIB_CTX* _ossl_lib_ctx NULL;const char* propq NULL;EVP_PKEY* key NULL;OSSL_PARAM _ossl_param[3];EVP_PKEY_CTX* _evp_pkey_ctx NULL;const char* curvename P-256; /*! 椭圆曲线的名字 */int use_cofactordh 1;_evp_pkey_ctx EVP_PKEY_CTX_new_from_name(_ossl_lib_ctx, EC, propq);if (_evp_pkey_ctx NULL) {fprintf(stderr, EVP_PKEY_CTX_new_from_name() failed\n);goto cleanup;}if (EVP_PKEY_keygen_init(_evp_pkey_ctx) 0) {fprintf(stderr, EVP_PKEY_keygen_init() failed\n);goto cleanup;}_ossl_param[0] OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,(char*)curvename, 0);/** This is an optional parameter.* For many curves where the cofactor is 1, setting this has no effect.*/_ossl_param[1] OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH,use_cofactordh);_ossl_param[2] OSSL_PARAM_construct_end();if (!EVP_PKEY_CTX_set_params(_evp_pkey_ctx, _ossl_param)) {fprintf(stderr, EVP_PKEY_CTX_set_params() failed\n);goto cleanup;}fprintf(stdout, Generating EC key\n\n);if (EVP_PKEY_generate(_evp_pkey_ctx, key) 0) {fprintf(stderr, EVP_PKEY_generate() failed\n);goto cleanup;}
cleanup:EVP_PKEY_CTX_free(_evp_pkey_ctx);return key;
}/** The following code shows how retrieve key data from the generated* EC key. See doc/man7/EVP_PKEY-EC.pod for more information.** EVP_PKEY_print_private() could also be used to display the values.*/
static int get_key_values(EVP_PKEY* pkey)
{int ret 0;char out_curvename[80];unsigned char out_pubkey[80];unsigned char out_privkey[80];BIGNUM* out_priv NULL;size_t out_pubkey_len, out_privkey_len 0;if (!EVP_PKEY_get_utf8_string_param(pkey, OSSL_PKEY_PARAM_GROUP_NAME,out_curvename, sizeof(out_curvename),NULL)) {fprintf(stderr, Failed to get curve name\n);goto cleanup;}if (!EVP_PKEY_get_octet_string_param(pkey, OSSL_PKEY_PARAM_PUB_KEY,out_pubkey, sizeof(out_pubkey),out_pubkey_len)) {fprintf(stderr, Failed to get public key\n);goto cleanup;}if (!EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_PRIV_KEY, out_priv)) {fprintf(stderr, Failed to get private key\n);goto cleanup;}out_privkey_len BN_bn2bin(out_priv, out_privkey);if (out_privkey_len 0 || out_privkey_len sizeof(out_privkey)) {fprintf(stderr, BN_bn2bin failed\n);goto cleanup;}fprintf(stdout, Curve name: %s\n, out_curvename);fprintf(stdout, Public key:\n);BIO_dump_indent_fp(stdout, out_pubkey, (int)out_pubkey_len, 2);fprintf(stdout, Private Key:\n);BIO_dump_indent_fp(stdout, out_privkey, (int)out_privkey_len, 2);ret 1;
cleanup:/* Zeroize the private key data when we free it */BN_clear_free(out_priv);return ret;
}int main(void)
{int ret EXIT_FAILURE;EVP_PKEY* _evp_pkey_ec;_evp_pkey_ec do_ec_keygen();if (_evp_pkey_ec NULL)goto cleanup;if (!get_key_values(_evp_pkey_ec))goto cleanup;/** At this point we can write out the generated key using* i2d_PrivateKey() and i2d_PublicKey() if required.*/ret EXIT_SUCCESS;
cleanup:if (ret ! EXIT_SUCCESS)ERR_print_errors_fp(stderr);EVP_PKEY_free(_evp_pkey_ec);return ret;
}
END
