openssl3.2 - exp - generate ecc priv key

文章目录

- openssl3.2 - exp - generate ecc priv key
- 概述
- 笔记
- 备注
- END

openssl3.2 - exp - generate ecc priv key

概述

前面实验已经将ECC加解密的流程用openssl命令模拟出来了.
现在开始将ECC加解密流程中的知识点从openssl.exe源码中迁移到自己工程.

先迁移了一个命令如下

openssl ecparam -name sect571r1 -genkey -noout -out priv_key_s.pem

封装了一个函数, 产生ecc密钥到buffer, 好使.

笔记

/*!
* \file exp020_ecc_gen_priv_key.cpp
* \note openssl3.2 - exp - generate ecc priv key产生ECC私钥单步调试, 移植openssl命令行的实现openssl ecparam -name sect571r1 -genkey -noout -out priv_key_s.pem
*/#include "my_openSSL_lib.h"
#include <openssl/crypto.h>
#include <openssl/bio.h>
#include <openssl/params.h>
#include <openssl/core_names.h>
#include <openssl/evp.h>
#include <openssl/encoder.h>#include <stdlib.h>
#include <stdio.h>
#include <assert.h>#include "CMemHookRec.h"void my_openssl_app();
bool my_ecc_gen_priv_key(const char* keytype, const char* curve_name, const char* out_format, unsigned char*& pdata, size_t& data_len);int main(int argc, char** argv)
{setvbuf(stdout, NULL, _IONBF, 0); // 清掉stdout缓存, 防止调用printf时阻塞mem_hook();my_openssl_app();mem_unhook();/*! run resultec priv key:0000 - 2d 2d 2d 2d 2d 42 45 47-49 4e 20 45 43 20 50 52   -----BEGIN EC PR0010 - 49 56 41 54 45 20 4b 45-59 2d 2d 2d 2d 2d 0a 4d   IVATE KEY-----.M0020 - 49 48 75 41 67 45 42 42-45 67 43 53 4d 2f 56 6a   IHuAgEBBEgCSM/Vj// ...0160 - 2b 31 64 0a 58 41 3d 3d-0a 2d 2d 2d 2d 2d 45 4e   +1d.XA==.-----EN0170 - 44 20 45 43 20 50 52 49-56 41 54 45 20 4b 45 59   D EC PRIVATE KEY0180 - 2d 2d 2d 2d 2d 0a                                 -----.free map, g_mem_hook_map.size() = 0*/return 0;
}void my_openssl_app()
{bool b_rc = false;unsigned char* pdata = NULL;size_t data_len = 0;b_rc = my_ecc_gen_priv_key("ec", "sect571r1", "PEM", pdata, data_len);assert(b_rc);printf("ec priv key:\n");BIO_dump_fp(stdout, pdata, data_len);if (NULL != pdata){OPENSSL_free(pdata);pdata = NULL;}
}bool my_ecc_gen_priv_key(const char* keytype, const char* curve_name, const char* out_format, unsigned char*& pdata, size_t& data_len)
{// openssl ecparam -name sect571r1 -genkey -noout -out priv_key_s.pembool b_rc = false;OSSL_PARAM _ossl_param_ary[2];EVP_PKEY_CTX* _evp_pkey_ctx_key_type = NULL;EVP_PKEY* _evp_pkey_key_type = NULL;EVP_PKEY_CTX* _evp_pkey_ctx_key = NULL;OSSL_ENCODER_CTX* _ossl_encoder_ctx = NULL;OSSL_LIB_CTX* _ossl_lib_ctx = NULL;EVP_PKEY* _evp_pkey = NULL;do {_ossl_lib_ctx = OSSL_LIB_CTX_new();if (NULL == _ossl_lib_ctx){break;}_evp_pkey_ctx_key_type = EVP_PKEY_CTX_new_from_name(_ossl_lib_ctx, keytype, NULL);if (NULL == _evp_pkey_ctx_key_type){break;}if (EVP_PKEY_keygen_init(_evp_pkey_ctx_key_type) <= 0){break;}_ossl_param_ary[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, (char*)curve_name, 0);_ossl_param_ary[1] = OSSL_PARAM_construct_end();if (EVP_PKEY_CTX_set_params(_evp_pkey_ctx_key_type, _ossl_param_ary) <= 0){break;}if (EVP_PKEY_keygen(_evp_pkey_ctx_key_type, &_evp_pkey_key_type) <= 0){break;}_evp_pkey_ctx_key = EVP_PKEY_CTX_new_from_pkey(_ossl_lib_ctx, _evp_pkey_key_type, NULL);if (NULL == _evp_pkey_ctx_key){break;}if (EVP_PKEY_keygen_init(_evp_pkey_ctx_key) <= 0){break;}if (EVP_PKEY_keygen(_evp_pkey_ctx_key, &_evp_pkey) <= 0){break;}_ossl_encoder_ctx = OSSL_ENCODER_CTX_new_for_pkey(_evp_pkey, OSSL_KEYMGMT_SELECT_ALL, out_format, NULL, NULL);if (NULL == _ossl_encoder_ctx){break;}/*int OSSL_ENCODER_to_data(OSSL_ENCODER_CTX *ctx, unsigned char **pdata, size_t *pdata_len);, unsigned char*& pdata, size_t& data_len*/if (1 != OSSL_ENCODER_to_data(_ossl_encoder_ctx, &pdata, &data_len)){break;}b_rc = true;} while (false);if (NULL != _ossl_encoder_ctx){OSSL_ENCODER_CTX_free(_ossl_encoder_ctx);_ossl_encoder_ctx = NULL;}if (NULL != _evp_pkey){EVP_PKEY_free(_evp_pkey);_evp_pkey = NULL;}if (NULL != _evp_pkey_key_type){EVP_PKEY_free(_evp_pkey_key_type);}if (NULL != _evp_pkey_ctx_key_type){EVP_PKEY_CTX_free(_evp_pkey_ctx_key_type);_evp_pkey_ctx_key_type = NULL;}if (NULL != _evp_pkey_ctx_key){EVP_PKEY_CTX_free(_evp_pkey_ctx_key);_evp_pkey_ctx_key = NULL;}if (NULL != _ossl_lib_ctx){OSSL_LIB_CTX_free(_ossl_lib_ctx);_ossl_lib_ctx = NULL;}return b_rc;
}