C++使用Openssl进行RSA加密解密及签名验签功能SHA256

#include “stdafx.h“
#include “RSAEncode.h“

//***生成公钥和私钥文件***
void GenerateKey（）
{
	/* 生成公钥 */
	RSA* rsa = RSA_generate_key（1024 RSA_F4 NULL NULL）;
	BIO *bp = BIO_new（BIO_s_file（））;
	BIO_write_filename（bp PUBLIC_KEY_FILE）;
	PEM_write_bio_RSAPublicKey（bp rsa）;
	BIO_free_all（bp）;

	/* 生成私钥 */
	bp = BIO_new（BIO_s_file（））;
	BIO_write_filename（bp PRIVATE_KEY_FILE）;
	PEM_write_bio_RSAPrivateKey（bp rsa NULL NULL 0 NULL NULL）;
	CRYPTO_cleanup_all_ex_data（）;
	BIO_free_all（bp）;
	RSA_free（rsa）;
}

//***通过公钥加密数据***
string EncodeByBioPublicKey（string data）
{
	string strRet;

	OpenSSL_add_all_algorithms（）;
	BIO* bp = BIO_new（BIO_s_file（））;
	BIO_read_filename（bp PUBLIC_KEY_FILE）;
	RSA* rsaK = PEM_read_bio_RSAPublicKey（bp NULL NULL NULL）;
	if （NULL == rsaK）
	{
		unsigned long ulErr = ERR_get_error（）;
		char szErrMsg[1024] = { 0 };
		char *pTmp = NULL;
		pTmp = ERR_error_string（ulErr szErrMsg）;
		printf（“bio_read_publicKey %s
“ szErrMsg）;
		return strRet;
	}

	int nLen = RSA_size（rsaK）;
	char *pEncode = new char[nLen + 1];
	int ret = RSA_public_encrypt（data.length（） （const unsigned char*）data.c_str（）
		（unsigned char *）pEncode rsaK RSA_PKCS1_PADDING）;
	if （ret >= 0）
	{
		strRet = string（pEncode ret）;
	}

	delete[] pEncode;
	CRYPTO_cleanup_all_ex_data（）;
	BIO_free_all（bp）;
	RSA_free（rsaK）;

	return strRet;
}

//***通过私钥解密数据***
string DecodeByBioPrivateKey（string data）
{
	string strRet;
	OpenSSL_add_all_algorithms（）;
	BIO* bp = BIO_new（BIO_s_file（））;
	BIO_read_filename（bp PRIVATE_KEY_FILE）;

	RSA* rsaK;
	rsaK = PEM_read_bio_RSAPrivateKey（bp NULL NULL NULL）;
	if （NULL == rsaK）
	{
		unsigned long ulErr = ERR_get_error（）;
		char szErrMsg[1024] = { 0 };
		char *pTmp = NULL;
		pTmp = ERR_error_string（ulErr szErrMsg）;
		printf（“%s
“ szErrMsg）;
	}

	int nLen = RSA_size（rsaK）;
	char *pEncode = new char[nLen + 1];
	int nRet = RSA_private_decrypt（data.length（） （const unsigned char*）data.c_str（） （unsigned char *）pEncode rsaK RSA_PKCS1_PADDING）;

	if （nRet >= 0）
	{
		strRet = string（pEncode nRet）;
	}

	delete[] pEncode;
	CRYPTO_cleanup_all_ex_data（）;
	BIO_free_all（bp）;
	RSA_free（rsaK）;

	return strRet;
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

    ..A..H.     44032  2019-09-19 17:37  RSAWithOpenSSL.vsRSAWithOpenSSLv14.suo

     文件    2104320  2019-09-19 00:08  RSAWithOpenSSLReleaselibcrypto-1_1.dll

     文件     503808  2019-09-19 00:08  RSAWithOpenSSLReleaselibssl-1_1.dll

     文件      15360  2019-09-19 17:25  RSAWithOpenSSLReleaseRSAWithOpenSSL.exe

     文件       3349  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslaes.h

     文件       3508  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslapplink.c

     文件      33627  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslasn1.h

     文件      14599  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslasn1err.h

     文件      32940  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslasn1t.h

     文件        395  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslasn1_mac.h

     文件       2398  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslasync.h

     文件       1326  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslasyncerr.h

     文件      34868  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslio.h

     文件       6400  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslioerr.h

     文件       1847  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopenssllowfish.h

     文件      22135  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopenssln.h

     文件       4907  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslnerr.h

     文件       1600  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopenssluffer.h

     文件        820  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopenssluffererr.h

     文件       3179  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslcamellia.h

     文件       1674  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslcast.h

     文件       1064  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslcmac.h

     文件      16379  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslcms.h

     文件      11160  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslcmserr.h

     文件       1328  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslcomp.h

     文件       1212  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslcomperr.h

     文件       5601  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslconf.h

     文件       3429  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslconferr.h

     文件       1300  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslconf_api.h

     文件      17239  2019-09-19 00:08  RSAWithOpenSSLRSAWithOpenSSLincludeopensslcrypto.h

............此处省略112个文件信息