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C/C++使用openssl进行摘要和加密解密（md5, sha256, des, rsa）

热度：19   发布时间：2023-12-02 22:06:34.0

penssl里面有很多用于摘要哈希、加密解密的算法，方便集成于工程项目，被广泛应用于网络报文中的安全传输和认证。下面以md5，sha256，des，rsa几个典型的api简单使用作为例子。

 

算法介绍

md5：https://en.wikipedia.org/wiki/MD5

sha256：https://en.wikipedia.org/wiki/SHA-2

des: https://en.wikipedia.org/wiki/Data_Encryption_Standard

rsa: https://en.wikipedia.org/wiki/RSA_(cryptosystem)

 

工程配置

以windows下为例

 

  1. 编译openssl库，得到头文件include和链接库lib和dll
  2. 配置包含头文件目录和库目录
  3. 工程中设置链接指定的lib：fenbieshlibssl.lib，libcrypto.lib
  4. 将对应的dll拷贝到exe执行目录：libcrypto-1_1.dll， libssl-1_1.dll
linux下同理

 

 

代码

#include <iostream>    
#include <cassert>  
#include <string>    
#include <vector>    
#include "openssl/md5.h"    
#include "openssl/sha.h"    
#include "openssl/des.h"    
#include "openssl/rsa.h"    
#include "openssl/pem.h" 
#pragma comment(lib,"libeay32.lib")
#pragma comment(lib,"ssleay32.lib")// ---- md5摘要哈希 ---- //    
void md5(const std::string &srcStr, std::string &encodedStr, std::string &encodedHexStr)  
{  // 调用md5哈希    unsigned char mdStr[33] = {0};  MD5((const unsigned char *)srcStr.c_str(), srcStr.length(), mdStr);  // 哈希后的字符串    encodedStr = std::string((const char *)mdStr);  // 哈希后的十六进制串 32字节    char buf[65] = {0};  char tmp[3] = {0};  for (int i = 0; i < 32; i++)  {  sprintf(tmp, "%02x", mdStr[i]);  strcat(buf, tmp);  }  buf[32] = '\0'; // 后面都是0，从32字节截断    encodedHexStr = std::string(buf);  
}  // ---- sha256摘要哈希 ---- //    
void sha256(const std::string &srcStr, std::string &encodedStr, std::string &encodedHexStr)  
{  // 调用sha256哈希    unsigned char mdStr[33] = {0};  SHA256((const unsigned char *)srcStr.c_str(), srcStr.length(), mdStr);  // 哈希后的字符串    encodedStr = std::string((const char *)mdStr);  // 哈希后的十六进制串 32字节    char buf[65] = {0};  char tmp[3] = {0};  for (int i = 0; i < 32; i++)  {  sprintf(tmp, "%02x", mdStr[i]);  strcat(buf, tmp);  }  buf[32] = '\0'; // 后面都是0，从32字节截断    encodedHexStr = std::string(buf);  
}  // ---- des对称加解密 ---- //    
// 加密 ecb模式    
std::string des_encrypt(const std::string &clearText, const std::string &key)  
{  std::string cipherText; // 密文    DES_cblock keyEncrypt;  memset(keyEncrypt, 0, 8);  // 构造补齐后的密钥    if (key.length() <= 8)  memcpy(keyEncrypt, key.c_str(), key.length());  else  memcpy(keyEncrypt, key.c_str(), 8);  // 密钥置换    DES_key_schedule keySchedule;  DES_set_key_unchecked(&keyEncrypt, &keySchedule);  // 循环加密，每8字节一次    const_DES_cblock inputText;  DES_cblock outputText;  std::vector<unsigned char> vecCiphertext;  unsigned char tmp[8];  for (int i = 0; i < clearText.length() / 8; i++)  {  memcpy(inputText, clearText.c_str() + i * 8, 8);  DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_ENCRYPT);  memcpy(tmp, outputText, 8);  for (int j = 0; j < 8; j++)  vecCiphertext.push_back(tmp[j]);  }  if (clearText.length() % 8 != 0)  {  int tmp1 = clearText.length() / 8 * 8;  int tmp2 = clearText.length() - tmp1;  memset(inputText, 0, 8);  memcpy(inputText, clearText.c_str() + tmp1, tmp2);  // 加密函数    DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_ENCRYPT);  memcpy(tmp, outputText, 8);  for (int j = 0; j < 8; j++)  vecCiphertext.push_back(tmp[j]);  }  cipherText.clear();  cipherText.assign(vecCiphertext.begin(), vecCiphertext.end());  return cipherText;  
}  // 解密 ecb模式    
std::string des_decrypt(const std::string &cipherText, const std::string &key)  
{  std::string clearText; // 明文    DES_cblock keyEncrypt;  memset(keyEncrypt, 0, 8);  if (key.length() <= 8)  memcpy(keyEncrypt, key.c_str(), key.length());  else  memcpy(keyEncrypt, key.c_str(), 8);  DES_key_schedule keySchedule;  DES_set_key_unchecked(&keyEncrypt, &keySchedule);  const_DES_cblock inputText;  DES_cblock outputText;  std::vector<unsigned char> vecCleartext;  unsigned char tmp[8];  for (int i = 0; i < cipherText.length() / 8; i++)  {  memcpy(inputText, cipherText.c_str() + i * 8, 8);  DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_DECRYPT);  memcpy(tmp, outputText, 8);  for (int j = 0; j < 8; j++)  vecCleartext.push_back(tmp[j]);  }  if (cipherText.length() % 8 != 0)  {  int tmp1 = cipherText.length() / 8 * 8;  int tmp2 = cipherText.length() - tmp1;  memset(inputText, 0, 8);  memcpy(inputText, cipherText.c_str() + tmp1, tmp2);  // 解密函数    DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_DECRYPT);  memcpy(tmp, outputText, 8);  for (int j = 0; j < 8; j++)  vecCleartext.push_back(tmp[j]);  }  clearText.clear();  clearText.assign(vecCleartext.begin(), vecCleartext.end());  return clearText;  
}  // ---- rsa非对称加解密 ---- //    
#define KEY_LENGTH  2048               // 密钥长度  
#define PUB_KEY_FILE "pubkey.pem"    // 公钥路径  
#define PRI_KEY_FILE "prikey.pem"    // 私钥路径  // 函数方法生成密钥对   
void generateRSAKey(std::string strKey[2])  
{  // 公私密钥对    size_t pri_len;  size_t pub_len;  char *pri_key = NULL;  char *pub_key = NULL;  // 生成密钥对    RSA *keypair = RSA_generate_key(KEY_LENGTH, RSA_3, NULL, NULL);  BIO *pri = BIO_new(BIO_s_mem());  BIO *pub = BIO_new(BIO_s_mem());  PEM_write_bio_RSAPrivateKey(pri, keypair, NULL, NULL, 0, NULL, NULL);  PEM_write_bio_RSAPublicKey(pub, keypair);  // 获取长度    pri_len = BIO_pending(pri);  pub_len = BIO_pending(pub);  // 密钥对读取到字符串    pri_key = (char *)malloc(pri_len + 1);  pub_key = (char *)malloc(pub_len + 1);  BIO_read(pri, pri_key, pri_len);  BIO_read(pub, pub_key, pub_len);  pri_key[pri_len] = '\0';  pub_key[pub_len] = '\0';  // 存储密钥对    strKey[0] = pub_key;  strKey[1] = pri_key;  // 存储到磁盘（这种方式存储的是begin rsa public key/ begin rsa private key开头的）  FILE *pubFile = fopen(PUB_KEY_FILE, "w");  if (pubFile == NULL)  {  assert(false);  return;  }  fputs(pub_key, pubFile);  fclose(pubFile);  FILE *priFile = fopen(PRI_KEY_FILE, "w");  if (priFile == NULL)  {  assert(false);  return;  }  fputs(pri_key, priFile);  fclose(priFile);  // 内存释放  RSA_free(keypair);  BIO_free_all(pub);  BIO_free_all(pri);  free(pri_key);  free(pub_key);  
}  // 命令行方法生成公私钥对（begin public key/ begin private key）  
// 找到openssl命令行工具，运行以下  
// openssl genrsa -out prikey.pem 1024   
// openssl rsa - in privkey.pem - pubout - out pubkey.pem  // 公钥加密    
std::string rsa_pub_encrypt(const std::string &clearText, const std::string &pubKey)  
{  std::string strRet;  RSA *rsa = NULL;  BIO *keybio = BIO_new_mem_buf((unsigned char *)pubKey.c_str(), -1);  // 此处有三种方法  // 1, 读取内存里生成的密钥对，再从内存生成rsa  // 2, 读取磁盘里生成的密钥对文本文件，在从内存生成rsa  // 3，直接从读取文件指针生成rsa  RSA* pRSAPublicKey = RSA_new();  rsa = PEM_read_bio_RSAPublicKey(keybio, &rsa, NULL, NULL);  int len = RSA_size(rsa);  char *encryptedText = (char *)malloc(len + 1);  memset(encryptedText, 0, len + 1);  // 加密函数  int ret = RSA_public_encrypt(clearText.length(), (const unsigned char*)clearText.c_str(), (unsigned char*)encryptedText, rsa, RSA_PKCS1_PADDING);  if (ret >= 0)  strRet = std::string(encryptedText, ret);  // 释放内存  free(encryptedText);  BIO_free_all(keybio);  RSA_free(rsa);  return strRet;  
}  // 私钥解密    
std::string rsa_pri_decrypt(const std::string &cipherText, const std::string &priKey)  
{  std::string strRet;  RSA *rsa = RSA_new();  BIO *keybio;  keybio = BIO_new_mem_buf((unsigned char *)priKey.c_str(), -1);  // 此处有三种方法  // 1, 读取内存里生成的密钥对，再从内存生成rsa  // 2, 读取磁盘里生成的密钥对文本文件，在从内存生成rsa  // 3，直接从读取文件指针生成rsa  rsa = PEM_read_bio_RSAPrivateKey(keybio, &rsa, NULL, NULL);  int len = RSA_size(rsa);  char *decryptedText = (char *)malloc(len + 1);  memset(decryptedText, 0, len + 1);  // 解密函数  int ret = RSA_private_decrypt(cipherText.length(), (const unsigned char*)cipherText.c_str(), (unsigned char*)decryptedText, rsa, RSA_PKCS1_PADDING);  if (ret >= 0)  strRet = std::string(decryptedText, ret);  // 释放内存  free(decryptedText);  BIO_free_all(keybio);  RSA_free(rsa);  return strRet;  
}  int main(int argc, char **argv)  
{  // 原始明文    std::string srcText = "this is an example";  std::string encryptText;  std::string encryptHexText;  std::string decryptText;  std::cout << "=== 原始明文 ===" << std::endl;  std::cout << srcText << std::endl;  // md5    std::cout << "=== md5哈希 ===" << std::endl;  md5(srcText, encryptText, encryptHexText);  std::cout << "摘要字符： " << encryptText << std::endl;  std::cout << "摘要串： " << encryptHexText << std::endl;  // sha256    std::cout << "=== sha256哈希 ===" << std::endl;  sha256(srcText, encryptText, encryptHexText);  std::cout << "摘要字符： " << encryptText << std::endl;  std::cout << "摘要串： " << encryptHexText << std::endl;  // des    std::cout << "=== des加解密 ===" << std::endl;  std::string desKey = "12345";  encryptText = des_encrypt(srcText, desKey);  std::cout << "加密字符： " << std::endl;  std::cout << encryptText << std::endl;  decryptText = des_decrypt(encryptText, desKey);  std::cout << "解密字符： " << std::endl;  std::cout << decryptText << std::endl;  // rsa    std::cout << "=== rsa加解密 ===" << std::endl;  std::string key[2];  generateRSAKey(key);  std::cout << "公钥: " << std::endl;  std::cout << key[0] << std::endl;  std::cout << "私钥： " << std::endl;  std::cout << key[1] << std::endl;  encryptText = rsa_pub_encrypt(srcText, key[0]);  std::cout << "加密字符： " << std::endl;  std::cout << encryptText << std::endl;  decryptText = rsa_pri_decrypt(encryptText, key[1]);  std::cout << "解密字符： " << std::endl;  std::cout << decryptText << std::endl;  system("pause");  return 0;  
}
运行结果 

=== 原始明文 ===  
this is an example  === md5哈希 ===  
摘要字符： 乵?驥!範  
摘要串： 9202816dabaaf34bb106a10421b9a0d0  
=== sha256哈希 ===  
摘要字符： 訪X5衽鄁媫j/醢?17?P?4膡zD  
摘要串： d44c035835f1c5e0668b7d186a2ff5b0  
=== des加解密 ===  
加密字符：  
?/灲?取鮋t8:夽U錺?说  
解密字符：  
this is an example  === rsa加解密 ===  
公钥:  
-----BEGIN RSA PUBLIC KEY-----  
MIIBCAKCAQEA59WESdYbPsD6cYATooC4ebClTpvbTsu3X29Ha0g31kW3AmLR2zLj  
hMvdWjUhhVuM7xBoh3Ufoyj4jTGHVhunFfbzxNrt1Nb64N95bZH8e9u6LjJYqh4e  
sNoFknG+McjoSLNqGW9Yd8ejKH1Ju6C9SBUcC43XbB3XdC2matgV1zTsKhqjuywm  
gVN9DZdo2TlZkqsvOHC23rbQ+lP09rpQJ/RI4NQSnCUBqQxErCN85trcWRj1zyJA  
WaBZSvKh7J5RJcrC2ByMDmL7jrDDZl7YEolyW93SSc4xTE9Dr20OXznXNDsfQc9r  
RQHBri8Aqsu4WW3tHSBRmjW5kxFMxS4qxwIBAw==  
-----END RSA PUBLIC KEY-----  私钥：  
-----BEGIN RSA PRIVATE KEY-----  
MIIEowIBAAKCAQEA59WESdYbPsD6cYATooC4ebClTpvbTsu3X29Ha0g31kW3AmLR  
2zLjhMvdWjUhhVuM7xBoh3Ufoyj4jTGHVhunFfbzxNrt1Nb64N95bZH8e9u6LjJY  
qh4esNoFknG+McjoSLNqGW9Yd8ejKH1Ju6C9SBUcC43XbB3XdC2matgV1zTsKhqj  
uywmgVN9DZdo2TlZkqsvOHC23rbQ+lP09rpQJ/RI4NQSnCUBqQxErCN85trcWRj1  
zyJAWaBZSvKh7J5RJcrC2ByMDmL7jrDDZl7YEolyW93SSc4xTE9Dr20OXznXNDsf  
Qc9rRQHBri8Aqsu4WW3tHSBRmjW5kxFMxS4qxwIBAwKCAQEAmo5YMTlnfytRoQAN  
FwB6+8sY3xKSNIfPlPTaR4V6jtkkrEHhPMyXrd0+PCNrrj0In2BFr6NqbMX7CMuv  
jr0aDqSigzyejeSnQJT7nmFS/T0myXblxr6/IJFZDEvUITCa2yJGu5+QT9psxajb  
0mso2ri9XQk6SBPk+B5u8eVj5Myt4tqpWL0DEEDzwfhihs+uEGM7g6bPvQBI4JXu  
8uxfSRUkpyZ5s1koEhqj+RCguksPzSWO/Ut2Sd60iOUMRhya2aEbAyRTtfhsXja3  
4NMWjXorJ0SRkryM1iLJvVWkhkcr2vShH9rm9qz16BkrkI9/9Yx++GNNr6VU/p/+  
Waa8CwKBgQD4m0ryXi6rCqazdCICGoZJGzaljApOZ1rWOiotM9TekaYE7tZ2NDAT  
eytiCzxvs4/+1Jt5XzdGJ035VJKSai/n2ZzAq1YYtVHy5CG2olmeFtwaIWU18m2s  
RjHQf/FiscVB4XdKrHjh3gLgSB8MWMDg/krisxT86HNyp1UE2jZv+QKBgQDuuoez  
V+H23ktb9oDS9HuLXt+wZuww29uNb0jhVoLiqK6M90Pl2u8yErjsq04cG9pF0MUl  
8/nIw4RRKQh9GUOBBbxZqA/1yBxmHTz48siYJ3YXf5HB+0WxxOlEk3s05AnTilTi  
5Y4u9Ptwieoy+TOXatBL9XZgKkpHbcxKZH2gvwKBgQClvNyhlB8cscR3osFWvFmG  
EiRuXVw0ROc5fBweIo3ptm6t9I75eCAM/MeWsihKd7VUjbz7lM+EGjP7jbcMRsqa  
kRMrHOQQeOFMmBZ5wZEUDz1mwO4j9vPILsvgVUuXIS4r66TccvtBPqyVhWoIOytA  
qYdBzLiomvehxONYkXmf+wKBgQCfJwUiOpaklDI9TwCMov0HlJUgRJ115+ezn4Xr  
jwHscHRd+i1D50ohYdCdx4loEpGD4INuoqaF162LcLBTZi0Arn2RGrVOhWhEE337  
TIW6xPlk/7aBUi52g0Ytt6d4mAaNBuNB7l7J+KegW/F3UM0PnIrdTk7qxtwvnogx  
mFPAfwKBgAEuRGqF2Q9bNu/r0OufeFxsYm0zFvWBIxbq3DxPYRtzfhiQMeTOzl1g  
5rowAtb/w1SusGAZ4/lEUZoBgzV+8fr+rpx3eavVCmcXBVjDi9B5nNLIXWkcoEQG  
G/4ZwXUr5kyTBktL6mIBVNJ8dJUQo8xyxK0GjfWhlsk5t/Zu8tmK  
-----END RSA PRIVATE KEY-----  加密字符：  
佷篒?z_?&欗霐嗪K赸;J╄[i9?S絑?て?晄p?[hD∞51鱠,k|1裡郿     犓鈪鑒?饞w2?`vlu  
L<萿囂?圖L潥?O0?佲y▃飕E堿^桮???,e鉀煯A?CsJ挈R聡-鳊帔!eQC乥+1\(齀  
я盈Xj饮[o6覾羂≯傁澓  
解密字符：  
this is an example

注：

（1）在读取公钥文件时，PEM_read_RSA_PUBKEY()函数和PEM_read_RSAPublicKEY()的疑惑。有时候为什么读取私钥文件用的PEM_read_RSAPrivateKey()，针对上述openssl命令生成的公钥文件，在读取其内容时用对称的PEM_read_RSAPublicKEY()接口却会报错，必须要用PEM_read_RSA_PUBKEY()才可以。

          RSA PUBLIC KEY和PUBLIC KEY的两种公钥文件其存储方式是不一样的，PEM_read_RSAPublicKEY()只能读取RSA PUBLIC KEY开头形式的公钥文件（用函数生成的）；而PEM_read_RSA_PUBKEY()只能读取PUBLIC KEY开头格式的公钥文件（用命令行生成），所以公钥私钥读取函数一定要跟生成的密钥对的格式对应起来。

（2）公钥加密和私钥解密， 私钥加密公钥解密 这两种都可以使用

（3）一般加密之后的字符串因为编码跟中文对应不上所以是乱码，在很多场合选择用十六进制串输出

 

（4）实际的工程应用中读取密钥对需要加安全验证

（5）用纯代码不依赖openssl库也是可以自己实现这些加解密算法的，搞清楚原理就行


以上代码为函数格式的公钥和私钥

不同之处在于：

生成密钥对的调用函数不同

 PEM_write_bio_RSAPublicKey(pub, keypair);//函数专用 PEM_write_bio_RSA_PUBKEY(pub, keypair);  //命令行专用

公钥加密的调用函数不同

 rsa = PEM_read_bio_RSAPublicKey(keybio, &rsa, NULL, NULL);  //函数专用
 rsa = PEM_read_bio_RSA_PUBKEY(keybio, &rsa, NULL, NULL); //命令行专用



以下代码为命令行格式的公钥和私钥

 rsa_test_04.cpp : 定义控制台应用程序的入口点。//
#include "stdafx.h"
//
//
//int _tmain(int argc, _TCHAR* argv[])
//{
// return 0;
//}
#include "stdafx.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/engine.h>
#include <openssl/rand.h>
#include <openssl/bio.h>
//#include <unistd.h>
#include <iostream>
#include <io.h>
//#pragma comment(lib,"ws2_32.lib")
const char *g_pPubFile = "public.pem";
const char *g_pPriFile = "private.pem";
//maxCodeByte = g_nBits/8-11
const int g_nBits = 1024;
using namespace std;
#pragma comment(lib,"libeay32.lib")
#pragma comment(lib,"ssleay32.lib")
int MakeKey()
{/*if (access(g_pPubFile,0) != 0 || access(g_pPriFile,0) != 0){return 0;}*///生成key,这里设置了1024，意味着最多可以编解码1024/8-11=117个字节，//RSA_F4为公钥指数，一般情况下使用RSA_F4即可，//其它两个参数可以设置为NULLRSA *pRsa = RSA_generate_key(g_nBits,RSA_F4,NULL,NULL);if (pRsa == NULL){cout << "rsa_generate_key error" << endl;return -1;}BIO *pBio = BIO_new_file(g_pPubFile,"wb");if (pBio == NULL){cout << "BIO_new_file " << g_pPubFile << " error" << endl;return -2;}if(PEM_write_bio_RSAPublicKey(pBio,pRsa) == 0){cout << "write public key error" << endl;return -3;}BIO_free_all(pBio);pBio = BIO_new_file(g_pPriFile,"w");if (pBio == NULL){cout << "BIO_new_file " << g_pPriFile << " error" << endl;return -4;}if(PEM_write_bio_RSAPrivateKey(pBio,pRsa,NULL,NULL,0,NULL,NULL) == 0){cout << "write private key error" << endl;return -5;}BIO_free_all(pBio);RSA_free(pRsa);return 0;
}int MakeKey_test_01()
{/*if (access(g_pPubFile,0) != 0 || access(g_pPriFile,0) != 0){return 0;}*///生成key,这里设置了1024，意味着最多可以编解码1024/8-11=117个字节，//RSA_F4为公钥指数，一般情况下使用RSA_F4即可，//其它两个参数可以设置为NULLRSA *pRsa = RSA_generate_key(g_nBits,RSA_F4,NULL,NULL);if (pRsa == NULL){cout << "rsa_generate_key error" << endl;return -1;}BIO *pBio = BIO_new_file(g_pPubFile,"wb");if (pBio == NULL){cout << "BIO_new_file " << g_pPubFile << " error" << endl;return -2;}PEM_write_bio_RSA_PUBKEY//if(PEM_write_bio_RSAPublicKey(pBio,pRsa) == 0)if(PEM_write_bio_RSA_PUBKEY(pBio,pRsa) == 0){cout << "write public key error" << endl;return -3;}BIO_free_all(pBio);pBio = BIO_new_file(g_pPriFile,"w");if (pBio == NULL){cout << "BIO_new_file " << g_pPriFile << " error" << endl;return -4;}//PEM_write_bio_PKCS8PrivateKeyif(PEM_write_bio_RSAPrivateKey(pBio,pRsa,NULL,NULL,0,NULL,NULL) == 0)//if(PEM_write_bio_PKCS8PrivateKey(pBio,pRsa,NULL,NULL,0,NULL,NULL) == 0){cout << "write private key error" << endl;return -5;}BIO_free_all(pBio);RSA_free(pRsa);return 0;
}
//测试使用PEM_write_bio_RSA_PUBKEY 生成的公钥加密，测试私钥解密
int Enc_test_01(char *in, int inLen, char *out, int &outLen)
{BIO *pBio = BIO_new_file(g_pPubFile,"r");//RSA *pRsa = PEM_read_bio_RSAPublicKey(pBio,NULL,NULL,NULL);RSA *pRsa = PEM_read_bio_RSA_PUBKEY(pBio,NULL,NULL,NULL);BIO_free_all(pBio);outLen = RSA_public_encrypt((RSA_size(pRsa)-11)>inLen?inLen:RSA_size(pRsa)-11,reinterpret_cast<unsigned char*>(in),reinterpret_cast<unsigned char*>(out),pRsa,RSA_PKCS1_PADDING);std::cout << out << std::endl;//RSA_free(pRsa);if(outLen >= 0)return 0;return -1;
}
int Enc(char *in, int inLen, char *out, int &outLen)
{BIO *pBio = BIO_new_file(g_pPubFile,"r");RSA *pRsa = PEM_read_bio_RSAPublicKey(pBio,NULL,NULL,NULL);BIO_free_all(pBio);outLen = RSA_public_encrypt((RSA_size(pRsa)-11)>inLen?inLen:RSA_size(pRsa)-11,reinterpret_cast<unsigned char*>(in),reinterpret_cast<unsigned char*>(out),pRsa,RSA_PKCS1_PADDING);std::cout << out << std::endl;//RSA_free(pRsa);if(outLen >= 0)return 0;return -1;
}int Dec(char *in, int inLen, char *out, int &outLen)
{BIO *pBio = BIO_new_file(g_pPriFile,"r");RSA *pRsa = PEM_read_bio_RSAPrivateKey(pBio,NULL,NULL,NULL);BIO_free_all(pBio);outLen = RSA_private_decrypt(inLen,reinterpret_cast<unsigned char*>(in),reinterpret_cast<unsigned char*>(out),pRsa,RSA_PKCS1_PADDING);//RSA_free(pRsa);if(outLen >= 0)return 0;return -1;
}
//RSA_PUBKEY//test base64int main()
{//MakeKey();//char pOld[100]="for test";//char szEnc[1024] = {0};//int nEncLen = 0;//char szDec[1024] = {0};//int nDecLen = 0;//Enc(pOld,strlen(pOld),szEnc,nEncLen);//Dec(szEnc,nEncLen,szDec,nDecLen);//cout << "decode: " << szDec << endl;
//MakeKey_test_01();
//--Enc_test_01--//char pOld[100]="for test";//char szEnc[1024] = {0};//int nEncLen = 0;//char szDec[1024] = {0};//int nDecLen = 0;//Enc_test_01(pOld,strlen(pOld),szEnc,nEncLen);//Dec(szEnc,nEncLen,szDec,nDecLen);//cout << "decode: " << szDec << endl;cin.get();
}



以上文章借鉴与两位前辈的经验加工而成

传送门：https://www.cnblogs.com/findumars/p/7252839.html

http://blog.csdn.net/cyuyan112233/article/details/45693519

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