C/C++ Crypto密码库调用的实现方法

目录

• Sha256加密算法
• AES 加密与解密
• AES2 加密:
• Base64加解密:
• Hash加密算法
• RSA加密算法
• Crypt库实现RSA加密

Crypto 库是C/C++的加密算法库，这个加密库很流行，基本上涵盖了市面上的各类加密解密算法，以下代码是我在学习是总结的，放到这里用于后期需要时能够快速解决问题。

项目地址：https://www.cryptopp.com/

Sha256加密算法

Sha系列加密算法包括很多，基本上有以下几种格式的加密方式，位数越大加密强度越大，此算法属于单向加密算法与MD5类似但安全性高于MD5。

• SHA-1：生成摘要的性能比MD5略低
• SHA-256：可以生成长度256bit的信息摘要
• SHA-224：可以生成长度224bit的信息摘要
• SHA-384：可以生成长度384bit的信息摘要
• SHA-512：可以生成长度512bit的信息摘要

#include <iostream>
#include <Windows.h>
#include <string>
#include <sha.h>
#include <md5.h>
#include <crc.h>
#include <files.h>
#include <hex.h>

#pragma comment(lib, "cryptlib.lib")
using namespace std;
using namespace CryptoPP;

// 计算文件的 SHA256 值
string CalSHA256_ByFile(char *pszFileName)
{
 string value;
 SHA256 sha256;
 FileSource(pszFileName, true, new HashFilter(sha256, new HexEncoder(new StringSink(value))));
 return value;
}

// 计算数据的 SHA256 值
string CalSHA256_ByMem(PBYTE pData, DWORD dwDataSize)
{
 string value;
 SHA256 sha256;
 StringSource(pData, dwDataSize, true, new HashFilter(sha256, new HexEncoder(new StringSink(value))));
 return value;
}

int main(int argc, char * argv[])
{
 string src = "hello lyshark";
 string dst;

 // 单独计算MD5值的使用
 MD5 md5;
 StringSource(src, true, new HashFilter(md5, new HexEncoder(new StringSink(dst))));
 cout << "计算字符串MD5: " << dst << endl;

 // 单独计算CRC32值
 CRC32 crc32;
 StringSource(src, true, new HashFilter(crc32, new HexEncoder(new StringSink(dst))));
 cout << "计算字符串CRC32: " << dst << endl;

 // 计算一个数组
 BYTE pArrayData[] = { 10, 20, 30, 40, 50 };
 DWORD dwArraySize = sizeof(pArrayData);

 dst.clear();
 StringSource(pArrayData, dwArraySize, true, new HashFilter(md5, new HexEncoder(new StringSink(dst))));
 cout << "计算数组的MD5: " << dst << endl;

 // 直接对文件计算Sha256散列值
 string sha = CalSHA256_ByFile("c://BuidIAT.exe");
 cout << "文件散列值: " << sha << endl;

 // 读入文件到内存后计算
 HANDLE hFile = CreateFile(L"c://BuidIAT.exe", GENERIC_READ, FILE_SHARE_READ, NULL,
  OPEN_EXISTING, FILE_ATTRIBUTE_ARCHIVE, NULL);
 DWORD dwFileSize = GetFileSize(hFile, NULL);
 BYTE *pData = new BYTE[dwFileSize];
 ReadFile(hFile, pData, dwFileSize, NULL, NULL);

 string sha2 = CalSHA256_ByMem(pData, dwFileSize);
 cout << "内存中文件散列值: " << sha2.c_str() << endl;
 system("pause");
 return 0;
}

AES 加密与解密

AES是对称加密，AES可使用16，24或32字节密钥（分别对应128，192和256位）。 Crypto++ 库缺省的密钥长度是16字节，也就是 AES:: DEFAULT_KEYLENGTH。

对于 ECB 和 CBC 模式，处理的数据必须是块大小的倍数。或者，你可以用 StreamTransformationFilter 围绕这个模式对象，并把它作为一个过滤器对象。StreamTransformationFilter 能够缓存数据到块中并根据需要填充。

#include<cryptlib.h>
#include<osrng.h>
#include<iostream>
#include<files.h>
#include<aes.h>
#include<modes.h>
#include<hex.h>

#pragma comment(lib, "cryptlib.lib")
using namespace std;
using namespace CryptoPP;

int main(int argc, char * argv[])
{

 cout << "Key 长度: " << AES::DEFAULT_KEYLENGTH << endl;
 cout << "最小长度: " << AES::MIN_KEYLENGTH << endl;
 cout << "最大长度: " << AES::MAX_KEYLENGTH << endl;
 cout << "Block Size: " << AES::BLOCKSIZE << endl;

 AutoSeededRandomPool rand;

 // 产生一个随机数的密钥
 SecByteBlock Key(0x00, AES::DEFAULT_KEYLENGTH);
 rand.GenerateBlock(Key, Key.size());

 // 产生一个随机的初始向量
 SecByteBlock ival(AES::BLOCKSIZE);
 rand.GenerateBlock(ival, ival.size());

 byte plainText[] = "hello lyshark";
 size_t Textlen = std::strlen((char*)plainText) + 1;
 cout << "待加密字符串长度: " << Textlen << endl;

 // 加密字符串
 CFB_Mode<AES>::Encryption cfbEncryption(Key, Key.size(), ival);
 cfbEncryption.ProcessData(plainText, plainText, Textlen);

 cout << "显示加密后的十六进制数: ";
 StringSource strSource1(plainText, Textlen, true, new HexEncoder(new FileSink(cout)));

 // 解密字符串 并将数据输出到Cout流上
 CFB_Mode<AES>::Decryption cfbDecryption(Key, Key.size(), ival);
 cfbDecryption.ProcessData(plainText, plainText, Textlen);
 cout << endl << "显示解密后的十六进制数: ";
 StringSource strSource2(plainText, Textlen, true, new HexEncoder(new FileSink(cout)));
 cout << endl;

 system("pause");
 return 0;
}

以下代码使用CBC模式加密与解密指定字符串。如果需要针对字符串进行加解密则需要使用以下代码实现.

#include<cryptlib.h>
#include<osrng.h>
#include<iostream>
#include<files.h>
#include<aes.h>
#include<modes.h>
#include<hex.h>

#pragma comment(lib, "cryptlib.lib")
using namespace std;
using namespace CryptoPP;

int main(int argc, char * argv[])
{
 // 开辟空间并将空间赋予初始值0
 byte key[CryptoPP::AES::DEFAULT_KEYLENGTH], iv[CryptoPP::AES::BLOCKSIZE];
 memset(key, 0x00, CryptoPP::AES::DEFAULT_KEYLENGTH);
 memset(iv, 0x00, CryptoPP::AES::BLOCKSIZE);

 // 指定需要加密的字符串与
 std::string plaintext = "hello lyshark this is palintext";
 std::string ciphertext;
 std::string decryptedtext;

 // 输出加密前字符串长度
 std::cout << "加密前字符串长度: " << plaintext.size() << " bytes" << std::endl;
 std::cout << plaintext;
 std::cout << std::endl << std::endl;

 // 创建并开始加密字符串
 CryptoPP::AES::Encryption aesEncryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH);
 CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption, iv);

 CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink(ciphertext));
 stfEncryptor.Put(reinterpret_cast<const unsigned char*>(plaintext.c_str()), plaintext.length());
 stfEncryptor.MessageEnd();

 // 输出密文长度
 std::cout << "加密密文长度: " << ciphertext.size() << " bytes" << std::endl;
 for (int i = 0; i < ciphertext.size(); i++)
 {
  std::cout << "0x" << std::hex << (0xFF & static_cast<byte>(ciphertext[i])) << " ";
 }
 std::cout << std::endl << std::endl;

 // 解密被加密的字符串
 CryptoPP::AES::Decryption aesDecryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH);
 CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption(aesDecryption, iv);

 CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink(decryptedtext));
 stfDecryptor.Put(reinterpret_cast<const unsigned char*>(ciphertext.c_str()), ciphertext.size());
 stfDecryptor.MessageEnd();

 // 输出解密后的字符串长度
 std::cout << "解密后的字符串: " << std::endl;
 std::cout << decryptedtext;
 std::cout << std::endl << std::endl;

 system("pause");
 return 0;
}

下面的示例使用CFB模式实现快速对字符串进行加解密,该模式的数据的长度并不需要是AES的块大小的倍数.

#include<cryptlib.h>
#include<osrng.h>
#include<iostream>
#include<files.h>
#include<aes.h>
#include<modes.h>
#include<hex.h>

#pragma comment(lib, "cryptlib.lib")
using namespace std;
using namespace CryptoPP;

int main(int argc, char * argv[])
{
 AutoSeededRandomPool rand;

 // 生成随机Key
 SecByteBlock key(0x00, AES::DEFAULT_KEYLENGTH);
 rand.GenerateBlock(key, key.size());

 // 生成随机IV值
 byte iv[AES::BLOCKSIZE];
 rand.GenerateBlock(iv, AES::BLOCKSIZE);

 // 需要加密的字符串
 char plainText[] = "hello lyshark";
 int messageLen = (int)strlen(plainText) + 1;

 // 执行快速加密
 CFB_Mode<AES>::Encryption cfbEncryption(key, key.size(), iv);
 cfbEncryption.ProcessData((byte*)plainText, (byte*)plainText, messageLen);
 cout << "加密后的数据: " << plainText << endl;

 // 执行快速解密
 CFB_Mode<AES>::Decryption cfbDecryption(key, key.size(), iv);
 cfbDecryption.ProcessData((byte*)plainText, (byte*)plainText, messageLen);
 cout << "解密后的数据: " << plainText << endl;

 system("pause");
 return 0;
}

AES2 加密:

#include<cryptlib.h>
#include<iostream>
#include <Windows.h>

#pragma comment(lib, "cryptlib.lib")
using namespace std;
using namespace CryptoPP;

// AES加密
BOOL AesEncrypt(BYTE *pPassword, DWORD dwPasswordLength, BYTE *pData, DWORD &dwDataLength, DWORD dwBufferLength)
{
 BOOL bRet = TRUE;
 HCRYPTPROV hCryptProv = NULL;
 HCRYPTHASH hCryptHash = NULL;
 HCRYPTKEY hCryptKey = NULL;
 do
 {
  // 获取CSP句柄
  bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT);
  if (FALSE == bRet)
   break;

  // 创建HASH对象
  bRet = CryptCreateHash(hCryptProv, CALG_MD5, NULL, 0, &hCryptHash);
  if (FALSE == bRet)
   break;

  // 对密钥进行HASH计算
  bRet = CryptHashData(hCryptHash, pPassword, dwPasswordLength, 0);
  if (FALSE == bRet)
   break;

  // 使用HASH来生成密钥
  bRet = CryptDeriveKey(hCryptProv, CALG_AES_128, hCryptHash, CRYPT_EXPORTABLE, &hCryptKey);
  if (FALSE == bRet)
   break;

  // 加密数据
  bRet = CryptEncrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength, dwBufferLength);
  if (FALSE == bRet)
   break;
 } while (FALSE);

 // 关闭释放
 if (hCryptKey)
  CryptDestroyKey(hCryptKey);
 if (hCryptHash)
  CryptDestroyHash(hCryptHash);
 if (hCryptProv)
  CryptReleaseContext(hCryptProv, 0);
 return bRet;
}

// AES解密
BOOL AesDecrypt(BYTE *pPassword, DWORD dwPasswordLength, BYTE *pData, DWORD &dwDataLength, DWORD dwBufferLength)
{
 BOOL bRet = TRUE;
 HCRYPTPROV hCryptProv = NULL;
 HCRYPTHASH hCryptHash = NULL;
 HCRYPTKEY hCryptKey = NULL;

 do
 {
  // 获取CSP句柄
  bRet = ::CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT);
  if (FALSE == bRet)
   break;

  // 创建HASH对象
  bRet = CryptCreateHash(hCryptProv, CALG_MD5, NULL, 0, &hCryptHash);
  if (FALSE == bRet)
   break;

  // 对密钥进行HASH计算
  bRet = CryptHashData(hCryptHash, pPassword, dwPasswordLength, 0);
  if (FALSE == bRet)
   break;

  // 使用HASH来生成密钥
  bRet = CryptDeriveKey(hCryptProv, CALG_AES_128, hCryptHash, CRYPT_EXPORTABLE, &hCryptKey);
  if (FALSE == bRet)
   break;

  // 解密数据
  bRet = CryptDecrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength);
  if (FALSE == bRet)
   break;
 } while (FALSE);

 // 关闭释放
 if (hCryptKey)
  CryptDestroyKey(hCryptKey);
 if (hCryptHash)
  CryptDestroyHash(hCryptHash);
 if (hCryptProv)
  CryptReleaseContext(hCryptProv, 0);
 return bRet;
}

int main(int argc, char * argv[])
{
 BYTE pData[MAX_PATH] = { 0 };
 DWORD dwDataLength = 0, dwBufferLength = MAX_PATH;

 lstrcpy((char *)pData, "hello lyshark");
 dwDataLength = 1 + lstrlen((char *)pData);

 // 原始十六进制数据
 printf("AES 原始数据 [%d]: ", dwDataLength);
 for (int i = 0; i < dwDataLength; i++)
 {
  printf("%02x ", pData[i]);
 }
 printf("\n\n");

 // AES 加密
 AesEncrypt((BYTE *)"AAAVCDERFGTYHUJI", 16, pData, dwDataLength, dwBufferLength);
 printf("AES 加密后 [%d]: ", dwDataLength);
 for (int i = 0; i < dwDataLength; i++)
 {
  printf("%02x ", pData[i]);
 }
 printf("\n\n");

 // AES 解密
 AesDecrypt((BYTE *)"AAAVCDERFGTYHUJI", 16, pData, dwDataLength, dwBufferLength);
 printf("AES 解密后 [%d]: ", dwDataLength);
 for (int i = 0; i < dwDataLength; i++)
 {
  printf("%02x ", pData[i]);
 }
 system("pause");
 return 0;
}

Base64加解密:

#include<cryptlib.h>
#include<osrng.h>
#include<iostream>
#include <Windows.h>
#include<files.h>
#include<base64.h>
#include<modes.h>
#include<hex.h>

#pragma comment(lib, "cryptlib.lib")
using namespace std;
using namespace CryptoPP;

void DisplayHex(BYTE *pData, DWORD dwSize)
{
 for (int i = 0; i < dwSize; i++)
 {
  if ((0 != i) && (0 == i % 16))
   printf("\n");
  else if ((0 != i) && (0 == i % 8))
   printf(" ");
  printf("%02X ", pData[i]);
 }
 printf("\n");
}

int main(int argc, char * argv[])
{
 unsigned char plainText[] = "hello lyshark";

 // 对字符串编码
 string encoded;
 Base64Encoder encoder;
 encoder.Put(plainText, sizeof(plainText));
 encoder.MessageEnd();

 word64 size = encoder.MaxRetrievable();
 if (size)
 {
  encoded.resize(size);
  encoder.Get((byte *)&encoded[0], encoded.size());
 }
 cout << "编码后的数据: " << encoded << endl;

 // 对字符串解码
 string decoded;
 Base64Decoder decoder;
 decoder.Put((byte *)encoded.data(), encoded.size());
 decoder.MessageEnd();

 size = decoder.MaxRetrievable();
 if (size && size <= SIZE_MAX)
 {
  decoded.resize(size);
  decoder.Get((byte *)&decoded[0], decoded.size());
 }
 cout << "对字符串解码: " << decoded;

 // 输出解码字符串的十六进制格式
 char szOriginalData[] = "hello lyshark";

 cout << "字符串十六进制格式: ";
 DisplayHex((BYTE *)szOriginalData, (1 + lstrlen(szOriginalData)));

 system("pause");
 return 0;
}

Hash加密算法

使用hash算法计算特定文件的Hash值.

#include<cryptlib.h>
#include<iostream>
#include <Windows.h>

#pragma comment(lib, "cryptlib.lib")
using namespace std;
using namespace CryptoPP;

BOOL GetFileData(char *pszFilePath, BYTE **ppFileData, DWORD *pdwFileDataLength)
{
 BOOL bRet = TRUE;
 BYTE *pFileData = NULL;
 DWORD dwFileDataLength = 0;
 HANDLE hFile = NULL;
 DWORD dwTemp = 0;

 do
 {
  hFile = CreateFile(pszFilePath, GENERIC_READ | GENERIC_WRITE,FILE_SHARE_READ |
   FILE_SHARE_WRITE, NULL, OPEN_EXISTING,FILE_ATTRIBUTE_ARCHIVE, NULL);
  if (INVALID_HANDLE_VALUE == hFile)
  {
   bRet = FALSE;
   break;
  }

  dwFileDataLength = ::GetFileSize(hFile, NULL);
  pFileData = new BYTE[dwFileDataLength];
  if (NULL == pFileData)
  {
   bRet = FALSE;
   break;
  }
  RtlZeroMemory(pFileData, dwFileDataLength);
  ReadFile(hFile, pFileData, dwFileDataLength, &dwTemp, NULL);

  // 返回
  *ppFileData = pFileData;
  *pdwFileDataLength = dwFileDataLength;
 } while (FALSE);

 if (hFile)
  CloseHandle(hFile);
 return bRet;
}

BOOL CalculateHash(BYTE *pData, DWORD dwDataLength, ALG_ID algHashType,
 BYTE **ppHashData, DWORD *pdwHashDataLength)
{
 HCRYPTPROV hCryptProv = NULL;
 HCRYPTHASH hCryptHash = NULL;
 BYTE *pHashData = NULL;
 DWORD dwHashDataLength = 0;
 DWORD dwTemp = 0;
 BOOL bRet = FALSE;

 do
 {
  // 获得指定CSP的密钥容器的句柄
  bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT);
  if (FALSE == bRet)
   break;

  // 创建一个HASH对象, 指定HASH算法
  bRet = CryptCreateHash(hCryptProv, algHashType, NULL, NULL, &hCryptHash);
  if (FALSE == bRet)
   break;

  // 计算HASH数据
  bRet = ::CryptHashData(hCryptHash, pData, dwDataLength, 0);
  if (FALSE == bRet)
   break;

  // 获取HASH结果的大小
  dwTemp = sizeof(dwHashDataLength);
  bRet = ::CryptGetHashParam(hCryptHash, HP_HASHSIZE, (BYTE *)(&dwHashDataLength), &dwTemp, 0);
  if (FALSE == bRet)
   break;

  // 申请内存
  pHashData = new BYTE[dwHashDataLength];
  if (NULL == pHashData)
  {
   bRet = FALSE;
   break;
  }
  RtlZeroMemory(pHashData, dwHashDataLength);

  // 获取HASH结果数据
  bRet = CryptGetHashParam(hCryptHash, HP_HASHVAL, pHashData, &dwHashDataLength, 0);
  if (FALSE == bRet)
   break;

  // 返回数据
  *ppHashData = pHashData;
  *pdwHashDataLength = dwHashDataLength;

 } while (FALSE);

 // 释放关闭
 if (FALSE == bRet)
 {
  if (pHashData)
  {
   delete[]pHashData;
   pHashData = NULL;
  }
 }
 if (hCryptHash)
  CryptDestroyHash(hCryptHash);
 if (hCryptProv)
  CryptReleaseContext(hCryptProv, 0);
 return bRet;
}

int main(int argc, char * argv[])
{
 BYTE *pData = NULL;
 DWORD dwDataLength = 0;
 BYTE *pHashData = NULL;
 DWORD dwHashDataLength = 0;

 // 获取文件流数据
 GetFileData("c://BuidIAT.exe", &pData, &dwDataLength);

 // 计算 MD5
 CalculateHash(pData, dwDataLength, CALG_MD5, &pHashData, &dwHashDataLength);
 printf("MD5 Hash -> ");
 for (int i = 0; i < dwHashDataLength; i++)
  printf("%x", pHashData[i]);
 printf("\n\n", dwHashDataLength);
 if (pHashData)
 {
  delete[]pHashData;
  pHashData = NULL;
 }

 // 计算 SHA1
 CalculateHash(pData, dwDataLength, CALG_SHA1, &pHashData, &dwHashDataLength);
 printf("SHA1 -> ");
 for (int i = 0; i < dwHashDataLength; i++)
  printf("%x", pHashData[i]);
 printf("\n\n", dwHashDataLength);
 if (pHashData)
 {
  delete[]pHashData;
  pHashData = NULL;
 }

 // 计算 SHA256
 CalculateHash(pData, dwDataLength, CALG_SHA_256, &pHashData, &dwHashDataLength);
 printf("SHA256 -> ");
 for (int i = 0; i < dwHashDataLength; i++)
  printf("%x", pHashData[i]);
 printf("\n\n", dwHashDataLength);
 if (pHashData)
 {
  delete[]pHashData;
  pHashData = NULL;
 }
 system("pause");
 return 0;
}

RSA加密算法

RSA算法包括公钥与私钥两部,加密时会先使用RSA生成公钥与私钥,然后在进行加密.

#include<iostream>
#include <Windows.h>

using namespace std;

// 生成公钥和私钥
BOOL GenerateKey(BYTE **ppPublicKey, DWORD *pdwPublicKeyLength, BYTE **ppPrivateKey, DWORD *pdwPrivateKeyLength)
{
 BOOL bRet = TRUE;
 HCRYPTPROV hCryptProv = NULL;
 HCRYPTKEY hCryptKey = NULL;
 BYTE *pPublicKey = NULL;
 DWORD dwPublicKeyLength = 0;
 BYTE *pPrivateKey = NULL;
 DWORD dwPrivateKeyLength = 0;

 do
 {
  // 获取CSP句柄
  bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0);
  if (FALSE == bRet)
   break;

  // 生成公私密钥对
  bRet = CryptGenKey(hCryptProv, AT_KEYEXCHANGE, CRYPT_EXPORTABLE, &hCryptKey);
  if (FALSE == bRet)
   break;

  // 获取公钥密钥的长度和内容
  bRet = CryptExportKey(hCryptKey, NULL, PUBLICKEYBLOB, 0, NULL, &dwPublicKeyLength);
  if (FALSE == bRet)
   break;

  pPublicKey = new BYTE[dwPublicKeyLength];
  RtlZeroMemory(pPublicKey, dwPublicKeyLength);
  bRet = CryptExportKey(hCryptKey, NULL, PUBLICKEYBLOB, 0, pPublicKey, &dwPublicKeyLength);
  if (FALSE == bRet)
   break;

  // 获取私钥密钥的长度和内容
  bRet = CryptExportKey(hCryptKey, NULL, PRIVATEKEYBLOB, 0, NULL, &dwPrivateKeyLength);
  if (FALSE == bRet)
   break;

  pPrivateKey = new BYTE[dwPrivateKeyLength];
  RtlZeroMemory(pPrivateKey, dwPrivateKeyLength);
  bRet = CryptExportKey(hCryptKey, NULL, PRIVATEKEYBLOB, 0, pPrivateKey, &dwPrivateKeyLength);
  if (FALSE == bRet)
   break;

  // 返回数据
  *ppPublicKey = pPublicKey;
  *pdwPublicKeyLength = dwPublicKeyLength;
  *ppPrivateKey = pPrivateKey;
  *pdwPrivateKeyLength = dwPrivateKeyLength;

 } while (FALSE);

 // 释放关闭
 if (hCryptKey)
  CryptDestroyKey(hCryptKey);
 if (hCryptProv)
  CryptReleaseContext(hCryptProv, 0);
 return bRet;
}

// 公钥加密数据
BOOL RsaEncrypt(BYTE *pPublicKey, DWORD dwPublicKeyLength, BYTE *pData, DWORD &dwDataLength, DWORD dwBufferLength)
{
 BOOL bRet = TRUE;
 HCRYPTPROV hCryptProv = NULL;
 HCRYPTKEY hCryptKey = NULL;

 do
 {
  // 获取CSP句柄
  bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0);
  if (FALSE == bRet)
   break;

  // 导入公钥
  bRet = CryptImportKey(hCryptProv, pPublicKey, dwPublicKeyLength, NULL, 0, &hCryptKey);
  if (FALSE == bRet)
   break;

  // 加密数据
  bRet = CryptEncrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength, dwBufferLength);
  if (FALSE == bRet)
   break;
 } while (FALSE);

 // 释放并关闭
 if (hCryptKey)
  CryptDestroyKey(hCryptKey);
 if (hCryptProv)
  CryptReleaseContext(hCryptProv, 0);
 return bRet;
}

// 私钥解密数据
BOOL RsaDecrypt(BYTE *pPrivateKey, DWORD dwProvateKeyLength, BYTE *pData, DWORD &dwDataLength)
{
 BOOL bRet = TRUE;
 HCRYPTPROV hCryptProv = NULL;
 HCRYPTKEY hCryptKey = NULL;

 do
 {
  // 获取CSP句柄
  bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0);
  if (FALSE == bRet)
   break;

  // 导入私钥
  bRet = CryptImportKey(hCryptProv, pPrivateKey, dwProvateKeyLength, NULL, 0, &hCryptKey);
  if (FALSE == bRet)
   break;

  // 解密数据
  bRet = CryptDecrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength);
  if (FALSE == bRet)
   break;
 } while (FALSE);

 // 释放并关闭
 if (hCryptKey)
  CryptDestroyKey(hCryptKey);
 if (hCryptProv)
  CryptReleaseContext(hCryptProv, 0);
 return bRet;
}

int main(int argc, char * argv[])
{
 BYTE *pPublicKey = NULL;
 DWORD dwPublicKeyLength = 0;
 BYTE *pPrivateKey = NULL;
 DWORD dwPrivateKeyLength = 0;
 BYTE *pData = NULL;
 DWORD dwDataLength = 0;
 DWORD dwBufferLength = 4096;

 pData = new BYTE[dwBufferLength];

 RtlZeroMemory(pData, dwBufferLength);
 lstrcpy((char *)pData, "hello lyshark");
 dwDataLength = 1 + lstrlen((char *)pData);

 // 输出加密前原始数据
 printf("加密前原始数据: ");
 for (int i = 0; i < dwDataLength; i++)
  printf("%x", pData[i]);
 printf("\n\n");

 // 生成公钥和私钥
 GenerateKey(&pPublicKey, &dwPublicKeyLength, &pPrivateKey, &dwPrivateKeyLength);
 printf("公钥: ");
 for (int i = 0; i < dwPublicKeyLength; i++)
  printf("%.2x", pPublicKey[i]);
 printf("\n\n");

 printf("私钥: ");
 for (int i = 0; i < dwPrivateKeyLength; i++)
  printf("%.2x", pPrivateKey[i]);
 printf("\n\n");

 // 使用公钥加密
 RsaEncrypt(pPublicKey, dwPublicKeyLength, pData, dwDataLength, dwBufferLength);
 printf("公钥加密: ");
 for (int i = 0; i < dwDataLength; i++)
  printf("%x", pData[i]);
 printf("\n\n");

 // 使用私钥解密
 RsaDecrypt(pPrivateKey, dwPrivateKeyLength, pData, dwDataLength);
 printf("私钥解密: ");
 for (int i = 0; i < dwDataLength; i++)
  printf("%x", pData[i]);
 printf("\n\n");

 delete[]pData;
 delete[]pPrivateKey;
 delete[]pPublicKey;

 system("pause");
 return 0;
}

Crypt库实现RSA加密

RSA加密一般使用公钥加密私钥解密,先生成公钥与私钥,然后使用这两份密钥对字符串等数据进行操作.

#include<cryptlib.h>
#include<osrng.h>
#include<iostream>
#include<files.h>
#include <Windows.h>
#include <rsa.h>
#include <hex.h>
#include<modes.h>

#pragma comment(lib, "cryptlib.lib")
using namespace std;
using namespace CryptoPP;

// 定义全局随机数池
RandomPool & GlobalRNG();
RandomPool & GlobalRNG()
{
 static RandomPool randomPool;
 return randomPool;
}

// 生成RSA密钥对
BOOL GenerateRSAKey(DWORD dwRSAKeyLength, char *pszPrivateKeyFileName, char *pszPublicKeyFileName, BYTE *pSeed, DWORD dwSeedLength)
{
 RandomPool randPool;
 randPool.Put(pSeed, dwSeedLength);

 // 生成RSA私钥
 RSAES_OAEP_SHA_Decryptor priv(randPool, dwRSAKeyLength);
 HexEncoder privFile(new FileSink(pszPrivateKeyFileName)); // 打开文件实行序列化操作

 priv.DEREncode(privFile);
 privFile.MessageEnd();

 // 生成RSA公钥
 RSAES_OAEP_SHA_Encryptor pub(priv);
 HexEncoder pubFile(new FileSink(pszPublicKeyFileName));  // 打开文件实行序列化操作

 pub.DEREncode(pubFile);          // 写密码对象pub到文件对象pubFile里
 pubFile.MessageEnd();
 return TRUE;
}

/* 此处的加密算法是通过文件中的公钥与私钥进行加密的*/
// RSA加密字符串
string RSA_Encrypt_ByFile(char *pszOriginaString, char *pszPublicKeyFileName, BYTE *pSeed, DWORD dwSeedLength)
{
 RandomPool randPool;
 randPool.Put(pSeed, dwSeedLength);

 FileSource pubFile(pszPublicKeyFileName, TRUE, new HexDecoder);
 RSAES_OAEP_SHA_Encryptor pub(pubFile);

 // 加密
 string strEncryptString;
 StringSource(pszOriginaString, TRUE, new PK_EncryptorFilter(randPool, pub, new HexEncoder(new StringSink(strEncryptString))));
 return strEncryptString;
}
// RSA解密字符串
string RSA_Decrypt_ByFile(char *pszEncryptString, char *pszPrivateKeyFileName)
{
 FileSource privFile(pszPrivateKeyFileName, TRUE, new HexDecoder);
 RSAES_OAEP_SHA_Decryptor priv(privFile);

 string strDecryptString;
 StringSource(pszEncryptString, TRUE, new HexDecoder(new PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(strDecryptString))));
 return strDecryptString;
}

/* 通过在内存中的密钥对进行加密与解密 */
// RSA加密字符串
string RSA_Encrypt_ByMem(char *pszOriginaString, char *pszMemPublicKey, BYTE *pSeed, DWORD dwSeedLength)
{
 RandomPool randPool;
 randPool.Put(pSeed, dwSeedLength);

 StringSource pubStr(pszMemPublicKey, TRUE, new HexDecoder);
 RSAES_OAEP_SHA_Encryptor pub(pubStr);

 // 加密
 string strEncryptString;
 StringSource(pszOriginaString, TRUE, new PK_EncryptorFilter(randPool, pub, new HexEncoder(new StringSink(strEncryptString))));
 return strEncryptString;
}
// RSA解密字符串
string RSA_Decrypt_ByMem(char *pszEncryptString, char *pszMemPrivateKey)
{
 StringSource privStr(pszMemPrivateKey, TRUE, new HexDecoder);
 RSAES_OAEP_SHA_Decryptor priv(privStr);

 string strDecryptString;
 StringSource(pszEncryptString, TRUE, new HexDecoder(new PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(strDecryptString))));
 return strDecryptString;
}

int main(int argc, char * argv[])
{
 // 指定公钥与私钥所在文件目录
 char szPrivateFile[] = "c://private.key";
 char szPublicFile[] = "c://public.key";

 // 指定一串随机数种子
 char szSeed[] = "ABCDESGHETYSQDGH";

 // 以下就是待加密的字符串
 char szOriginalString[] = "hello lyshark";

 /* 此处是从文件中读取出公钥与私钥对特定字符串进行加密与解密 */
 // 生成RSA公私密钥对
 GenerateRSAKey(1024, szPrivateFile, szPublicFile, (BYTE *)szSeed, lstrlen(szSeed));

 // RSA公钥加密字符串
 string strEncryptString = RSA_Encrypt_ByFile(szOriginalString, szPublicFile, (BYTE *)szSeed, lstrlen(szSeed));

 // RSA私钥解密字符串
 string strDecryptString = RSA_Decrypt_ByFile((char *)strEncryptString.c_str(), szPrivateFile);

 // 显示
 printf("原文字符串:\t[%d]%s\n", lstrlen(szOriginalString), szOriginalString);
 printf("密文字符串:\t[%d]%s\n", strEncryptString.length(), strEncryptString.c_str());
 printf("明文字符串:\t[%d]%s\n", strDecryptString.length(), strDecryptString.c_str());
 printf("\n\n");

 // --------------------------------------------------------------------------------------------------------------
 /* 此处是在内存中对指定字符串进行解密*/
 char g_szPubKey[] = "填充公钥";
 char g_szPrivKey[] = "填充私钥";

 // RSA公钥加密字符串
 string strEncryptString_Mem = RSA_Encrypt_ByMem(szOriginalString, g_szPubKey, (BYTE *)szSeed, ::lstrlen(szSeed));
 // RSA私钥解密字符串
 string strDecryptString_Mem = RSA_Decrypt_ByMem((char *)strEncryptString_Mem.c_str(), g_szPrivKey);
 // 显示
 printf("原文字符串:\n[%d]%s\n", ::lstrlen(szOriginalString), szOriginalString);
 printf("密文字符串:\n[%d]%s\n", strEncryptString_Mem.length(), strEncryptString_Mem.c_str());
 printf("明文字符串:\n[%d]%s\n", strDecryptString_Mem.length(), strDecryptString_Mem.c_str());
 system("pause");
 return 0;

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