C/C++ 常用加解密算法收集

网上收集的一些开发常用的加密解密算法的使用技巧，第三方库 Crypto 也可实现

Base64加密1

base64.h

代码语言：javascript复制

#ifndef base64_h
#define base64_h

#include <stdio.h>
#include <Windows.h>
#include <stdlib.h>

#if __cplusplus
extern "C"{
#endif
	// base64 转换表, 共64个
	static const char base64_alphabet[] = {
		'A', 'B', 'C', 'D', 'E', 'F', 'G',
		'H', 'I', 'J', 'K', 'L', 'M', 'N',
		'O', 'P', 'Q', 'R', 'S', 'T',
		'U', 'V', 'W', 'X', 'Y', 'Z',
		'a', 'b', 'c', 'd', 'e', 'f', 'g',
		'h', 'i', 'j', 'k', 'l', 'm', 'n',
		'o', 'p', 'q', 'r', 's', 't',
		'u', 'v', 'w', 'x', 'y', 'z',
		'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
		' ', '/' };

	// 解码时使用
	static const unsigned char base64_suffix_map[256] = {
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 253, 255,
		255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 253, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
		52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
		255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
		7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
		19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
		255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
		37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
		49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
		255, 255, 255, 255 };

	static char cmove_bits(unsigned char src, unsigned lnum, unsigned rnum) {
		src <<= lnum; // src = src << lnum;
		src >>= rnum; // src = src >> rnum;
		return src;
	}

	int base64_encode(const char *indata, int inlen, char *outdata, int *outlen) {

		int ret = 0; // return value
		if (indata == NULL || inlen == 0) {
			return ret = -1;
		}

		int in_len = 0; // 源字符串长度, 如果in_len不是3的倍数, 那么需要补成3的倍数
		int pad_num = 0; // 需要补齐的字符个数, 这样只有2, 1, 0(0的话不需要拼接, )
		if (inlen % 3 != 0) {
			pad_num = 3 - inlen % 3;
		}
		in_len = inlen   pad_num; // 拼接后的长度, 实际编码需要的长度(3的倍数)
		int out_len = in_len * 8 / 6; // 编码后的长度
		char *p = outdata; // 定义指针指向传出data的首地址

		//编码, 长度为调整后的长度, 3字节一组
		for (int i = 0; i < in_len; i  = 3) {
			int value = *indata >> 2; // 将indata第一个字符向右移动2bit(丢弃2bit)
			char c = base64_alphabet[value]; // 对应base64转换表的字符
			*p = c; // 将对应字符(编码后字符)赋值给outdata第一字节

			//处理最后一组(最后3字节)的数据
			if (i == inlen   pad_num - 3 && pad_num != 0) {
				if (pad_num == 1) {
					*(p   1) = base64_alphabet[(int)(cmove_bits(*indata, 6, 2)   cmove_bits(*(indata   1), 0, 4))];
					*(p   2) = base64_alphabet[(int)cmove_bits(*(indata   1), 4, 2)];
					*(p   3) = '=';
				}
				else if (pad_num == 2) { // 编码后的数据要补两个 '='
					*(p   1) = base64_alphabet[(int)cmove_bits(*indata, 6, 2)];
					*(p   2) = '=';
					*(p   3) = '=';
				}
			}
			else { // 处理正常的3字节的数据
				*(p   1) = base64_alphabet[cmove_bits(*indata, 6, 2)   cmove_bits(*(indata   1), 0, 4)];
				*(p   2) = base64_alphabet[cmove_bits(*(indata   1), 4, 2)   cmove_bits(*(indata   2), 0, 6)];
				*(p   3) = base64_alphabet[*(indata   2) & 0x3f];
			}
			p  = 4;
			indata  = 3;
		}
		if (outlen != NULL) {
			*outlen = out_len;
		}
		return ret;
	}

	int base64_decode(const char *indata, int inlen, char *outdata, int *outlen) {

		int ret = 0;
		if (indata == NULL || inlen <= 0 || outdata == NULL || outlen == NULL) {
			return ret = -1;
		}
		if (inlen % 4 != 0) { // 需要解码的数据不是4字节倍数
			return ret = -2;
		}

		int t = 0, x = 0, y = 0, i = 0;
		unsigned char c = 0;
		int g = 3;

		while (indata[x] != 0) {
			// 需要解码的数据对应的ASCII值对应base64_suffix_map的值
			c = base64_suffix_map[indata[x  ]];
			if (c == 255) return -1;// 对应的值不在转码表中
			if (c == 253) continue;// 对应的值是换行或者回车
			if (c == 254) { c = 0; g--; }// 对应的值是'='
			t = (t << 6) | c; // 将其依次放入一个int型中占3字节
			if (  y == 4) {
				outdata[i  ] = (unsigned char)((t >> 16) & 0xff);
				if (g > 1) outdata[i  ] = (unsigned char)((t >> 8) & 0xff);
				if (g > 2) outdata[i  ] = (unsigned char)(t & 0xff);
				y = t = 0;
			}
		}
		if (outlen != NULL) {
			*outlen = i;
		}
		return ret;
	}
#if __cplusplus
}
#endif

#endif /* base64_h */

main.c

代码语言：javascript复制

#include "base64.h"

int main(int argc, const char * argv[])
{
	char str1[] = "https://www.baidu.com";
	char str3[30] = { 0 };
	char str2[30] = { 0 };
	int len = 0;
	
	base64_encode(str1, (int)strlen(str1), str2, &len);
	printf("加密后: %s 长度: %dn", str2, len);

	base64_decode(str2, (int)strlen(str2), str3, &len);
	printf("解密后: %s 长度: %dn", str3, len);

	system("pause");
	return 0;
}

Base64加密2

代码语言：javascript复制

#include <string.h>

#define OK 0
#define ERR -1
#define DECODE_SRC_LEN  4
#define DECODE_RET_LEN  3
#define BASE_SRC_LEN  3
#define BASE_DST_LEN  4

/*
A~Z,a~z,0~9, /
*/
char Base64ToAsc(char c)
{
	if (c >= 'A' && c <= 'Z')
	{
		return c - 'A';
	}
	else if (c >= 'a' && c <= 'z')
	{
		return 26   c - 'a';
	}
	else if (c >= '0' && c <= '9')
	{
		return 52   c - '0';
	}
	else if (c == ' ')
	{
		return 62;
	}
	else if (c == '/')
	{
		return 63;
	}
	else
	{
		return c;
	}

}

//szSrc[] 长度必然能被 4 整除
int DecodeBase64(char szRet[], char szSrc[], int iLen)
{
	int  iLoop = iLen / DECODE_SRC_LEN;
	int  iSrcOffset;
	int  iRetOffset;
	int  i;
	int  j;
	char szTmp[DECODE_SRC_LEN] = { 0 };


	for (i = 0; i < iLoop; i  )
	{
		iSrcOffset = i * DECODE_SRC_LEN;
		iRetOffset = i * DECODE_RET_LEN;

		for (j = 0; j < DECODE_SRC_LEN; j  )
		{
			szTmp[j] = Base64ToAsc(szSrc[iSrcOffset   j]);
		}

		szRet[iRetOffset] = (szTmp[0] << 2) | (szTmp[1] >> 4);

		if (szTmp[2] == '=')
		{
			szRet[iRetOffset   1] = 0;
			break;
		}
		szRet[iRetOffset   1] = (szTmp[1] << 4) | (szTmp[2] >> 2);

		if (szTmp[3] == '=')
		{
			szRet[iRetOffset   2] = 0;
			break;
		}
		szRet[iRetOffset   2] = (szTmp[2] << 6) | (szTmp[3]);
	}
	return OK;
}

typedef struct Base64Cov
{
	unsigned int sect1 : 6;
	unsigned int sect2 : 6;
	unsigned int sect3 : 6;
	unsigned int sect4 : 6;
}BASE64COV_S;

/*
30~25  映射到 A~Z ,
26~51 映射到 a~z ,
52~61映射到 0~9,
62映射到 ，
63 映射到
*/
char g_acBaseMap[] = "ABCD...Za...z0..9 /";

char ConvertToBase64(char c)
{
	if (c < 26)
	{
		return 'A'   c;
	}
	else if (c < 52)
	{
		return 'a'   (c - 26);
	}
	else if (c < 62)
	{
		return '0'   (c - 52);
	}
	else if (c == 62)
	{
		return ' ';
	}
	else
	{
		return '/';
	}
}

//把 szSrc 每3个字符编码成 4个字符
int  EncodeBase64(char szRet[], char szSrc[], int iSrcLen)
{
	BASE64COV_S  *pBase;
	char szTmp[BASE_SRC_LEN] = { 'a', 'b', 'c' };
	int iLoop = iSrcLen / BASE_SRC_LEN;
	int iSrcOffSet;
	int iRetOffSet;
	int i;


	for (i = 0; i < iLoop; i  )
	{
		//3个字符逆序放入szTmp
		iSrcOffSet = i*BASE_SRC_LEN;
		iRetOffSet = i*BASE_DST_LEN;

		szTmp[0] = *(szSrc   iSrcOffSet   2);
		szTmp[1] = *(szSrc   iSrcOffSet   1);
		szTmp[2] = *(szSrc   iSrcOffSet);

		pBase = (BASE64COV_S  *)szTmp;
		szRet[i*BASE_DST_LEN] = ConvertToBase64(pBase->sect4);
		szRet[i*BASE_DST_LEN   1] = ConvertToBase64(pBase->sect3);
		szRet[i*BASE_DST_LEN   2] = ConvertToBase64(pBase->sect2);
		szRet[i*BASE_DST_LEN   3] = ConvertToBase64(pBase->sect1);
	}

	if (iSrcLen % BASE_SRC_LEN == 1)
	{
		iSrcOffSet  = BASE_SRC_LEN;
		iRetOffSet  = BASE_DST_LEN;

		szTmp[0] = 0;
		szTmp[1] = 0;
		szTmp[2] = *(szSrc   iSrcOffSet);

		pBase = (BASE64COV_S  *)szTmp;
		szRet[i*BASE_DST_LEN] = ConvertToBase64(pBase->sect4);
		szRet[i*BASE_DST_LEN   1] = ConvertToBase64(pBase->sect3);
		szRet[i*BASE_DST_LEN   2] = '=';
		szRet[i*BASE_DST_LEN   3] = '=';
	}
	else if (iSrcLen % BASE_SRC_LEN == 2)
	{
		iSrcOffSet  = BASE_SRC_LEN;
		iRetOffSet  = BASE_DST_LEN;

		szTmp[0] = 0;
		szTmp[1] = *(szSrc   iSrcOffSet   1);
		szTmp[2] = *(szSrc   iSrcOffSet);

		pBase = (BASE64COV_S  *)szTmp;
		szRet[i*BASE_DST_LEN] = ConvertToBase64(pBase->sect4);
		szRet[i*BASE_DST_LEN   1] = ConvertToBase64(pBase->sect3);
		szRet[i*BASE_DST_LEN   2] = ConvertToBase64(pBase->sect2);
		szRet[i*BASE_DST_LEN   3] = '=';
	}

	return OK;
}

#define TEST_LEN 100
int _tmain(int argc, _TCHAR* argv[])
{
	char szSrc[] = "abcde";
	char szMid[TEST_LEN] = { 0 };
	char szRet[TEST_LEN] = { 0 };

	printf("SRC :%sn", szSrc);
	EncodeBase64(szMid, szSrc, strlen(szSrc));
	printf("Encode:%sn", szMid);
	DecodeBase64(szRet, szMid, strlen(szMid));
	printf("Decode:%sn", szRet);

	getchar();
	return 0;
}

AES 加解密

代码语言：javascript复制

#include <stdio.h>
#include <Windows.h>

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

	do
	{
		// 获取CSP句柄
		bRet = ::CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT);
		// 创建HASH对象
		bRet = ::CryptCreateHash(hCryptProv, CALG_MD5, NULL, 0, &hCryptHash);
		// 对密钥进行HASH计算
		bRet = ::CryptHashData(hCryptHash, pPassword, dwPasswordLength, 0);
		// 使用HASH来生成密钥
		bRet = ::CryptDeriveKey(hCryptProv, CALG_AES_128, hCryptHash, CRYPT_EXPORTABLE, &hCryptKey);
		// 加密数据
		bRet = ::CryptEncrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength, dwBufferLength);
	} while (FALSE);

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

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

	do
	{
		// 获取CSP句柄
		bRet = ::CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT);
		// 创建HASH对象
		bRet = ::CryptCreateHash(hCryptProv, CALG_MD5, NULL, 0, &hCryptHash);
		// 对密钥进行HASH计算
		bRet = ::CryptHashData(hCryptHash, pPassword, dwPasswordLength, 0);
		// 使用HASH来生成密钥
		bRet = ::CryptDeriveKey(hCryptProv, CALG_AES_128, hCryptHash, CRYPT_EXPORTABLE, &hCryptKey);
		// 解密数据
		bRet = ::CryptDecrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength);
	} while (FALSE);
	// 关闭释放
	if (hCryptKey || hCryptHash || hCryptProv)
	{
		::CryptDestroyKey(hCryptKey);
		::CryptDestroyHash(hCryptHash);
		::CryptReleaseContext(hCryptProv, 0);
	}
	return bRet;
}

int main(int argc, char *argv[])
{
	BYTE pData[MAX_PATH] = { 0 };
	DWORD dwDataLength = 0;
	char *Msg = "hello lyshark !";

	::lstrcpy((char *)pData, Msg);
	dwDataLength = 1   ::lstrlen((char *)pData);

	// AES 加密
	AesEncrypt((BYTE *)"123321", pData, dwDataLength, MAX_PATH);
	printf("AES 加密长度: %d 加密后: %s n", dwDataLength,pData);

	// AES 解密
	AesDecrypt((BYTE *)"123321", pData, dwDataLength, MAX_PATH);
	printf("AES 解密长度: %d 解密后: %s n", dwDataLength, pData);

	system("pause");
	return 0;
}

md5/SHA256/SHA512

代码语言：javascript复制

#include <Windows.h>

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);

		*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);
		// 创建一个HASH对象, 指定HASH算法
		bRet = ::CryptCreateHash(hCryptProv, algHashType, NULL, NULL, &hCryptHash);
		// 计算HASH数据
		bRet = ::CryptHashData(hCryptHash, pData, dwDataLength, 0);
		// 获取HASH结果的大小
		dwTemp = sizeof(dwHashDataLength);
		bRet = ::CryptGetHashParam(hCryptHash, HP_HASHSIZE, (BYTE *)(&dwHashDataLength), &dwTemp, 0);
		// 申请内存
		pHashData = new BYTE[dwHashDataLength];
		::RtlZeroMemory(pHashData, dwHashDataLength);
		// 获取HASH结果数据
		bRet = ::CryptGetHashParam(hCryptHash, HP_HASHVAL, pHashData, &dwHashDataLength, 0);
		// 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 || hCryptProv)
	{
		::CryptDestroyHash(hCryptHash);
		::CryptReleaseContext(hCryptProv, 0);
	}
	return bRet;
}


int main(int argc, char* argv[])
{
	BYTE *pData = NULL;
	DWORD dwDataLength = 0;
	BYTE *pHashData = NULL;
	DWORD dwHashDataLength = 0;
	
	// 读取文件数据
	GetFileData("C:\nc.exe", &pData, &dwDataLength);

	// MD5
	CalculateHash(pData, dwDataLength, CALG_MD5, &pHashData, &dwHashDataLength);

	for (DWORD x = 0; x < dwHashDataLength; x  )
		printf("%x", pHashData[x]);
	printf("n");

	// SHA256
	CalculateHash(pData, dwDataLength, CALG_SHA_256, &pHashData, &dwHashDataLength);
	for (DWORD x = 0; x < dwHashDataLength; x  )
		printf("%x", pHashData[x]);

	delete[]pHashData;
	pHashData = NULL;

	system("pause");
	return 0;
}

RSA

代码语言：javascript复制

// 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);
		// 生成公私密钥对
		bRet = ::CryptGenKey(hCryptProv, AT_KEYEXCHANGE, CRYPT_EXPORTABLE, &hCryptKey);
		// 获取公钥密钥的长度和内容
		bRet = ::CryptExportKey(hCryptKey, NULL, PUBLICKEYBLOB, 0, NULL, &dwPublicKeyLength);

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

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

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

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

	} while (FALSE);

	// 释放关闭
	if (hCryptKey || hCryptProv)
	{
		::CryptDestroyKey(hCryptKey);
		::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);
		// 导入公钥
		bRet = ::CryptImportKey(hCryptProv, pPublicKey, dwPublicKeyLength, NULL, 0, &hCryptKey);
		// 加密数据
		bRet = ::CryptEncrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength, dwBufferLength);
	} while (FALSE);

	// 释放并关闭
	if (hCryptKey || hCryptProv)
	{
		::CryptDestroyKey(hCryptKey);
		::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);
		// 导入私钥
		bRet = ::CryptImportKey(hCryptProv, pPrivateKey, dwProvateKeyLength, NULL, 0, &hCryptKey);
		// 解密数据
		bRet = ::CryptDecrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength);
	} while (FALSE);

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



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

	pData = new BYTE[dwBufferLength];
	if (NULL == pData)
	{
		return 1;
	}
	::RtlZeroMemory(pData, dwBufferLength);
	::lstrcpy((char *)pData, "hello lyshark");
	dwDataLength = 1   ::lstrlen((char *)pData);
	
	// 生成公钥和私钥
	GenerateKey(&pPublicKey, &dwPublicKeyLength, &pPrivateKey, &dwPrivateKeyLength);
	printf("Public Key[%d]n", dwPublicKeyLength);
	for (i = 0; i < dwPublicKeyLength; i  )
		printf("%.2x", pPublicKey[i]);
	printf("n");

	printf("Private Key[%d]n", dwPrivateKeyLength);
	for (i = 0; i < dwPrivateKeyLength; i  )
		printf("%.2x", pPrivateKey[i]);
	printf("nn");


	// 公钥加密
	RsaEncrypt(pPublicKey, dwPublicKeyLength, pData, dwDataLength, dwBufferLength);
	printf("RSA Encrypt[%d]n", dwDataLength);
	for (i = 0; i < dwDataLength; i  )
		printf("%x", pData[i]);
	printf("nn");

	// 私钥解密
	RsaDecrypt(pPrivateKey, dwPrivateKeyLength, pData, dwDataLength);
	printf("RSA Decrypt[%d] %s n", dwDataLength,pData);
	printf("nn");

	// 释放
	if (pData)
	{
		delete[]pData;
		pData = NULL;
	}
	if (pPrivateKey)
	{
		delete[]pPrivateKey;
		pPrivateKey = NULL;
	}
	if (pPublicKey)
	{
		delete[]pPublicKey;
		pPublicKey = NULL;
	}

	system("pause");
	return 0;
}

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