C/C++ Crypto密码库调用方法

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2023-02-15
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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;
}

AES加密解密:

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <Windows.h>
 
//计算hash值
BOOL CalculateHash(BYTE* pData, DWORD dwDataLength, ALG_ID algHashType, BYTE** ppHashData, DWORD* pdwHashDataLength)
{
    BOOL bRet = FALSE;
    HCRYPTPROV hCryptProv = NULL;
    HCRYPTHASH hCryptHash = NULL;
    DWORD dwTemp = 0;
    DWORD dwHashDataLength = 0;
    BYTE* pHashData = NULL;
 
    // 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)
    {
        return FALSE;
    }
 
    // 创建一个HASH对象, 指定HASH算法
    bRet = ::CryptCreateHash(hCryptProv, algHashType, NULL, NULL, &hCryptHash);
    if (FALSE == bRet)
    {
        CryptReleaseContext(hCryptProv, 0);
        return FALSE;
    }
 
    // 计算HASH数据
    bRet = ::CryptHashData(hCryptHash, pData, dwDataLength, 0);
    if (FALSE == bRet)
    {
        CryptDestroyHash(hCryptHash);
        CryptReleaseContext(hCryptProv, 0);
        return FALSE;
    }
 
    // 获取HASH结果的大小
    dwTemp = sizeof(dwHashDataLength);
    bRet = ::CryptGetHashParam(hCryptHash, HP_HASHSIZE, (BYTE*)(&dwHashDataLength), &dwTemp, 0);
    if (FALSE == bRet)
    {
        CryptDestroyHash(hCryptHash);
        CryptReleaseContext(hCryptProv, 0);
        return FALSE;
    }
 
    // 申请内存
    pHashData = new BYTE[dwHashDataLength]{ 0 };
    if (NULL == pHashData)
    {
        CryptDestroyHash(hCryptHash);
        CryptReleaseContext(hCryptProv, 0);
        return FALSE;
    }
 
    // 获取HASH结果数据
    bRet = ::CryptGetHashParam(hCryptHash, HP_HASHVAL, pHashData, &dwHashDataLength, 0);
    if (FALSE == bRet)
    {
        delete[] pHashData;
        pHashData = NULL;
        CryptDestroyHash(hCryptHash);
        CryptReleaseContext(hCryptProv, 0);
        return FALSE;
    }
 
    // 返回数据
    *ppHashData = pHashData;
    *pdwHashDataLength = dwHashDataLength;
 
    // 释放关闭
    CryptDestroyHash(hCryptHash);
    CryptReleaseContext(hCryptProv, 0);
 
    return TRUE;
}
 
// 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 计算出密钥的MD5值
        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)
{
    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[])
{
}
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