以Crypto++实现RSA加解密二进制数据

网上一大片讲怎么加解密字符串的，找了大半天也没找到讲加解密二进制数据的，于是自己研究了下，分享给大家。

加解密函数：

#include <rsa.h>
#include <randpool.h>
#include <filters.h>

void GenerateRSAKey(byte seed[], size_t seedLen, size_t keyLen,
	byte privateKey[], size_t &privateKeyLen,
	byte publicKey[], size_t &publicKeyLen)
{
	CryptoPP::RandomPool randomPool;
	randomPool.Put(seed, seedLen);

	CryptoPP::RSAES_OAEP_SHA_Decryptor decryptor(randomPool, 1024);
	CryptoPP::ArraySink decArr(privateKey, privateKeyLen);
	decryptor.DEREncode(decArr);
	decArr.MessageEnd();
	privateKeyLen = decArr.TotalPutLength();

	CryptoPP::RSAES_OAEP_SHA_Encryptor encryptor(decryptor);
	CryptoPP::ArraySink encArr(publicKey, publicKeyLen);
	encryptor.DEREncode(encArr);
	encArr.MessageEnd();
	publicKeyLen = encArr.TotalPutLength();
}

void RSAEncryptData(byte seed[], size_t seedLen, byte publicKey[], size_t publicKeyLen,
	byte plainData[], size_t plainDataLen, byte cipherData[], size_t &cipherDataLen)
{
	CryptoPP::ArraySource keyArr(publicKey, publicKeyLen, true);
	CryptoPP::RSAES_OAEP_SHA_Encryptor enc;
	enc.AccessKey().Load(keyArr);

	CryptoPP::RandomPool randomPool;
	randomPool.Put(seed, seedLen);

	size_t putLen = 0;
	size_t fixedLen = enc.FixedMaxPlaintextLength();
	for (size_t i = 0; i < plainDataLen; i += fixedLen)
	{
		size_t len = fixedLen < (plainDataLen - i) ? fixedLen : (plainDataLen - i);
		CryptoPP::ArraySink *dstArr = new CryptoPP::ArraySink(cipherData + putLen, cipherDataLen - putLen);
		CryptoPP::ArraySource source(plainData + i, len, true, new CryptoPP::PK_EncryptorFilter(randomPool, enc, dstArr));
		putLen += dstArr->TotalPutLength();
	}
	cipherDataLen = putLen;
}

void RSADecryptData(byte seed[], size_t seedLen, byte privateKey[], size_t privateKeyLen,
	byte cipherData[], size_t cipherDataLen, byte plainData[], size_t &plainDataLen)
{
	CryptoPP::ArraySource keyArr(privateKey, privateKeyLen, true);
	CryptoPP::RSAES_OAEP_SHA_Decryptor dec;
	dec.AccessKey().Load(keyArr);

	CryptoPP::RandomPool randomPool;
	randomPool.Put(seed, seedLen);

	size_t putLen = 0;
	size_t fixedLen = dec.FixedCiphertextLength();
	for (size_t i = 0; i < cipherDataLen; i += fixedLen)
	{
		size_t len = fixedLen < (cipherDataLen - i) ? fixedLen : (cipherDataLen - i);
		CryptoPP::ArraySink *dstArr = new CryptoPP::ArraySink(plainData + putLen, plainDataLen - putLen);
		CryptoPP::ArraySource source(cipherData + i, len, true, new CryptoPP::PK_DecryptorFilter(randomPool, dec, dstArr));
		putLen += dstArr->TotalPutLength();
	}
	plainDataLen = putLen;
}

测试函数：

#include <iostream>
#include <string>
#include "CryptRsa.h"

using namespace std;
using namespace CryptoPP;

int main(int argc, char *argv)
{
	try
	{
		string plaintext = "{0FA152B4-D176-4D95-8363-BA9DFC787651}";
		cout << plaintext << endl;
		cout << plaintext.length() << endl;
		byte seed[] = { 0xCA, 0xDA, 0x63, 0xEC, 0x9B, 0x89, 0x40, 0xDE, 0x8E, 0x64, 0x94, 0xE8, 0x79, 0xEA, 0x32, 0x9E };
		size_t privateKeyLen = 2048;
		byte *privateKey = new byte[privateKeyLen];
		size_t publicKeyLen = 2048;
		byte *publicKey = new byte[publicKeyLen];
		GenerateRSAKey(seed, sizeof(seed), 1024, privateKey, privateKeyLen, publicKey, publicKeyLen);
		size_t cipherDataLen = 2048;
		byte *cipherData = new byte[cipherDataLen];
		RSAEncryptData(seed, sizeof(seed), publicKey, publicKeyLen,
			(byte*)plaintext.c_str(), plaintext.length(), cipherData, cipherDataLen);
		size_t plainDataLen = plaintext.length() * 2;
		byte *plainData = new byte[plainDataLen];
		RSADecryptData(seed, sizeof(seed), privateKey, privateKeyLen,
			cipherData, cipherDataLen, plainData, plainDataLen);
		plainData[plainDataLen] = ‘\0‘;
		cout << (char*)plainData << endl;
		cout << plainDataLen << endl;

		delete[] plainData;
		delete[] cipherData;
		delete[] publicKey;
		delete[] privateKey;
	}
	catch (std::exception &e)
	{
		cout << e.what() << endl;
	}
	cin.get();

	return 0;
}