rsa.txt

rsa算法 CRYPTO 函数库 实现,注意编译时候把工程属性修改成使用MFC静态连接

#include "randpool.h"

#include"sha.h"

#include "rsa.h"

#include "hex.h"

#include "files.h"

#include <iostream>


using namespace std;

using namespace CryptoPP;


#pragma comment(lib, "cryptlib.lib")


//------------------------

// 函数声明

//------------------------

void GenerateRSAKey(unsigned int keyLength, const char *privFilename, const char *pubFilename, const char *seed);

string RSAEncryptString(const char *pubFilename, const char *seed, const char *message);

string RSADecryptString(const char *privFilename, const char *ciphertext);

RandomPool & GlobalRNG();


//------------------------

// 主程序

//------------------------

void main()

{

    char priKey[128] = {0};

    char pubKey[128] = {0};

    char seed[1024] = {0};


    // 生成 RSA 密钥对

    strcpy(priKey, "pri"); // 生成的私钥文件

    strcpy(pubKey, "pub"); // 生成的公钥文件

    strcpy(seed, "seed");

    GenerateRSAKey(1024, priKey, pubKey, seed);


    // RSA 加解密

    char message[1024] = {0};

    cout<<"Origin Text:\t"<<"Hello World!"<<endl<<endl;

    strcpy(message, "Hello World!");

    string encryptedText = RSAEncryptString(pubKey, seed, message); // RSA 加密

    cout<<"Encrypted Text:\t"<<encryptedText<<endl<<endl;

    string decryptedText = RSADecryptString(priKey, encryptedText.c_str()); // RSA 解密

    cout<<"Decrypted Text:\t"<<decryptedText<<endl<<endl;

}


//------------------------

// 生成RSA密钥对

//------------------------

void GenerateRSAKey(unsigned int keyLength, const char *privFilename, const char *pubFilename, const char *seed)

{

       RandomPool randPool;

       randPool.Put((byte *)seed, strlen(seed));


       RSAES_OAEP_SHA_Decryptor priv(randPool, keyLength);

       HexEncoder privFile(new FileSink(privFilename));

       priv.DEREncode(privFile);

       privFile.MessageEnd();


       RSAES_OAEP_SHA_Encryptor pub(priv);

       HexEncoder pubFile(new FileSink(pubFilename));

       pub.DEREncode(pubFile);

       pubFile.MessageEnd();

}


//------------------------

// RSA加密

//------------------------

string RSAEncryptString(const char *pubFilename, const char *seed, const char *message)

{

       FileSource pubFile(pubFilename, true, new HexDecoder);

       RSAES_OAEP_SHA_Encryptor pub(pubFile);


       RandomPool randPool;

       randPool.Put((byte *)seed, strlen(seed));


       string result;

       StringSource(message, true, new PK_EncryptorFilter(randPool, pub, new HexEncoder(new StringSink(result))));

       return result;

}


//------------------------

// RSA解密

//------------------------

string RSADecryptString(const char *privFilename, const char *ciphertext)

{

       FileSource privFile(privFilename, true, new HexDecoder);

       RSAES_OAEP_SHA_Decryptor priv(privFile);


       string result;

       StringSource(ciphertext, true, new HexDecoder(new PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(result))));

       return result;

}


//------------------------

// 定义全局的随机数池

//------------------------

RandomPool & GlobalRNG()

{

       static RandomPool randomPool;

       return randomPool;

}//Configuration Properties”→“C/C++” →“Code Generation”，右边的“Runtime Library”设置为“Multi-threaded Debug (/MTd)”（Release模式下对应着“Multi-threaded (/MT)”）