crypto++编程

拼搏现实的明天。 2022-03-12 07:19 130阅读 0赞

1.AES 举例

#include "stdafx.h"
    #include <iostream>
    using namespace std;
    #include <cryptopp/aes.h>
    using namespace CryptoPP;
    int main()
    {
    //AES 中使用的固定参数是以类 AES 中定义的 enum 数据类型出现的，而不是成员函数或变量
    //因此需要用::符号来索引
    cout << "AES Parameters: " << endl;
    cout << "Algorithm name : " << AES::StaticAlgorithmName() << endl;
    //Crypto++库中一般用字节数来表示长度，而不是常用的字节数
    cout << "Block size : " << AES::BLOCKSIZE * 8 << endl;
    cout << "Min key length : " << AES::MIN_KEYLENGTH * 8 << endl;
    cout << "Max key length : " << AES::MAX_KEYLENGTH * 8 << endl;
    //AES 中只包含一些固定的数据，而加密解密的功能由 AESEncryption 和 AESDecryption 来完成
    //加密过程
    AESEncryption aesEncryptor; //加密器
    unsigned char aesKey[AES::DEFAULT_KEYLENGTH]; //密钥
    unsigned char inBlock[AES::BLOCKSIZE] = "123456789"; //要加密的数据块
    unsigned char outBlock[AES::BLOCKSIZE]; //加密后的密文块
    unsigned char xorBlock[AES::BLOCKSIZE]; //必须设定为全零
    memset( xorBlock, 0, AES::BLOCKSIZE ); //置零
    aesEncryptor.SetKey( aesKey, AES::DEFAULT_KEYLENGTH ); //设定加密密钥
    aesEncryptor.ProcessAndXorBlock( inBlock, xorBlock, outBlock ); //加密
    //以进制显示加密后的数据
    for( int i=0; i<16; i++ )
    {
    cout << hex << (int)outBlock << " ";
    }
    cout << endl;
    //解密
    AESDecryption aesDecryptor;unsigned char plainText[AES::BLOCKSIZE];
    aesDecryptor.SetKey( aesKey, AES::DEFAULT_KEYLENGTH );
    aesDecryptor.ProcessAndXorBlock( outBlock, xorBlock, plainText );
    for( int i=0; i<16; i++ ) { cout << plainText; }
    cout << endl;
    return 0;
    }

2.SHA1 举例  
2.1 一次哈希

#include "stdafx.h"
    #include <iostream>
    using namespace std;
    #include <cryptopp/sha.h>
    #include <stdio.h>
    using namespace CryptoPP;
    int main()
    {
    //byte mess[]="abc";
    byte mess[]="abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
    byte const* pbData = (byte const*)mess;
    unsigned int nDataLen = 57;
    byte abDigest[SHA::DIGESTSIZE];
    SHA().CalculateDigest(abDigest, pbData, nDataLen);
    // abDigest now contains the hash of pbData
    if (!SHA().VerifyDigest(abDigest, pbData, nDataLen))
    throw "abDigest does not contain the right hash";
    for(int i=0;i<SHA::DIGESTSIZE;i++)
    printf("%X ",abDigest[i]);
    cout<<endl;
    return 0;
    }

2.2 多次哈希

#include "stdafx.h"
    #include <iostream>
    using namespace std;
    #include <cryptopp/sha.h>
    #include <stdio.h>
    using namespace CryptoPP;
    int main()
    {
    byte mess1[]="abc";
    byte mess2[]="abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
    // byte const* pbData = (byte const*)mess;
    byte const* pbData1 =(byte const*)mess1;
    byte const* pbData2 = (byte const*)mess2;
    unsigned int nData1Len =3;
    unsigned int nData2Len = 57;
    byte abDigest[SHA::DIGESTSIZE];
    SHA hash;
    hash.Update(pbData1, nData1Len);
    hash.Update(pbData2, nData2Len);
    hash.Final(abDigest);
    for(int i=0;i<SHA::DIGESTSIZE;i++)
    printf("%X ",abDigest[i]);
    cout<<endl;
    // abDigest now contains the hash of pbData1 and pbData2;
    // the object 'hash' can now be reused to calculate another digest
    //SHA hash;
    hash.Restart();
    hash.Update(pbData1, nData1Len);
    hash.Update(pbData2, nData2Len);
    if (!hash.Verify(abDigest))
    throw "abDigest does not contain the right hash";
    for(int i=0;i<SHA::DIGESTSIZE;i++)
    printf("%X ",abDigest[i]);
    cout<<endl;
    return 0;
    }

3 SHA256 举例  
只需把 sha1 中的 SHA 替换为 SHA256 即可