Crypto++使用AES/CBC模式加解密二进制数据

以下代码演示了如何使用Crypto++（AES/CBC模式）加密、解密二进制数据：

//
// Created by gj on 12/23/19.
//

#include <iostream>
#include <crypto++/aes.h>
#include <crypto++/modes.h>
#include <crypto++/sha.h>
#include <crypto++/filters.h>
#include <crypto++/files.h>

namespace CryptoPP {
    using byte = unsigned char;
}

using namespace std;
using namespace CryptoPP;

int main(int argc, char *argv[]) {
    byte key[AES::DEFAULT_KEYLENGTH] = {
            '0', '1', '2', '3', '4', '5', '6', '7',
            '0', '1', '2', '3', '4', '5', '6', '7',
    };
    byte iv[AES::BLOCKSIZE] = {
            0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF,
            0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF
    };

    std::string password = "testPassWord";

    // encrypt
    // ---------------------------------
    int chunkSize = 20 * CryptoPP::AES::BLOCKSIZE;

    CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption encryptor;
    encryptor.SetKeyWithIV(key, sizeof(key), iv);

    std::ofstream testOut("./test.enc", std::ios::binary);
    CryptoPP::FileSink outSink(testOut);

    CryptoPP::byte message[chunkSize];

    CryptoPP::StreamTransformationFilter stfenc(encryptor, new CryptoPP::Redirector(outSink),
                                                BlockPaddingSchemeDef::NO_PADDING);

    for (int i = 0; i < chunkSize; i++) {
        message[i] = (CryptoPP::byte) i;
        std::cout << (int) (char) message[i] << ',';
    }
    cout << endl;

    stfenc.Put(message, chunkSize);
    stfenc.MessageEnd();
    testOut.close();

    // decrypt
    // ------------------------------------
    // Because of some unknown reason increase chuksize by 1 block
    // chunkSize+=16;

    CryptoPP::byte cipher[chunkSize], decrypted[chunkSize];

    CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption decryptor;
    decryptor.SetKeyWithIV(key, sizeof(key), iv);

    std::ifstream inFile("./test.enc", std::ios::binary);
    inFile.read((char *) cipher, chunkSize);

    for (int i = 0; i < chunkSize; i++) {
        char c = cipher[i];
        std::cout << (int) c << ',';
    }
    cout << endl;

    CryptoPP::ArraySink decSink(decrypted, chunkSize);
    CryptoPP::StreamTransformationFilter stfdec(decryptor, new CryptoPP::Redirector(decSink),
                                                BlockPaddingSchemeDef::NO_PADDING);

    stfdec.Put(cipher, chunkSize);
    stfdec.MessageEnd();
    inFile.close();

    for (int i = 0; i < chunkSize; i++) {
        std::cout << (int) (char) decrypted[i] << ',';
    }
    std::cout << std::endl;

    return 0;
}