[cryptopp-users] Decrypt same encrypted data multiple times results in different data

[Jeffrey Walton]

#include "cryptlib.h"
#include "rabbit.h"
#include <iostream>
#include <cstdint>

int main(int argc, char *argv[])
{
    using namespace CryptoPP;

    const uint8_t rabbitKey[16] = "012345678901234";
    const uint8_t rabbitIV[8] = "0123456";

    RabbitWithIV::Encryption enc;
    RabbitWithIV::Decryption dec;
    enc.SetKeyWithIV(rabbitKey, 16, rabbitIV, 8);
    dec.SetKeyWithIV(rabbitKey, 16, rabbitIV, 8);

    std::array<byte, 3> origin = { 1,2,3 };
    std::array<byte, 3> encrpyt;
    enc.ProcessData(encrpyt.data(), origin.data(), origin.size());

    std::array<byte, 3> decrypt;
    dec.ProcessData(decrypt.data(), encrpyt.data(), encrpyt.size());

    dec.Resynchronize(rabbitIV, sizeof(rabbitIV));
    dec.ProcessData(decrypt.data(), encrpyt.data(), encrpyt.size());

    dec.Resynchronize(rabbitIV, sizeof(rabbitIV));
    dec.ProcessData(decrypt.data(), encrpyt.data(), encrpyt.size());
    
    std::cout << (int)decrypt[0] << " " << (int)decrypt[1] << " " << 
(int)decrypt[2] << std::endl;
    
    return 0;
}

Results in:

$ g++ -DNDEBUG -g2 -O3 -std=c++11 test.cxx -o test.exe ./libcryptopp.a
$ ./test.exe
1 2 3

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