Hi,
I want to encrypt and decrypt file contains using AES::CBC mode. I tried
the following for encryption and decryption.
It works fine but I get the below two exceptions.
1. Run-Time Check Failure #2 - Stack around the variable 'iVector' was
corrupted.
2. Run-Time Check Failure #2 - Stack around the variable 'key' was
corrupted.
I don't know exactly where I am doing wrong. Please help me to fix this
problem.
To encrypt the file here is my code :-
==================================
void Encrypt(string inFileName, string outFileName)
{
byte key[CryptoPP::AES::DEFAULT_KEYLENGTH];
key[sizeof(key)] = 0;
byte iVector[CryptoPP::AES::BLOCKSIZE];
iVector[sizeof(iVector)] = 0;
ifstream in(inFileName.c_str(), ios::binary);
const string orgStrObj((istreambuf_iterator<char>(in)),
istreambuf_iterator<char>());
in.close();
CryptoPP::AES::Encryption cipher(key, sizeof(key));
CryptoPP::CBC_Mode_ExternalCipher::Encryption encryption(cipher,
iVector);
CryptoPP::StreamTransformationFilter strFilter(encryption, new
CryptoPP::StringSink(encryptStr));
strFilter.Put(reinterpret_cast<const byte*>(orgStrObj.c_str()),
orgStrObj.size());
strFilter.MessageEnd();
ofstream out(outFileName.c_str(), ios::binary);
out.write(encryptStr.c_str(), encryptStr.size());
out.close();
}
To decrypt the file here is my code :-
================================
void Crypto::Decrypt(string inFileName, string outFileName)
{
byte key[CryptoPP::AES::DEFAULT_KEYLENGTH];
key[sizeof(key)] = 0;
byte iVector[CryptoPP::AES::BLOCKSIZE];
iVector[sizeof(iVector)] = 0;
ifstream in(inFileName.c_str(), ios::binary);
const string encryptStrObj((istreambuf_iterator<char>(in)),
istreambuf_iterator<char>());
in.close();
CryptoPP::AES::Decryption cipher(key, sizeof(key));
CryptoPP::CBC_Mode_ExternalCipher::Decryption decryption(cipher,
iVector);
CryptoPP::StreamTransformationFilter strFilter(decryption, new
CryptoPP::StringSink(decryptStr));
strFilter.Put(reinterpret_cast<const byte*>(encryptStrObj.c_str()),
encryptStrObj.size());
strFilter.MessageEnd();
ofstream out(outFileName.c_str(), ios::binary);
out.write(decryptStr.c_str(), decryptStr.size());
out.close();
}
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