Hello guys. I have some code of cryptoPP using AES algorithm. And it's work
with some small .txt file but when i decrypt some big file (suck as .doc
file) it doesn't work. But i don't understand how does it work. Please
comment in each line in my project. Sorry because my English is not good.
Thank you! And here is my code:
void encryptFile(const char* password, const char* inputFileName,
const char* outputFileName)
{
byte pass[AES::BLOCKSIZE];
byte iv[16];
AutoSeededRandomPool rng;
StringSource(password, true,
new HashFilter(*(new SHA256), new ArraySink(pass,
AES::BLOCKSIZE)));
rng.GenerateBlock(iv, 16);
AES::Encryption aesEncryption(pass, CryptoPP::AES::DEFAULT_KEYLENGTH);
CBC_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption, iv);
StreamTransformationFilter *encryptor;
encryptor = new StreamTransformationFilter(cbcEncryption,
new FileSink(outputFileName)
);
encryptor->Put(iv, 16);
FileSource(inputFileName, true, encryptor);
}
void decryptFile(const char* password, const char*inputFileName,
const char* outputFileName)
{
byte pass[AES::BLOCKSIZE];
byte iv[16];
try {
StringSource(password, true, new HashFilter(*(new SHA256), new
ArraySink(pass,AES::BLOCKSIZE)));
CryptoPP::AES::Decryption aesDecryption(pass,
CryptoPP::AES::DEFAULT_KEYLENGTH);
CryptoPP::CBC_Mode_ExternalCipher::Decryption
cbcDecryption(aesDecryption, iv);
StreamTransformationFilter *decryptor;
decryptor = new
StreamTransformationFilter(cbcDecryption, new
FileSink(outputFileName));
char garbage[16], iv_garbage[16];
ifstream inf;
inf.open(inputFileName); inf.read(iv_garbage, 16);
cbcDecryption.ProcessData((byte *)garbage, (const byte *)iv_garbage,
16);
FileSource(inf, true, decryptor);
inf.close();
}
catch(CryptoPP::Exception &e)
{
cerr << "Caught exception during decryption!" << endl;
return;
}
}
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