Thank you! Can you fix it for me?
Vào 19:44:09 UTC+7 Thứ hai, ngày 24 tháng hai năm 2014, Việt Hồ đã viết:
>
> 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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