Hello, i use crypto++ for encrypting/decrypting with Twofish.
The problem i have is, that after encrypting data, then decrypting
that exact data, the padding remains.
This is how i encrypt and decrypt
string input = { some hex bytes };
CryptoPP::CBC_Mode<CryptoPP::Twofish>::Encryption TFEncryptGTC;
//Set IV
TFEncryptGTC.Resynchronize(vector);
//encrypt
string encrypted;
CryptoPP::StringSource(input, true, new
CryptoPP::StreamTransformationFilter(TFEncryptGTC, new
CryptoPP::StringSink(encrypted)));
//After that, i do the reverse with the data i got after encrypting
CryptoPP::CBC_Mode<CryptoPP::Twofish>::Decryption TFDecryptGTC;
//Set IV (same as the one used for encryption ofcourse)
TFDecryptGTC.Resynchronize(vector);
//decrypt
string output;
CryptoPP::StringSource(encrypted, true, new
CryptoPP::StreamTransformationFilter(TFDecryptGTC, new
CryptoPP::StringSink(output)));
the output i get isnt the same as the input i put in ! instead, it's
input + some bytes like 0x00 0xcd 0xcd 0xcd or 0x00 0xfd 0xfd 0xfd...
if i run this output through encryption and decryption again, i will
get another trailing padding ! so it would have 2 times 0x00 0xcd 0xcd
0xcd at the end...
why isnt decryption removing the padding that streamtransformation
added to perform encryption properly ?
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