Hi all,
i am new to crypto++. I am currently trying to encrypt then decrypt
portion of a file. However, I have encounter some problems and require
some help.
code:
CIPHER Algo = AES
CIPHER_MODE = CTR
// encryption
while(counter < TOTALBLOCK)
{
infile.read(plainText,INSIZE);
CryptoPP::CIPHER_MODE<CryptoPP::CIPHER>::Encryption Encryptor(key,
sizeof(key), iv);
CryptoPP::StringSource(plainText, true, new
CryptoPP::StreamTransformationFilter(Encryptor, new
CryptoPP::StringSink(CipherText)));
std::strcpy(tempText1, CipherText.c_str());
std::cout << counter+1 << " encrypted : " << CipherText << " | " <<
CipherText.length() << std::endl;
outfile.write(tempText1,OUTSIZE);
counter++;
//clear temp variable content
}
//decryption
counter = 0;
while(counter < TOTALBLOCK)
{
in.read(tempText1,OUTSIZE);
CipherText = tempText1;
CryptoPP::CIPHER_MODE<CryptoPP::CIPHER>::Decryption Decryptor(key,
sizeof(key), iv);
CryptoPP::StringSource(CipherText, true, new
CryptoPP::StreamTransformationFilter(Decryptor, new
CryptoPP::StringSink(RecoverText)));
std::cout << counter+1 << " decrypted : " << RecoverText << " | " <<
RecoverText.length() << std::endl;
std::strcpy(tempText, RecoverText.c_str());
out.write(tempText,INSIZE);
counter++;
//clear temp variable content
}
scenario 1:
file content -
1234567980ABCDEFGHIJ (x5 without any newline) (20 bytes per set)
output is fine
scenario 2:
file content -
1234567980ABCDEFGHIJ
1234567980ABCDEFGHIJ
1234567980ABCDEFGHIJ
1234567980ABCDEFGHIJ
1234567980ABCDEFGHIJ
output
1234567890ABCDEFGHIJ
1234567890ABCDEFGHIJ
1234567890ABCDEFGHIJ
1234567890ABCDEFGHIJ
123 FG7890ABCDEFGHIJxÔ´ F
can anyone tell me what's wrong?
If I encrypt and decrypt scenario file by feeding in the whole file
i.e. using filesource, filesink, it works fine.
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