Hi Stef,
> stfEncryptor.Put(reinterpret_cast<const unsigned
> char*>(plaintext.c_str()), plaintext.length() + 1);
Do the scripts include the trailing '\0' of 'Hello'?
Jeff
On 2/5/08, StefSchultz <[EMAIL PROTECTED]> wrote:
>
> Testing the CFB Mode I've noticed that it gives me some strange
> results. I tested the same mode with the same IV and Key in a PHP and
> Python script:
>
> //----------------------------------
> //init key & iv
> $key = "xxxxxxxxxxxxxxxxxxxxxxxx";
> $iv = "xxxxxxxxxxxxxxxx";
>
> //print key
> echo ('key: ' . $key . "\n");
> echo ('iv: ' . $iv . "\n");
>
> //print iv
> echo ('----------------------------------------' . "\n");
>
> //original
> $original = 'hello';
> echo ('original: ' . $original . "\n");
>
> //encode
> $encoded = mcrypt_cfb(MCRYPT_RIJNDAEL_128, $key, $original,
> MCRYPT_ENCRYPT, $iv);
> echo ('encoded (hex): ' . str2hex($encoded) . "\n");
>
> //decode
> $decoded = mcrypt_cfb(MCRYPT_RIJNDAEL_128, $key, $encoded,
> MCRYPT_DECRYPT, $iv);
> echo ('decoded: ' . $decoded . "\n");
> //----------------------------------
>
>
> Both scripts returned the same ciphertext. However, after testing
> Crypto++ I got a different result. Only the first hex number was
> right. This ist the code:
>
>
> //----------------------------------
> const unsigned int keyLength = 24;
> byte key[24], iv[keyLength];
> memset(key, 0x78, keyLength);
> memset(iv, 0x78, AES::BLOCKSIZE);
>
> string plaintext = "hello";
> string ciphertext;
> string decryptedtext;
>
> cout << "Plain Text (" << plaintext.size() << " bytes)" <<
> endl
> << plaintext << endl << endl;
>
> AES::Encryption aesEncryption(key, 24);
> CFB_Mode_ExternalCipher::Encryption
> cfbEncryption(aesEncryption, iv);
> StreamTransformationFilter stfEncryptor(cfbEncryption, new
> StringSink(ciphertext),
>
> StreamTransformationFilter::NO_PADDING);
>
> stfEncryptor.Put(reinterpret_cast<const unsigned
> char*>(plaintext.c_str()), plaintext.length() + 1);
> stfEncryptor.MessageEnd();
>
> cout << "Cipher Text (" << ciphertext.size() << " bytes)\n";
>
> for(size_t i = 0; i < ciphertext.size(); i++)
> cout << "0x" << hex << (0xFF &
> static_cast<byte>(ciphertext[i])) << " ";
> //----------------------------------
>
> Probably I did something wrong. Can somebody offer any help? :-)
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