I feel like I'm almost there on this, but I still cannot decode the
BTEA string.
Howver I get the error:
test.exe: ./src/../include/crypto/modes.h:136: virtual void
CryptoPP::OFB_ModePolicy::WriteKeystream(byte*, size_t): Assertion
`m_cipher->IsForwardTransformation()' failed.
Aborted
Please could someone give me a prod in the right direction... Thanks
int encryptTest(){
string plaintext = "Now is the time for all good men to come to the
aide...";
string ciphertext;
string decryptedtext;
string keyString = "1234234534564567";
byte key[BTEA::DEFAULT_KEYLENGTH];
byte iv[BTEA::DEFAULT_KEYLENGTH];
memset(key, 0x0, BTEA::DEFAULT_KEYLENGTH);
memset(iv, 0x0, BTEA::DEFAULT_KEYLENGTH);
memcpy(key, keyString.c_str(), BTEA::DEFAULT_KEYLENGTH);
memcpy(iv, keyString.c_str(), BTEA::DEFAULT_KEYLENGTH);
CryptoPP::TEA::Encryption bteaEncryption(key, TEA::DEFAULT_KEYLENGTH);
CryptoPP::OFB_Mode_ExternalCipher::Encryption
cbcEncryption( bteaEncryption, iv );
StringSink* sink = new StringSink(ciphertext);
Base64Encoder* base64_enc = new Base64Encoder(sink);
CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption,
base64_enc );
stfEncryptor.Put( reinterpret_cast<const unsigned
char*>( plaintext.c_str() ), plaintext.length() + 1 );
stfEncryptor.MessageEnd();
cout << ciphertext << "\n";
}
int decryptTest(){
//string created by code above
string ciphertext = "d00fgN/oDqFovMVKFKmh4YMB81uubca7+ITfEDhm/
fZjrTWpQPdsbdxmkrqRvdj39f3vxrlO\rqt0=";
string decryptedtext;
string keyString = "1234234534564567";
byte key[BTEA::DEFAULT_KEYLENGTH];
byte iv[BTEA::DEFAULT_KEYLENGTH];
memset(key, 0x0, BTEA::DEFAULT_KEYLENGTH);
memset(iv, 0x0, BTEA::DEFAULT_KEYLENGTH);
memcpy(key, keyString.c_str(), BTEA::DEFAULT_KEYLENGTH);
memcpy(iv, keyString.c_str(), BTEA::DEFAULT_KEYLENGTH);
CryptoPP::BTEA::Decryption beaDecryption(key, BTEA::DEFAULT_KEYLENGTH);
CryptoPP::OFB_Mode_ExternalCipher::Decryption
cbcDecryption( beaDecryption, iv);
CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new
CryptoPP::StringSink( decryptedtext ) );
//Base64Decoder* base64_dec = new
CryptoPP::Base64Decoder(stfDecryptor);
//StringSource source(ciphertext, true, base64_dec);
string baseDecodedCipher;
StringSink* sink = new StringSink(baseDecodedCipher);
Base64Decoder* base64_dec = new CryptoPP::Base64Decoder(sink);
StringSource source(ciphertext, true, base64_dec);
stfDecryptor.Put( reinterpret_cast<const unsigned
char*>( baseDecodedCipher.c_str() ), baseDecodedCipher.size() );
stfDecryptor.MessageEnd();
cout << decryptedtext << "\n";
}
On 2 Apr 2008, at 15:16, Colin Bell wrote:
> Ok I think I'm getting closer.. but have some questions
>
> 1. Is this correct?
> 2. How do I set my key?
> 3. The notes say there is no BTEA::BLOCKSIZE so what do I use?
>
> Many thanks
>
> Colin
>
> int main(void){
> string ciphertext = "GOBBELDYGOOK GOES HERE FOR TESTING==";
> string decryptedtext;
>
> byte key[] = {1234, 5678, 9999, 9999};
> byte iv[ CryptoPP::TEA::BLOCKSIZE ];
> // memset( key, 0x00, CryptoPP::BTEA::DEFAULT_KEYLENGTH );
> memset( iv, 0x00, CryptoPP::TEA::BLOCKSIZE );
>
> CryptoPP::BTEA::Decryption beaDecryption(key,
> CryptoPP::BTEA::DEFAULT_KEYLENGTH);
> CryptoPP::CBC_Mode_ExternalCipher::Decryption
> cbcDecryption( beaDecryption, iv);
> CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption,
> new CryptoPP::StringSink( decryptedtext ) );
> stfDecryptor.Put( reinterpret_cast<const unsigned
> char*>( ciphertext.c_str() ), ciphertext.size() );
> stfDecryptor.MessageEnd();
>
> cout << decryptedtext << "\n";
> }
>
> On 2 Apr 2008, at 14:23, Colin Bell wrote:
>> Hi all
>>
>> I've been searching all afternoon for some Crypto++ BTEA examples.
>> Besides the Crypto++ site been down, I can't find anything helpful.
>>
>> Would someone mind pointing me in the right direction to doing a
>> BTEA encryption and then a decryption with a key ie:"1234 1111 2222
>> 3333" and a string. An example would really put me out of my misery!
>>
>> Many many thanks
>>
>> Colin
>
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