[Botan-devel] Decoding error with TripleDES/CBC -- help please!

[Patrick J S. <swe...@ho...>]

Hi this is my first post so hopefully it works... =20

I'm developing a simple application which encrypts, then decrypts a =
buffer using DES/CBC and TripleDES/CBC.

Using the encryptor Pipe, it appears to be encrypting correctly, though =
at the moment I have no way of knowing because I get the following error =
when the decryptor Pipe is used:

Exception caught: Botan: Decoding error: PKCS7

I get the same error even if I leave the PKCS7 off of the =
"TripleDES/CBC" statement.  Not sure what is going on here, any ideas?  =
I'm operating FreeBSD 4.10 with Botan version 1.2.8.

Thanks for any help.

<-- Begin code -->

#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <memory>

#include <botan/filters.h>
#include <botan/look_pk.h>
#include <botan/lookup.h>
#include <botan/dsa.h>

using namespace Botan;

int main() {
=20
 byte buf[] =3D =
"abcdefghijklmnopqrstuvwxyz123456abcdefghijklmnopqrstuvwxyz123456";

 try {
=20
  LibraryInitializer init;
=20
  /* this is the encryption/decryption key */
  const char * ph =3D =
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";

  byte my_iv[] =3D "aaaaaaaaaaaaaaaa";

  std::string passphrase(ph);
  SymmetricKey key =3D OctetString(passphrase);

  InitializationVector iv(my_iv, 8);
  Pipe encryptor(get_cipher("TripleDES/CBC/PKCS7", iv, key, =
ENCRYPTION));
  Pipe decryptor(get_cipher("TripleDES/CBC/PKCS7", iv, key, =
DECRYPTION));

  std::cout << "Clear: " << buf << "\n";
 =20
  encryptor.start_msg();
  encryptor.write(buf,64);
  encryptor.end_msg();
  encryptor.read(buf,64);
  std::cout << "Encrypted: " << buf << "\n";
 =20
  decryptor.start_msg();
  decryptor.write(buf,64);
  decryptor.end_msg();
  decryptor.read(buf,64);
  std::cout << "Decrypted: " << buf << "\n";
   =20
 }
 catch(std::exception& e) {
  std::cout << "Exception caught: " << e.what() << std::endl;
 }
 return 1;
}

<-- end code -->