Java Security

I am working on a project wherein I am using the OpenPGP java API for encrypting and decrypting data.


I am using
OpenPGP java API - cryptix-openpgp-20050418-snap
Java version - JDK 1.5.0
Data is encrypted using - MEGACRYPTION/MVS V5.4 (A encryption software used by mainframe application and supports PGP)




I am able to decrypt the file using the PGP Desktop tool, however, when I try to decrypt a file from a particular agency, I get the following error

cryptix.message.MessageException: cryptix.openpgp.PGPDataFormatException: Unknown version for public key encrypted session key packet.
at cryptix.openpgp.provider.PGPMessageFactory.generateBinary(PGPMessageFactory.java:207)
at cryptix.openpgp.provider.PGPMessageFactory.engineGenerateMessages(PGPMessageFactory.java:76)
at cryptix.message.MessageFactory.generateMessages(MessageFactory.java:142)
at com.bis.crypto.AsymmetricDecryptor.decrypt(AsymmetricDecryptor.java:93)
at com.bis.crypto.AsymmetricDecryptor.main(AsymmetricDecryptor.java:314)


I am getting this error at the following point in the PGP code:

Class - cryptix.openpgp.packet.PGPPublicKeyEncryptedSessionKeyPacket


Method call -

  public void decodeBody (PGPPacketDataInputStream in,
                            PGPAlgorithmFactory factory)
        throws IOException, PGPFatalDataFormatException, PGPDataFormatException
    {

 

        version = in.readByte();

        if ((version != 3) && (version != 2)) {

            in.readByteArray(); // read all remaining bytes

            throw new PGPDataFormatException("Unknown version for "+

                "public key encrypted session key packet.");

        }

 

        keyid = new byte[8];

        in.readFully(keyid);

 

        pubalgid = in.readUnsignedByte();

I modified the PGP code to allow version 113 which the version that comes up when the data is being decrypted, but this gives me another error � �cryptix.message.MessageException: cryptix.openpgp.PGPDataFormatException: Zero length packet.�

Thanks for your help in advance

Joseph