org.bouncycastle.bcpg.PublicKeyEncSessionPacket Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of bcpg-jdk15on Show documentation

The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5 to JDK 1.7. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

There is a newer version: 1.70

Show newest version

package org.bouncycastle.bcpg;

import java.io.*;
import java.math.BigInteger;

/**
 * basic packet for a PGP public key
 */
public class PublicKeyEncSessionPacket 
    extends ContainedPacket implements PublicKeyAlgorithmTags
{
    private int            version;
    private long           keyID;
    private int            algorithm;
    private BigInteger[]   data;
    
    PublicKeyEncSessionPacket(
        BCPGInputStream    in)
        throws IOException
    {      
        version = in.read();
        
        keyID |= (long)in.read() << 56;
        keyID |= (long)in.read() << 48;
        keyID |= (long)in.read() << 40;
        keyID |= (long)in.read() << 32;
        keyID |= (long)in.read() << 24;
        keyID |= (long)in.read() << 16;
        keyID |= (long)in.read() << 8;
        keyID |= in.read();
        
        algorithm = in.read();
        
        switch (algorithm)
        {
        case RSA_ENCRYPT:
        case RSA_GENERAL:
            data = new BigInteger[1];
            
            data[0] = new MPInteger(in).getValue();
            break;
        case ELGAMAL_ENCRYPT:
        case ELGAMAL_GENERAL:
            data = new BigInteger[2];
            
            data[0] = new MPInteger(in).getValue();
            data[1] = new MPInteger(in).getValue();
            break;
        default:
            throw new IOException("unknown PGP public key algorithm encountered");
        }
    }
    
    public PublicKeyEncSessionPacket(
        long           keyID,
        int            algorithm,
        BigInteger[]   data)
    {
        this.version = 3;
        this.keyID = keyID;
        this.algorithm = algorithm;
        this.data = data;
    }
    
    public int getVersion()
    {
        return version;
    }
    
    public long getKeyID()
    {
        return keyID;
    }
    
    public int getAlgorithm()
    {
        return algorithm;
    }
    
    public BigInteger[] getEncSessionKey()
    {
        return data;
    }
    
    public void encode(
        BCPGOutputStream    out)
        throws IOException
    {
        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();
        BCPGOutputStream       pOut = new BCPGOutputStream(bOut);
  
          pOut.write(version);
          
        pOut.write((byte)(keyID >> 56));
        pOut.write((byte)(keyID >> 48));
        pOut.write((byte)(keyID >> 40));
        pOut.write((byte)(keyID >> 32));
        pOut.write((byte)(keyID >> 24));
        pOut.write((byte)(keyID >> 16));
        pOut.write((byte)(keyID >> 8));
        pOut.write((byte)(keyID));
        
        pOut.write(algorithm);
        
        for (int i = 0; i != data.length; i++)
        {
            pOut.writeObject(new MPInteger(data[i]));
        }
        
        out.writePacket(PUBLIC_KEY_ENC_SESSION , bOut.toByteArray(), true);
    }
}