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

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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.bcpg;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.io.Streams;

/**
 * basic packet for a PGP public key
 */
public class PublicKeyEncSessionPacket 
    extends ContainedPacket implements PublicKeyAlgorithmTags
{
    private int            version;
    private long           keyID;
    private int            algorithm;
    private byte[][]       data;

    PublicKeyEncSessionPacket(
        BCPGInputStream    in)
        throws IOException
    {      
        version = in.read();
        if (version != 3)
        {
            throw new UnsupportedPacketVersionException("Unsupported PGP public key encrypted session key packet version encountered: " + version);
        }
        
        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 byte[1][];
            
            data[0] = new MPInteger(in).getEncoded();
            break;
        case ELGAMAL_ENCRYPT:
        case ELGAMAL_GENERAL:
            data = new byte[2][];
            
            data[0] = new MPInteger(in).getEncoded();
            data[1] = new MPInteger(in).getEncoded();
            break;
        case ECDH:
            data = new byte[1][];

            data[0] = Streams.readAll(in);
            break;
        default:
            throw new IOException("unknown PGP public key algorithm encountered");
        }
    }
    
    public PublicKeyEncSessionPacket(
        long           keyID,
        int            algorithm,
        byte[][]       data)
    {
        this.version = 3;
        this.keyID = keyID;
        this.algorithm = algorithm;
        this.data = new byte[data.length][];

        for (int i = 0; i != data.length; i++)
        {
            this.data[i] = Arrays.clone(data[i]);
        }
    }
    
    public int getVersion()
    {
        return version;
    }
    
    public long getKeyID()
    {
        return keyID;
    }
    
    public int getAlgorithm()
    {
        return algorithm;
    }
    
    public byte[][] 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.write(data[i]);
        }

        pOut.close();

        out.writePacket(PUBLIC_KEY_ENC_SESSION , bOut.toByteArray());
    }
}