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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 java.util.Date;

/**
 * basic packet for a PGP public key
 */
public class PublicKeyPacket 
    extends ContainedPacket implements PublicKeyAlgorithmTags
{
    private int            version;
    private long           time;
    private int            validDays;
    private int            algorithm;
    private BCPGKey        key;
    
    PublicKeyPacket(
        BCPGInputStream    in)
        throws IOException
    {      
        version = in.read();
        time = ((long)in.read() << 24) | (in.read() << 16) | (in.read() << 8) | in.read();
 
        if (version <= 3)
        {
            validDays = (in.read() << 8) | in.read();
        }
        
        algorithm = (byte)in.read();

        switch (algorithm)
        {
        case RSA_ENCRYPT:
        case RSA_GENERAL:
        case RSA_SIGN:
            key = new RSAPublicBCPGKey(in);
            break;
        case DSA:
            key = new DSAPublicBCPGKey(in);
            break;
        case ELGAMAL_ENCRYPT:
        case ELGAMAL_GENERAL:
            key = new ElGamalPublicBCPGKey(in);
            break;
        case ECDH:
            key = new ECDHPublicBCPGKey(in);
            break;
        case ECDSA:
            key = new ECDSAPublicBCPGKey(in);
            break;
        case EDDSA:
            key = new EdDSAPublicBCPGKey(in);
            break;
        default:
            throw new IOException("unknown PGP public key algorithm encountered: " + algorithm);
        }
    }
    
    /**
     * Construct version 4 public key packet.
     * 
     * @param algorithm
     * @param time
     * @param key
     */
    public PublicKeyPacket(
        int        algorithm,
        Date       time,
        BCPGKey    key)
    {
        this.version = 4;
        this.time = time.getTime() / 1000;
        this.algorithm = algorithm;
        this.key = key;
    }
    
    public int getVersion()
    {
        return version;
    }
    
    public int getAlgorithm()
    {
        return algorithm;
    }
    
    public int getValidDays()
    {
        return validDays;
    }
    
    public Date getTime()
    {
        return new Date(time * 1000);
    }
    
    public BCPGKey getKey()
    {
        return key;
    }
    
    public byte[] getEncodedContents() 
        throws IOException
    {
        ByteArrayOutputStream    bOut = new ByteArrayOutputStream();
        BCPGOutputStream         pOut = new BCPGOutputStream(bOut);
    
        pOut.write(version);
    
        pOut.write((byte)(time >> 24));
        pOut.write((byte)(time >> 16));
        pOut.write((byte)(time >> 8));
        pOut.write((byte)time);
    
        if (version <= 3)
        {
            pOut.write((byte)(validDays >> 8));
            pOut.write((byte)validDays);
        }
    
        pOut.write(algorithm);
    
        pOut.writeObject((BCPGObject)key);

        pOut.close();

        return bOut.toByteArray();
    }
    
    public void encode(
        BCPGOutputStream    out)
        throws IOException
    {
        out.writePacket(PUBLIC_KEY, getEncodedContents());
    }
}