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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.*;

/**
 * generic signature object
 */
public class OnePassSignaturePacket 
    extends ContainedPacket
{
    private int  version;
    private int  sigType;
    private int  hashAlgorithm;
    private int  keyAlgorithm;
    private long keyID;
    private int  nested;
    
    OnePassSignaturePacket(
        BCPGInputStream    in)
        throws IOException
    {
        version = in.read();
        sigType = in.read();
        hashAlgorithm = in.read();
        keyAlgorithm = 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();
        
        nested = in.read();
    }
    
    public OnePassSignaturePacket(
        int        sigType,
        int        hashAlgorithm,
        int        keyAlgorithm,
        long       keyID,
        boolean    isNested)
    {
        this.version = 3;
        this.sigType = sigType;
        this.hashAlgorithm = hashAlgorithm;
        this.keyAlgorithm = keyAlgorithm;
        this.keyID = keyID;
        this.nested = (isNested) ? 0 : 1;
    }
    
    /**
     * Return the signature type.
     * @return the signature type
     */
    public int getSignatureType()
    {
        return sigType;
    }
    
    /**
     * return the encryption algorithm tag
     */
    public int getKeyAlgorithm()
    {
        return keyAlgorithm;
    }
    
    /**
     * return the hashAlgorithm tag
     */
    public int getHashAlgorithm()
    {
        return hashAlgorithm;
    }
    
    /**
     * @return long
     */
    public long getKeyID()
    {
        return keyID;
    }
    
    /**
     * 
     */
    public void encode(
        BCPGOutputStream    out)
        throws IOException
    {
        ByteArrayOutputStream    bOut = new ByteArrayOutputStream();
        BCPGOutputStream            pOut = new BCPGOutputStream(bOut);
  
        pOut.write(version);
        pOut.write(sigType);
        pOut.write(hashAlgorithm);
        pOut.write(keyAlgorithm);

        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(nested);

        pOut.close();

        out.writePacket(ONE_PASS_SIGNATURE, bOut.toByteArray(), true);
    }
}