org.bouncycastle.bcpg.SymmetricKeyEncSessionPacket 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;

/**
 * Basic type for a symmetric encrypted session key packet
 */
public class SymmetricKeyEncSessionPacket 
    extends ContainedPacket
{
    private int       version;
    private int       encAlgorithm;
    private S2K       s2k;
    private byte[]    secKeyData;
    
    public SymmetricKeyEncSessionPacket(
        BCPGInputStream  in)
        throws IOException
    {
        version = in.read();
        if (version != 4)
        {
            throw new UnsupportedPacketVersionException("Unsupported PGP symmetric-key encrypted session key packet version encountered: " + version);
        }
        encAlgorithm = in.read();

        s2k = new S2K(in);

        this.secKeyData = in.readAll();
    }

    public SymmetricKeyEncSessionPacket(
        int       encAlgorithm,
        S2K       s2k,
        byte[]    secKeyData)
    {
        this.version = 4;
        this.encAlgorithm = encAlgorithm;
        this.s2k = s2k;
        this.secKeyData = secKeyData;
    }
    
    /**
     * @return int
     */
    public int getEncAlgorithm()
    {
        return encAlgorithm;
    }

    /**
     * @return S2K
     */
    public S2K getS2K()
    {
        return s2k;
    }

    /**
     * @return byte[]
     */
    public byte[] getSecKeyData()
    {
        return secKeyData;
    }

    /**
     * @return int
     */
    public int getVersion()
    {
        return version;
    }
    
    public void encode(
        BCPGOutputStream    out)
        throws IOException
    {
        ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
        BCPGOutputStream        pOut = new BCPGOutputStream(bOut);

        pOut.write(version);
        pOut.write(encAlgorithm);
        pOut.writeObject(s2k);
        
        if (secKeyData != null && secKeyData.length > 0)
        {
            pOut.write(secKeyData);
        }

        pOut.close();

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