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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 LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.bcpg.sig;

import org.bouncycastle.bcpg.SignatureSubpacket;

/**
 * Signature Subpacket containing algorithm preferences of the key holder's implementation.
 * This class is used to implement:
 * 
 *     Preferred Hash Algorithms
 *     Preferred Symmetric Key Algorithms
 *     Preferred Compression Algorithms
 * 
 *
 * @see 
 *     RFC9580 - Preferred Symmetric Ciphers for v1 SEIPD
 * @see 
 *     RFC9580 - Preferred Hash Algorithms
 * @see 
 *     RFC9580 - Preferred Compression Algorithms
 * @see 
 *     RFC4880 - Preferred Symmetric Algorithms
 * @see 
 *     RFC4880 - Preferred Hash Algorithms
 * @see 
 *     RFC4880 - Preferred Compression Algorithms
 */
public class PreferredAlgorithms 
    extends SignatureSubpacket
{    
    protected static byte[] intToByteArray(
        int[]    v)
    {
        byte[]    data = new byte[v.length];
        
        for (int i = 0; i != v.length; i++)
        {
            data[i] = (byte)v[i];
        }
        
        return data;
    }
    
    public PreferredAlgorithms(
        int        type,
        boolean    critical,
        boolean    isLongLength,
        byte[]     data)
    {
        super(type, critical, isLongLength, data);
    }
    
    public PreferredAlgorithms(
        int        type,
        boolean    critical,
        int[]      preferences)
    {
        super(type, critical, false, intToByteArray(preferences));
    }

    public int[] getPreferences()
    {
        int[]    v = new int[data.length];
        
        for (int i = 0; i != v.length; i++)
        {
            v[i] = data[i] & 0xff;
        }
        
        return v;
    }
}