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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;
import org.bouncycastle.bcpg.SignatureSubpacketTags;
import org.bouncycastle.util.Arrays;

/**
 * Signature Subpacket containing the hash value of another signature to which this signature applies to.
 *
 * @see 
 *     RFC4880 - Signature Target
 * @see 
 *     RFC9580 - Signature Target
 */
public class SignatureTarget
    extends SignatureSubpacket
{
    public SignatureTarget(
        boolean    critical,
        boolean    isLongLength,
        byte[]     data)
    {
        super(SignatureSubpacketTags.SIGNATURE_TARGET, critical, isLongLength, data);
    }

    public SignatureTarget(
        boolean    critical,
        int        publicKeyAlgorithm,
        int        hashAlgorithm,
        byte[]     hashData)
    {
        super(SignatureSubpacketTags.SIGNATURE_TARGET, critical, false, Arrays.concatenate(new byte[] { (byte)publicKeyAlgorithm, (byte)hashAlgorithm }, hashData));
    }

    public int getPublicKeyAlgorithm()
    {
        return data[0] & 0xff;
    }

    public int getHashAlgorithm()
    {
        return data[1] & 0xff;
    }

    public byte[] getHashData()
    {
        return Arrays.copyOfRange(data, 2, data.length);
    }
}