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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.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);
    }
}