org.bouncycastle.bcpg.sig.IntendedRecipientFingerprint 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 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.KeyIdentifier;
import org.bouncycastle.bcpg.SignatureSubpacket;
import org.bouncycastle.bcpg.SignatureSubpacketTags;
import org.bouncycastle.util.Arrays;

/**
 * Signature Subpacket containing the fingerprint of the intended recipients primary key.
 * This packet can be used to prevent malicious forwarding/replay attacks.
 *
 * @see 
 *     RFC9580 - Intended Recipient Fingerprint
 */
public class IntendedRecipientFingerprint
    extends SignatureSubpacket
{
    public IntendedRecipientFingerprint(
        boolean    critical,
        boolean    isLongLength,
        byte[]     data)
    {
        super(SignatureSubpacketTags.INTENDED_RECIPIENT_FINGERPRINT, critical, isLongLength, data);
    }

    public IntendedRecipientFingerprint(
        boolean    critical,
        int        keyVersion,
        byte[]     fingerprint)
    {
        super(SignatureSubpacketTags.INTENDED_RECIPIENT_FINGERPRINT, critical, false,
            Arrays.prepend(fingerprint, (byte)keyVersion));
    }

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

    public byte[] getFingerprint()
    {
        return Arrays.copyOfRange(data, 1, data.length);
    }

    public KeyIdentifier getKeyIdentifier()
    {
        return new KeyIdentifier(getFingerprint());
    }
}