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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;
import org.bouncycastle.util.Strings;

/**
 * Regexp Packet - RFC 4880 5.2.3.14. Note: the RFC says the byte encoding is to be null terminated.
 */
public class RegularExpression
    extends SignatureSubpacket
{
    public RegularExpression(
            boolean critical,
            boolean isLongLength,
            byte[] data)
    {
        super(SignatureSubpacketTags.REG_EXP, critical, isLongLength, data);
        if (data[data.length - 1] != 0)
        {
            throw new IllegalArgumentException("data in regex missing null termination");
        }
    }

    public RegularExpression(
            boolean critical,
            String regex)
    {
        super(
                SignatureSubpacketTags.REG_EXP,
                critical,
                false,
                toNullTerminatedUTF8ByteArray(regex));
    }

    public String getRegex()
    {
        // last byte is null terminator
        return Strings.fromUTF8ByteArray(data, 0, data.length - 1);
    }

    public byte[] getRawRegex()
    {
        return Arrays.clone(data);
    }

    private static byte[] toNullTerminatedUTF8ByteArray(String string)
    {
        byte[] utf8 = Strings.toUTF8ByteArray(string);
        return Arrays.append(utf8, (byte)0);
    }
}