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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.gpg.keybox;

import java.io.IOException;

import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Strings;

public class UserID
{
    private final long offsetToUserId;
    private final long lengthOfUserId;
    private final int userIdFlags;
    private final int validity;
    private final int reserved;
    private final byte[] userID;

    private UserID(long offsetToUserId, long lengthOfUserId, int userIdFlags, int validity, int reserved, byte[] userID)
    {
        this.offsetToUserId = offsetToUserId;
        this.lengthOfUserId = lengthOfUserId;
        this.userIdFlags = userIdFlags;
        this.validity = validity;
        this.reserved = reserved;
        this.userID = userID;
    }

    static UserID getInstance(Object src, int base)
        throws IOException
    {
        if (src instanceof UserID)
        {
            return (UserID)src;
        }

        KeyBoxByteBuffer buffer = KeyBoxByteBuffer.wrap(src);

        long offsetToUserId = buffer.u32();
        long lengthOfUserId = buffer.u32();
        int specialUserIdFlags = buffer.u16();


        int validity = buffer.u8();
        int reserved = buffer.u8();

        byte[] userID = buffer.rangeOf(
            (int)(base + offsetToUserId),
            (int)(base + offsetToUserId + lengthOfUserId));


        return new UserID(offsetToUserId, lengthOfUserId, specialUserIdFlags, validity, reserved, userID);

    }


    public long getOffsetToUserId()
    {
        return offsetToUserId;
    }

    public long getLengthOfUserId()
    {
        return lengthOfUserId;
    }

    public long getUserIdFlags()
    {
        return userIdFlags;
    }

    public int getValidity()
    {
        return validity;
    }

    public int getReserved()
    {
        return reserved;
    }

    public byte[] getUserID()
    {
        return Arrays.clone(userID);
    }

    public String getUserIDAsString()
    {
        return Strings.fromUTF8ByteArray(userID);
    }
}