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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.gpg.keybox;

import java.io.IOException;

import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Hex;


/**
 * First blob contains meta data about the KeyBox.
 */
public class FirstBlob
    extends Blob
{
    private final int headerFlags;
    private final long fileCreatedAt;
    private final long lastMaintenanceRun;

    private FirstBlob(
        int base,
        long length,
        BlobType type,
        int version,
        int headerFlags,
        long fileCreatedAt,
        long lastMaintenanceRun)
    {
        super(base, length, type, version);
        this.headerFlags = headerFlags;
        this.fileCreatedAt = fileCreatedAt;
        this.lastMaintenanceRun = lastMaintenanceRun;
    }

    static FirstBlob parseContent(int base, long length, BlobType type, int version, KeyBoxByteBuffer buffer)
        throws IOException
    {

        int headerFlags = buffer.u16();
        byte[] magic = buffer.bN(4);


        if (!Arrays.areEqual(magic, magicBytes))
        {
            // -DM Hex.toHexString
            // -DM Hex.toHexString
            throw new IOException("Incorrect magic expecting " + Hex.toHexString(magicBytes) + " but got " + Hex.toHexString(magic));
        }


        buffer.u32(); // RFU = Reserved for Future Use
        long fileCreatedAt = buffer.u32();
        long lastMaintenanceRun = buffer.u32();
        buffer.u32();  // RFU
        buffer.u32();  // RFU


        return new FirstBlob(base, length, type, version, headerFlags, fileCreatedAt, lastMaintenanceRun);
    }

    public int getHeaderFlags()
    {
        return headerFlags;
    }

    public long getFileCreatedAt()
    {
        return fileCreatedAt;
    }

    public long getLastMaintenanceRun()
    {
        return lastMaintenanceRun;
    }
}