SecretKeyPacket: Add AEAD usage tag
public static final int USAGE_NONE = 0x00;
public static final int USAGE_CHECKSUM = 0xff;
public static final int USAGE_SHA1 = 0xfe;
+ public static final int USAGE_AEAD = 0xfd;
private PublicKeyPacket pubKeyPacket;
private byte[] secKeyData;
