+# see RFC 4880 section 4.3
+my $packet_types = { pubkey_enc_session => 1,
+ sig => 2,
+ symkey_enc_session => 3,
+ onepass_sig => 4,
+ seckey => 5,
+ pubkey => 6,
+ sec_subkey => 7,
+ compressed_data => 8,
+ symenc_data => 9,
+ marker => 10,
+ literal => 11,
+ trust => 12,
+ uid => 13,
+ pub_subkey => 14,
+ uat => 17,
+ symenc_w_integrity => 18,
+ mdc => 19,
+ };
+
+# see RFC 4880 section 5.2.1
+my $sig_types = { binary_doc => 0x00,
+ text_doc => 0x01,
+ standalone => 0x02,
+ generic_certification => 0x10,
+ persona_certification => 0x11,
+ casual_certification => 0x12,
+ positive_certification => 0x13,
+ subkey_binding => 0x18,
+ primary_key_binding => 0x19,
+ key_signature => 0x1f,
+ key_revocation => 0x20,
+ subkey_revocation => 0x28,
+ certification_revocation => 0x30,
+ timestamp => 0x40,
+ thirdparty => 0x50,
+ };
+
+
+# see RFC 4880 section 5.2.3.1
+my $subpacket_types => { sig_creation_time => 2,
+ sig_expiration_time => 3,
+ exportable => 4,
+ trust_sig => 5,
+ regex => 6,
+ revocable => 7,
+ key_expiration_time => 9,
+ preferred_cipher => 11,
+ revocation_key => 12,
+ issuer => 16,
+ notation => 20,
+ preferred_digest => 21,
+ keyserver_prefs => 23,
+ preferred_keyserver => 24,
+ primary_uid => 25,
+ policy_uri => 26,
+ usage_flags => 27,
+ signers_uid => 28,
+ revocation_reason => 29,
+ features => 30,
+ signature_target => 31,
+ embedded_signature = 32,
+ };
+