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packet.ml
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packet.ml
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(***********************************************************************)
(* packet.ml - Type definitions and simple functions related to PGP *)
(* packets *)
(* *)
(* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, *)
(* 2011, 2012 Yaron Minsky and Contributors *)
(* *)
(* This file is part of SKS. SKS is free software; you can *)
(* redistribute it and/or modify it under the terms of the GNU General *)
(* Public License as published by the Free Software Foundation; either *)
(* version 2 of the License, or (at your option) any later version. *)
(* *)
(* This program is distributed in the hope that it will be useful, but *)
(* WITHOUT ANY WARRANTY; without even the implied warranty of *)
(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *)
(* General Public License for more details. *)
(* *)
(* You should have received a copy of the GNU General Public License *)
(* along with this program; if not, write to the Free Software *)
(* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *)
(* USA or see <http://www.gnu.org/licenses/>. *)
(***********************************************************************)
open Printf
type ptype = | Reserved
| Public_Key_Encrypted_Session_Key_Packet
| Signature_Packet
| Symmetric_Key_Encrypted_Session_Key_Packet
| One_Pass_Signature_Packet
| Secret_Key_Packet
| Public_Key_Packet
| Secret_Subkey_Packet
| Compressed_Data_Packet
| Symmetrically_Encrypted_Data_Packet
| Marker_Packet
| Literal_Data_Packet
| Trust_Packet
| User_ID_Packet
| User_Attribute_Packet
| Sym_Encrypted_and_Integrity_Protected_Data_Packet
| Modification_Detection_Code_Packet
| Public_Subkey_Packet
| Private_or_Experimental_ptype
| Unexpected_ptype
type packet = { content_tag: int;
packet_type: ptype;
packet_length: int;
packet_body: string;
}
type sigsubpacket =
{ ssp_length: int;
ssp_type: int;
ssp_body: string;
}
let ssp_type_to_string i = match i with
| 2 -> "signature creation time"
| 3 -> "signature expiration time"
| 4 -> "exportable certification"
| 5 -> "trust signature"
| 6 -> "regular expression"
| 7 -> "revocable"
| 9 -> "key expiration time"
| 10 -> "placeholder for backward compatibility"
| 11 -> "preferred symmetric algorithms"
| 12 -> "revocation key"
| 16 -> "issuer key ID"
| 20 -> "notation data"
| 21 -> "preferred hash algorithms"
| 22 -> "preferred compression algorithms"
| 23 -> "key server preferences"
| 24 -> "preferred key server"
| 25 -> "primary user id"
| 26 -> "policy URL"
| 27 -> "key flags"
| 28 -> "signer's user id"
| 29 -> "reason for revocation"
| x when x >= 100 && x <= 110 -> "internal or user-defined"
| _ -> failwith "Unexpected sigsubpacket type"
type key = packet list
let sigtype_to_string sigtype = match sigtype with
| 0x00 -> "signature of binary document"
| 0x01 -> "signature of canonical text document"
| 0x02 -> "Standalone signature"
| 0x10 -> "Generic certification of a User ID and Public Key packet"
| 0x11 -> "Persona certification of a User ID and Public Key packet"
| 0x12 -> "Casual certification of a User ID and Public Key packet"
| 0x13 -> "Positive certification of a User ID and Public Key packet"
| 0x18 -> "Subkey Binding Signature"
| 0x1F -> "Signature directly on a key"
| 0x20 -> "Key revocation signature"
| 0x28 -> "Subkey revocation signature"
| 0x30 -> "Certification revocation signature"
| 0x40 -> "Timestamp signature"
| _ -> "UNEXPECTED SIGTYPE"
let content_tag_to_ptype tag = match tag with
| 0 -> Reserved
| 1 -> Public_Key_Encrypted_Session_Key_Packet
| 2 -> Signature_Packet
| 3 -> Symmetric_Key_Encrypted_Session_Key_Packet
| 4 -> One_Pass_Signature_Packet
| 5 -> Secret_Key_Packet
| 6 -> Public_Key_Packet
| 7 -> Secret_Subkey_Packet
| 8 -> Compressed_Data_Packet
| 9 -> Symmetrically_Encrypted_Data_Packet
| 10 -> Marker_Packet
| 11 -> Literal_Data_Packet
| 12 -> Trust_Packet
| 13 -> User_ID_Packet
| 14 -> Public_Subkey_Packet
| 17 -> User_Attribute_Packet
| 18 -> Sym_Encrypted_and_Integrity_Protected_Data_Packet
| 19 -> Modification_Detection_Code_Packet
| 60 | 61 | 62 | 63 -> Private_or_Experimental_ptype
| _ -> Unexpected_ptype
let ptype_to_string ptype = match ptype with
| Reserved -> "Reserved - a packet tag must not have this value"
| Public_Key_Encrypted_Session_Key_Packet -> "Public-Key Encrypted Session Key Packet"
| Signature_Packet -> "Signature Packet"
| Symmetric_Key_Encrypted_Session_Key_Packet -> "Symmetric-Key Encrypted Session Key Packet"
| One_Pass_Signature_Packet -> "One-Pass Signature Packet"
| Secret_Key_Packet -> "Secret Key Packet"
| Public_Key_Packet -> "Public Key Packet"
| Secret_Subkey_Packet -> "Secret Subkey Packet"
| Compressed_Data_Packet -> "Compressed Data Packet"
| Symmetrically_Encrypted_Data_Packet -> "Symmetrically Encrypted Data Packet"
| Marker_Packet -> "Marker Packet"
| Literal_Data_Packet -> "Literal Data Packet"
| Trust_Packet -> "Trust Packet"
| User_ID_Packet -> "User ID Packet"
| Public_Subkey_Packet -> "Public Subkey Packet"
| User_Attribute_Packet -> "User Attribute Packet"
| Sym_Encrypted_and_Integrity_Protected_Data_Packet ->
"Sym Encrypted and Integrity Protected Data Packet"
| Modification_Detection_Code_Packet -> "Modification Detection Code Packet"
| Private_or_Experimental_ptype -> "Private or Experimental Values"
| Unexpected_ptype -> "Unexpected value"
type mpi = { mpi_bits: int;
mpi_data: string;
}
let pubkey_algorithm_string i = match i with
| 1 -> "RSA (Encrypt or Sign)"
| 2 -> "RSA Encrypt-Only"
| 3 -> "RSA Sign-Only"
| 16 -> "Elgamal (Encrypt-Only), see [ELGAMAL]"
| 17 -> "DSA (Digital Signature Standard)"
| 18 -> "Reserved for Elliptic Curve"
| 19 -> "Reserved for ECDSA"
| 20 -> "Elgamal (Encrypt or Sign)"
| 21 -> "Reserved for Diffie-Hellman (X9.42) as defined for IETF-S/MIME"
| x when x >= 100 && x <= 110 -> "Private/Experimental algorithm."
| _ -> "Unknown Public Key Algorithm"
type pubkeyinfo =
{ pk_version: int;
pk_ctime: int64;
pk_expiration: int option;
pk_alg: int;
pk_keylen: int;
}
type sigtype = | Signature_of_a_binary_document
| Signature_of_a_canonical_text_document
| Standalone_signature
| Generic_certification_of_a_User_ID_and_Public_Key_packet
| Persona_certification_of_a_User_ID_and_Public_Key_packet
| Casual_certification_of_a_User_ID_and_Public_Key_packet
| Positive_certification_of_a_User_ID_and_Public_Key_packet
| Subkey_Binding_Signature
| Signature_directly_on_a_key
| Key_revocation_signature
| Subkey_revocation_signature
| Certification_revocation_signature
| Timestamp_signature
| Unexpected_sigtype
type v3sig =
{ v3s_sigtype: int;
v3s_ctime: int64;
v3s_keyid: string;
v3s_pk_alg: int;
v3s_hash_alg: int;
v3s_hash_value: string;
v3s_mpis: mpi list;
}
type v4sig =
{ v4s_sigtype: int;
v4s_pk_alg: int;
v4s_hashed_subpackets: sigsubpacket list;
v4s_unhashed_subpackets: sigsubpacket list;
v4s_hash_value: string;
v4s_mpis: mpi list;
}
type signature = V3sig of v3sig | V4sig of v4sig
let int_to_sigtype byte =
match byte with
| 0x00 -> Signature_of_a_binary_document
| 0x01 -> Signature_of_a_canonical_text_document
| 0x02 -> Standalone_signature
| 0x10 -> Generic_certification_of_a_User_ID_and_Public_Key_packet
| 0x11 -> Persona_certification_of_a_User_ID_and_Public_Key_packet
| 0x12 -> Casual_certification_of_a_User_ID_and_Public_Key_packet
| 0x13 -> Positive_certification_of_a_User_ID_and_Public_Key_packet
| 0x18 -> Subkey_Binding_Signature
| 0x1F -> Signature_directly_on_a_key
| 0x20 -> Key_revocation_signature
| 0x28 -> Subkey_revocation_signature
| 0x30 -> Certification_revocation_signature
| 0x40 -> Timestamp_signature
| _ -> Unexpected_sigtype
let content_tag_to_string tag =
ptype_to_string (content_tag_to_ptype tag)
let print_packet packet =
printf "%s\n" (ptype_to_string packet.packet_type);
printf "Length: %d\n" packet.packet_length;
if packet.packet_type = User_ID_Packet
then (print_string packet.packet_body; print_string "\n")
(** write out new-style packet *)
let write_packet_new packet cout =
(* specify new packet format *)
cout#write_byte (packet.content_tag lor 0xC0);
cout#write_byte 0xFF;
cout#write_int packet.packet_length;
cout#write_string packet.packet_body
let pk_alg_to_ident i = match i with
| 1 -> "R" (* RSA sign and encrypt *)
| 2 -> "r" (* RSA encrypt *)
| 3 -> "s" (* RSA sign *)
| 16 -> "g" (* ElGamal encrypt *)
| 20 -> "G" (* ElGamal sign and encrypt *)
| 17 -> "D" (* DSA *)
| _ -> "?" (* NoClue *)
(** writes out packet, using old-style packets when possible *)
let write_packet_old packet cout =
if packet.content_tag >= 16
then (* write new-style packet *)
write_packet_new packet cout
else (* write old-style packet *)
begin
let length_type =
if packet.packet_length < 256 then 0
else if packet.packet_length < 65536 then 1
else 2
in
cout#write_byte ((packet.content_tag lsl 2) lor 0x80 lor length_type);
(match length_type with
0 -> cout#write_byte packet.packet_length
| 1 ->
cout#write_byte ((packet.packet_length lsr 8) land 0xFF);
cout#write_byte (packet.packet_length land 0xFF);
| 2 ->
cout#write_byte ((packet.packet_length lsr 24) land 0xFF);
cout#write_byte ((packet.packet_length lsr 16) land 0xFF);
cout#write_byte ((packet.packet_length lsr 8) land 0xFF);
cout#write_byte (packet.packet_length land 0xFF);
| _ ->
failwith "Packet.write_packet_old: Bug -- bad packet length"
);
cout#write_string packet.packet_body
end
let write_packet = write_packet_old