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<h1 class="page-title">Source: encoding/armor.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
// Copyright (C) 2011 Recurity Labs GmbH
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
/**
* @requires encoding/base64
* @requires enums
* @requires config
* @module encoding/armor
*/
var base64 = require('./base64.js'),
enums = require('../enums.js'),
config = require('../config');
/**
* Finds out which Ascii Armoring type is used. This is an internal function
* @param {String} text [String] ascii armored text
* @returns {Integer} 0 = MESSAGE PART n of m
* 1 = MESSAGE PART n
* 2 = SIGNED MESSAGE
* 3 = PGP MESSAGE
* 4 = PUBLIC KEY BLOCK
* 5 = PRIVATE KEY BLOCK
* null = unknown
*/
function getType(text) {
var reHeader = /^-----([^-]+)-----$\n/m;
var header = text.match(reHeader);
// BEGIN PGP MESSAGE, PART X/Y
// Used for multi-part messages, where the armor is split amongst Y
// parts, and this is the Xth part out of Y.
if (header[1].match(/BEGIN PGP MESSAGE, PART \d+\/\d+/)) {
return enums.armor.multipart_section;
} else
// BEGIN PGP MESSAGE, PART X
// Used for multi-part messages, where this is the Xth part of an
// unspecified number of parts. Requires the MESSAGE-ID Armor
// Header to be used.
if (header[1].match(/BEGIN PGP MESSAGE, PART \d+/)) {
return enums.armor.multipart_last;
} else
// BEGIN PGP SIGNATURE
// Used for detached signatures, OpenPGP/MIME signatures, and
// cleartext signatures. Note that PGP 2.x uses BEGIN PGP MESSAGE
// for detached signatures.
if (header[1].match(/BEGIN PGP SIGNED MESSAGE/)) {
return enums.armor.signed;
} else
// BEGIN PGP MESSAGE
// Used for signed, encrypted, or compressed files.
if (header[1].match(/BEGIN PGP MESSAGE/)) {
return enums.armor.message;
} else
// BEGIN PGP PUBLIC KEY BLOCK
// Used for armoring public keys.
if (header[1].match(/BEGIN PGP PUBLIC KEY BLOCK/)) {
return enums.armor.public_key;
} else
// BEGIN PGP PRIVATE KEY BLOCK
// Used for armoring private keys.
if (header[1].match(/BEGIN PGP PRIVATE KEY BLOCK/)) {
return enums.armor.private_key;
}
}
/**
* Add additional information to the armor version of an OpenPGP binary
* packet block.
* @author Alex
* @version 2011-12-16
* @returns {String} The header information
*/
function addheader() {
var result = "";
if (config.show_version) {
result += "Version: " + config.versionstring + '\r\n';
}
if (config.show_comment) {
result += "Comment: " + config.commentstring + '\r\n';
}
result += '\r\n';
return result;
}
/**
* Calculates a checksum over the given data and returns it base64 encoded
* @param {String} data Data to create a CRC-24 checksum for
* @return {String} Base64 encoded checksum
*/
function getCheckSum(data) {
var c = createcrc24(data);
var str = "" + String.fromCharCode(c >> 16) +
String.fromCharCode((c >> 8) & 0xFF) +
String.fromCharCode(c & 0xFF);
return base64.encode(str);
}
/**
* Calculates the checksum over the given data and compares it with the
* given base64 encoded checksum
* @param {String} data Data to create a CRC-24 checksum for
* @param {String} checksum Base64 encoded checksum
* @return {Boolean} True if the given checksum is correct; otherwise false
*/
function verifyCheckSum(data, checksum) {
var c = getCheckSum(data);
var d = checksum;
return c[0] == d[0] && c[1] == d[1] && c[2] == d[2];
}
/**
* Internal function to calculate a CRC-24 checksum over a given string (data)
* @param {String} data Data to create a CRC-24 checksum for
* @return {Integer} The CRC-24 checksum as number
*/
var crc_table = [
0x00000000, 0x00864cfb, 0x018ad50d, 0x010c99f6, 0x0393e6e1, 0x0315aa1a, 0x021933ec, 0x029f7f17, 0x07a18139,
0x0727cdc2, 0x062b5434, 0x06ad18cf, 0x043267d8, 0x04b42b23, 0x05b8b2d5, 0x053efe2e, 0x0fc54e89, 0x0f430272,
0x0e4f9b84, 0x0ec9d77f, 0x0c56a868, 0x0cd0e493, 0x0ddc7d65, 0x0d5a319e, 0x0864cfb0, 0x08e2834b, 0x09ee1abd,
0x09685646, 0x0bf72951, 0x0b7165aa, 0x0a7dfc5c, 0x0afbb0a7, 0x1f0cd1e9, 0x1f8a9d12, 0x1e8604e4, 0x1e00481f,
0x1c9f3708, 0x1c197bf3, 0x1d15e205, 0x1d93aefe, 0x18ad50d0, 0x182b1c2b, 0x192785dd, 0x19a1c926, 0x1b3eb631,
0x1bb8faca, 0x1ab4633c, 0x1a322fc7, 0x10c99f60, 0x104fd39b, 0x11434a6d, 0x11c50696, 0x135a7981, 0x13dc357a,
0x12d0ac8c, 0x1256e077, 0x17681e59, 0x17ee52a2, 0x16e2cb54, 0x166487af, 0x14fbf8b8, 0x147db443, 0x15712db5,
0x15f7614e, 0x3e19a3d2, 0x3e9fef29, 0x3f9376df, 0x3f153a24, 0x3d8a4533, 0x3d0c09c8, 0x3c00903e, 0x3c86dcc5,
0x39b822eb, 0x393e6e10, 0x3832f7e6, 0x38b4bb1d, 0x3a2bc40a, 0x3aad88f1, 0x3ba11107, 0x3b275dfc, 0x31dced5b,
0x315aa1a0,
0x30563856, 0x30d074ad, 0x324f0bba, 0x32c94741, 0x33c5deb7, 0x3343924c, 0x367d6c62, 0x36fb2099, 0x37f7b96f,
0x3771f594, 0x35ee8a83, 0x3568c678, 0x34645f8e, 0x34e21375, 0x2115723b, 0x21933ec0, 0x209fa736, 0x2019ebcd,
0x228694da, 0x2200d821, 0x230c41d7, 0x238a0d2c, 0x26b4f302, 0x2632bff9, 0x273e260f, 0x27b86af4, 0x252715e3,
0x25a15918, 0x24adc0ee, 0x242b8c15, 0x2ed03cb2, 0x2e567049, 0x2f5ae9bf, 0x2fdca544, 0x2d43da53, 0x2dc596a8,
0x2cc90f5e, 0x2c4f43a5, 0x2971bd8b, 0x29f7f170, 0x28fb6886, 0x287d247d, 0x2ae25b6a, 0x2a641791, 0x2b688e67,
0x2beec29c, 0x7c3347a4, 0x7cb50b5f, 0x7db992a9, 0x7d3fde52, 0x7fa0a145, 0x7f26edbe, 0x7e2a7448, 0x7eac38b3,
0x7b92c69d, 0x7b148a66, 0x7a181390, 0x7a9e5f6b, 0x7801207c, 0x78876c87, 0x798bf571, 0x790db98a, 0x73f6092d,
0x737045d6, 0x727cdc20, 0x72fa90db, 0x7065efcc, 0x70e3a337, 0x71ef3ac1, 0x7169763a, 0x74578814, 0x74d1c4ef,
0x75dd5d19, 0x755b11e2, 0x77c46ef5, 0x7742220e, 0x764ebbf8, 0x76c8f703, 0x633f964d, 0x63b9dab6, 0x62b54340,
0x62330fbb,
0x60ac70ac, 0x602a3c57, 0x6126a5a1, 0x61a0e95a, 0x649e1774, 0x64185b8f, 0x6514c279, 0x65928e82, 0x670df195,
0x678bbd6e, 0x66872498, 0x66016863, 0x6cfad8c4, 0x6c7c943f, 0x6d700dc9, 0x6df64132, 0x6f693e25, 0x6fef72de,
0x6ee3eb28, 0x6e65a7d3, 0x6b5b59fd, 0x6bdd1506, 0x6ad18cf0, 0x6a57c00b, 0x68c8bf1c, 0x684ef3e7, 0x69426a11,
0x69c426ea, 0x422ae476, 0x42aca88d, 0x43a0317b, 0x43267d80, 0x41b90297, 0x413f4e6c, 0x4033d79a, 0x40b59b61,
0x458b654f, 0x450d29b4, 0x4401b042, 0x4487fcb9, 0x461883ae, 0x469ecf55, 0x479256a3, 0x47141a58, 0x4defaaff,
0x4d69e604, 0x4c657ff2, 0x4ce33309, 0x4e7c4c1e, 0x4efa00e5, 0x4ff69913, 0x4f70d5e8, 0x4a4e2bc6, 0x4ac8673d,
0x4bc4fecb, 0x4b42b230, 0x49ddcd27, 0x495b81dc, 0x4857182a, 0x48d154d1, 0x5d26359f, 0x5da07964, 0x5cace092,
0x5c2aac69, 0x5eb5d37e, 0x5e339f85, 0x5f3f0673, 0x5fb94a88, 0x5a87b4a6, 0x5a01f85d, 0x5b0d61ab, 0x5b8b2d50,
0x59145247, 0x59921ebc, 0x589e874a, 0x5818cbb1, 0x52e37b16, 0x526537ed, 0x5369ae1b, 0x53efe2e0, 0x51709df7,
0x51f6d10c,
0x50fa48fa, 0x507c0401, 0x5542fa2f, 0x55c4b6d4, 0x54c82f22, 0x544e63d9, 0x56d11cce, 0x56575035, 0x575bc9c3,
0x57dd8538
];
function createcrc24(input) {
var crc = 0xB704CE;
var index = 0;
while ((input.length - index) > 16) {
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 1)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 2)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 3)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 4)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 5)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 6)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 7)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 8)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 9)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 10)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 11)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 12)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 13)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 14)) & 0xff];
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index + 15)) & 0xff];
index += 16;
}
for (var j = index; j < input.length; j++) {
crc = (crc << 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index++)) & 0xff];
}
return crc & 0xffffff;
}
/**
* Splits a message into two parts, the headers and the body. This is an internal function
* @param {String} text OpenPGP armored message part
* @returns {(Boolean|Object)} Either false in case of an error
* or an object with attribute "headers" containing the headers and
* and an attribute "body" containing the body.
*/
function splitHeaders(text) {
var reEmptyLine = /^[\t ]*\n/m;
var headers = "";
var body = text;
var matchResult = reEmptyLine.exec(text);
if (matchResult !== null) {
headers = text.slice(0, matchResult.index);
body = text.slice(matchResult.index + matchResult[0].length);
}
return { headers: headers, body: body };
}
/**
* Splits a message into two parts, the body and the checksum. This is an internal function
* @param {String} text OpenPGP armored message part
* @returns {(Boolean|Object)} Either false in case of an error
* or an object with attribute "body" containing the body
* and an attribute "checksum" containing the checksum.
*/
function splitChecksum(text) {
var reChecksumStart = /^=/m;
var body = text;
var checksum = "";
var matchResult = reChecksumStart.exec(text);
if (matchResult !== null) {
body = text.slice(0, matchResult.index);
checksum = text.slice(matchResult.index + 1);
}
return { body: body, checksum: checksum };
}
/**
* DeArmor an OpenPGP armored message; verify the checksum and return
* the encoded bytes
* @param {String} text OpenPGP armored message
* @returns {Object} An object with attribute "text" containing the message text,
* an attribute "data" containing the bytes and "type" for the ASCII armor type
* @static
*/
function dearmor(text) {
var reSplit = /^-----[^-]+-----$\n/m;
text = text.replace(/\r/g, '');
var type = getType(text);
if (!type) {
throw new Error('Unknow ASCII armor type');
}
var splittext = text.split(reSplit);
// IE has a bug in split with a re. If the pattern matches the beginning of the
// string it doesn't create an empty array element 0. So we need to detect this
// so we know the index of the data we are interested in.
var indexBase = 1;
var result, checksum, msg;
if (text.search(reSplit) != splittext[0].length) {
indexBase = 0;
}
if (type != 2) {
msg = splitHeaders(splittext[indexBase]);
var msg_sum = splitChecksum(msg.body);
result = {
data: base64.decode(msg_sum.body),
type: type
};
checksum = msg_sum.checksum;
} else {
// Reverse dash-escaping for msg and remove trailing whitespace at end of line
msg = splitHeaders(splittext[indexBase].replace(/^- /mg, '').replace(/[\t ]+\n/g, "\n"));
var sig = splitHeaders(splittext[indexBase + 1].replace(/^- /mg, ''));
var sig_sum = splitChecksum(sig.body);
result = {
text: msg.body.replace(/\n$/, '').replace(/\n/g, "\r\n"),
data: base64.decode(sig_sum.body),
type: type
};
checksum = sig_sum.checksum;
}
if (!verifyCheckSum(result.data, checksum)) {
throw new Error("Ascii armor integrity check on message failed: '" +
checksum +
"' should be '" +
getCheckSum(result) + "'");
} else {
return result;
}
}
/**
* Armor an OpenPGP binary packet block
* @param {Integer} messagetype type of the message
* @param body
* @param {Integer} partindex
* @param {Integer} parttotal
* @returns {String} Armored text
* @static
*/
function armor(messagetype, body, partindex, parttotal) {
var result = "";
switch (messagetype) {
case enums.armor.multipart_section:
result += "-----BEGIN PGP MESSAGE, PART " + partindex + "/" + parttotal + "-----\r\n";
result += addheader();
result += base64.encode(body);
result += "\r\n=" + getCheckSum(body) + "\r\n";
result += "-----END PGP MESSAGE, PART " + partindex + "/" + parttotal + "-----\r\n";
break;
case enums.armor.mutlipart_last:
result += "-----BEGIN PGP MESSAGE, PART " + partindex + "-----\r\n";
result += addheader();
result += base64.encode(body);
result += "\r\n=" + getCheckSum(body) + "\r\n";
result += "-----END PGP MESSAGE, PART " + partindex + "-----\r\n";
break;
case enums.armor.signed:
result += "\r\n-----BEGIN PGP SIGNED MESSAGE-----\r\n";
result += "Hash: " + body.hash + "\r\n\r\n";
result += body.text.replace(/\n-/g, "\n- -");
result += "\r\n-----BEGIN PGP SIGNATURE-----\r\n";
result += addheader();
result += base64.encode(body.data);
result += "\r\n=" + getCheckSum(body.data) + "\r\n";
result += "-----END PGP SIGNATURE-----\r\n";
break;
case enums.armor.message:
result += "-----BEGIN PGP MESSAGE-----\r\n";
result += addheader();
result += base64.encode(body);
result += "\r\n=" + getCheckSum(body) + "\r\n";
result += "-----END PGP MESSAGE-----\r\n";
break;
case enums.armor.public_key:
result += "-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n";
result += addheader();
result += base64.encode(body);
result += "\r\n=" + getCheckSum(body) + "\r\n";
result += "-----END PGP PUBLIC KEY BLOCK-----\r\n\r\n";
break;
case enums.armor.private_key:
result += "-----BEGIN PGP PRIVATE KEY BLOCK-----\r\n";
result += addheader();
result += base64.encode(body);
result += "\r\n=" + getCheckSum(body) + "\r\n";
result += "-----END PGP PRIVATE KEY BLOCK-----\r\n";
break;
}
return result;
}
module.exports = {
encode: armor,
decode: dearmor
};
</code></pre>
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