fork-openpgpjs/doc/openpgp.encoding.asciiarmor.js.html
Michal Kolodziej 23295342fc Added utf8 awareness to the literal and userid packet classes. Made s2k
work correctly with utf8 strings. Fixeda visibility issue with the
testing suite and added relevant unit tests.
2013-04-16 10:47:17 +02:00

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<h1 class="page-title">Source: encoding/openpgp.encoding.asciiarmor.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
/**
* DeArmor an OpenPGP armored message; verify the checksum and return
* the encoded bytes
* @param {String} text OpenPGP armored message
* @returns {(String|Object)} Either the bytes of the decoded message
* or an object with attribute "text" containing the message text
* and an attribute "openpgp" containing the bytes.
*/
function openpgp_encoding_deArmor(text) {
var type = getPGPMessageType(text);
if (type != 2) {
var splittedtext = text.split('-----');
data = { openpgp: openpgp_encoding_base64_decode(splittedtext[2].split('\n\n')[1].split("\n=")[0].replace(/\n- /g,"\n")),
type: type};
if (verifyCheckSum(data.openpgp, splittedtext[2].split('\n\n')[1].split("\n=")[1].split('\n')[0]))
return data;
else
util.print_error("Ascii armor integrity check on message failed: '"+splittedtext[2].split('\n\n')[1].split("\n=")[1].split('\n')[0]+"' should be '"+getCheckSum(data))+"'";
} else {
var splittedtext = text.split('-----');
var result = { text: splittedtext[2].replace(/\n- /g,"\n").split("\n\n")[1],
openpgp: openpgp_encoding_base64_decode(splittedtext[4].split("\n\n")[1].split("\n=")[0]),
type: type};
if (verifyCheckSum(result.openpgp, splittedtext[4].split("\n\n")[1].split("\n=")[1]))
return result;
else
util.print_error("Ascii armor integrity check on message failed");
}
}
/**
* 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 getPGPMessageType(text) {
var splittedtext = text.split('-----');
// 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 (splittedtext[1].match(/BEGIN PGP MESSAGE, PART \d+\/\d+/)) {
return 0;
} 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 (splittedtext[1].match(/BEGIN PGP MESSAGE, PART \d+/)) {
return 1;
} 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 (splittedtext[1].match(/BEGIN PGP SIGNED MESSAGE/)) {
return 2;
} else
// BEGIN PGP MESSAGE
// Used for signed, encrypted, or compressed files.
if (splittedtext[1].match(/BEGIN PGP MESSAGE/)) {
return 3;
} else
// BEGIN PGP PUBLIC KEY BLOCK
// Used for armoring public keys.
if (splittedtext[1].match(/BEGIN PGP PUBLIC KEY BLOCK/)) {
return 4;
} else
// BEGIN PGP PRIVATE KEY BLOCK
// Used for armoring private keys.
if (splittedtext[1].match(/BEGIN PGP PRIVATE KEY BLOCK/)) {
return 5;
}
}
/**
* 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 openpgp_encoding_armor_addheader() {
var result = "";
if (openpgp.config.config.show_version) {
result += "Version: "+openpgp.config.versionstring+'\r\n';
}
if (openpgp.config.config.show_comment) {
result += "Comment: "+openpgp.config.commentstring+'\r\n';
}
result += '\r\n';
return result;
}
/**
* Armor an OpenPGP binary packet block
* @param {Integer} messagetype type of the message
* @param data
* @param {Integer} partindex
* @param {Integer} parttotal
* @returns {String} Armored text
*/
function openpgp_encoding_armor(messagetype, data, partindex, parttotal) {
var result = "";
switch(messagetype) {
case 0:
result += "-----BEGIN PGP MESSAGE, PART "+partindex+"/"+parttotal+"-----\r\n";
result += openpgp_encoding_armor_addheader();
result += openpgp_encoding_base64_encode(data);
result += "\r\n="+getCheckSum(data)+"\r\n";
result += "-----END PGP MESSAGE, PART "+partindex+"/"+parttotal+"-----\r\n";
break;
case 1:
result += "-----BEGIN PGP MESSAGE, PART "+partindex+"-----\r\n";
result += openpgp_encoding_armor_addheader();
result += openpgp_encoding_base64_encode(data);
result += "\r\n="+getCheckSum(data)+"\r\n";
result += "-----END PGP MESSAGE, PART "+partindex+"-----\r\n";
break;
case 2:
result += "\r\n-----BEGIN PGP SIGNED MESSAGE-----\r\nHash: "+data.hash+"\r\n\r\n";
result += data.text.replace(/\n-/g,"\n- -");
result += "\r\n-----BEGIN PGP SIGNATURE-----\r\n";
result += openpgp_encoding_armor_addheader();
result += openpgp_encoding_base64_encode(data.openpgp);
result += "\r\n="+getCheckSum(data.openpgp)+"\r\n";
result += "-----END PGP SIGNATURE-----\r\n";
break;
case 3:
result += "-----BEGIN PGP MESSAGE-----\r\n";
result += openpgp_encoding_armor_addheader();
result += openpgp_encoding_base64_encode(data);
result += "\r\n="+getCheckSum(data)+"\r\n";
result += "-----END PGP MESSAGE-----\r\n";
break;
case 4:
result += "-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n";
result += openpgp_encoding_armor_addheader();
result += openpgp_encoding_base64_encode(data);
result += "\r\n="+getCheckSum(data)+"\r\n";
result += "-----END PGP PUBLIC KEY BLOCK-----\r\n\r\n";
break;
case 5:
result += "-----BEGIN PGP PRIVATE KEY BLOCK-----\r\n";
result += openpgp_encoding_armor_addheader();
result += openpgp_encoding_base64_encode(data);
result += "\r\n="+getCheckSum(data)+"\r\n";
result += "-----END PGP PRIVATE KEY BLOCK-----\r\n";
break;
}
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 openpgp_encoding_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 &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+1)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+2)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+3)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+4)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+5)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+6)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+7)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+8)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+9)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+10)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+11)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+12)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+13)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+14)) & 0xff];
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index+15)) & 0xff];
index += 16;
}
for(var j = index; j &lt; input.length; j++) {
crc = (crc &lt;&lt; 8) ^ crc_table[((crc >> 16) ^ input.charCodeAt(index++)) & 0xff]
}
return crc & 0xffffff;
}
</code></pre>
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