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fork-openpgpjs/doc/pkcs1.js.html
Robert Nelson 3680695a69 Implement node.js support and cleanup source tree. 
Rename resources to dist.

Eliminate keyring bundle and expose keyring class in openpgp module.

Add mochaTest grunt task to run node server-side tests.

Add node_pack grunt task to create npm package into dist and install it for testing.

Add node_store config property which specifies location of localStorage emulation when using node.

Add repository info to package.json.

Move util.js to src directory from util since it is the only file there.

Rename class properties in openpgp to the new class names.
2014-01-09 02:29:30 -08:00

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<h1 class="page-title">Source: crypto/pkcs1.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
/**
* PKCS1 encoding
* @requires crypto/crypto
* @requires crypto/hash
* @requires crypto/public_key/jsbn
* @requires crypto/random
* @requires util
* @module crypto/pkcs1
*/
/**
* ASN1 object identifiers for hashes (See {@link http://tools.ietf.org/html/rfc4880#section-5.2.2})
*/
hash_headers = [];
hash_headers[1] = [0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04,
0x10
];
hash_headers[2] = [0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14];
hash_headers[3] = [0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x24, 0x03, 0x02, 0x01, 0x05, 0x00, 0x04, 0x14];
hash_headers[8] = [0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00,
0x04, 0x20
];
hash_headers[9] = [0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00,
0x04, 0x30
];
hash_headers[10] = [0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05,
0x00, 0x04, 0x40
];
hash_headers[11] = [0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05,
0x00, 0x04, 0x1C
];
var crypto = require('./crypto.js'),
random = require('./random.js'),
util = require('../util.js'),
BigInteger = require('./public_key/jsbn.js'),
hash = require('./hash');
module.exports = {
eme: {
/**
* create a EME-PKCS1-v1_5 padding (See {@link http://tools.ietf.org/html/rfc4880#section-13.1.1|RFC 4880 13.1.1})
* @param {String} message message to be padded
* @param {Integer} length Length to the resulting message
* @return {String} EME-PKCS1 padded message
*/
encode: function(message, length) {
if (message.length > length - 11)
return -1;
var result = "";
result += String.fromCharCode(0);
result += String.fromCharCode(2);
for (var i = 0; i &lt; length - message.length - 3; i++) {
result += String.fromCharCode(random.getPseudoRandom(1, 255));
}
result += String.fromCharCode(0);
result += message;
return result;
},
/**
* decodes a EME-PKCS1-v1_5 padding (See {@link http://tools.ietf.org/html/rfc4880#section-13.1.2|RFC 4880 13.1.2})
* @param {String} message EME-PKCS1 padded message
* @return {String} decoded message
*/
decode: function(message, len) {
if (message.length &lt; len)
message = String.fromCharCode(0) + message;
if (message.length &lt; 12 || message.charCodeAt(0) !== 0 || message.charCodeAt(1) != 2)
return -1;
var i = 2;
while (message.charCodeAt(i) !== 0 && message.length > i)
i++;
return message.substring(i + 1, message.length);
}
},
emsa: {
/**
* create a EMSA-PKCS1-v1_5 padding (See {@link http://tools.ietf.org/html/rfc4880#section-13.1.3|RFC 4880 13.1.3})
* @param {Integer} algo Hash algorithm type used
* @param {String} data Data to be hashed
* @param {Integer} keylength Key size of the public mpi in bytes
* @returns {String} Hashcode with pkcs1padding as string
*/
encode: function(algo, data, keylength) {
var data2 = "";
data2 += String.fromCharCode(0x00);
data2 += String.fromCharCode(0x01);
var i;
for (i = 0; i &lt; (keylength - hash_headers[algo].length - 3 -
hash.getHashByteLength(algo)); i++)
data2 += String.fromCharCode(0xff);
data2 += String.fromCharCode(0x00);
for (i = 0; i &lt; hash_headers[algo].length; i++)
data2 += String.fromCharCode(hash_headers[algo][i]);
data2 += hash.digest(algo, data);
return new BigInteger(util.hexstrdump(data2), 16);
},
/**
* extract the hash out of an EMSA-PKCS1-v1.5 padding (See {@link http://tools.ietf.org/html/rfc4880#section-13.1.3|RFC 4880 13.1.3})
* @param {String} data Hash in pkcs1 encoding
* @returns {String} The hash as string
*/
decode: function(algo, data) {
var i = 0;
if (data.charCodeAt(0) === 0) i++;
else if (data.charCodeAt(0) != 1) return -1;
else i++;
while (data.charCodeAt(i) == 0xFF) i++;
if (data.charCodeAt(i++) !== 0) return -1;
var j = 0;
for (j = 0; j &lt; hash_headers[algo].length && j + i &lt; data.length; j++) {
if (data.charCodeAt(j + i) != hash_headers[algo][j]) return -1;
}
i += j;
if (data.substring(i).length &lt; hash.getHashByteLength(algo)) return -1;
return data.substring(i);
}
}
};
</code></pre>
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