196 lines
12 KiB
HTML
196 lines
12 KiB
HTML
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<title>JSDoc: Source: crypto/pkcs1.js</title>
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<h1 class="page-title">Source: crypto/pkcs1.js</h1>
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<section>
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<article>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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/**
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* PKCS1 encoding
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* @requires crypto/crypto
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* @requires crypto/hash
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* @requires crypto/public_key/jsbn
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* @requires crypto/random
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* @requires util
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* @module crypto/pkcs1
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*/
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/**
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* ASN1 object identifiers for hashes (See {@link http://tools.ietf.org/html/rfc4880#section-5.2.2})
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*/
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hash_headers = [];
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hash_headers[1] = [0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04,
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0x10
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];
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hash_headers[2] = [0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14];
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hash_headers[3] = [0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x24, 0x03, 0x02, 0x01, 0x05, 0x00, 0x04, 0x14];
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hash_headers[8] = [0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00,
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0x04, 0x20
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];
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hash_headers[9] = [0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00,
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0x04, 0x30
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];
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hash_headers[10] = [0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05,
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0x00, 0x04, 0x40
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];
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hash_headers[11] = [0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05,
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0x00, 0x04, 0x1C
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];
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var crypto = require('./crypto.js'),
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random = require('./random.js'),
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util = require('../util.js'),
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BigInteger = require('./public_key/jsbn.js'),
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hash = require('./hash');
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module.exports = {
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eme: {
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/**
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* create a EME-PKCS1-v1_5 padding (See {@link http://tools.ietf.org/html/rfc4880#section-13.1.1|RFC 4880 13.1.1})
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* @param {String} message message to be padded
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* @param {Integer} length Length to the resulting message
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* @return {String} EME-PKCS1 padded message
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*/
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encode: function(message, length) {
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if (message.length > length - 11)
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return -1;
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var result = "";
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result += String.fromCharCode(0);
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result += String.fromCharCode(2);
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for (var i = 0; i < length - message.length - 3; i++) {
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result += String.fromCharCode(random.getPseudoRandom(1, 255));
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}
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result += String.fromCharCode(0);
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result += message;
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return result;
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},
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/**
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* decodes a EME-PKCS1-v1_5 padding (See {@link http://tools.ietf.org/html/rfc4880#section-13.1.2|RFC 4880 13.1.2})
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* @param {String} message EME-PKCS1 padded message
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* @return {String} decoded message
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*/
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decode: function(message, len) {
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if (message.length < len)
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message = String.fromCharCode(0) + message;
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if (message.length < 12 || message.charCodeAt(0) !== 0 || message.charCodeAt(1) != 2)
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return -1;
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var i = 2;
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while (message.charCodeAt(i) !== 0 && message.length > i)
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i++;
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return message.substring(i + 1, message.length);
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}
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},
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emsa: {
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/**
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* create a EMSA-PKCS1-v1_5 padding (See {@link http://tools.ietf.org/html/rfc4880#section-13.1.3|RFC 4880 13.1.3})
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* @param {Integer} algo Hash algorithm type used
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* @param {String} data Data to be hashed
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* @param {Integer} keylength Key size of the public mpi in bytes
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* @returns {String} Hashcode with pkcs1padding as string
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*/
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encode: function(algo, data, keylength) {
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var data2 = "";
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data2 += String.fromCharCode(0x00);
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data2 += String.fromCharCode(0x01);
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var i;
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for (i = 0; i < (keylength - hash_headers[algo].length - 3 -
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hash.getHashByteLength(algo)); i++)
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data2 += String.fromCharCode(0xff);
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data2 += String.fromCharCode(0x00);
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for (i = 0; i < hash_headers[algo].length; i++)
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data2 += String.fromCharCode(hash_headers[algo][i]);
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data2 += hash.digest(algo, data);
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return new BigInteger(util.hexstrdump(data2), 16);
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},
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/**
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* 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})
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* @param {String} data Hash in pkcs1 encoding
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* @returns {String} The hash as string
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*/
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decode: function(algo, data) {
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var i = 0;
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if (data.charCodeAt(0) === 0) i++;
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else if (data.charCodeAt(0) != 1) return -1;
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else i++;
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while (data.charCodeAt(i) == 0xFF) i++;
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if (data.charCodeAt(i++) !== 0) return -1;
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var j = 0;
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for (j = 0; j < hash_headers[algo].length && j + i < data.length; j++) {
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if (data.charCodeAt(j + i) != hash_headers[algo][j]) return -1;
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}
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i += j;
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if (data.substring(i).length < hash.getHashByteLength(algo)) return -1;
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return data.substring(i);
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}
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}
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};
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</code></pre>
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</article>
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</section>
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<h2><a href="index.html">Index</a></h2><h3>Modules</h3><ul><li><a href="module-cleartext.html">cleartext</a></li><li><a href="module-config.html">config</a></li><li><a href="config.html">config/config</a></li><li><a href="localStorage.html">config/localStorage</a></li><li><a href="module-crypto.html">crypto</a></li><li><a href="cfb.html">crypto/cfb</a></li><li><a href="cipher.html">crypto/cipher</a></li><li><a href="aes.html">crypto/cipher/aes</a></li><li><a href="blowfish.html">crypto/cipher/blowfish</a></li><li><a href="cast5.html">crypto/cipher/cast5</a></li><li><a href="des.html">crypto/cipher/des</a></li><li><a href="twofish.html">crypto/cipher/twofish</a></li><li><a href="crypto.html">crypto/crypto</a></li><li><a href="hash.html">crypto/hash</a></li><li><a href="md5.html">crypto/hash/md5</a></li><li><a href="ripe-md.html">crypto/hash/ripe-md</a></li><li><a href="sha.html">crypto/hash/sha</a></li><li><a href="pkcs1.html">crypto/pkcs1</a></li><li><a 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href="userid.html">packet/userid</a></li><li><a href="keyid.html">type/keyid</a></li><li><a href="mpi.html">type/mpi</a></li><li><a href="s2k.html">type/s2k</a></li><li><a href="module-util.html">util</a></li></ul><h3>Classes</h3><ul><li><a href="JXG.Util.html">JXG.Util</a></li><li><a href="module-cleartext-CleartextMessage.html">cleartext~CleartextMessage</a></li><li><a href="localStorage-LocalStorage.html">config/localStorage~LocalStorage</a></li><li><a href="keyring-Keyring.html">keyring/keyring~Keyring</a></li><li><a href="module-key-Key.html">key~Key</a></li><li><a href="module-key-SubKey.html">key~SubKey</a></li><li><a href="module-key-User.html">key~User</a></li><li><a href="module-message-Message.html">message~Message</a></li><li><a href="compressed-Compressed.html">packet/compressed~Compressed</a></li><li><a href="literal-Literal.html">packet/literal~Literal</a></li><li><a href="marker-Marker.html">packet/marker~Marker</a></li><li><a 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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.2</a> on Fri Jan 10 2014 09:39:09 GMT-0800 (PST)
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