190 lines
11 KiB
HTML
190 lines
11 KiB
HTML
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<title>JSDoc: Source: type/openpgp.type.s2k.js</title>
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<h1 class="page-title">Source: type/openpgp.type.s2k.js</h1>
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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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* @class
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* @classdesc Implementation of the String-to-key specifier (RFC4880 3.7)
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* String-to-key (S2K) specifiers are used to convert passphrase strings
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into symmetric-key encryption/decryption keys. They are used in two
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places, currently: to encrypt the secret part of private keys in the
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private keyring, and to convert passphrases to encryption keys for
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symmetrically encrypted messages.
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*/
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function openpgp_type_s2k() {
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/**
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* Parsing function for a string-to-key specifier (RFC 4880 3.7).
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* @param {String} input Payload of string-to-key specifier
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* @param {Integer} position Position to start reading from the input string
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* @return {openpgp_type_s2k} Object representation
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*/
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function read(input, position) {
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var mypos = position;
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this.type = input[mypos++].charCodeAt();
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switch (this.type) {
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case 0: // Simple S2K
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// Octet 1: hash algorithm
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this.hashAlgorithm = input[mypos++].charCodeAt();
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this.s2kLength = 1;
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break;
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case 1: // Salted S2K
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// Octet 1: hash algorithm
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this.hashAlgorithm = input[mypos++].charCodeAt();
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// Octets 2-9: 8-octet salt value
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this.saltValue = input.substring(mypos, mypos+8);
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mypos += 8;
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this.s2kLength = 9;
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break;
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case 3: // Iterated and Salted S2K
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// Octet 1: hash algorithm
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this.hashAlgorithm = input[mypos++].charCodeAt();
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// Octets 2-9: 8-octet salt value
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this.saltValue = input.substring(mypos, mypos+8);
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mypos += 8;
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// Octet 10: count, a one-octet, coded value
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this.EXPBIAS = 6;
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var c = input[mypos++].charCodeAt();
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this.count = (16 + (c & 15)) << ((c >> 4) + this.EXPBIAS);
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this.s2kLength = 10;
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break;
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case 101:
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if(input.substring(mypos+1, mypos+4) == "GNU") {
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this.hashAlgorithm = input[mypos++].charCodeAt();
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mypos += 3; // GNU
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var gnuExtType = 1000 + input[mypos++].charCodeAt();
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if(gnuExtType == 1001) {
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this.type = gnuExtType;
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this.s2kLength = 5;
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// GnuPG extension mode 1001 -- don't write secret key at all
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} else {
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util.print_error("unknown s2k gnu protection mode! "+this.type);
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}
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} else {
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util.print_error("unknown s2k type! "+this.type);
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}
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break;
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case 2: // Reserved value
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default:
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util.print_error("unknown s2k type! "+this.type);
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break;
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}
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return this;
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}
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/**
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* writes an s2k hash based on the inputs.
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* @return {String} Produced key of hashAlgorithm hash length
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*/
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function write(type, hash, passphrase, salt, c){
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this.type = type;
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if(this.type == 3){this.saltValue = salt;
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this.hashAlgorithm = hash;
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this.count = (16 + (c & 15)) << ((c >> 4) + 6);
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this.s2kLength = 10;
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}
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return this.produce_key(passphrase);
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}
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/**
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* Produces a key using the specified passphrase and the defined
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* hashAlgorithm
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* @param {String} passphrase Passphrase containing user input
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* @return {String} Produced key with a length corresponding to
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* hashAlgorithm hash length
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*/
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function produce_key(passphrase, numBytes) {
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if (this.type == 0) {
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return openpgp_crypto_hashData(this.hashAlgorithm,passphrase);
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} else if (this.type == 1) {
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return openpgp_crypto_hashData(this.hashAlgorithm,this.saltValue+passphrase);
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} else if (this.type == 3) {
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var isp = [];
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isp[0] = this.saltValue+passphrase;
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while (isp.length*(this.saltValue+passphrase).length < this.count)
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isp.push(this.saltValue+passphrase);
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isp = isp.join('');
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if (isp.length > this.count)
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isp = isp.substr(0, this.count);
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if(numBytes && (numBytes == 24 || numBytes == 32)){ //This if accounts for RFC 4880 3.7.1.1 -- If hash size is greater than block size, use leftmost bits. If blocksize larger than hash size, we need to rehash isp and prepend with 0.
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var key = openpgp_crypto_hashData(this.hashAlgorithm,isp);
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return key + openpgp_crypto_hashData(this.hashAlgorithm,String.fromCharCode(0)+isp);
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}
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return openpgp_crypto_hashData(this.hashAlgorithm,isp);
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} else return null;
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}
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this.read = read;
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this.write = write;
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this.produce_key = produce_key;
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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>Classes</h3><ul><li><a href="_openpgp_packet.html">_openpgp_packet</a></li><li><a href="JXG.Util.html">Util</a></li><li><a href="openpgp.html">openpgp</a></li><li><a href="openpgp_config.html">openpgp_config</a></li><li><a href="openpgp_keyring.html">openpgp_keyring</a></li><li><a href="openpgp_msg_message.html">openpgp_msg_message</a></li><li><a href="openpgp_msg_privatekey.html">openpgp_msg_privatekey</a></li><li><a href="openpgp_msg_publickey.html">openpgp_msg_publickey</a></li><li><a href="openpgp_packet_compressed.html">openpgp_packet_compressed</a></li><li><a href="openpgp_packet_encrypteddata.html">openpgp_packet_encrypteddata</a></li><li><a href="openpgp_packet_encryptedintegrityprotecteddata.html">openpgp_packet_encryptedintegrityprotecteddata</a></li><li><a href="openpgp_packet_encryptedsessionkey.html">openpgp_packet_encryptedsessionkey</a></li><li><a href="openpgp_packet_keymaterial.html">openpgp_packet_keymaterial</a></li><li><a href="openpgp_packet_literaldata.html">openpgp_packet_literaldata</a></li><li><a href="openpgp_packet_marker.html">openpgp_packet_marker</a></li><li><a href="openpgp_packet_modificationdetectioncode.html">openpgp_packet_modificationdetectioncode</a></li><li><a href="openpgp_packet_onepasssignature.html">openpgp_packet_onepasssignature</a></li><li><a href="openpgp_packet_signature.html">openpgp_packet_signature</a></li><li><a href="openpgp_packet_userattribute.html">openpgp_packet_userattribute</a></li><li><a href="openpgp_packet_userid.html">openpgp_packet_userid</a></li><li><a href="openpgp_type_keyid.html">openpgp_type_keyid</a></li><li><a href="openpgp_type_mpi.html">openpgp_type_mpi</a></li><li><a href="openpgp_type_s2k.html">openpgp_type_s2k</a></li></ul><h3>Global</h3><ul><li><a href="global.html#bin2str">bin2str</a></li><li><a href="global.html#calc_checksum">calc_checksum</a></li><li><a href="global.html#crc_table">crc_table</a></li><li><a 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href="global.html#openpgp_crypto_symmetricDecrypt">openpgp_crypto_symmetricDecrypt</a></li><li><a href="global.html#openpgp_crypto_symmetricEncrypt">openpgp_crypto_symmetricEncrypt</a></li><li><a href="global.html#openpgp_crypto_verifySignature">openpgp_crypto_verifySignature</a></li><li><a href="global.html#openpgp_encoding_armor">openpgp_encoding_armor</a></li><li><a href="global.html#openpgp_encoding_armor_addheader">openpgp_encoding_armor_addheader</a></li><li><a href="global.html#openpgp_encoding_base64_decode">openpgp_encoding_base64_decode</a></li><li><a href="global.html#openpgp_encoding_base64_encode">openpgp_encoding_base64_encode</a></li><li><a href="global.html#openpgp_encoding_deArmor">openpgp_encoding_deArmor</a></li><li><a href="global.html#openpgp_encoding_eme_pkcs1_decode">openpgp_encoding_eme_pkcs1_decode</a></li><li><a href="global.html#openpgp_encoding_eme_pkcs1_encode">openpgp_encoding_eme_pkcs1_encode</a></li><li><a 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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.0-dev</a> on Fri Apr 12 2013 14:20:33 GMT+0200 (CEST)
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