231 lines
11 KiB
HTML
231 lines
11 KiB
HTML
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<title>JSDoc: Source: type/s2k.js</title>
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<h1 class="page-title">Source: 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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* Implementation of the String-to-key specifier ({@link http://tools.ietf.org/html/rfc4880#section-3.7|RFC4880 3.7})<br/>
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* <br/>
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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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* @requires crypto
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* @requires enums
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* @requires util
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* @module type/s2k
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*/
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module.exports = S2K;
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var enums = require('../enums.js'),
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util = require('../util.js'),
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crypto = require('../crypto');
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/**
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* @constructor
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*/
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function S2K() {
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/** @type {module:enums.hash} */
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this.algorithm = 'sha256';
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/** @type {module:enums.s2k} */
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this.type = 'iterated';
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this.c = 96;
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/** Eight bytes of salt in a binary string.
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* @type {String}
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*/
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this.salt = crypto.random.getRandomBytes(8);
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}
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S2K.prototype.get_count = function () {
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// Exponent bias, defined in RFC4880
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var expbias = 6;
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return (16 + (this.c & 15)) << ((this.c >> 4) + expbias);
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};
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/**
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* Parsing function for a string-to-key specifier ({@link http://tools.ietf.org/html/rfc4880#section-3.7|RFC 4880 3.7}).
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* @param {String} input Payload of string-to-key specifier
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* @return {Integer} Actual length of the object
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*/
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S2K.prototype.read = function (bytes) {
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var i = 0;
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this.type = enums.read(enums.s2k, bytes.charCodeAt(i++));
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this.algorithm = enums.read(enums.hash, bytes.charCodeAt(i++));
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switch (this.type) {
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case 'simple':
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break;
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case 'salted':
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this.salt = bytes.substr(i, 8);
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i += 8;
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break;
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case 'iterated':
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this.salt = bytes.substr(i, 8);
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i += 8;
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// Octet 10: count, a one-octet, coded value
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this.c = bytes.charCodeAt(i++);
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break;
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case 'gnu':
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if (bytes.substr(i, 3) == "GNU") {
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i += 3; // GNU
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var gnuExtType = 1000 + bytes.charCodeAt(i++);
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if (gnuExtType == 1001) {
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this.type = gnuExtType;
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// GnuPG extension mode 1001 -- don't write secret key at all
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} else {
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throw new Error("Unknown s2k gnu protection mode.");
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}
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} else {
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throw new Error("Unknown s2k type.");
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}
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break;
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default:
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throw new Error("Unknown s2k type.");
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}
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return i;
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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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S2K.prototype.write = function () {
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var bytes = String.fromCharCode(enums.write(enums.s2k, this.type));
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bytes += String.fromCharCode(enums.write(enums.hash, this.algorithm));
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switch (this.type) {
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case 'simple':
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break;
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case 'salted':
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bytes += this.salt;
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break;
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case 'iterated':
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bytes += this.salt;
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bytes += String.fromCharCode(this.c);
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break;
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}
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return bytes;
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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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S2K.prototype.produce_key = function (passphrase, numBytes) {
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passphrase = util.encode_utf8(passphrase);
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function round(prefix, s2k) {
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var algorithm = enums.write(enums.hash, s2k.algorithm);
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switch (s2k.type) {
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case 'simple':
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return crypto.hash.digest(algorithm, prefix + passphrase);
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case 'salted':
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return crypto.hash.digest(algorithm,
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prefix + s2k.salt + passphrase);
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case 'iterated':
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var isp = [],
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count = s2k.get_count();
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data = s2k.salt + passphrase;
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while (isp.length * data.length < count)
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isp.push(data);
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isp = isp.join('');
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if (isp.length > count)
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isp = isp.substr(0, count);
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return crypto.hash.digest(algorithm, prefix + isp);
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}
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}
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var result = '',
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prefix = '';
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while (result.length <= numBytes) {
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result += round(prefix, this);
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prefix += String.fromCharCode(0);
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}
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return result.substr(0, numBytes);
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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 href="public_key.html">crypto/public_key</a></li><li><a href="dsa.html">crypto/public_key/dsa</a></li><li><a href="elgamal.html">crypto/public_key/elgamal</a></li><li><a href="jsbn.html">crypto/public_key/jsbn</a></li><li><a href="rsa.html">crypto/public_key/rsa</a></li><li><a href="random.html">crypto/random</a></li><li><a href="signature.html">crypto/signature</a></li><li><a href="armor.html">encoding/armor</a></li><li><a href="base64.html">encoding/base64</a></li><li><a href="module-enums.html">enums</a></li><li><a href="module-key.html">key</a></li><li><a href="module-keyring.html">keyring</a></li><li><a href="keyring.html">keyring/keyring</a></li><li><a href="localstore.html">keyring/localstore</a></li><li><a href="module-message.html">message</a></li><li><a href="module-openpgp.html">openpgp</a></li><li><a href="module-packet.html">packet</a></li><li><a href="compressed.html">packet/compressed</a></li><li><a href="literal.html">packet/literal</a></li><li><a href="marker.html">packet/marker</a></li><li><a href="one_pass_signature.html">packet/one_pass_signature</a></li><li><a href="packet.html">packet/packet</a></li><li><a href="packetlist.html">packet/packetlist</a></li><li><a href="public_key_.html">packet/public_key</a></li><li><a href="public_key_encrypted_session_key.html">packet/public_key_encrypted_session_key</a></li><li><a href="public_subkey.html">packet/public_subkey</a></li><li><a href="secret_key.html">packet/secret_key</a></li><li><a href="secret_subkey.html">packet/secret_subkey</a></li><li><a href="signature_.html">packet/signature</a></li><li><a href="sym_encrypted_integrity_protected.html">packet/sym_encrypted_integrity_protected</a></li><li><a href="sym_encrypted_session_key.html">packet/sym_encrypted_session_key</a></li><li><a href="symmetrically_encrypted.html">packet/symmetrically_encrypted</a></li><li><a href="trust.html">packet/trust</a></li><li><a href="user_attribute.html">packet/user_attribute</a></li><li><a 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 href="one_pass_signature-OnePassSignature.html">packet/one_pass_signature~OnePassSignature</a></li><li><a href="packetlist-Packetlist.html">packet/packetlist~Packetlist</a></li><li><a href="public_key_encrypted_session_key-PublicKeyEncryptedSessionKey.html">packet/public_key_encrypted_session_key~PublicKeyEncryptedSessionKey</a></li><li><a href="public_key-PublicKey.html">packet/public_key~PublicKey</a></li><li><a href="public_subkey-PublicSubkey.html">packet/public_subkey~PublicSubkey</a></li><li><a href="secret_key-SecretKey.html">packet/secret_key~SecretKey</a></li><li><a href="secret_subkey-SecretSubkey.html">packet/secret_subkey~SecretSubkey</a></li><li><a href="signature-Signature.html">packet/signature~Signature</a></li><li><a href="sym_encrypted_integrity_protected-SymEncryptedIntegrityProtected.html">packet/sym_encrypted_integrity_protected~SymEncryptedIntegrityProtected</a></li><li><a href="sym_encrypted_session_key-SymEncryptedSessionKey.html">packet/sym_encrypted_session_key~SymEncryptedSessionKey</a></li><li><a href="symmetrically_encrypted-SymmetricallyEncrypted.html">packet/symmetrically_encrypted~SymmetricallyEncrypted</a></li><li><a href="trust-Trust.html">packet/trust~Trust</a></li><li><a href="user_attribute-UserAttribute.html">packet/user_attribute~UserAttribute</a></li><li><a href="userid-Userid.html">packet/userid~Userid</a></li><li><a href="keyid-Keyid.html">type/keyid~Keyid</a></li><li><a href="mpi-MPI.html">type/mpi~MPI</a></li><li><a href="s2k-S2K.html">type/s2k~S2K</a></li></ul>
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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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