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gPass : global Password.
Copyright (C) 2013 Grégory Soutadé
Licence : GPL v3
See http://indefero.soutade.fr/p/gpass/ for further information

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gPass : global password
=======================
Introduction
------------
Everyday we have a lot of passwords to manage corresponding to a lot of accounts we use. It's hard to remain all of these, moreover if we don't use it often. So, what we most people do is to generate only a subset of passwords easy to remain. This implies two common errors :
* Password are not very strong
* We use them for multiple accounts
The best way to avoid these errors is to have a unique strong password for each account. gPass helps to reach this goal : you keep a subset of passwords and for each login/password tuple you chose, gPass returns the real password by querying a password server.
To have a high level of security, all information is stored encrypted. The decryption is done on the fly when it's needed and only with user input. So, a hacker can get your password database, it will not be able to see any information !
This addon is like [last pass](https://lastpass.com/) one, but I wanted it to be open source and home hostable. Moreover, with gPass, you can have multiple master key !
Usage
-----
The first thing to do is to populate your database (from your/a password server) with login/password/master key values. If you want to make strong password, there is a password generator. After that, configure your addon in addons -> gPass -> preferences to point to your password server.
When you're in a login form and you want to use gPass. Type your login and fill "@@masterkey" in password field. Then, submit and password willll automatically be replaced by the one in the database (after decryption).
Technique
---------
The only two columns in database are "login" and "password".
login is compounded by "@@domain;login" encrypted with AES 256
password encrypted with AES 256
The key that encrypt these fields is sha256(masterkey)
Licence
-------
All the code is licenced under GPL v3. Source code is available [here](http://indefero.soutade.fr/p/gpass).

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possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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/*
* jsaes version 0.1 - Copyright 2006 B. Poettering
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*/
/*
* http://point-at-infinity.org/jsaes/
*
* This is a javascript implementation of the AES block cipher. Key lengths
* of 128, 192 and 256 bits are supported.
*
* The well-functioning of the encryption/decryption routines has been
* verified for different key lengths with the test vectors given in
* FIPS-197, Appendix C.
*
* The following code example enciphers the plaintext block '00 11 22 .. EE FF'
* with the 256 bit key '00 01 02 .. 1E 1F'.
*
* AES_Init();
*
* var block = new Array(16);
* for(var i = 0; i < 16; i++)
* block[i] = 0x11 * i;
*
* var key = new Array(32);
* for(var i = 0; i < 32; i++)
* key[i] = i;
*
* AES_ExpandKey(key);
* AES_Encrypt(block, key);
*
* AES_Done();
*
* Report bugs to: jsaes AT point-at-infinity.org
*
*/
/******************************************************************************/
/*
AES_Init: initialize the tables needed at runtime. Call this function
before the (first) key expansion.
*/
function AES_Init() {
AES_Sbox_Inv = new Array(256);
for(var i = 0; i < 256; i++)
AES_Sbox_Inv[AES_Sbox[i]] = i;
AES_ShiftRowTab_Inv = new Array(16);
for(var i = 0; i < 16; i++)
AES_ShiftRowTab_Inv[AES_ShiftRowTab[i]] = i;
AES_xtime = new Array(256);
for(var i = 0; i < 128; i++) {
AES_xtime[i] = i << 1;
AES_xtime[128 + i] = (i << 1) ^ 0x1b;
}
}
/*
AES_Done: release memory reserved by AES_Init. Call this function after
the last encryption/decryption operation.
*/
function AES_Done() {
delete AES_Sbox_Inv;
delete AES_ShiftRowTab_Inv;
delete AES_xtime;
}
/*
AES_ExpandKey: expand a cipher key. Depending on the desired encryption
strength of 128, 192 or 256 bits 'key' has to be a byte array of length
16, 24 or 32, respectively. The key expansion is done "in place", meaning
that the array 'key' is modified.
*/
function AES_ExpandKey(key) {
var kl = key.length, ks, Rcon = 1;
switch (kl) {
case 16: ks = 16 * (10 + 1); break;
case 24: ks = 16 * (12 + 1); break;
case 32: ks = 16 * (14 + 1); break;
default:
alert("AES_ExpandKey: Only key lengths of 16, 24 or 32 bytes allowed!");
}
for(var i = kl; i < ks; i += 4) {
var temp = key.slice(i - 4, i);
if (i % kl == 0) {
temp = new Array(AES_Sbox[temp[1]] ^ Rcon, AES_Sbox[temp[2]],
AES_Sbox[temp[3]], AES_Sbox[temp[0]]);
if ((Rcon <<= 1) >= 256)
Rcon ^= 0x11b;
}
else if ((kl > 24) && (i % kl == 16))
temp = new Array(AES_Sbox[temp[0]], AES_Sbox[temp[1]],
AES_Sbox[temp[2]], AES_Sbox[temp[3]]);
for(var j = 0; j < 4; j++)
key[i + j] = key[i + j - kl] ^ temp[j];
}
}
/*
AES_Encrypt: encrypt the 16 byte array 'block' with the previously
expanded key 'key'.
*/
function AES_Encrypt(block, key) {
var l = key.length;
AES_AddRoundKey(block, key.slice(0, 16));
for(var i = 16; i < l - 16; i += 16) {
AES_SubBytes(block, AES_Sbox);
AES_ShiftRows(block, AES_ShiftRowTab);
AES_MixColumns(block);
AES_AddRoundKey(block, key.slice(i, i + 16));
}
AES_SubBytes(block, AES_Sbox);
AES_ShiftRows(block, AES_ShiftRowTab);
AES_AddRoundKey(block, key.slice(i, l));
}
/*
AES_Decrypt: decrypt the 16 byte array 'block' with the previously
expanded key 'key'.
*/
function AES_Decrypt(block, key) {
var l = key.length;
AES_AddRoundKey(block, key.slice(l - 16, l));
AES_ShiftRows(block, AES_ShiftRowTab_Inv);
AES_SubBytes(block, AES_Sbox_Inv);
for(var i = l - 32; i >= 16; i -= 16) {
AES_AddRoundKey(block, key.slice(i, i + 16));
AES_MixColumns_Inv(block);
AES_ShiftRows(block, AES_ShiftRowTab_Inv);
AES_SubBytes(block, AES_Sbox_Inv);
}
AES_AddRoundKey(block, key.slice(0, 16));
}
/******************************************************************************/
/* The following lookup tables and functions are for internal use only! */
AES_Sbox = new Array(99,124,119,123,242,107,111,197,48,1,103,43,254,215,171,
118,202,130,201,125,250,89,71,240,173,212,162,175,156,164,114,192,183,253,
147,38,54,63,247,204,52,165,229,241,113,216,49,21,4,199,35,195,24,150,5,154,
7,18,128,226,235,39,178,117,9,131,44,26,27,110,90,160,82,59,214,179,41,227,
47,132,83,209,0,237,32,252,177,91,106,203,190,57,74,76,88,207,208,239,170,
251,67,77,51,133,69,249,2,127,80,60,159,168,81,163,64,143,146,157,56,245,
188,182,218,33,16,255,243,210,205,12,19,236,95,151,68,23,196,167,126,61,
100,93,25,115,96,129,79,220,34,42,144,136,70,238,184,20,222,94,11,219,224,
50,58,10,73,6,36,92,194,211,172,98,145,149,228,121,231,200,55,109,141,213,
78,169,108,86,244,234,101,122,174,8,186,120,37,46,28,166,180,198,232,221,
116,31,75,189,139,138,112,62,181,102,72,3,246,14,97,53,87,185,134,193,29,
158,225,248,152,17,105,217,142,148,155,30,135,233,206,85,40,223,140,161,
137,13,191,230,66,104,65,153,45,15,176,84,187,22);
AES_ShiftRowTab = new Array(0,5,10,15,4,9,14,3,8,13,2,7,12,1,6,11);
function AES_SubBytes(state, sbox) {
for(var i = 0; i < 16; i++)
state[i] = sbox[state[i]];
}
function AES_AddRoundKey(state, rkey) {
for(var i = 0; i < 16; i++)
state[i] ^= rkey[i];
}
function AES_ShiftRows(state, shifttab) {
var h = new Array().concat(state);
for(var i = 0; i < 16; i++)
state[i] = h[shifttab[i]];
}
function AES_MixColumns(state) {
for(var i = 0; i < 16; i += 4) {
var s0 = state[i + 0], s1 = state[i + 1];
var s2 = state[i + 2], s3 = state[i + 3];
var h = s0 ^ s1 ^ s2 ^ s3;
state[i + 0] ^= h ^ AES_xtime[s0 ^ s1];
state[i + 1] ^= h ^ AES_xtime[s1 ^ s2];
state[i + 2] ^= h ^ AES_xtime[s2 ^ s3];
state[i + 3] ^= h ^ AES_xtime[s3 ^ s0];
}
}
function AES_MixColumns_Inv(state) {
for(var i = 0; i < 16; i += 4) {
var s0 = state[i + 0], s1 = state[i + 1];
var s2 = state[i + 2], s3 = state[i + 3];
var h = s0 ^ s1 ^ s2 ^ s3;
var xh = AES_xtime[h];
var h1 = AES_xtime[AES_xtime[xh ^ s0 ^ s2]] ^ h;
var h2 = AES_xtime[AES_xtime[xh ^ s1 ^ s3]] ^ h;
state[i + 0] ^= h1 ^ AES_xtime[s0 ^ s1];
state[i + 1] ^= h2 ^ AES_xtime[s1 ^ s2];
state[i + 2] ^= h1 ^ AES_xtime[s2 ^ s3];
state[i + 3] ^= h2 ^ AES_xtime[s3 ^ s0];
}
}
function bin2String (array) {
var result = "";
for (var i = 0; i < array.length; i++) {
result += String.fromCharCode(parseInt(array[i], 2));
}
return result;
}
function string2Bin (str) {
var result = [];
for (var i = 0; i < str.length; i++) {
result.push(str.charCodeAt(i));
}
while ((result.length % 16))
result.push(0);
return result;
}
function bin2String (array) {
return String.fromCharCode.apply(String, array);
}
// http://osama-oransa.blogspot.fr/2012/03/using-aes-encrypting-in-java-script.html
exports.aes = {
init : function (myKey){
AES_Init();
var key = string2Bin(myKey);
AES_ExpandKey(key);
return key;
},
encrypt : function ( inputStr,key ) {
var block = string2Bin(inputStr);
AES_Encrypt(block, key);
var data=bin2String(block);
return data;
},
decrypt : function ( inputStr,key ) {
block = string2Bin(inputStr);
AES_Decrypt(block, key);
var data=bin2String(block);
return data;
},
encryptLongString : function( myString,key ) {
if(myString.length>16){
var data='';
for(var i=0;i<myString.length;i=i+16){
data+=this.encrypt(myString.substr(i,16),key);
}
return data;
}else{
return this.encrypt(myString,key);
}
},
decryptLongString : function ( myString,key ) {
if(myString.length>16){
var data='';
for(var i=0;i<myString.length;i=i+16){
data+=this.decrypt(myString.substr(i,16),key);
}
return data;
}else{
return this.decrypt(myString,key);
}
},
finish : function(){
AES_Done();
},
};

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/**
* @license jahashtable, a JavaScript implementation of a hash table. It creates a single constructor function called
* Hashtable in the global scope.
*
* http://www.timdown.co.uk/jshashtable/
* Copyright 2013 Tim Down.
* Version: 3.0
* Build date: 17 July 2013
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var Hashtable = (function(UNDEFINED) {
var FUNCTION = "function", STRING = "string", UNDEF = "undefined";
// Require Array.prototype.splice, Object.prototype.hasOwnProperty and encodeURIComponent. In environments not
// having these (e.g. IE <= 5), we bail out now and leave Hashtable null.
if (typeof encodeURIComponent == UNDEF ||
Array.prototype.splice === UNDEFINED ||
Object.prototype.hasOwnProperty === UNDEFINED) {
return null;
}
function toStr(obj) {
return (typeof obj == STRING) ? obj : "" + obj;
}
function hashObject(obj) {
var hashCode;
if (typeof obj == STRING) {
return obj;
} else if (typeof obj.hashCode == FUNCTION) {
// Check the hashCode method really has returned a string
hashCode = obj.hashCode();
return (typeof hashCode == STRING) ? hashCode : hashObject(hashCode);
} else {
return toStr(obj);
}
}
function merge(o1, o2) {
for (var i in o2) {
if (o2.hasOwnProperty(i)) {
o1[i] = o2[i];
}
}
}
function equals_fixedValueHasEquals(fixedValue, variableValue) {
return fixedValue.equals(variableValue);
}
function equals_fixedValueNoEquals(fixedValue, variableValue) {
return (typeof variableValue.equals == FUNCTION) ?
variableValue.equals(fixedValue) : (fixedValue === variableValue);
}
function createKeyValCheck(kvStr) {
return function(kv) {
if (kv === null) {
throw new Error("null is not a valid " + kvStr);
} else if (kv === UNDEFINED) {
throw new Error(kvStr + " must not be undefined");
}
};
}
var checkKey = createKeyValCheck("key"), checkValue = createKeyValCheck("value");
/*----------------------------------------------------------------------------------------------------------------*/
function Bucket(hash, firstKey, firstValue, equalityFunction) {
this[0] = hash;
this.entries = [];
this.addEntry(firstKey, firstValue);
if (equalityFunction !== null) {
this.getEqualityFunction = function() {
return equalityFunction;
};
}
}
var EXISTENCE = 0, ENTRY = 1, ENTRY_INDEX_AND_VALUE = 2;
function createBucketSearcher(mode) {
return function(key) {
var i = this.entries.length, entry, equals = this.getEqualityFunction(key);
while (i--) {
entry = this.entries[i];
if ( equals(key, entry[0]) ) {
switch (mode) {
case EXISTENCE:
return true;
case ENTRY:
return entry;
case ENTRY_INDEX_AND_VALUE:
return [ i, entry[1] ];
}
}
}
return false;
};
}
function createBucketLister(entryProperty) {
return function(aggregatedArr) {
var startIndex = aggregatedArr.length;
for (var i = 0, entries = this.entries, len = entries.length; i < len; ++i) {
aggregatedArr[startIndex + i] = entries[i][entryProperty];
}
};
}
Bucket.prototype = {
getEqualityFunction: function(searchValue) {
return (typeof searchValue.equals == FUNCTION) ? equals_fixedValueHasEquals : equals_fixedValueNoEquals;
},
getEntryForKey: createBucketSearcher(ENTRY),
getEntryAndIndexForKey: createBucketSearcher(ENTRY_INDEX_AND_VALUE),
removeEntryForKey: function(key) {
var result = this.getEntryAndIndexForKey(key);
if (result) {
this.entries.splice(result[0], 1);
return result[1];
}
return null;
},
addEntry: function(key, value) {
this.entries.push( [key, value] );
},
keys: createBucketLister(0),
values: createBucketLister(1),
getEntries: function(destEntries) {
var startIndex = destEntries.length;
for (var i = 0, entries = this.entries, len = entries.length; i < len; ++i) {
// Clone the entry stored in the bucket before adding to array
destEntries[startIndex + i] = entries[i].slice(0);
}
},
containsKey: createBucketSearcher(EXISTENCE),
containsValue: function(value) {
var entries = this.entries, i = entries.length;
while (i--) {
if ( value === entries[i][1] ) {
return true;
}
}
return false;
}
};
/*----------------------------------------------------------------------------------------------------------------*/
// Supporting functions for searching hashtable buckets
function searchBuckets(buckets, hash) {
var i = buckets.length, bucket;
while (i--) {
bucket = buckets[i];
if (hash === bucket[0]) {
return i;
}
}
return null;
}
function getBucketForHash(bucketsByHash, hash) {
var bucket = bucketsByHash[hash];
// Check that this is a genuine bucket and not something inherited from the bucketsByHash's prototype
return ( bucket && (bucket instanceof Bucket) ) ? bucket : null;
}
/*----------------------------------------------------------------------------------------------------------------*/
function Hashtable() {
var buckets = [];
var bucketsByHash = {};
var properties = {
replaceDuplicateKey: true,
hashCode: hashObject,
equals: null
};
var arg0 = arguments[0], arg1 = arguments[1];
if (arg1 !== UNDEFINED) {
properties.hashCode = arg0;
properties.equals = arg1;
} else if (arg0 !== UNDEFINED) {
merge(properties, arg0);
}
var hashCode = properties.hashCode, equals = properties.equals;
this.properties = properties;
this.put = function(key, value) {
checkKey(key);
checkValue(value);
var hash = hashCode(key), bucket, bucketEntry, oldValue = null;
// Check if a bucket exists for the bucket key
bucket = getBucketForHash(bucketsByHash, hash);
if (bucket) {
// Check this bucket to see if it already contains this key
bucketEntry = bucket.getEntryForKey(key);
if (bucketEntry) {
// This bucket entry is the current mapping of key to value, so replace the old value.
// Also, we optionally replace the key so that the latest key is stored.
if (properties.replaceDuplicateKey) {
bucketEntry[0] = key;
}
oldValue = bucketEntry[1];
bucketEntry[1] = value;
} else {
// The bucket does not contain an entry for this key, so add one
bucket.addEntry(key, value);
}
} else {
// No bucket exists for the key, so create one and put our key/value mapping in
bucket = new Bucket(hash, key, value, equals);
buckets.push(bucket);
bucketsByHash[hash] = bucket;
}
return oldValue;
};
this.get = function(key) {
checkKey(key);
var hash = hashCode(key);
// Check if a bucket exists for the bucket key
var bucket = getBucketForHash(bucketsByHash, hash);
if (bucket) {
// Check this bucket to see if it contains this key
var bucketEntry = bucket.getEntryForKey(key);
if (bucketEntry) {
// This bucket entry is the current mapping of key to value, so return the value.
return bucketEntry[1];
}
}
return null;
};
this.containsKey = function(key) {
checkKey(key);
var bucketKey = hashCode(key);
// Check if a bucket exists for the bucket key
var bucket = getBucketForHash(bucketsByHash, bucketKey);
return bucket ? bucket.containsKey(key) : false;
};
this.containsValue = function(value) {
checkValue(value);
var i = buckets.length;
while (i--) {
if (buckets[i].containsValue(value)) {
return true;
}
}
return false;
};
this.clear = function() {
buckets.length = 0;
bucketsByHash = {};
};
this.isEmpty = function() {
return !buckets.length;
};
var createBucketAggregator = function(bucketFuncName) {
return function() {
var aggregated = [], i = buckets.length;
while (i--) {
buckets[i][bucketFuncName](aggregated);
}
return aggregated;
};
};
this.keys = createBucketAggregator("keys");
this.values = createBucketAggregator("values");
this.entries = createBucketAggregator("getEntries");
this.remove = function(key) {
checkKey(key);
var hash = hashCode(key), bucketIndex, oldValue = null;
// Check if a bucket exists for the bucket key
var bucket = getBucketForHash(bucketsByHash, hash);
if (bucket) {
// Remove entry from this bucket for this key
oldValue = bucket.removeEntryForKey(key);
if (oldValue !== null) {
// Entry was removed, so check if bucket is empty
if (bucket.entries.length == 0) {
// Bucket is empty, so remove it from the bucket collections
bucketIndex = searchBuckets(buckets, hash);
buckets.splice(bucketIndex, 1);
delete bucketsByHash[hash];
}
}
}
return oldValue;
};
this.size = function() {
var total = 0, i = buckets.length;
while (i--) {
total += buckets[i].entries.length;
}
return total;
};
}
Hashtable.prototype = {
each: function(callback) {
var entries = this.entries(), i = entries.length, entry;
while (i--) {
entry = entries[i];
callback(entry[0], entry[1]);
}
},
equals: function(hashtable) {
var keys, key, val, count = this.size();
if (count == hashtable.size()) {
keys = this.keys();
while (count--) {
key = keys[count];
val = hashtable.get(key);
if (val === null || val !== this.get(key)) {
return false;
}
}
return true;
}
return false;
},
putAll: function(hashtable, conflictCallback) {
var entries = hashtable.entries();
var entry, key, value, thisValue, i = entries.length;
var hasConflictCallback = (typeof conflictCallback == FUNCTION);
while (i--) {
entry = entries[i];
key = entry[0];
value = entry[1];
// Check for a conflict. The default behaviour is to overwrite the value for an existing key
if ( hasConflictCallback && (thisValue = this.get(key)) ) {
value = conflictCallback(key, thisValue, value);
}
this.put(key, value);
}
},
clone: function() {
var clone = new Hashtable(this.properties);
clone.putAll(this);
return clone;
}
};
Hashtable.prototype.toQueryString = function() {
var entries = this.entries(), i = entries.length, entry;
var parts = [];
while (i--) {
entry = entries[i];
parts[i] = encodeURIComponent( toStr(entry[0]) ) + "=" + encodeURIComponent( toStr(entry[1]) );
}
return parts.join("&");
};
return Hashtable;
})();
exports.Hashtable = Hashtable;

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/*
* A JavaScript implementation of the SHA256 hash function.
*
* FILE: sha256.js
* VERSION: 0.8
* AUTHOR: Christoph Bichlmeier <informatik@zombiearena.de>
*
* NOTE: This version is not tested thoroughly!
*
* Copyright (c) 2003, Christoph Bichlmeier
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* ======================================================================
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* SHA256 logical functions */
function rotateRight(n,x) {
return ((x >>> n) | (x << (32 - n)));
}
function choice(x,y,z) {
return ((x & y) ^ (~x & z));
}
function majority(x,y,z) {
return ((x & y) ^ (x & z) ^ (y & z));
}
function sha256_Sigma0(x) {
return (rotateRight(2, x) ^ rotateRight(13, x) ^ rotateRight(22, x));
}
function sha256_Sigma1(x) {
return (rotateRight(6, x) ^ rotateRight(11, x) ^ rotateRight(25, x));
}
function sha256_sigma0(x) {
return (rotateRight(7, x) ^ rotateRight(18, x) ^ (x >>> 3));
}
function sha256_sigma1(x) {
return (rotateRight(17, x) ^ rotateRight(19, x) ^ (x >>> 10));
}
function sha256_expand(W, j) {
return (W[j&0x0f] += sha256_sigma1(W[(j+14)&0x0f]) + W[(j+9)&0x0f] +
sha256_sigma0(W[(j+1)&0x0f]));
}
/* Hash constant words K: */
var K256 = new Array(
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
);
/* global arrays */
var ihash, count, buffer;
var sha256_hex_digits = "0123456789abcdef";
/* Add 32-bit integers with 16-bit operations (bug in some JS-interpreters:
overflow) */
function safe_add(x, y)
{
var lsw = (x & 0xffff) + (y & 0xffff);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xffff);
}
/* Initialise the SHA256 computation */
function sha256_init() {
ihash = new Array(8);
count = new Array(2);
buffer = new Array(64);
count[0] = count[1] = 0;
ihash[0] = 0x6a09e667;
ihash[1] = 0xbb67ae85;
ihash[2] = 0x3c6ef372;
ihash[3] = 0xa54ff53a;
ihash[4] = 0x510e527f;
ihash[5] = 0x9b05688c;
ihash[6] = 0x1f83d9ab;
ihash[7] = 0x5be0cd19;
}
/* Transform a 512-bit message block */
function sha256_transform() {
var a, b, c, d, e, f, g, h, T1, T2;
var W = new Array(16);
/* Initialize registers with the previous intermediate value */
a = ihash[0];
b = ihash[1];
c = ihash[2];
d = ihash[3];
e = ihash[4];
f = ihash[5];
g = ihash[6];
h = ihash[7];
/* make 32-bit words */
for(var i=0; i<16; i++)
W[i] = ((buffer[(i<<2)+3]) | (buffer[(i<<2)+2] << 8) | (buffer[(i<<2)+1]
<< 16) | (buffer[i<<2] << 24));
for(var j=0; j<64; j++) {
T1 = h + sha256_Sigma1(e) + choice(e, f, g) + K256[j];