84 lines
2.7 KiB
JavaScript
84 lines
2.7 KiB
JavaScript
/*
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* passy.js - implementation of passy algorithm in javascript, by Stephen Waits
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*
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* The MIT License
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*
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* Copyright (c) 2010 Stephen Waits <steve@waits.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/*jslint onevar: true, undef: true, nomen: true, regexp: true, newcap: true, immed: true */
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/*
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* Given a "text" (i.e. "amazon.com") and a "secret" (i.e. "mypassword") return an
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* array of four Passy'fied passwords.
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*/
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var passy = function(text,secret)
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{
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/*
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* function to make a password out of a hexadecimal string "0123456789abcdef".
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*
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* + substitutes one of 32 symbols for every two hex digits (octet)
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*
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*/
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var passify = function(hexstr)
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{
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var
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// lookup table to convert a single character to a symbol
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symtab = [
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"A", "B", "C", "D", "E", "F", "G", "H",
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"a", "b", "c", "d", "e", "f", "g", "h",
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"2", "3", "4", "5", "6", "7", "8", "9",
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"#", "$", "%", "*", "+", "=", "@", "?"
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],
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// lookup table to convert a single hex character to its decimal equivalent
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hex2int = {
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"0":0, "1":1, "2":2, "3":3, "4":4, "5":5, "6":6, "7":7,
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"8":8, "9":9, "a":10, "b":11, "c":12, "d":13, "e":14, "f":15
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},
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// our result
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result = "",
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// misc
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i, octet;
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// convert each octet in the hex string to one of our symbols
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for(i=0;i<hexstr.length/2;++i)
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{
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octet = hex2int[hexstr[i*2]]*16 + hex2int[hexstr[i*2+1]];
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result = result + symtab[ octet % symtab.length ];
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}
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// finished
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return result;
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};
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// get hmac
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var hmac = (SHA1.hmac(secret,text)).toLowerCase();
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// split into four 10 character strings and "passify", and return the array
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// include the unpassified versions afterward
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return [
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passify(hmac.slice( 0,24)),
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hmac.slice( 0,10) ];
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};
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