302 lines
8.2 KiB
JavaScript
302 lines
8.2 KiB
JavaScript
/*
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* sha1.js - implementation of SHA-1 hash and HMAC algorithms 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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var SHA1 = (function() // SHA1 "namespace"
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{
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// table for doing number to hex string conversion
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var hextab = ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];
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// convert one character to an array of bytes
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function char_code_to_bytes(code)
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{
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var result = [];
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do
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{
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result.unshift(code & 0xff);
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code >>= 8;
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} while (code);
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return result;
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}
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// convert a string to an array of bytes
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// note: multi-byte characters are included
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function str_to_bytes(str)
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{
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var result = [], i, len = str.length;
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for (i=0; i<len; i++)
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{
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result = result.concat( char_code_to_bytes(str.charCodeAt(i)) );
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}
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return result;
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}
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// take a number and return an array of 8 bytes representing a big-endian int64
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function num_to_big_endian_64(num)
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{
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return [
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(num & 0xff00000000000000) >>> 56,
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(num & 0x00ff000000000000) >>> 48,
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(num & 0x0000ff0000000000) >>> 40,
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(num & 0x000000ff00000000) >>> 32,
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(num & 0x00000000ff000000) >>> 24,
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(num & 0x0000000000ff0000) >>> 16,
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(num & 0x000000000000ff00) >>> 8,
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(num & 0x00000000000000ff)
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];
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}
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// convert an array of bytes to an array of int32 (big-endian)
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function bytes_to_big_endian_32(array)
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{
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var result = [], i, len = array.length;
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for (i=0; i<len; i+=4)
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{
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result.push((array[i] << 24) | (array[i+1] << 16) | (array[i+2] << 8) | array[i+3]);
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}
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return result;
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}
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// take an array of bytes and return the hex string
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function bytes_to_hex(x)
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{
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var
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result = "",
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len = x.length,
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i;
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for (i=0; i<len; i++)
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{
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result += (hextab[x[i] >>> 4]) + (hextab[x[i] & 0xf]);
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}
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return result;
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}
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// compute SHA1 hash
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//
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// input is an array of bytes (big-endian order)
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// returns an array of 20 bytes
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function sha1(byte_array)
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{
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var
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// copy array
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message = byte_array.slice(),
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// store message size for later use
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message_size_in_bits = message.length * 8,
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// Initialize variables:
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h0 = 0x67452301,
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h1 = 0xefcdab89,
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h2 = 0x98badcfe,
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h3 = 0x10325476,
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h4 = 0xc3d2e1f0,
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// variables
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a, b, c, d, e, s, temp, w, i, i_chunk;
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// Pre-processing:
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// append the bit '1' to the message
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message.push(0x80);
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// append (0 <= k < 512) bits '0', so that the resulting message length (in bits) is congruent to 448 = -64 (mod 512)
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while ((message.length + 8) % 64)
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{
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message.push(0);
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}
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// append length of message (before pre-processing), in bits, as 64-bit big-endian integer
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message = message.concat(num_to_big_endian_64(message_size_in_bits));
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// Process the message in successive 512-bit chunks:
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// break message into 512-bit chunks
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for (i_chunk=0; i_chunk<(message.length/64); i_chunk++)
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{
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// break chunk into sixteen 32-bit big-endian words w[i], 0 <= i <= 15
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w = bytes_to_big_endian_32(message.slice(i_chunk*64,(i_chunk*64)+64));
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// Initialize hash value for this chunk:
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a = h0;
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b = h1;
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c = h2;
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d = h3;
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e = h4;
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// Main loop:
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for (i=0; i<80; i++)
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{
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s = i & 0xf;
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if (i >= 16)
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{
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temp = w[(s + 13) & 0xf] ^ w[(s + 8) & 0xf] ^ w[(s + 2) & 0xf] ^ w[s];
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w[s] = (temp << 1) | (temp >>> 31); // rol(temp,1)
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}
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if (i < 20)
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{
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// _______rol(a,5)_________ + _________f[i]________ + e + ___k[i]___ + w[s]
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temp = (((a << 5) | (a >>> 27)) + ( d ^ (b & (c ^ d)) ) + e + 0x5a827999 + w[s]) & 0xffffffff;
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}
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else if (i < 40)
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{
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// _______rol(a,5)_________ + _____f[i]____ + e + ___k[i]___ + w[s]
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temp = (((a << 5) | (a >>> 27)) + ( b ^ c ^ d ) + e + 0x6ed9eba1 + w[s]) & 0xffffffff;
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}
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else if (i < 60)
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{
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// _______rol(a,5)_________ + ___________f[i]________________ + e + ___k[i]___ + w[s]
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temp = (((a << 5) | (a >>> 27)) + ( (b & c) | (b & d) | (c & d) ) + e + 0x8f1bbcdc + w[s]) & 0xffffffff;
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}
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else
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{
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// ________rol(a,5)_________ + _____f[i]____ + e + ___k[i]___ + w[s]
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temp = (((a << 5) | (a >>> 27)) + ( b ^ c ^ d ) + e + 0xca62c1d6 + w[s]) & 0xffffffff;
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}
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e = d;
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d = c;
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c = (b << 30) | (b >>> 2); // c = rol(b,30)
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b = a;
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a = temp;
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}
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// Add this chunk's hash to result so far:
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h0 = (h0 + a) & 0xffffffff;
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h1 = (h1 + b) & 0xffffffff;
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h2 = (h2 + c) & 0xffffffff;
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h3 = (h3 + d) & 0xffffffff;
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h4 = (h4 + e) & 0xffffffff;
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}
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// Produce the final hash value (big-endian):
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return [
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(h0 >>> 24) & 0xff, (h0 >>> 16) & 0xff, (h0 >>> 8) & 0xff, h0 & 0xff,
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(h1 >>> 24) & 0xff, (h1 >>> 16) & 0xff, (h1 >>> 8) & 0xff, h1 & 0xff,
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(h2 >>> 24) & 0xff, (h2 >>> 16) & 0xff, (h2 >>> 8) & 0xff, h2 & 0xff,
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(h3 >>> 24) & 0xff, (h3 >>> 16) & 0xff, (h3 >>> 8) & 0xff, h3 & 0xff,
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(h4 >>> 24) & 0xff, (h4 >>> 16) & 0xff, (h4 >>> 8) & 0xff, h4 & 0xff
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]; // note: returning this as a byte array is quite expensive!
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}
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// compute SHA1
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//
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// input is a string
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// returns a hex string
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function sha1_string(str)
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{
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// get text into byte array, hash, convert to hex string
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return bytes_to_hex(sha1(str_to_bytes(str)));
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}
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// compute HMAC-SHA1
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//
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// key_str and message_str are both strings
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// returns a hex string
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function hmac_sha1(key_str, message_str)
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{
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var
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// convert key & message to byte arrays
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key = str_to_bytes(key_str),
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message = str_to_bytes(message_str),
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// our pads
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opad = new Array(64),
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ipad = new Array(64),
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// misc
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i;
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// setup key
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if (key.length > 64)
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{
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key = sha1(key); // keys longer than blocksize are shortened
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}
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while (key.length < 64)
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{
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key.push(0);
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}
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// setup pads
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for (i=0; i<64; i++)
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{
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opad[i] = 0x5c ^ key[i];
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ipad[i] = 0x36 ^ key[i];
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}
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// calculate HMAC
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return bytes_to_hex(sha1(opad.concat(sha1(ipad.concat(message)))));
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}
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//
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// verification code
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//
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// create a byte string of size number of x's
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function byte_string(x,size)
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{
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var a = "", s = String.fromCharCode(x);
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for (var i=0; i<size; i++)
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{
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a += s;
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};
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return a;
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}
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// test HMAC-SHA1 with known test vectors
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function verify()
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{
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// testing HMAC-SHA1 also naturally tests SHA1
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var tests = [
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[ 'Jefe','what do ya want for nothing?', 'effcdf6ae5eb2fa2d27416d5f184df9c259a7c79' ],
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[ byte_string(0xb,20),'Hi There','b617318655057264e28bc0b6fb378c8ef146be00' ],
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[ byte_string(0xaa,20),byte_string(0xdd,50), '125d7342b9ac11cd91a39af48aa17b4f63f175d3' ],
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[ byte_string(0xc,20),'Test With Truncation','4c1a03424b55e07fe7f27be1d58bb9324a9a5a04' ],
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[ byte_string(0xaa,80),'Test Using Larger Than Block-Size Key - Hash Key First','aa4ae5e15272d00e95705637ce8a3b55ed402112' ],
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[ byte_string(0xaa,80),'Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data','e8e99d0f45237d786d6bbaa7965c7808bbff1a91' ]
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];
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for (var i = 0; i < tests.length; i++) {
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if (hmac_sha1(tests[i][0],tests[i][1]) != tests[i][2]) { return false; }
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};
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return true;
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}
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//
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// exported symbols
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//
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return {
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hash:sha1_string,
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hmac:hmac_sha1,
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test:verify
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};
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}()); // SHA1 "namespace"
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