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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];
- if(j < 16) T1 += W[j];
- else T1 += sha256_expand(W, j);
- T2 = sha256_Sigma0(a) + majority(a, b, c);
- h = g;
- g = f;
- f = e;
- e = safe_add(d, T1);
- d = c;
- c = b;
- b = a;
- a = safe_add(T1, T2);
- }
-
- /* Compute the current intermediate hash value */
- ihash[0] += a;
- ihash[1] += b;
- ihash[2] += c;
- ihash[3] += d;
- ihash[4] += e;
- ihash[5] += f;
- ihash[6] += g;
- ihash[7] += h;
-}
-
-/* Read the next chunk of data and update the SHA256 computation */
-function sha256_update(data, inputLen) {
- var i, index, curpos = 0;
- /* Compute number of bytes mod 64 */
- index = ((count[0] >> 3) & 0x3f);
- var remainder = (inputLen & 0x3f);
-
- /* Update number of bits */
- if ((count[0] += (inputLen << 3)) < (inputLen << 3)) count[1]++;
- count[1] += (inputLen >> 29);
-
- /* Transform as many times as possible */
- for(i=0; i+63<inputLen; i+=64) {
- for(var j=index; j<64; j++)
- buffer[j] = data.charCodeAt(curpos++);
- sha256_transform();
- index = 0;
- }
-
- /* Buffer remaining input */
- for(var j=0; j<remainder; j++)
- buffer[j] = data.charCodeAt(curpos++);
-}
-
-/* Finish the computation by operations such as padding */
-function sha256_final() {
- var index = ((count[0] >> 3) & 0x3f);
- buffer[index++] = 0x80;
- if(index <= 56) {
- for(var i=index; i<56; i++)
- buffer[i] = 0;
- } else {
- for(var i=index; i<64; i++)
- buffer[i] = 0;
- sha256_transform();
- for(var i=0; i<56; i++)
- buffer[i] = 0;
- }
- buffer[56] = (count[1] >>> 24) & 0xff;
- buffer[57] = (count[1] >>> 16) & 0xff;
- buffer[58] = (count[1] >>> 8) & 0xff;
- buffer[59] = count[1] & 0xff;
- buffer[60] = (count[0] >>> 24) & 0xff;
- buffer[61] = (count[0] >>> 16) & 0xff;
- buffer[62] = (count[0] >>> 8) & 0xff;
- buffer[63] = count[0] & 0xff;
- sha256_transform();
-}
-
-/* Split the internal hash values into an array of bytes */
-function sha256_encode_bytes() {
- var j=0;
- var output = new Array(32);
- for(var i=0; i<8; i++) {
- output[j++] = ((ihash[i] >>> 24) & 0xff);
- output[j++] = ((ihash[i] >>> 16) & 0xff);
- output[j++] = ((ihash[i] >>> 8) & 0xff);
- output[j++] = (ihash[i] & 0xff);
- }
- return output;
-}
-
-/* Get the internal hash as a hex string */
-function sha256_encode_hex() {
- var output = new String();
- for(var i=0; i<8; i++) {
- for(var j=28; j>=0; j-=4)
- output += sha256_hex_digits.charAt((ihash[i] >>> j) & 0x0f);
- }
- return output;
-}
-
-/* Main function: returns a hex string representing the SHA256 value of the
- given data */
-function sha256_digest(data) {
- sha256_init();
- sha256_update(data, data.length);
- sha256_final();
- return sha256_encode_hex();
-}
-
-/* test if the JS-interpreter is working properly */
-function sha256_self_test()
-{
- return sha256_digest("message digest") ==
- "f7846f55cf23e14eebeab5b4e1550cad5b509e3348fbc4efa3a1413d393cb650";
-}
-
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