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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// SHA256 in javascript.
//
// SHA256 {
// SHA256();
// void reset();
// void update(byte[] data, opt_length);
// byte[32] digest();
// }
/** @constructor */
function SHA256() {
this._buf = new Array(64);
this._W = new Array(64);
this._pad = new Array(64);
this._k = [
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];
this._pad[0] = 0x80;
for (var i = 1; i < 64; ++i) this._pad[i] = 0;
this.reset();
}
/** Reset the hasher */
SHA256.prototype.reset = function() {
this._chain = [
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19];
this._inbuf = 0;
this._total = 0;
};
/** Hash the next block of 64 bytes
* @param {Array.<number>} buf A 64 byte buffer
*/
SHA256.prototype._compress = function(buf) {
var W = this._W;
var k = this._k;
function _rotr(w, r) { return ((w << (32 - r)) | (w >>> r)); };
// get 16 big endian words
for (var i = 0; i < 64; i += 4) {
var w = (buf[i] << 24) |
(buf[i + 1] << 16) |
(buf[i + 2] << 8) |
(buf[i + 3]);
W[i / 4] = w;
}
// expand to 64 words
for (var i = 16; i < 64; ++i) {
var s0 = _rotr(W[i - 15], 7) ^ _rotr(W[i - 15], 18) ^ (W[i - 15] >>> 3);
var s1 = _rotr(W[i - 2], 17) ^ _rotr(W[i - 2], 19) ^ (W[i - 2] >>> 10);
W[i] = (W[i - 16] + s0 + W[i - 7] + s1) & 0xffffffff;
}
var A = this._chain[0];
var B = this._chain[1];
var C = this._chain[2];
var D = this._chain[3];
var E = this._chain[4];
var F = this._chain[5];
var G = this._chain[6];
var H = this._chain[7];
for (var i = 0; i < 64; ++i) {
var S0 = _rotr(A, 2) ^ _rotr(A, 13) ^ _rotr(A, 22);
var maj = (A & B) ^ (A & C) ^ (B & C);
var t2 = (S0 + maj) & 0xffffffff;
var S1 = _rotr(E, 6) ^ _rotr(E, 11) ^ _rotr(E, 25);
var ch = (E & F) ^ ((~E) & G);
var t1 = (H + S1 + ch + k[i] + W[i]) & 0xffffffff;
H = G;
G = F;
F = E;
E = (D + t1) & 0xffffffff;
D = C;
C = B;
B = A;
A = (t1 + t2) & 0xffffffff;
}
this._chain[0] += A;
this._chain[1] += B;
this._chain[2] += C;
this._chain[3] += D;
this._chain[4] += E;
this._chain[5] += F;
this._chain[6] += G;
this._chain[7] += H;
};
/** Update the hash with additional data
* @param {Array.<number>|Uint8Array} bytes The data
* @param {number=} opt_length How many bytes to hash, if not all */
SHA256.prototype.update = function(bytes, opt_length) {
if (!opt_length) opt_length = bytes.length;
this._total += opt_length;
for (var n = 0; n < opt_length; ++n) {
this._buf[this._inbuf++] = bytes[n];
if (this._inbuf == 64) {
this._compress(this._buf);
this._inbuf = 0;
}
}
};
/** Update the hash with a specified range from a data buffer
* @param {Array.<number>} bytes The data buffer
* @param {number} start Starting index of the range in bytes
* @param {number} end End index, will not be included in range
*/
SHA256.prototype.updateRange = function(bytes, start, end) {
this._total += (end - start);
for (var n = start; n < end; ++n) {
this._buf[this._inbuf++] = bytes[n];
if (this._inbuf == 64) {
this._compress(this._buf);
this._inbuf = 0;
}
}
};
/**
* Optionally update the hash with additional arguments, and return the
* resulting hash value.
* @param {...*} var_args Data buffers to hash
* @return {Array.<number>} the SHA256 hash value.
*/
SHA256.prototype.digest = function(var_args) {
for (var i = 0; i < arguments.length; ++i)
this.update(arguments[i]);
var digest = new Array(32);
var totalBits = this._total * 8;
// add pad 0x80 0x00*
if (this._inbuf < 56)
this.update(this._pad, 56 - this._inbuf);
else
this.update(this._pad, 64 - (this._inbuf - 56));
// add # bits, big endian
for (var i = 63; i >= 56; --i) {
this._buf[i] = totalBits & 255;
totalBits >>>= 8;
}
this._compress(this._buf);
var n = 0;
for (var i = 0; i < 8; ++i)
for (var j = 24; j >= 0; j -= 8)
digest[n++] = (this._chain[i] >> j) & 255;
return digest;
};
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