'use strict'; /** * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined * in FIPS 180-2 * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009. * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet * */ var inherits = require('inherits'); var Hash = require('./hash'); var Buffer = require('safe-buffer').Buffer; var 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 ]; var W = new Array(64); function Sha256() { this.init(); this._w = W; // new Array(64) Hash.call(this, 64, 56); } inherits(Sha256, Hash); Sha256.prototype.init = function () { this._a = 0x6a09e667; this._b = 0xbb67ae85; this._c = 0x3c6ef372; this._d = 0xa54ff53a; this._e = 0x510e527f; this._f = 0x9b05688c; this._g = 0x1f83d9ab; this._h = 0x5be0cd19; return this; }; function ch(x, y, z) { return z ^ (x & (y ^ z)); } function maj(x, y, z) { return (x & y) | (z & (x | y)); } function sigma0(x) { return ((x >>> 2) | (x << 30)) ^ ((x >>> 13) | (x << 19)) ^ ((x >>> 22) | (x << 10)); } function sigma1(x) { return ((x >>> 6) | (x << 26)) ^ ((x >>> 11) | (x << 21)) ^ ((x >>> 25) | (x << 7)); } function gamma0(x) { return ((x >>> 7) | (x << 25)) ^ ((x >>> 18) | (x << 14)) ^ (x >>> 3); } function gamma1(x) { return ((x >>> 17) | (x << 15)) ^ ((x >>> 19) | (x << 13)) ^ (x >>> 10); } Sha256.prototype._update = function (M) { var w = this._w; var a = this._a | 0; var b = this._b | 0; var c = this._c | 0; var d = this._d | 0; var e = this._e | 0; var f = this._f | 0; var g = this._g | 0; var h = this._h | 0; for (var i = 0; i < 16; ++i) { w[i] = M.readInt32BE(i * 4); } for (; i < 64; ++i) { w[i] = (gamma1(w[i - 2]) + w[i - 7] + gamma0(w[i - 15]) + w[i - 16]) | 0; } for (var j = 0; j < 64; ++j) { var T1 = (h + sigma1(e) + ch(e, f, g) + K[j] + w[j]) | 0; var T2 = (sigma0(a) + maj(a, b, c)) | 0; h = g; g = f; f = e; e = (d + T1) | 0; d = c; c = b; b = a; a = (T1 + T2) | 0; } this._a = (a + this._a) | 0; this._b = (b + this._b) | 0; this._c = (c + this._c) | 0; this._d = (d + this._d) | 0; this._e = (e + this._e) | 0; this._f = (f + this._f) | 0; this._g = (g + this._g) | 0; this._h = (h + this._h) | 0; }; Sha256.prototype._hash = function () { var H = Buffer.allocUnsafe(32); H.writeInt32BE(this._a, 0); H.writeInt32BE(this._b, 4); H.writeInt32BE(this._c, 8); H.writeInt32BE(this._d, 12); H.writeInt32BE(this._e, 16); H.writeInt32BE(this._f, 20); H.writeInt32BE(this._g, 24); H.writeInt32BE(this._h, 28); return H; }; module.exports = Sha256;