/**
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* A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
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* in FIPS 180-2
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* Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
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* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
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*
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*/
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var inherits = require('inherits')
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var Hash = require('./hash')
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var Buffer = require('safe-buffer').Buffer
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var K = [
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0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
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0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
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0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
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0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
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0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
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0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
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0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
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0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
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0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
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0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
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0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
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0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
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0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
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0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
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0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
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0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
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]
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var W = new Array(64)
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function Sha256 () {
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this.init()
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this._w = W // new Array(64)
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Hash.call(this, 64, 56)
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}
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inherits(Sha256, Hash)
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Sha256.prototype.init = function () {
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this._a = 0x6a09e667
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this._b = 0xbb67ae85
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this._c = 0x3c6ef372
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this._d = 0xa54ff53a
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this._e = 0x510e527f
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this._f = 0x9b05688c
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this._g = 0x1f83d9ab
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this._h = 0x5be0cd19
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return this
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}
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function ch (x, y, z) {
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return z ^ (x & (y ^ z))
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}
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function maj (x, y, z) {
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return (x & y) | (z & (x | y))
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}
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function sigma0 (x) {
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return (x >>> 2 | x << 30) ^ (x >>> 13 | x << 19) ^ (x >>> 22 | x << 10)
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}
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function sigma1 (x) {
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return (x >>> 6 | x << 26) ^ (x >>> 11 | x << 21) ^ (x >>> 25 | x << 7)
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}
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function gamma0 (x) {
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return (x >>> 7 | x << 25) ^ (x >>> 18 | x << 14) ^ (x >>> 3)
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}
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function gamma1 (x) {
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return (x >>> 17 | x << 15) ^ (x >>> 19 | x << 13) ^ (x >>> 10)
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}
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Sha256.prototype._update = function (M) {
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var W = this._w
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var a = this._a | 0
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var b = this._b | 0
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var c = this._c | 0
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var d = this._d | 0
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var e = this._e | 0
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var f = this._f | 0
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var g = this._g | 0
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var h = this._h | 0
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for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
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for (; i < 64; ++i) W[i] = (gamma1(W[i - 2]) + W[i - 7] + gamma0(W[i - 15]) + W[i - 16]) | 0
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for (var j = 0; j < 64; ++j) {
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var T1 = (h + sigma1(e) + ch(e, f, g) + K[j] + W[j]) | 0
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var T2 = (sigma0(a) + maj(a, b, c)) | 0
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h = g
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g = f
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f = e
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e = (d + T1) | 0
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d = c
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c = b
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b = a
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a = (T1 + T2) | 0
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}
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this._a = (a + this._a) | 0
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this._b = (b + this._b) | 0
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this._c = (c + this._c) | 0
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this._d = (d + this._d) | 0
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this._e = (e + this._e) | 0
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this._f = (f + this._f) | 0
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this._g = (g + this._g) | 0
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this._h = (h + this._h) | 0
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}
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Sha256.prototype._hash = function () {
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var H = Buffer.allocUnsafe(32)
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H.writeInt32BE(this._a, 0)
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H.writeInt32BE(this._b, 4)
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H.writeInt32BE(this._c, 8)
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H.writeInt32BE(this._d, 12)
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H.writeInt32BE(this._e, 16)
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H.writeInt32BE(this._f, 20)
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H.writeInt32BE(this._g, 24)
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H.writeInt32BE(this._h, 28)
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return H
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}
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module.exports = Sha256
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