/*
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* A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
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* in FIPS PUB 180-1
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* Version 2.1a Copyright Paul Johnston 2000 - 2002.
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* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
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* Distributed under the BSD License
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* See http://pajhome.org.uk/crypt/md5 for details.
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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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0x5a827999, 0x6ed9eba1, 0x8f1bbcdc | 0, 0xca62c1d6 | 0
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]
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var W = new Array(80)
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function Sha1 () {
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this.init()
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this._w = W
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Hash.call(this, 64, 56)
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}
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inherits(Sha1, Hash)
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Sha1.prototype.init = function () {
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this._a = 0x67452301
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this._b = 0xefcdab89
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this._c = 0x98badcfe
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this._d = 0x10325476
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this._e = 0xc3d2e1f0
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return this
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}
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function rotl1 (num) {
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return (num << 1) | (num >>> 31)
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}
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function rotl5 (num) {
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return (num << 5) | (num >>> 27)
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}
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function rotl30 (num) {
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return (num << 30) | (num >>> 2)
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}
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function ft (s, b, c, d) {
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if (s === 0) return (b & c) | ((~b) & d)
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if (s === 2) return (b & c) | (b & d) | (c & d)
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return b ^ c ^ d
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}
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Sha1.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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for (var i = 0; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
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for (; i < 80; ++i) W[i] = rotl1(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16])
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for (var j = 0; j < 80; ++j) {
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var s = ~~(j / 20)
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var t = (rotl5(a) + ft(s, b, c, d) + e + W[j] + K[s]) | 0
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e = d
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d = c
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c = rotl30(b)
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b = a
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a = t
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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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}
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Sha1.prototype._hash = function () {
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var H = Buffer.allocUnsafe(20)
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H.writeInt32BE(this._a | 0, 0)
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H.writeInt32BE(this._b | 0, 4)
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H.writeInt32BE(this._c | 0, 8)
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H.writeInt32BE(this._d | 0, 12)
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H.writeInt32BE(this._e | 0, 16)
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return H
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}
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module.exports = Sha1
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