/**
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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 Sha256 = require('./sha256')
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var Hash = require('./hash')
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var Buffer = require('safe-buffer').Buffer
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var W = new Array(64)
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function Sha224 () {
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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(Sha224, Sha256)
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Sha224.prototype.init = function () {
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this._a = 0xc1059ed8
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this._b = 0x367cd507
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this._c = 0x3070dd17
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this._d = 0xf70e5939
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this._e = 0xffc00b31
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this._f = 0x68581511
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this._g = 0x64f98fa7
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this._h = 0xbefa4fa4
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return this
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}
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Sha224.prototype._hash = function () {
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var H = Buffer.allocUnsafe(28)
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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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return H
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}
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module.exports = Sha224
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