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'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 Sha256 = require('./sha256');
var Hash = require('./hash');
var Buffer = require('safe-buffer').Buffer;
var W = new Array(64);
function Sha224() {
this.init();
this._w = W; // new Array(64)
Hash.call(this, 64, 56);
}
inherits(Sha224, Sha256);
Sha224.prototype.init = function () {
this._a = 0xc1059ed8;
this._b = 0x367cd507;
this._c = 0x3070dd17;
this._d = 0xf70e5939;
this._e = 0xffc00b31;
this._f = 0x68581511;
this._g = 0x64f98fa7;
this._h = 0xbefa4fa4;
return this;
};
Sha224.prototype._hash = function () {
var H = Buffer.allocUnsafe(28);
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);
return H;
};
module.exports = Sha224;