增加了git功能，但是还未完善

node_modules/sha.js/sha224.js

@@ -0,0 +1,55 @@
+'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;