增加了git功能，但是还未完善

node_modules/sha.js/index.js

@@ -0,0 +1,19 @@
+'use strict';
+
+module.exports = function SHA(algorithm) {
+	var alg = algorithm.toLowerCase();
+
+	var Algorithm = module.exports[alg];
+	if (!Algorithm) {
+		throw new Error(alg + ' is not supported (we accept pull requests)');
+	}
+
+	return new Algorithm();
+};
+
+module.exports.sha = require('./sha');
+module.exports.sha1 = require('./sha1');
+module.exports.sha224 = require('./sha224');
+module.exports.sha256 = require('./sha256');
+module.exports.sha384 = require('./sha384');
+module.exports.sha512 = require('./sha512');