Merge pull request #14 from jgarzik/encfile

Add EncFile module, for encrypted wallet files

util/EncFile.js

@@ -0,0 +1,38 @@
+
+var fs = require('fs');
+var crypto = require('crypto');
+var zlib = require('zlib');
+
+exports.readFileSync = function(enc_method, enc_passphrase, filename)
+{
+	var crypted = fs.readFileSync(filename, 'binary');
+
+	var decipher = crypto.createDecipher(enc_method, enc_passphrase);
+	var dec = decipher.update(crypted, 'binary', 'binary');
+	dec += decipher.final('binary');
+	return dec;
+};
+
+exports.readJFileSync = function(enc_method, enc_passphrase, filename)
+{
+	var raw = this.readFileSync(enc_method, enc_passphrase, filename);
+	return JSON.parse(raw);
+};
+
+exports.writeFileSync = function(enc_method, enc_passphrase, filename, data)
+{
+	var cipher = crypto.createCipher(enc_method, enc_passphrase);
+	var crypted = cipher.update(data, 'binary', 'binary');
+	crypted += cipher.final('binary');
+
+	fs.writeFileSync(filename, crypted, 'binary');
+
+	return true;
+};
+
+exports.writeJFileSync = function(enc_method, enc_passphrase, filename, obj)
+{
+	var raw = JSON.stringify(obj);
+	return this.writeFileSync(enc_method, enc_passphrase, filename, raw);
+};
+