new encrypt/decrypt functions to support #175

todbot · Jul 6, 2022 · f595d78 · f595d78
1 parent 6e549a5
commit f595d78
Showing 1 changed file with 27 additions and 4 deletions.
diff --git a/app/utils.js b/app/utils.js
@@ -1,14 +1,18 @@
 
 'use strict';
 
+const crypto = require('crypto');
+const encAlgorithm = 'aes-256-ctr';
+const encKey = Buffer.from('16808abd2ec954b81e32dc46529ab5eed71a8b6d1ec', 'base64')
+const encIVlen = 16;
 
 var Utils = {
 	cheesyClone: function(o) {
 		return JSON.parse(JSON.stringify(o));
 	},
-	cheapUid: function(len) {
-		return Math.random().toString(36).substr(2, len);
-	},
+	// cheapUid: function(len) {
+	// 	return Math.random().toString(36).substr(2, len);
+	// },
 	generateId: function(name,len) {
 		return name.toLowerCase().replace(/\W+/g, '') +'-'+ this.cheapUid(len);
 	},
@@ -21,7 +25,26 @@ var Utils = {
 	generateRandomHostId: function() {
 		return ("000"+Math.floor(Math.random()*0xffff).toString(16)).slice(-4).toUpperCase() +
 			   ("000"+Math.floor(Math.random()*0xffff).toString(16)).slice(-4).toUpperCase();
-	}
+	},
+
+	encrypt: function(text) {
+		let iv = crypto.randomBytes(encIVlen);
+		let cipher = crypto.createCipheriv(encAlgorithm, Buffer.from(encKey, 'hex'), iv);
+		let encrypted = cipher.update(text);
+		encrypted = Buffer.concat([encrypted, cipher.final()]);
+		return iv.toString('hex') + ':' + encrypted.toString('hex');
+	},
+
+	decrypt: function(text) {
+		let textParts = text.split(':');
+		let iv = Buffer.from(textParts.shift(), 'hex');
+		let encryptedText = Buffer.from(textParts.join(':'), 'hex');
+		let decipher = crypto.createDecipheriv(encAlgorithm, Buffer.from(encKey, 'hex'), iv);
+		let decrypted = decipher.update(encryptedText);
+		decrypted = Buffer.concat([decrypted, decipher.final()]);
+		return decrypted.toString();
+	},
+
 };
 
 module.exports = Utils;