initial commit

src/crypto/Service/crypto.service.ts

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+import { Injectable } from '@nestjs/common';
+import * as CryptoJS from 'crypto-js';
+import { Buffer } from 'buffer';
+
+@Injectable()
+export class CryptoService {
+
+    private static secretKey = "";
+
+    static makeid(length:number):string {
+        var result           = '';
+        var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+        var charactersLength = characters.length;
+        for ( var i = 0; i < length; i++ ) { result += characters.charAt(Math.floor(Math.random() *   charactersLength)); }
+        return result;
+    }
+
+    static setKey(k:string) { this.secretKey = k; }
+
+    //The set method is use for encrypt the value.
+    static encrypt(data:string){
+        var key = CryptoJS.enc.Utf8.parse(this.secretKey);
+        var iv = CryptoJS.enc.Utf8.parse(this.makeid(16)); // TODO: Randomize IV to reenhance security
+
+        // console.log("Key: " + key);
+        console.log("Initial Vector: " + iv);
+        
+        var encrypted = CryptoJS.AES.encrypt(CryptoJS.enc.Utf8.parse(data.toString()), key,
+        {
+            keySize: 128 / 8,
+            iv: iv,
+            mode: CryptoJS.mode.CBC,
+            padding: CryptoJS.pad.Pkcs7
+        });
+
+        let out = {
+        "content": encrypted.toString(),
+        "iv": iv
+        };
+
+        // Instead of sending only the encrypted string, send an object with iv and encrypted data
+        return out;
+    }
+
+    //The get method is use for decrypt the value.
+    static decrypt(data:any){
+        console.log("Initial Vector: " + data['iv']);
+
+        var key = CryptoJS.enc.Utf8.parse(this.secretKey);
+
+        var decrypted = CryptoJS.AES.decrypt(data['content'], key, {
+            keySize: 128 / 8,
+            iv: data['iv'],
+            mode: CryptoJS.mode.CBC,
+            padding: CryptoJS.pad.Pkcs7
+        });
+
+        return decrypted.toString(CryptoJS.enc.Utf8);
+    }
+}