Add encryption

src/shared/Encrypter.ts

@@ -0,0 +1,42 @@
+// Based off this stackoverflow answer: https://stackoverflow.com/a/66476430
+// No point reinventing the wheel
+
+import crypto from 'crypto';
+
+export class Encrypter {
+  private static algorithm = 'aes-256-cbc';
+  private static key: Buffer;
+
+  static initialize(encryptionKey: string) {
+    this.key = crypto.scryptSync(encryptionKey, 'salt', 32);
+  }
+
+  static encrypt(clearText: string): string {
+    const iv = crypto.randomBytes(16);
+    const cipher = crypto.createCipheriv(this.algorithm, this.key, iv);
+    const encrypted = cipher.update(clearText, 'utf8', 'hex');
+
+    return [
+      encrypted + cipher.final('hex'),
+      Buffer.from(iv).toString('hex'),
+    ].join('|');
+  }
+
+  static decrypt(encryptedText: string): string {
+    const [encrypted, iv] = encryptedText.split('|');
+
+    if (!iv) throw new Error('IV not found');
+
+    const decipher = crypto.createDecipheriv(
+      this.algorithm,
+      this.key,
+      Buffer.from(iv, 'hex')
+    );
+
+    return decipher.update(encrypted, 'hex', 'utf8') + decipher.final('utf8');
+  }
+
+  static hash(clearText: string): string {
+    return crypto.createHash('sha256', this.key).update(clearText).digest('base64');
+  }
+}