[INIT] Initial Project Structure

lib/services/crypt.service.ts

@@ -0,0 +1,37 @@
+import crypto, { createCipheriv, createDecipheriv, randomBytes } from "node:crypto";
+
+export async function generateKeypair() {
+  return crypto.generateKeyPairSync("rsa", {
+    modulusLength: 2048,
+    publicKeyEncoding: { type: "pkcs1", format: "pem" },
+    privateKeyEncoding: { type: "pkcs1", format: "pem" },
+  });
+}
+
+export async function encrypt(plaintext: string, hexKey: string): Promise<string> {
+  const key = Buffer.from(hexKey, "hex");
+  const algorithm = "aes-256-cbc"; // Encryption algorithm
+  const iv = randomBytes(16); // Initialization vector
+
+  const cipher = createCipheriv(algorithm, key, iv);
+  let encrypted = cipher.update(plaintext, "utf8", "hex");
+  encrypted += cipher.final("hex");
+
+  // Combine IV and encrypted text
+  return iv.toString("hex") + ":" + encrypted;
+}
+
+// Decrypt function
+export async function decrypt(encryptedText: string, hexKey: string): Promise<string> {
+  const key = Buffer.from(hexKey, "hex");
+  const algorithm = "aes-256-cbc";
+  const textParts = encryptedText.split(":");
+  const iv = Buffer.from(textParts[0], "hex");
+  const encrypted = textParts[1];
+
+  const decipher = createDecipheriv(algorithm, key, iv);
+  let decrypted = decipher.update(encrypted, "hex", "utf8");
+  decrypted += decipher.final("utf8");
+
+  return decrypted;
+}