Added Backend

backend/src/utils/crypt.ts

@@ -0,0 +1,38 @@
+import crypto from "crypto";
+import {secrets} from "./secrets"
+const ALGORITHM = "aes-256-gcm";
+
+
+
+
+export function encrypt(text) {
+    const ENCRYPTION_KEY = Buffer.from(secrets.ENCRYPTION_KEY, "hex");
+    const iv = crypto.randomBytes(16);
+    const cipher = crypto.createCipheriv(ALGORITHM, ENCRYPTION_KEY, iv);
+
+    const encrypted = Buffer.concat([cipher.update(text, "utf8"), cipher.final()]);
+    const tag = cipher.getAuthTag();
+
+    return {
+        iv: iv.toString("hex"),
+        content: encrypted.toString("hex"),
+        tag: tag.toString("hex"),
+    };
+}
+
+export function decrypt({ iv, content, tag }) {
+    const ENCRYPTION_KEY = Buffer.from(secrets.ENCRYPTION_KEY, "hex");
+    const decipher = crypto.createDecipheriv(
+        ALGORITHM,
+        ENCRYPTION_KEY,
+        Buffer.from(iv, "hex")
+    );
+    decipher.setAuthTag(Buffer.from(tag, "hex"));
+
+    const decrypted = Buffer.concat([
+        decipher.update(Buffer.from(content, "hex")),
+        decipher.final(),
+    ]);
+
+    return decrypted.toString("utf8");
+}