[TSM.ID].[11031972] PXE : Platform X Ecosystem I [118 Module -LIVE-]

jumpa-vc/lib/xcu-quantum-cipher.ts

@@ -0,0 +1,66 @@
+export class XCUQuantumCipher {
+	private key: CryptoKey | null = null;
+	private roomSecret: string;
+
+	constructor(roomSecret: string) {
+		this.roomSecret = roomSecret;
+	}
+
+	public async initialize() {
+		const enc = new TextEncoder();
+		const keyMaterial = await crypto.subtle.importKey(
+			"raw",
+			enc.encode(this.roomSecret.padEnd(32, "0").slice(0, 32)), // 256-bit derivation
+			{ name: "PBKDF2" },
+			false,
+			["deriveBits", "deriveKey"]
+		);
+
+		this.key = await crypto.subtle.deriveKey(
+			{
+				name: "PBKDF2",
+				salt: enc.encode("xcom_ultra_salt_v1"),
+				iterations: 100000,
+				hash: "SHA-256",
+			},
+			keyMaterial,
+			{ name: "AES-GCM", length: 256 },
+			false,
+			["encrypt", "decrypt"]
+		);
+	}
+
+	public async encrypt(plaintext: string): Promise<Uint8Array> {
+		if (!this.key) throw new Error("Cipher not initialized");
+		const iv = crypto.getRandomValues(new Uint8Array(12));
+		const enc = new TextEncoder();
+		const ciphertext = await crypto.subtle.encrypt(
+			{
+				name: "AES-GCM",
+				iv: iv,
+			},
+			this.key,
+			enc.encode(plaintext)
+		);
+		const result = new Uint8Array(iv.length + ciphertext.byteLength);
+		result.set(iv, 0);
+		result.set(new Uint8Array(ciphertext), iv.length);
+		return result;
+	}
+
+	public async decrypt(data: Uint8Array): Promise<string> {
+		if (!this.key) throw new Error("Cipher not initialized");
+		const iv = data.slice(0, 12);
+		const ciphertext = data.slice(12);
+		const plaintext = await crypto.subtle.decrypt(
+			{
+				name: "AES-GCM",
+				iv: iv,
+			},
+			this.key,
+			ciphertext
+		);
+		const dec = new TextDecoder();
+		return dec.decode(plaintext);
+	}
+}