crypto.ts

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`36d64b37` 2026-03-15 Pavel Safronov	1	const AES_PARAMS = { name: 'AES-GCM', length: 256 };
	2	const IV_BYTES = 12;
	3
	4	export const generateRoomKey = () =>
	5	crypto.subtle.generateKey(AES_PARAMS, true, ['encrypt', 'decrypt']);
	6
`b4e7f682` 2026-03-16 Pavel Safronov	7	export const exportRoomKey = async (key: CryptoKey) => {
`36d64b37` 2026-03-15 Pavel Safronov	8	const raw = await crypto.subtle.exportKey('raw', key);
	9	return btoa(String.fromCharCode(...new Uint8Array(raw)))
	10	.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
	11	};
	12
`b4e7f682` 2026-03-16 Pavel Safronov	13	export const importRoomKey = async (base64url: string) => {
`36d64b37` 2026-03-15 Pavel Safronov	14	const b64 = base64url.replace(/-/g, '+').replace(/_/g, '/');
	15	const padded = b64 + '='.repeat((4 - (b64.length % 4)) % 4);
	16	const raw = Uint8Array.from(atob(padded), (c) => c.charCodeAt(0));
	17	return crypto.subtle.importKey('raw', raw, AES_PARAMS, false, ['encrypt', 'decrypt']);
	18	};
	19
`b4e7f682` 2026-03-16 Pavel Safronov	20	export const encryptJson = async (key: CryptoKey, value: unknown) => {
`36d64b37` 2026-03-15 Pavel Safronov	21	const iv = crypto.getRandomValues(new Uint8Array(IV_BYTES));
	22	const plaintext = new TextEncoder().encode(JSON.stringify(value));
	23	const ciphertext = await crypto.subtle.encrypt({ name: 'AES-GCM', iv }, key, plaintext);
	24	const ivB64 = btoa(String.fromCharCode(...iv));
	25	const ctB64 = btoa(String.fromCharCode(...new Uint8Array(ciphertext)));
	26	return `${ivB64}:${ctB64}`;
	27	};
	28
`b4e7f682` 2026-03-16 Pavel Safronov	29	export const decryptJson = async (key: CryptoKey, encryptedValue: string) => {
`36d64b37` 2026-03-15 Pavel Safronov	30	const [ivB64, ctB64] = encryptedValue.split(':');
	31	const iv = Uint8Array.from(atob(ivB64), (c) => c.charCodeAt(0));
	32	const ciphertext = Uint8Array.from(atob(ctB64), (c) => c.charCodeAt(0));
	33	const plaintext = await crypto.subtle.decrypt({ name: 'AES-GCM', iv }, key, ciphertext);
	34	return JSON.parse(new TextDecoder().decode(plaintext));
	35	};