encrypt.ts

import { randomAsU8a } from '../random/asU8a.ts';
import { naclSecretbox } from './tweetnacl.ts';

interface Encrypted {
  encrypted: Uint8Array;
  nonce: Uint8Array;
}

/**
 * @name naclEncrypt
 * @summary Encrypts a message using the supplied secretKey and nonce
 * @description
 * Returns an encrypted message, using the `secretKey` and `nonce`. If the `nonce` was not supplied, a random value is generated.
 * @example
 * <BR>
 *
 * ```javascript
 * import { naclEncrypt } from 'https://deno.land/x/polkadot@0.2.40/util-crypto/mod.ts';
 *
 * naclEncrypt([...], [...]); // => [...]
 * ```
 */
export function naclEncrypt (message: Uint8Array, secret: Uint8Array, nonce: Uint8Array = randomAsU8a(24)): Encrypted {
  return {
    encrypted: naclSecretbox(message, nonce, secret),
    nonce
  };
}