/**
 * @category Crypto
 * @description Method to symmetrically encrypt the data using *xsalsa20-poly1305* algorithm.
 *
 * @param data Data to encrypt
 * @param key Symmetric key to encrypt the data
 * @returns Encrypted data
 */
export declare const symmetricEncrypt: (data: Uint8Array, key: Uint8Array) => Uint8Array<ArrayBufferLike>;
/**
 * Method to pack data and nonce into one readable bytes array
 *
 * @param encData Encrypted data raw bytes
 * @param nonce Nonce raw bytes
 * @returns Container buffer
 */
export declare const packSymmetricalyEncryptedData: (encData: Uint8Array, nonce: Uint8Array) => Uint8Array<ArrayBufferLike>;
/**
 * @category Crypto
 * @description Method to symmetrically decrypt the data using *xsalsa20-poly1305* algorithm.
 *
 * @param data Data to decrypt
 * @param key Symmetric key to decrypt the data
 * @returns Decrypted data
 */
export declare const symmetricDecrypt: (data: Uint8Array, key: Uint8Array) => Uint8Array<ArrayBufferLike>;
/**
 * Method to unpack data and nonce from one readable bytes array
 *
 * @param data Bytes with encrypted data and nonce
 * @returns Data and nonce
 */
export declare const unpackSymmetricalyEncryptedData: (data: Uint8Array) => {
    nonce: Uint8Array<ArrayBuffer>;
    encData: Uint8Array<ArrayBuffer>;
};