/**
 * @license
 * Copyright 2020 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/**
 * Validates AES key sizes, at the moment only 128-bit and 256-bit keys are
 * supported.
 *
 * @param n the key size in bytes
 * @throws {!InvalidArgumentsException}
 * @static
 */
export declare function validateAesKeySize(n: number): void;
/**
 * Validates that the input is a non null Uint8Array.
 *
 * @throws {!InvalidArgumentsException}
 * @static
 */
export declare function requireUint8Array(input: Uint8Array): void;
/**
 * Validates version, throws exception if candidate version is negative or
 * bigger than expected.
 *
 * @param candidate - version to be validated
 * @param maxVersion - upper bound on version
 * @throws {!SecurityException}
 * @static
 */
export declare function validateVersion(candidate: number, maxVersion: number): void;
/**
 * Validates ECDSA parameters.
 *
 * @throws {!SecurityException}
 */
export declare function validateEcdsaParams(curve: string, hash: string): void;