export abstract class CryptoFunctionService { pbkdf2: (password: string | ArrayBuffer, salt: string | ArrayBuffer, algorithm: 'sha256' | 'sha512', iterations: number) => Promise; hash: (value: string | ArrayBuffer, algorithm: 'sha1' | 'sha256' | 'sha512') => Promise; hmac: (value: ArrayBuffer, key: ArrayBuffer, algorithm: 'sha1' | 'sha256' | 'sha512') => Promise; }