export declare const setFpeInit: (arg: () => any) => void;
interface FpeOptions {
    alphabet?: string;
    additionalCharacters?: string;
    radix?: number;
    digits?: number;
}
/**
 * This Format Preserving Encryption (FPE) function provides FPE-techniques for use in a zero-trust environment. These techniques are based on FPE-FF1 which is described in [NIST:800-38G](https://nvlpubs.nist.gov/nistpubs/specialpublications/nist.sp.800-38g.pdf).
 */
export declare function Fpe(): Promise<{
    encrypt: (key: Uint8Array, tweak: Uint8Array, plaintext: string | number | bigint, options?: FpeOptions) => Promise<string | number | bigint>;
    decrypt: (key: Uint8Array, tweak: Uint8Array, ciphertext: string | number | bigint, options?: FpeOptions) => Promise<string | number | bigint>;
}>;
export {};
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