export declare function clean(length: number): Uint8Array;
export declare function extend(orig: any, length: number, addLength: number, multipleOf: number): Uint8Array;
export declare function pad(num: number, bytes: number, base?: number): string;
export declare function stringToUint8(input: string, out?: Uint8Array, offset?: number): Uint8Array;
export declare function uint8ToBase64(uint8: Uint8Array): string;
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