/** @internal */
export declare enum NumberFormat {
    Int8LE = 1,
    UInt8LE = 2,
    Int16LE = 3,
    UInt16LE = 4,
    Int32LE = 5,
    Int8BE = 6,
    UInt8BE = 7,
    Int16BE = 8,
    UInt16BE = 9,
    Int32BE = 10,
    UInt32LE = 11,
    UInt32BE = 12,
    Float32LE = 13,
    Float64LE = 14,
    Float32BE = 15,
    Float64BE = 16,
    UInt64LE = 17,
    UInt64BE = 18,
    Int64LE = 19,
    Int64BE = 20
}
/**
 * Get the size in bytes of specified number format.
 */
export declare function sizeOfNumberFormat(format: NumberFormat): 1 | 2 | 0 | 4 | 8;
export declare function getNumber(buf: ArrayLike<number>, fmt: NumberFormat, offset: number): number;
export declare function setNumber(buf: Uint8Array, fmt: NumberFormat, offset: number, r: number): void;
export declare function uintOfBuffer(data: Uint8Array): number;
export declare function intOfBuffer(data: Uint8Array): number;
export declare function bufferToArray(data: Uint8Array, fmt: NumberFormat): number[];
export declare function concatBufferArray(chunks: Uint8Array[]): Uint8Array;
export declare function sha256(buffers: Uint8Array[]): Promise<Uint8Array>;
/**
 * Compute keyed-Hash Message Authentication Code as defined in RFC 2104.
 */
export declare function sha256Hmac(key: Uint8Array, msg: Uint8Array): Promise<Uint8Array>;
export declare function fromBase64(encoded: string): Uint8Array;
export declare function toBase64(data: Uint8Array): string;
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