/// <reference types="node" />
export declare const INT32_MAX_LIMIT = 2147483647;
export type SupportedDigestAlgorithms = 'sha256' | 'sha384';
export type SupportedDerivedKeyLengths = 32 | 64;
interface KdfCtrInput {
    digestAlgorithm: SupportedDigestAlgorithms;
    ikm: Buffer;
    nonce?: Buffer;
    purpose?: Buffer;
    expectedLength: SupportedDerivedKeyLengths;
}
export declare function kdfCounterMode({ digestAlgorithm, ikm, nonce, purpose, expectedLength, }: KdfCtrInput): Buffer;
export declare function rawDerive(ikm: Buffer, explicitInfo: Buffer, length: number, digestAlgorithm: SupportedDigestAlgorithms): Buffer;
export declare function increment(x: Buffer): Buffer;
export {};
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