/// <reference types="node" />
import { Nonce } from "./common";
import { VerifyMessageChunkSignatureOptions } from "./crypto_utils";
export declare function makePseudoRandomBuffer(secret: Nonce, seed: Nonce, minLength: number, sha1or256: "SHA1" | "SHA256"): Buffer;
export interface ComputeDerivedKeysOptions {
    signatureLength: number;
    signingKeyLength: number;
    encryptingKeyLength: number;
    encryptingBlockSize: number;
    algorithm: string;
    sha1or256?: "SHA1" | "SHA256";
}
export interface DerivedKeys extends ComputeDerivedKeysOptions {
    signatureLength: number;
    signingKeyLength: number;
    encryptingKeyLength: number;
    encryptingBlockSize: number;
    algorithm: string;
    sha1or256: "SHA1" | "SHA256";
    signingKey: Buffer;
    encryptingKey: Buffer;
    initializationVector: Buffer;
}
export declare function computeDerivedKeys(secret: Nonce, seed: Nonce, options: ComputeDerivedKeysOptions): DerivedKeys;
/**
 * @method reduceLength
 * @param buffer
 * @param byteToRemove
 * @return buffer
 */
export declare function reduceLength(buffer: Buffer, byteToRemove: number): Buffer;
/**
 * @method removePadding
 * @param buffer
 * @return buffer with padding removed
 */
export declare function removePadding(buffer: Buffer): Buffer;
export declare type VerifyChunkSignatureOptions = VerifyMessageChunkSignatureOptions;
/**
 * @method verifyChunkSignature
 *
 *     const signer = {
 *           signatureLength : 128,
 *           algorithm : "RSA-SHA256",
 *           public_key: "qsdqsdqsd"
 *     };
 *
 * @param chunk  The message chunk to verify.
 * @param options
 * @param options.signatureLength
 * @param options.algorithm  the algorithm.
 * @param options.publicKey
 * @return {*}
 */
export declare function verifyChunkSignature(chunk: Buffer, options: VerifyChunkSignatureOptions): boolean;
export declare function computePaddingFooter(buffer: Buffer, derivedKeys: DerivedKeys): Buffer;
export declare function encryptBufferWithDerivedKeys(buffer: Buffer, derivedKeys: DerivedKeys): Buffer;
export declare function decryptBufferWithDerivedKeys(buffer: Buffer, derivedKeys: DerivedKeys): Buffer;
/**
 * @method makeMessageChunkSignatureWithDerivedKeys
 * @param message
 * @param derivedKeys
 * @return
 */
export declare function makeMessageChunkSignatureWithDerivedKeys(message: Buffer, derivedKeys: DerivedKeys): Buffer;
/**
 * @method verifyChunkSignatureWithDerivedKeys
 * @param chunk
 * @param derivedKeys
 * @return
 */
export declare function verifyChunkSignatureWithDerivedKeys(chunk: Buffer, derivedKeys: DerivedKeys): boolean;