import * as nodeCrypto from 'crypto';
export type PrivateKey = PrivateKeyInput | PrivateKeyInputWithFile;
interface PrivateKeyInput extends nodeCrypto.PrivateKeyInput {
    saltLength?: number;
    passphrase?: string;
}
export interface PrivateKeyInputWithFile extends Omit<PrivateKeyInput, 'key'> {
    file: string;
    key?: string;
}
export interface KeyPair {
    private_key: string;
    public_key: string;
    passphrase?: string;
}
export declare function encrypt(publicKey: string, data: string): string;
export declare function decrypt(privateKey: PrivateKey | string, encryptedData: string): string;
export declare function generateKeyPair(bytes?: number): KeyPair;
export declare function sign(privateKey: PrivateKey | string, data: string): string;
export declare function verifySignature(publicKey: string, data: string, signature: string): boolean;
export {};