/**
 * Cryptographic operations for IoTeX SDK
 */
/**
 * Generate a new ECDSA key pair
 */
export declare function generateKeyPair(): {
    privateKey: string;
    publicKey: string;
    address: string;
};
/**
 * Get public key from private key
 */
export declare function getPublicKey(privateKey: string): string;
/**
 * Get IoTeX address from private key
 */
export declare function getAddress(privateKey: string): string;
/**
 * Get Ethereum address from private key
 */
export declare function getEthAddress(privateKey: string): string;
/**
 * Convert IoTeX address to Ethereum address
 */
export declare function toEthAddress(ioAddress: string): string;
/**
 * Convert Ethereum address to IoTeX address
 */
export declare function toIoAddress(ethAddress: string): string;
/**
 * Sign a message with Ethereum-style prefix
 */
export declare function signMessage(privateKey: string, message: string): Promise<string>;
/**
 * Verify a signature
 */
export declare function verifyMessage(message: string, signature: string, address: string): boolean;
/**
 * Hash data using SHA256
 */
export declare function hashSHA256(data: Buffer | string): Buffer;
/**
 * Hash data using Keccak256
 */
export declare function hashKeccak256(data: string | Uint8Array): string;
/**
 * Encrypt data using AES-256-CFB
 */
export declare function encrypt(data: Buffer, key: Buffer): Buffer;
/**
 * Decrypt data using AES-256-CFB
 */
export declare function decrypt(data: Buffer, key: Buffer): Buffer;
/**
 * Derive encryption key from password using SHA256
 */
export declare function deriveKeyFromPassword(password: string): Buffer;
/**
 * Sign action (transaction) with private key
 */
export declare function signAction(serializedAction: Buffer, privateKey: string): string;
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