import { Buffer } from "buffer";
/**
 * Crypto utilities for RTZ-IO library
 */
/**
 * Generate a canonical JSON representation of an object
 * @param obj - The object to canonicalize
 * @returns Canonical JSON string
 */
export declare function canonicalizeJson(obj: any): string;
/**
 * Calculate SHA-256 hash of data
 * @param data - Data to hash
 * @returns Hex string of hash
 */
export declare function calculateHash(data: Buffer | string): string;
/**
 * Sign manifest using HMAC-SHA256
 * @param manifest - Manifest object to sign
 * @param privateKey - Private key for signing
 * @returns Base64 encoded signature
 */
export declare function signManifest(manifest: object, privateKey: Buffer): string;
/**
 * Verify manifest signature using HMAC-SHA256
 * @param data - Data buffer to verify
 * @param signature - Base64 encoded signature
 * @param publicKey - Public key for verification
 * @returns True if signature is valid
 */
export declare function verifySignature(data: Buffer, signature: string, publicKey: Buffer): boolean;
/**
 * Encrypt data using AES-256-CBC (simplified for compatibility)
 * @param data - Data to encrypt
 * @param key - Encryption key (32 bytes)
 * @returns Encrypted data with IV and auth tag
 */
export declare function encryptData(data: Buffer, key: Buffer): {
    encrypted: Buffer;
    iv: Buffer;
    authTag: Buffer;
};
/**
 * Decrypt data using AES-256-CBC
 * @param encrypted - Encrypted data
 * @param key - Decryption key (32 bytes)
 * @param iv - Initialization vector
 * @param authTag - Authentication tag
 * @returns Decrypted data
 */
export declare function decryptData(encrypted: Buffer, key: Buffer, iv: Buffer, authTag: Buffer): Buffer;
/**
 * Generate a random encryption key
 * @param length - Key length in bytes (default: 32 for AES-256)
 * @returns Random key buffer
 */
export declare function generateKey(length?: number): Buffer;
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