/**
 * Cross-platform crypto utilities that work in both Node.js and browser environments.
 *
 * Uses the Web Crypto API (globalThis.crypto) which is available in:
 * - All modern browsers
 * - Node.js 16+ (via globalThis.crypto / webcrypto)
 *
 * This avoids importing from 'crypto' which gets externalized by Vite
 * when bundling for the browser.
 */
/**
 * Generate cryptographically secure random bytes.
 * Uses globalThis.crypto.getRandomValues (works in both Node and browser).
 */
export declare function crossPlatformRandomBytes(length: number): Uint8Array;
/**
 * Compute SHA-256 hash of the given data.
 * Uses Web Crypto API (async).
 */
export declare function crossPlatformSha256(data: Uint8Array): Promise<Uint8Array>;
/**
 * Encrypt data using AES-256-GCM.
 * Returns { ciphertext, authTag }.
 */
export declare function aes256GcmEncrypt(key: Uint8Array, plaintext: Uint8Array, iv: Uint8Array): Promise<{
    ciphertext: Uint8Array;
    authTag: Uint8Array;
}>;
/**
 * Decrypt data using AES-256-GCM.
 */
export declare function aes256GcmDecrypt(key: Uint8Array, ciphertext: Uint8Array, iv: Uint8Array, authTag: Uint8Array): Promise<Uint8Array>;
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