/**
 * XChaCha20-Poly1305 Encryption (WASM-backed)
 *
 * Thin wrappers over `@totalreclaw/core` WASM module.
 *
 * Wire format (base64-encoded): [nonce: 24 bytes][tag: 16 bytes][ciphertext: variable]
 */
/**
 * Encrypt a UTF-8 plaintext string with XChaCha20-Poly1305.
 *
 * Wire format (base64-encoded):
 *   [nonce: 24 bytes][tag: 16 bytes][ciphertext: variable]
 *
 * @param plaintext - Text to encrypt
 * @param encryptionKey - 32-byte encryption key
 * @returns Base64-encoded string containing nonce || tag || ciphertext
 */
export declare function encrypt(plaintext: string, encryptionKey: Buffer): string;
/**
 * Decrypt a base64-encoded XChaCha20-Poly1305 blob back to a UTF-8 string.
 *
 * Expects the wire format produced by encrypt() above.
 *
 * @param encryptedBase64 - Base64-encoded string of nonce || tag || ciphertext
 * @param encryptionKey - 32-byte encryption key
 * @returns Decrypted UTF-8 string
 */
export declare function decrypt(encryptedBase64: string, encryptionKey: Buffer): string;
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