/**
 * NaCl sealed box implementation using @noble/* libraries.
 *
 * Wire-compatible with libsodium crypto_box_seal / tweetnacl-sealedbox-js.
 * Protocol: ephPk(32) || xsalsa20poly1305(key, nonce, message)
 *   where key   = HSalsa20(x25519(ephSk, recipientPk), zero_16)
 *         nonce = BLAKE2b(ephPk || recipientPk, 24)
 */
/** Encrypt a message for a recipient's x25519 public key (anonymous sender). */
export declare function seal(message: Uint8Array, recipientPk: Uint8Array): Uint8Array;
/** Decrypt a sealed box with the recipient's keypair. */
export declare function open(sealed: Uint8Array, recipientPk: Uint8Array, recipientSk: Uint8Array): Uint8Array;
/** Generate an x25519 keypair (for tests or key generation). */
export declare function boxKeyPair(): {
    publicKey: Uint8Array;
    secretKey: Uint8Array;
};
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