export interface SealedPayload {
    ciphertext: string;
    nonce: string;
    ephemeralPublicKey: string;
}
/**
 * Encrypts a plaintext to a recipient's X25519 public key using NaCl box with
 * an ephemeral sender keypair. The phone holds the recipient private key in
 * its own memory and decrypts with nacl.box.open(ciphertext, nonce, ephemeralPublicKey, recipientPrivateKey).
 *
 * The wire format is custom (not libsodium crypto_box_seal) but cryptographically equivalent.
 */
export declare function seal(plaintext: string, recipientPublicKeyBase64: string): SealedPayload;
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