/**
 * Encrypts a message using nacl.secretbox with TYPE_0 format:
 * [type(1 byte), iv(24 bytes), sealed(...)] -> Hex encoded.
 */
interface EncryptParams {
    symKey: string;
    message: string;
    iv?: string;
    randomBytes: (size: number) => Uint8Array;
}
export declare function encrypt(params: EncryptParams): string;
/**
 * Decrypts a hex-encoded message using nacl.secretbox with TYPE_0 format.
 * Expects [type(1 byte), iv(24 bytes), sealed(...)].
 */
interface DecryptParams {
    symKey: string;
    encoded: string;
}
export declare function decrypt(params: DecryptParams): string;
export {};
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