import type { ECDH } from './types.js';
/**
 * Wraps an X25519 secret key into an ECDH method that can be used to compute a shared secret with a public key.
 * @param mySecretKey A `Uint8Array` of length 32 representing the bytes of my secret key
 * @returns an `ECDH` method with the signature `(theirPublicKey: Uint8Array) => Promise<Uint8Array>`
 *
 * @throws 'invalid_argument:...' if the secret key size is wrong
 */
export declare function createX25519ECDH(mySecretKey: Uint8Array): ECDH;
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