import type { AsymmetricKeyGenerator } from '../types/key-generator.js';
import type { Jwk } from '../jose/jwk.js';
import type { KeyConverter } from '../types/key-converter.js';
import type { BytesToPrivateKeyParams, ComputePublicKeyParams, GenerateKeyParams, GetPublicKeyParams, PrivateKeyToBytesParams } from '../types/params-direct.js';
import { CryptoAlgorithm } from './crypto-algorithm.js';
/**
 * The `X25519GenerateKeyParams` interface defines the algorithm-specific parameters that should be
 * passed into the `generateKey()` method when using the X25519 key agreement algorithm.
 */
export interface X25519GenerateKeyParams extends GenerateKeyParams {
    /**
     * A string defining the type of key to generate. The value must be:
     * - `"X25519"`: Elliptic-curve Diffie-Hellman (ECDH) using Curve25519.
     */
    algorithm: 'X25519';
}
/**
 * The `X25519Algorithm` class provides a concrete implementation for key generation,
 * public key derivation, and key conversion using the X25519 elliptic curve. X25519 is a
 * key agreement curve (not a signature curve) used for ECDH key exchange in JWE encryption.
 *
 * This class implements the {@link AsymmetricKeyGenerator | `AsymmetricKeyGenerator`} and
 * {@link KeyConverter | `KeyConverter`} interfaces, providing private key generation,
 * public key derivation, and byte/JWK conversion.
 */
export declare class X25519Algorithm extends CryptoAlgorithm implements AsymmetricKeyGenerator<X25519GenerateKeyParams, Jwk, GetPublicKeyParams>, KeyConverter {
    /**
     * Converts a raw private key in bytes to its corresponding JWK format.
     *
     * @param params - The parameters for the private key conversion.
     * @param params.algorithm - Must be `'X25519'`.
     * @param params.privateKeyBytes - The raw private key as a Uint8Array.
     *
     * @returns A Promise that resolves to the private key in JWK format.
     */
    bytesToPrivateKey({ algorithm, privateKeyBytes }: BytesToPrivateKeyParams & {
        algorithm: 'X25519';
    }): Promise<Jwk>;
    /**
     * Derives the public key in JWK format from a given X25519 private key.
     *
     * @param params - The parameters for the public key derivation.
     * @param params.key - The private key in JWK format from which to derive the public key.
     *
     * @returns A Promise that resolves to the derived public key in JWK format.
     */
    computePublicKey({ key }: ComputePublicKeyParams): Promise<Jwk>;
    /**
     * Generates a new X25519 private key in JWK format.
     *
     * @param params - The parameters for key generation.
     * @param params.algorithm - Must be `'X25519'`.
     *
     * @returns A Promise that resolves to the generated private key in JWK format.
     */
    generateKey({ algorithm }: X25519GenerateKeyParams): Promise<Jwk>;
    /**
     * Retrieves the public key properties from a given X25519 private key in JWK format.
     *
     * @param params - The parameters for retrieving the public key properties.
     * @param params.key - The private key in JWK format.
     *
     * @returns A Promise that resolves to the public key in JWK format.
     */
    getPublicKey({ key }: GetPublicKeyParams): Promise<Jwk>;
    /**
     * Converts a private key from JWK format to a byte array.
     *
     * @param params - The parameters for the private key conversion.
     * @param params.privateKey - The private key in JWK format.
     *
     * @returns A Promise that resolves to the private key as a Uint8Array.
     */
    privateKeyToBytes({ privateKey }: PrivateKeyToBytesParams): Promise<Uint8Array>;
}
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