import type { Pda, PublicKey } from '@metaplex-foundation/umi-public-keys';
import type { Keypair } from './Keypair';
/**
 * Defines the interface for the EdDSA cryptography algorithm.
 * It allows us to create, find and use public keys and keypairs.
 *
 * @category Context and Interfaces
 */
export interface EddsaInterface {
    /** Generates a new keypair. */
    generateKeypair: () => Keypair;
    /** Restores a keypair from a secret key. */
    createKeypairFromSecretKey: (secretKey: Uint8Array) => Keypair;
    /** Restores a keypair from a seed. */
    createKeypairFromSeed: (seed: Uint8Array) => Keypair;
    /** Whether the given public key is on the EdDSA elliptic curve. */
    isOnCurve: (publicKey: PublicKey) => boolean;
    /** Finds a Program-Derived Address from the given programId and seeds. */
    findPda: (programId: PublicKey, seeds: Uint8Array[]) => Pda;
    /** Signs a message with the given keypair. */
    sign: (message: Uint8Array, keypair: Keypair) => Uint8Array;
    /** Verifies a signature for a message with the given public key. */
    verify: (message: Uint8Array, signature: Uint8Array, publicKey: PublicKey) => boolean;
}
/**
 * An implementation of the {@link EddsaInterface} that throws an error when called.
 * @category Signers and PublicKeys
 */
export declare function createNullEddsa(): EddsaInterface;