import { Observable } from 'rxjs';
/**
 * Prep interfaces for a future Ed25519 challenge/response admin auth flow.
 * No crypto is implemented here - verification is delegated to an injectable
 * service so the real implementation (native WebCrypto Ed25519 support, or a
 * backend verification call) can be swapped in once the backend API exists,
 * without touching AdminAuthService or components.
 */
export interface Ed25519Challenge {
    nonce: string;
    timestamp: string;
    /** Opaque challenge payload the client must sign with its private key. */
    payload: string;
}
export interface Ed25519SignedResponse {
    challenge: Ed25519Challenge;
    publicKey: string;
    signature: string;
}
export interface Ed25519VerificationResult {
    valid: boolean;
    reason?: string;
}
export declare abstract class Ed25519VerificationService {
    abstract requestChallenge(): Observable<Ed25519Challenge>;
    abstract verify(response: Ed25519SignedResponse): Observable<Ed25519VerificationResult>;
}