/**
 * RecipientKeyResolver — resolves encryption key availability and retrieves
 * cryptographic material for a set of recipients under a given scheme.
 *
 * Implements the IRecipientKeyResolver interface, delegating key lookups
 * to an injected IKeyStore dependency.
 *
 * @see Requirements 2.3, 3.2, 7.2, 11.7, 14.1, 14.2, 14.4
 */
import { MessageEncryptionScheme } from '../../enumerations/messaging/messageEncryptionScheme';
import { IKeyStore } from '../../interfaces/messaging/keyStore';
import { IRecipientKeyAvailability, IRecipientKeyResolver, IResolvedRecipientKeys } from '../../interfaces/messaging/recipientKeyResolver';
/**
 * Resolves which encryption schemes are available for a set of recipients
 * and retrieves the actual cryptographic material needed for encryption.
 *
 * @see Requirement 2.3 — Query keyserver for public keys by email
 * @see Requirement 11.7 — Resolve recipient keys and display warnings
 */
export declare class RecipientKeyResolver implements IRecipientKeyResolver {
    private readonly keyStore;
    constructor(keyStore: IKeyStore);
    /**
     * Check key availability for all recipients.
     *
     * Queries the key store for each email to determine which types of
     * cryptographic material are available.
     *
     * @param emails - Array of recipient email addresses to check
     * @returns Availability information for each recipient
     */
    resolveAvailability(emails: string[]): Promise<IRecipientKeyAvailability[]>;
    /**
     * Resolve actual keys/certificates for a given encryption scheme.
     *
     * Retrieves the cryptographic material needed to encrypt a message
     * under the specified scheme. Populates the appropriate key map and
     * identifies recipients missing the required material.
     *
     * @param emails - Array of recipient email addresses
     * @param scheme - The encryption scheme to resolve keys for
     * @returns Resolved keys and lists of recipients with missing material
     * @throws EmailError with RECIPIENT_KEY_MISSING when required keys are missing
     */
    resolveKeysForScheme(emails: string[], scheme: MessageEncryptionScheme): Promise<IResolvedRecipientKeys>;
}
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