import type { EncryptionKey } from "../models/EncryptionKey";
/**
 * Signicat Encryption Service
 * Handles JWE encryption/decryption for Signicat API responses
 */
export declare class EncryptionService {
    /**
     * Generate a new RSA key pair for encryption
     * @param keySize Key size in bits (2048 or 4096)
     * @returns Promise containing public and private keys in JWK format
     */
    static generateRSAKeyPair(keySize?: 2048 | 4096): Promise<{
        publicKey: EncryptionKey;
        privateKey: any;
    }>;
    /**
     * Decrypt JWE response from Signicat
     * @param jweToken The JWE token received from Signicat
     * @param privateKey The private key in JWK format
     * @returns Decrypted payload as JSON object
     */
    static decryptJWE(jweToken: string, privateKey: any): Promise<any>;
    /**
     * Check if response is encrypted (JWE format)
     * @param contentType The Content-Type header from the response
     * @returns True if the response is encrypted
     */
    static isEncryptedResponse(contentType: string): boolean;
    /**
     * Validate encryption key format
     * @param key The encryption key to validate
     * @returns True if the key is valid
     */
    static validateEncryptionKey(key: EncryptionKey): boolean;
}