/**
 * VeChain Certificate Utilities
 *
 * Certificates in VeChain are used for:
 * - Identity verification
 * - DApp authentication
 * - Proving ownership without sending transactions
 * - Supply chain certifications
 *
 * Certificate structure follows VIP-192 standard
 */
/**
 * Certificate purpose types
 */
export declare enum CertificatePurpose {
    IDENTIFICATION = "identification",
    AGREEMENT = "agreement"
}
/**
 * Certificate payload structure
 */
export interface CertificatePayload {
    purpose: CertificatePurpose;
    payload: {
        type: string;
        content: string;
    };
}
/**
 * Signed certificate structure
 */
export interface Certificate {
    purpose: CertificatePurpose;
    payload: {
        type: string;
        content: string;
    };
    domain: string;
    timestamp: number;
    signer: string;
    signature?: string;
}
/**
 * Create a certificate for signing
 */
export declare function createCertificate(purpose: CertificatePurpose, payloadType: string, content: string, domain: string, signer: string): Certificate;
/**
 * Encode certificate for signing
 */
export declare function encodeCertificate(cert: Certificate): string;
/**
 * Hash certificate message
 */
export declare function hashCertificate(cert: Certificate): string;
/**
 * Sign certificate with private key
 */
export declare function signCertificate(cert: Certificate, privateKey: string): Promise<Certificate>;
/**
 * Verify certificate signature
 */
export declare function verifyCertificate(cert: Certificate): {
    valid: boolean;
    recoveredAddress?: string;
    error?: string;
};
/**
 * Check if certificate is expired
 */
export declare function isCertificateExpired(cert: Certificate, maxAgeSeconds?: number): boolean;
/**
 * Create identification certificate
 */
export declare function createIdentificationCertificate(domain: string, signer: string, customContent?: string): Certificate;
/**
 * Create agreement certificate
 */
export declare function createAgreementCertificate(domain: string, signer: string, agreementContent: string): Certificate;
/**
 * Supply chain certificate payload
 */
export interface SupplyChainCertPayload {
    productId: string;
    certType: 'origin' | 'quality' | 'authenticity' | 'custom';
    issuer: string;
    data: Record<string, unknown>;
    validUntil?: number;
}
/**
 * Create supply chain certificate content
 */
export declare function createSupplyChainCertContent(payload: SupplyChainCertPayload): string;
/**
 * Parse supply chain certificate content
 */
export declare function parseSupplyChainCertContent(content: string): SupplyChainCertPayload | null;
/**
 * Validate supply chain certificate
 */
export declare function validateSupplyChainCert(cert: Certificate): {
    valid: boolean;
    payload?: SupplyChainCertPayload;
    errors: string[];
};
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