/**
 * Delegation Credential Issuer
 *
 * Issues W3C Verifiable Credentials for delegations with Ed25519 signatures.
 * Follows the Python POC design (Delegation-Service.md:136-163) where
 * delegations are issued AS W3C VCs.
 *
 * Related Spec: MCP-I §4.1, §4.2, W3C VC Data Model 1.1
 * Python Reference: Delegation-Service.md
 */
import { DelegationCredential, DelegationRecord } from '@kya-os/contracts/delegation';
import { CredentialStatus } from '@kya-os/contracts/vc';
import { AgentIdentity } from '../identity';
/**
 * Options for issuing a delegation credential
 */
export interface IssueDelegationOptions {
    /** VC ID (optional, will be generated if not provided) */
    id?: string;
    /** Issuance date (optional, defaults to now) */
    issuanceDate?: string;
    /** Expiration date (optional, derived from constraints if not provided) */
    expirationDate?: string;
    /** Credential status for StatusList2021 (optional) */
    credentialStatus?: CredentialStatus;
    /** Additional context URIs (optional) */
    additionalContexts?: string[];
}
/**
 * Delegation Credential Issuer
 *
 * Issues W3C Verifiable Credentials for delegations.
 * Per Python POC (Delegation-Service.md:136-146):
 * - Every delegation MUST be issued as a VC
 * - VC is signed with Ed25519 (Ed25519Signature2020)
 * - StatusList2021 support for efficient revocation
 */
export declare class DelegationCredentialIssuer {
    private identity;
    constructor(identity: AgentIdentity);
    /**
     * Issue a delegation credential
     *
     * Creates a W3C Verifiable Credential from a delegation record.
     * Signs it with Ed25519 and returns the complete DelegationCredential.
     *
     * @param delegation - The delegation record to issue as a VC
     * @param options - Issuance options
     * @returns Signed DelegationCredential
     */
    issueDelegationCredential(delegation: DelegationRecord, options?: IssueDelegationOptions): Promise<DelegationCredential>;
    /**
     * Create a delegation record and issue it as a VC in one step
     *
     * Convenience method for creating a new delegation from scratch.
     *
     * @param params - Delegation parameters
     * @param options - Issuance options
     * @returns Signed DelegationCredential
     */
    createAndIssueDelegation(params: {
        id: string;
        issuerDid: string;
        subjectDid: string;
        controller?: string;
        parentId?: string;
        constraints: DelegationRecord['constraints'];
        status?: DelegationRecord['status'];
        metadata?: Record<string, any>;
    }, options?: IssueDelegationOptions): Promise<DelegationCredential>;
    /**
     * Canonicalize VC for signing
     *
     * Uses JCS (JSON Canonicalization Scheme, RFC 8785) to create
     * a deterministic representation of the VC.
     *
     * @param vc - The unsigned VC
     * @returns Canonical JSON string
     */
    private canonicalizeVC;
    /**
     * Sign VC with Ed25519 (Ed25519Signature2020)
     *
     * Creates an Ed25519Signature2020 proof for the VC.
     * Uses the same signing pattern as proof generation.
     *
     * @param vc - The unsigned VC
     * @param canonicalVC - The canonical representation for signing
     * @returns Proof object
     */
    private signVC;
    /**
     * Format base64 private key as PKCS#8 PEM for JOSE library
     *
     * Same as proof generator format.
     */
    private formatPrivateKeyAsPEM;
    /**
     * Get issuer DID
     *
     * @returns The DID of this issuer
     */
    getIssuerDid(): string;
    /**
     * Get issuer key ID
     *
     * @returns The key ID of this issuer
     */
    getIssuerKeyId(): string;
}
/**
 * Create a delegation credential issuer from identity
 *
 * Convenience factory function.
 *
 * @param identity - Agent identity
 * @returns DelegationCredentialIssuer instance
 */
export declare function createDelegationIssuer(identity: AgentIdentity): DelegationCredentialIssuer;