@zenithcore/core/src/modules/Auth/component-verifier.ts

Core functionality for ZenithKernel framework

/**
 * Component Authentication and Trust Scoring System
 * 
 * Implements zero-knowledge proofs for:
 * - Component Authentication: Verify component identity
 * - Authorization: Prove access rights without revealing credentials
 * - Trust Scoring: Calculate trust levels without exposing metrics
 */

import { generateZKProofFromChunk, verifyZKProofForChunk, QZKProofResult } from '../../protocol/qzkpClient';
import { PQCryptoUtils, DilithiumSign, PQKeyPair } from '../Crypto/pq-crypto';

export interface ComponentMetrics {
    performanceScore: number;
    securityScore: number;
    reliabilityScore: number;
    lastVerified: number;
}

export interface ComponentIdentity {
    id: string;
    version: string;
    hash: string;
    signature: Buffer;
    publicKey: Buffer;
}

export class ComponentVerifier {
    private static readonly TRUST_THRESHOLD = 0.75;
    private static readonly MIN_PERFORMANCE_SCORE = 0.6;
    private static readonly MIN_SECURITY_SCORE = 0.8;

    /**
     * Generate a zero-knowledge proof of component authenticity
     */
    static async proveComponentAuthenticity(
        component: Buffer,
        identity: ComponentIdentity
    ): Promise<QZKProofResult> {
        try {
            // Generate proof of component integrity
            const proof = await generateZKProofFromChunk(component, identity.id);

            // Sign the proof using the component's identity key
            const signature = await DilithiumSign.sign(
                Buffer.from(JSON.stringify(proof)),
                identity.signature
            );

            return {
                ...proof,
                signature,
                componentId: identity.id
            };
        } catch (error) {
            throw new Error(`Failed to prove component authenticity: ${error}`);
        }
    }

    /**
     * Verify a component's authenticity proof
     */
    static async verifyComponentAuthenticity(
        component: Buffer,
        proof: QZKProofResult,
        identity: ComponentIdentity
    ): Promise<boolean> {
        try {
            // Verify the proof signature
            const isSignatureValid = await DilithiumSign.verify(
                Buffer.from(JSON.stringify({
                    proof: proof.proof,
                    publicSignals: proof.publicSignals,
                    zk: proof.zk
                })),
                proof.signature,
                identity.publicKey
            );

            if (!isSignatureValid) {
                throw new Error('Invalid proof signature');
            }

            // Verify the zero-knowledge proof
            return await verifyZKProofForChunk(
                component,
                proof.proof,
                proof.publicSignals
            );
        } catch (error) {
            throw new Error(`Failed to verify component authenticity: ${error}`);
        }
    }

    /**
     * Generate a zero-knowledge proof of authorization
     */
    static async proveAuthorization(
        credentials: Buffer,
        requiredPermissions: string[]
    ): Promise<QZKProofResult> {
        try {
            // Create a proof that shows we have the required permissions
            // without revealing the actual credentials
            const permissionProof = await generateZKProofFromChunk(
                Buffer.concat([
                    credentials,
                    Buffer.from(JSON.stringify(requiredPermissions))
                ]),
                'auth'
            );

            return {
                proof: permissionProof.proof,
                publicSignals: {
                    permissions: requiredPermissions,
                    timestamp: Date.now()
                },
                zk: permissionProof.zk
            };
        } catch (error) {
            throw new Error(`Failed to prove authorization: ${error}`);
        }
    }

    /**
     * Calculate a trust score for a component without exposing individual metrics
     */
    static async calculateTrustScore(metrics: ComponentMetrics): Promise<{
        score: number;
        proof: QZKProofResult;
    }> {
        try {
            // Calculate the base trust score
            const weightedScore = (
                metrics.performanceScore * 0.3 +
                metrics.securityScore * 0.4 +
                metrics.reliabilityScore * 0.3
            );

            // Time decay factor (30 days = 1.0, older = lower score)
            const daysSinceVerification = (Date.now() - metrics.lastVerified) / (1000 * 60 * 60 * 24);
            const timeFactor = Math.max(0, Math.min(1, 30 / daysSinceVerification));

            const finalScore = weightedScore * timeFactor;

            // Generate a zero-knowledge proof of the score calculation
            const proof = await generateZKProofFromChunk(
                Buffer.from(JSON.stringify(metrics)),
                'trust-score'
            );

            return {
                score: finalScore,
                proof: {
                    proof: proof.proof,
                    publicSignals: {
                        scoreRange: finalScore >= ComponentVerifier.TRUST_THRESHOLD ? 'trusted' : 'untrusted',
                        timestamp: Date.now()
                    },
                    zk: proof.zk
                }
            };
        } catch (error) {
            throw new Error(`Failed to calculate trust score: ${error}`);
        }
    }

    /**
     * Verify a component's minimum security requirements
     */
    static async verifySecurityRequirements(
        metrics: ComponentMetrics,
        proof: QZKProofResult
    ): Promise<boolean> {
        try {
            // Verify the proof is valid
            const isProofValid = await verifyZKProofForChunk(
                Buffer.from(JSON.stringify(metrics)),
                proof.proof,
                proof.publicSignals
            );

            if (!isProofValid) {
                return false;
            }

            // Check minimum security requirements
            return (
                metrics.performanceScore >= ComponentVerifier.MIN_PERFORMANCE_SCORE &&
                metrics.securityScore >= ComponentVerifier.MIN_SECURITY_SCORE
            );
        } catch (error) {
            throw new Error(`Failed to verify security requirements: ${error}`);
        }
    }
}