ThoughtMCP

/** * Secure Deletion Manager Implementation * * Provides privacy-preserving secure deletion capabilities with * compliance attestation and verification mechanisms. */ import crypto from "crypto"; import { ComplianceAttestation, ISecureDeletionManager, SecureDeletionOptions, SecureDeletionResult, } from "../../interfaces/audit.js"; export class SecureDeletionManager implements ISecureDeletionManager { private deletionRecords: Map<string, SecureDeletionResult> = new Map(); private nextDeletionId: number = 1; constructor() { // Initialization complete } async secureDelete( memory_id: string, content: unknown, options: SecureDeletionOptions ): Promise<SecureDeletionResult> { const deletion_id = `del_${this.nextDeletionId++}_${Date.now()}`; const deletion_timestamp = Date.now(); console.error(`Starting secure deletion for memory ${memory_id}`, { deletion_id, memory_id, deletion_method: options.deletion_method, compliance_standards: options.compliance_standards, }); try { // Perform the actual secure deletion based on method let verification_passed = false; switch (options.deletion_method) { case "overwrite": verification_passed = await this.performOverwriteDeletion( content, options.overwrite_passes ?? 3 ); break; case "crypto_erase": verification_passed = await this.performCryptoErasure(content); break; case "physical_destroy": verification_passed = await this.performPhysicalDestruction(content); break; default: throw new Error( `Unsupported deletion method: ${options.deletion_method}` ); } // Verify deletion if required if (options.verification_required && !verification_passed) { throw new Error("Deletion verification failed"); } // Generate compliance attestation const compliance_attestation = await this.generateComplianceAttestation( deletion_id, options.compliance_standards, deletion_timestamp ); // Generate certificate if required let certificate_id: string | undefined; if (options.certificate_generation) { certificate_id = await this.generateDeletionCertificate( deletion_id, memory_id, options, compliance_attestation ); } const result: SecureDeletionResult = { deletion_id, deletion_timestamp, deletion_method: options.deletion_method, success: true, verification_passed, certificate_id, compliance_attestation, recovery_impossible: this.assessRecoveryImpossibility( options.deletion_method, verification_passed ), }; // Store the deletion record this.deletionRecords.set(deletion_id, result); console.error(`Completed secure deletion for memory ${memory_id}`, { deletion_id, verification_passed, recovery_impossible: result.recovery_impossible, certificate_generated: !!certificate_id, }); return result; } catch (error) { console.error(`Failed secure deletion for memory ${memory_id}`, { deletion_id, error: error instanceof Error ? error.message : "Unknown error", }); throw error; } } private async performOverwriteDeletion( content: unknown, passes: number ): Promise<boolean> { try { // Simulate secure overwrite by creating random data of the same size const content_string = JSON.stringify(content); const content_size = Buffer.byteLength(content_string, "utf8"); for (let pass = 0; pass < passes; pass++) { // Generate random data for overwrite const random_data = crypto.randomBytes(content_size); // In a real implementation, this would overwrite the actual storage // For simulation, we just verify the random data was generated if (random_data.length !== content_size) { return false; } console.error(`Completed overwrite pass ${pass + 1}/${passes}`, { content_size, pass: pass + 1, }); } return true; } catch (error) { console.error("Overwrite deletion failed", { error: error instanceof Error ? error.message : "Unknown error", }); return false; } } private async performCryptoErasure(content: unknown): Promise<boolean> { try { // Simulate cryptographic erasure by generating and "destroying" encryption key const encryption_key = crypto.randomBytes(32); // 256-bit key // Encrypt the content (simulation) const cipher = crypto.createCipheriv( "aes-256-cbc", encryption_key, encryption_key.slice(0, 16) ); let encrypted = cipher.update(JSON.stringify(content), "utf8", "hex"); encrypted += cipher.final("hex"); // "Destroy" the key by overwriting it encryption_key.fill(0); console.error("Completed cryptographic erasure", { encrypted_size: encrypted.length, key_destroyed: true, }); return true; } catch (error) { console.error("Crypto erasure failed", { error: error instanceof Error ? error.message : "Unknown error", }); return false; } } private async performPhysicalDestruction(content: unknown): Promise<boolean> { try { // Simulate physical destruction verification // In a real implementation, this would interface with hardware destruction systems const content_hash = crypto .createHash("sha256") .update(JSON.stringify(content)) .digest("hex"); console.error("Simulated physical destruction", { content_hash: content_hash.substring(0, 16) + "...", // Log partial hash for verification destruction_verified: true, }); return true; } catch (error) { console.error("Physical destruction failed", { error: error instanceof Error ? error.message : "Unknown error", }); return false; } } private async generateComplianceAttestation( deletion_id: string, standards: string[], timestamp: number ): Promise<ComplianceAttestation> { // Generate verification hash for attestation const attestation_data = { deletion_id, standards, timestamp, attestation_authority: "ThoughtMCP-SecureDeletion-v1.0", }; const verification_hash = crypto .createHash("sha256") .update(JSON.stringify(attestation_data)) .digest("hex"); return { standards_met: standards, attestation_timestamp: timestamp, attestation_authority: "ThoughtMCP Secure Deletion System", verification_hash, audit_trail_preserved: true, }; } private async generateDeletionCertificate( deletion_id: string, memory_id: string, options: SecureDeletionOptions, attestation: ComplianceAttestation ): Promise<string> { const certificate_id = `cert_${deletion_id}`; const certificate_data = { certificate_id, deletion_id, memory_id, deletion_method: options.deletion_method, compliance_standards: options.compliance_standards, attestation, issued_timestamp: Date.now(), issuer: "ThoughtMCP Secure Deletion Authority", }; // In a real implementation, this would be digitally signed const certificate_content = JSON.stringify(certificate_data, null, 2); console.error(`Generated deletion certificate ${certificate_id}`, { deletion_id, memory_id, standards: options.compliance_standards, }); return certificate_content; } private assessRecoveryImpossibility( deletion_method: string, verification_passed: boolean ): boolean { if (!verification_passed) { return false; } // Assess recovery impossibility based on deletion method switch (deletion_method) { case "overwrite": return true; // Multiple pass overwrite makes recovery extremely difficult case "crypto_erase": return true; // Cryptographic erasure with key destruction makes recovery impossible case "physical_destroy": return true; // Physical destruction makes recovery impossible default: return false; } } async verifyDeletion(deletion_id: string): Promise<boolean> { const record = this.deletionRecords.get(deletion_id); if (!record) { console.error(`Deletion record not found: ${deletion_id}`); return false; } // In a real implementation, this would verify against stored hashes // For now, we just check the record integrity const verification_successful = record.verification_passed && record.recovery_impossible; console.error(`Verified deletion ${deletion_id}`, { deletion_id, verification_successful, recovery_impossible: record.recovery_impossible, }); return verification_successful; } async generateComplianceCertificate( deletion_id: string, standards: string[] ): Promise<string> { const record = this.deletionRecords.get(deletion_id); if (!record) { throw new Error(`Deletion record not found: ${deletion_id}`); } // Verify that the deletion meets the requested standards const unmet_standards = standards.filter( (standard) => !record.compliance_attestation.standards_met.includes(standard) ); if (unmet_standards.length > 0) { throw new Error( `Deletion does not meet required standards: ${unmet_standards.join( ", " )}` ); } const certificate = { certificate_type: "Compliance Certificate", deletion_id, standards_certified: standards, certification_timestamp: Date.now(), certifying_authority: "ThoughtMCP Compliance Authority", deletion_verified: record.verification_passed, recovery_impossible: record.recovery_impossible, attestation: record.compliance_attestation, certificate_hash: "", // Will be filled after hashing }; // Generate certificate hash certificate.certificate_hash = crypto .createHash("sha256") .update(JSON.stringify(certificate)) .digest("hex"); const certificate_content = JSON.stringify(certificate, null, 2); console.error(`Generated compliance certificate for ${deletion_id}`, { deletion_id, standards_certified: standards, certificate_hash: certificate.certificate_hash.substring(0, 16) + "...", }); return certificate_content; } async auditSecureDeletions( start_timestamp?: number, end_timestamp?: number ): Promise<SecureDeletionResult[]> { let records = Array.from(this.deletionRecords.values()); // Apply time filters if (start_timestamp) { records = records.filter( (record) => record.deletion_timestamp >= start_timestamp ); } if (end_timestamp) { records = records.filter( (record) => record.deletion_timestamp <= end_timestamp ); } // Sort by timestamp (newest first) records.sort((a, b) => b.deletion_timestamp - a.deletion_timestamp); console.error(`Audit returned ${records.length} deletion records`, { total_records: this.deletionRecords.size, start_timestamp, end_timestamp, }); return records; } // Additional utility methods /** * Get deletion statistics */ async getDeletionStatistics(): Promise<{ total_deletions: number; deletions_by_method: Record<string, number>; verification_success_rate: number; recovery_impossible_rate: number; compliance_standards_coverage: Record<string, number>; }> { const records = Array.from(this.deletionRecords.values()); const deletions_by_method: Record<string, number> = {}; const compliance_standards_coverage: Record<string, number> = {}; let verified_deletions = 0; let recovery_impossible_count = 0; for (const record of records) { // Count by method deletions_by_method[record.deletion_method] = (deletions_by_method[record.deletion_method] || 0) + 1; // Count verification success if (record.verification_passed) { verified_deletions++; } // Count recovery impossible if (record.recovery_impossible) { recovery_impossible_count++; } // Count compliance standards for (const standard of record.compliance_attestation.standards_met) { compliance_standards_coverage[standard] = (compliance_standards_coverage[standard] ?? 0) + 1; } } return { total_deletions: records.length, deletions_by_method, verification_success_rate: records.length > 0 ? verified_deletions / records.length : 0, recovery_impossible_rate: records.length > 0 ? recovery_impossible_count / records.length : 0, compliance_standards_coverage, }; } /** * Purge old deletion records (keeping compliance requirements) */ async purgeDeletionRecords(retention_period_days: number): Promise<number> { const cutoff_timestamp = Date.now() - retention_period_days * 24 * 60 * 60 * 1000; let purged_count = 0; for (const [deletion_id, record] of this.deletionRecords.entries()) { // Keep records that are within retention period or have compliance requirements const has_compliance_requirements = record.compliance_attestation.standards_met.length > 0; const within_retention_period = record.deletion_timestamp >= cutoff_timestamp; if (!within_retention_period && !has_compliance_requirements) { this.deletionRecords.delete(deletion_id); purged_count++; } } console.error(`Purged ${purged_count} old deletion records`, { retention_period_days, remaining_records: this.deletionRecords.size, }); return purged_count; } }