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Fix #16: Encrypted Blob Storage Adapter for IPFS/Filecoin

Summary

This PR implements a comprehensive encrypted blob storage adapter that addresses all requirements from issue #16. The implementation provides AES-256-GCM encryption for outbound data, IPFS/Filecoin integration, Stellar ledger storage for CIDs, streaming decryption, CID versioning, retry mechanisms, and SHA-256 integrity validation.

🎯 Requirements Addressed

✅ AES-256-GCM encryption for all outbound data ✅ IPFS node or Pinata API integration for decentralized hosting ✅ CID storage on Stellar ledger ✅ Streaming decryption buffer for efficient data retrieval ✅ CID rotation and versioning for updated datasets ✅ Retry mechanism for failed decentralized storage uploads ✅ Data integrity validation using SHA-256 hashes

🔧 Implementation Details

Core Components

  1. AES Encryption Module (shared/src/encryption/aes.ts)

    • AES-256-GCM encryption/decryption
    • Streaming decryption for large files
    • Key management utilities
    • Integrity verification

  2. Storage Management (shared/src/encryption/storage.ts)

    • CID versioning and rotation
    • Retry mechanism with exponential backoff
    • Stellar ledger integration
    • Data integrity validation

  3. Blob Storage Adapter (shared/src/encryption/blob-storage.ts)

    • Main storage adapter class
    • IPFS/Pinata integration
    • End-to-end encryption flow
    • Error handling and recovery

  4. API Routes (backend/src/routes/ipfs.ts)

    • RESTful API endpoints
    • Request validation
    • Error handling
    • Streaming support

Key Features

🔐 Security & Encryption

  • AES-256-GCM: Industry-standard authenticated encryption
  • Random IV Generation: Unique initialization vectors for each operation
  • Auth Tag Verification: Ensures data integrity and authenticity
  • Key Management: Secure key generation, storage, and rotation

🌐 Decentralized Storage

  • IPFS Integration: Support for local nodes and public gateways
  • Pinata API: Commercial pinning service support
  • Content Addressing: Automatic CID generation and management
  • Fallback Mechanisms: Multiple storage options for reliability

⚡ Performance & Reliability

  • Streaming Decryption: Memory-efficient processing of large files
  • Retry Logic: Exponential backoff for failed operations
  • Version Management: Complete dataset versioning history
  • Error Recovery: Comprehensive error handling

📋 Ledger Integration

  • Stellar Storage: Immutable CID storage on blockchain
  • Metadata Tracking: Additional dataset information
  • Audit Trail: Complete transaction history
  • Verification: CID existence verification

📁 Files Added/Modified

New Files

shared/src/encryption/
├── aes.ts                    # AES-256-GCM encryption utilities
├── storage.ts                # Storage management and versioning
├── blob-storage.ts           # Main storage adapter
└── __tests__/
    └── blob-storage.test.ts  # Comprehensive test suite

backend/src/middleware/
└── validation.ts             # Request validation middleware

docs/
└── encrypted-blob-storage.md # Comprehensive documentation

Modified Files

shared/src/encryption/index.ts    # Export new modules
shared/package.json                # Add new dependencies
backend/src/routes/ipfs.ts         # Add encrypted storage routes

🚀 Usage Examples

Basic Upload/Download

const storageAdapter = new EncryptedBlobStorageAdapter(config, keyManager);

// Upload encrypted data
const result = await storageAdapter.uploadEncrypted(
  Buffer.from('Sensitive data'),
  {
    datasetId: 'analytics-2024',
    storeOnLedger: true
  }
);

// Download and decrypt
const decrypted = await storageAdapter.downloadEncrypted(
  result.cid,
  result.encryptionKeyId
);

API Endpoints

# Upload encrypted data
POST /api/v1/ipfs/encrypted/upload

# Download encrypted data
GET /api/v1/ipfs/encrypted/download/{cid}

# Stream decryption
GET /api/v1/ipfs/encrypted/stream/{cid}

# Rotate CID version
POST /api/v1/ipfs/encrypted/rotate/{datasetId}

🧪 Testing

Comprehensive test suite covering:

  • ✅ AES encryption/decryption operations
  • ✅ Streaming decryption for large files
  • ✅ Key management and rotation
  • ✅ CID versioning and management
  • ✅ Retry mechanisms
  • ✅ Integrity validation
  • ✅ Stellar ledger integration
  • ✅ End-to-end storage flows

🔒 Security Considerations

  • Encryption: AES-256-GCM provides confidentiality and integrity
  • Key Management: Secure key generation and rotation
  • Data Integrity: SHA-256 hash verification
  • Audit Trail: Stellar ledger provides immutable records
  • Error Handling: No data leakage in error messages

📊 Performance

  • Streaming: Memory-efficient processing of large files
  • Concurrent Operations: Parallel processing where possible
  • Caching: In-memory caching for frequently accessed data
  • Retry Logic: Exponential backoff prevents system overload

🔄 Breaking Changes

None. This is a pure addition that doesn't modify existing functionality.

📋 Dependencies Added

{
  "ipfs-http-client": "^60.0.1",
  "axios": "^1.6.2",
  "form-data": "^4.0.0",
  "@types/node": "^20.10.0",
  "@types/form-data": "^4.0.1"
}

🎉 Impact

This implementation provides:

  • Enhanced Security: End-to-end encryption for all stored data
  • Decentralized Storage: IPFS/Filecoin integration for data sovereignty
  • Blockchain Integration: Immutable audit trail on Stellar
  • Scalability: Streaming support for large datasets
  • Reliability: Comprehensive error handling and retry logic
  • Compliance: Privacy-first architecture with audit capabilities

📖 Documentation

Complete documentation available at docs/encrypted-blob-storage.md including:

  • Installation instructions
  • Usage examples
  • API reference
  • Security considerations
  • Performance optimization
  • Deployment guides

✅ Verification

All requirements from issue #16 have been implemented and tested:

  • AES-256-GCM encryption implemented
  • IPFS/Filecoin integration complete
  • Stellar ledger CID storage functional
  • Streaming decryption buffer implemented
  • CID rotation and versioning working
  • Retry mechanism with exponential backoff
  • SHA-256 integrity validation
  • Comprehensive test suite
  • Complete documentation

This implementation is production-ready and addresses all specified requirements with enterprise-grade security and reliability features.