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872f21c8cd
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feat: Phase 4 Steps 1-2 - Encryption library (AES-256-GCM)
Implemented complete encryption infrastructure:
internal/crypto/interface.go:
- Encryptor interface with streaming encrypt/decrypt
- EncryptionConfig with key management (file/env var)
- EncryptionMetadata for backup metadata
- Support for AES-256-GCM algorithm
- KeyDeriver interface for PBKDF2
internal/crypto/aes.go:
- AESEncryptor implementation
- Streaming encryption (memory-efficient, 64KB chunks)
- AES-256-GCM authenticated encryption
- PBKDF2-SHA256 key derivation (600k iterations)
- Random nonce generation per chunk
- File and stream encryption/decryption
- Key validation (32-byte requirement)
Features:
✅ Streaming encryption (no memory bloat)
✅ Authenticated encryption (tamper detection)
✅ Secure key derivation (PBKDF2 + salt)
✅ Chunk-based encryption (64KB buffers)
✅ Nonce counter mode (prevents replay)
✅ File and stream APIs
✅ Clear error messages
internal/crypto/aes_test.go:
- Stream encryption/decryption tests
- File encryption/decryption tests
- Wrong key detection tests
- Key derivation tests
- Key validation tests
- Large data (1MB) tests
Test Results:
✅ TestAESEncryptionDecryption: PASS
✅ TestKeyDerivation: PASS (1.37s PBKDF2)
✅ TestKeyValidation: PASS
✅ TestLargeData: PASS (1MB streaming)
Security Properties:
- AES-256 (256-bit keys)
- GCM mode (authenticated encryption)
- PBKDF2 (600,000 iterations, OWASP compliant)
- Random nonces (cryptographically secure)
- 32-byte salt for key derivation
Status: CORE ENCRYPTION READY ✅
Next: CLI integration (--encrypt flags)
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2025-11-26 07:44:09 +00:00 |
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