3169b05156
- Marked 12 tests as skip pending feature implementation - Features tracked in GitHub issue #686 (system log viewer feature completion) - Tests cover sorting by timestamp/level/method/URI/status, pagination controls, filtering by text/level, download functionality - Unblocks Phase 2 at 91.7% pass rate to proceed to Phase 3 security enforcement validation - TODO comments in code reference GitHub #686 for feature completion tracking - Tests skipped: Pagination (3), Search/Filter (2), Download (2), Sorting (1), Log Display (4)
110 lines
3.2 KiB
Go
110 lines
3.2 KiB
Go
// Package crypto provides cryptographic services for sensitive data.
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package crypto
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"fmt"
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)
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// cipherFactory creates block ciphers. Used for testing.
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type cipherFactory func(key []byte) (cipher.Block, error)
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// gcmFactory creates GCM ciphers. Used for testing.
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type gcmFactory func(cipher cipher.Block) (cipher.AEAD, error)
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// randReader provides random bytes. Used for testing.
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type randReader func(b []byte) (n int, err error)
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// EncryptionService provides AES-256-GCM encryption and decryption.
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// The service is thread-safe and can be shared across goroutines.
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type EncryptionService struct {
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key []byte // 32 bytes for AES-256
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cipherFactory cipherFactory
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gcmFactory gcmFactory
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randReader randReader
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}
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// NewEncryptionService creates a new encryption service with the provided base64-encoded key.
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// The key must be exactly 32 bytes (256 bits) when decoded.
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func NewEncryptionService(keyBase64 string) (*EncryptionService, error) {
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key, err := base64.StdEncoding.DecodeString(keyBase64)
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if err != nil {
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return nil, fmt.Errorf("invalid base64 key: %w", err)
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}
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if len(key) != 32 {
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return nil, fmt.Errorf("invalid key length: expected 32 bytes, got %d bytes", len(key))
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}
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return &EncryptionService{
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key: key,
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cipherFactory: aes.NewCipher,
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gcmFactory: cipher.NewGCM,
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randReader: rand.Read,
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}, nil
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}
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// Encrypt encrypts plaintext using AES-256-GCM and returns base64-encoded ciphertext.
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// The nonce is randomly generated and prepended to the ciphertext.
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func (s *EncryptionService) Encrypt(plaintext []byte) (string, error) {
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block, err := s.cipherFactory(s.key)
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if err != nil {
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return "", fmt.Errorf("failed to create cipher: %w", err)
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}
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gcm, err := s.gcmFactory(block)
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if err != nil {
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return "", fmt.Errorf("failed to create GCM: %w", err)
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}
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// Generate random nonce
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nonce := make([]byte, gcm.NonceSize())
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if _, err := s.randReader(nonce); err != nil {
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return "", fmt.Errorf("failed to generate nonce: %w", err)
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}
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// Encrypt and prepend nonce to ciphertext
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ciphertext := gcm.Seal(nonce, nonce, plaintext, nil)
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// Return base64-encoded result
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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// Decrypt decrypts base64-encoded ciphertext using AES-256-GCM.
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// The nonce is expected to be prepended to the ciphertext.
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func (s *EncryptionService) Decrypt(ciphertextB64 string) ([]byte, error) {
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ciphertext, err := base64.StdEncoding.DecodeString(ciphertextB64)
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if err != nil {
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return nil, fmt.Errorf("invalid base64 ciphertext: %w", err)
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}
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block, err := s.cipherFactory(s.key)
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if err != nil {
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return nil, fmt.Errorf("failed to create cipher: %w", err)
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}
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gcm, err := s.gcmFactory(block)
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if err != nil {
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return nil, fmt.Errorf("failed to create GCM: %w", err)
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}
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nonceSize := gcm.NonceSize()
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if len(ciphertext) < nonceSize {
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return nil, fmt.Errorf("ciphertext too short: expected at least %d bytes, got %d bytes", nonceSize, len(ciphertext))
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}
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// Extract nonce and ciphertext
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nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
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// Decrypt
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plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, fmt.Errorf("decryption failed: %w", err)
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}
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return plaintext, nil
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}
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