vikingowl
a89720fded
Add full LLM configuration section to the setup page with provider dropdown, model/API key fields for cloud providers (Anthropic, OpenAI, Gemini), and endpoint/model fields for Ollama. API keys are encrypted with AES-256-GCM and stored in the database.
100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
package config
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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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"io"
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"os"
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"path/filepath"
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)
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const keyFileName = "encryption.key"
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// keyPath returns the full path to the encryption key file.
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func keyPath() string {
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return filepath.Join(ConfigDir(), keyFileName)
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}
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// loadOrCreateKey reads the 32-byte AES key, creating it if absent.
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func loadOrCreateKey() ([]byte, error) {
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path := keyPath()
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data, err := os.ReadFile(path)
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if err == nil && len(data) == 32 {
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return data, nil
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}
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key := make([]byte, 32)
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if _, err := io.ReadFull(rand.Reader, key); err != nil {
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return nil, fmt.Errorf("generate key: %w", err)
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}
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if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
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return nil, fmt.Errorf("create config dir: %w", err)
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}
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if err := os.WriteFile(path, key, 0o600); err != nil {
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return nil, fmt.Errorf("write key file: %w", err)
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}
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return key, nil
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}
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// Encrypt encrypts plaintext using AES-256-GCM and returns a base64 string.
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func Encrypt(plaintext string) (string, error) {
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if plaintext == "" {
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return "", nil
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}
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key, err := loadOrCreateKey()
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", fmt.Errorf("new cipher: %w", err)
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", fmt.Errorf("new gcm: %w", err)
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return "", fmt.Errorf("generate nonce: %w", err)
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}
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ciphertext := gcm.Seal(nonce, nonce, []byte(plaintext), nil)
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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// Decrypt decrypts a base64 AES-256-GCM ciphertext back to plaintext.
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func Decrypt(encoded string) (string, error) {
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if encoded == "" {
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return "", nil
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}
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key, err := loadOrCreateKey()
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if err != nil {
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return "", err
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}
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ciphertext, err := base64.StdEncoding.DecodeString(encoded)
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if err != nil {
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return "", fmt.Errorf("decode base64: %w", err)
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", fmt.Errorf("new cipher: %w", err)
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", fmt.Errorf("new 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 "", fmt.Errorf("ciphertext too short")
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}
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nonce, ct := ciphertext[:nonceSize], ciphertext[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, ct, nil)
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if err != nil {
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return "", fmt.Errorf("decrypt: %w", err)
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}
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return string(plaintext), nil
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}
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