96 lines
2.0 KiB
Go
96 lines
2.0 KiB
Go
package vault
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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/hex"
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"errors"
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"fmt"
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"strings"
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"golang.org/x/crypto/argon2"
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)
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const (
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argonTime = 3
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argonMemory = 64 * 1024
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argonThreads = 4
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argonKeyLen = 32
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)
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func DeriveKey(password string, salt []byte) []byte {
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return argon2.IDKey([]byte(password), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
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}
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func GenerateSalt() ([]byte, error) {
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salt := make([]byte, 32)
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if _, err := rand.Read(salt); err != nil {
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return nil, fmt.Errorf("generate salt: %w", err)
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}
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return salt, nil
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}
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type VaultService struct {
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key []byte
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}
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func NewVaultService(key []byte) *VaultService {
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return &VaultService{key: key}
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}
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func (v *VaultService) Encrypt(plaintext string) (string, error) {
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block, err := aes.NewCipher(v.key)
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if err != nil {
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return "", fmt.Errorf("create 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("create GCM: %w", err)
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}
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iv := make([]byte, gcm.NonceSize())
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if _, err := rand.Read(iv); err != nil {
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return "", fmt.Errorf("generate IV: %w", err)
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}
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sealed := gcm.Seal(nil, iv, []byte(plaintext), nil)
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return fmt.Sprintf("v1:%s:%s", hex.EncodeToString(iv), hex.EncodeToString(sealed)), nil
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}
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func (v *VaultService) Decrypt(encrypted string) (string, error) {
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parts := strings.SplitN(encrypted, ":", 3)
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if len(parts) != 3 || parts[0] != "v1" {
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return "", errors.New("invalid encrypted format: expected v1:{iv}:{sealed}")
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}
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iv, err := hex.DecodeString(parts[1])
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if err != nil {
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return "", fmt.Errorf("decode IV: %w", err)
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}
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sealed, err := hex.DecodeString(parts[2])
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if err != nil {
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return "", fmt.Errorf("decode sealed data: %w", err)
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}
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block, err := aes.NewCipher(v.key)
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if err != nil {
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return "", fmt.Errorf("create 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("create GCM: %w", err)
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}
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plaintext, err := gcm.Open(nil, iv, sealed, 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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