100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
package service
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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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"crypto/sha256"
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"encoding/base64"
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"strings"
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)
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const developmentSecretEnvelopeKey = "browser.local/platform/development-secret-envelope/v1"
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type SecretEnvelope interface {
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Seal(string) (string, error)
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Open(string) (string, error)
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}
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type aesGCMSecretEnvelope struct {
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key [32]byte
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}
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func newSecretEnvelope(secret string) *aesGCMSecretEnvelope {
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return &aesGCMSecretEnvelope{key: sha256.Sum256([]byte(secret))}
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}
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func (envelope *aesGCMSecretEnvelope) Seal(plain string) (string, error) {
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block, err := aes.NewCipher(envelope.key[:])
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if err != nil {
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return "", 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 "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := rand.Read(nonce); err != nil {
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return "", err
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}
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ciphertext := gcm.Seal(nil, nonce, []byte(plain), nil)
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return "enc:v1:" + base64.RawURLEncoding.EncodeToString(nonce) + ":" + base64.RawURLEncoding.EncodeToString(ciphertext), nil
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}
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func (envelope *aesGCMSecretEnvelope) Open(encrypted string) (string, error) {
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parts := strings.Split(encrypted, ":")
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if len(parts) != 4 || parts[0] != "enc" || parts[1] != "v1" {
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return "", validationError("encrypted key format is invalid")
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}
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nonce, err := base64.RawURLEncoding.DecodeString(parts[2])
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if err != nil {
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return "", err
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}
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ciphertext, err := base64.RawURLEncoding.DecodeString(parts[3])
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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(envelope.key[:])
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if err != nil {
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return "", 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 "", err
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}
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plain, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return "", err
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}
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return string(plain), nil
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}
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func (svc *CoreService) ConfigureSecretEnvelopeKey(secret string) error {
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secret = strings.TrimSpace(secret)
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if secret == "" {
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return nil
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}
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if len([]rune(secret)) < 32 {
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return validationError("PLATFORM_SECRET_ENVELOPE_KEY must be at least 32 characters")
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}
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svc.secretEnvelope = newSecretEnvelope(secret)
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svc.networkFingerprintKey = []byte(secret)
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return nil
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}
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func (svc *CoreService) encryptRuntimeKey(plain string) (string, error) {
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return svc.secretEnvelope.Seal(plain)
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}
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func (svc *CoreService) decryptRuntimeKey(encrypted string) (string, error) {
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return svc.secretEnvelope.Open(encrypted)
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}
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func encryptRuntimeKey(plain string) (string, error) {
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return newSecretEnvelope(developmentSecretEnvelopeKey).Seal(plain)
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}
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func decryptRuntimeKey(encrypted string) (string, error) {
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return newSecretEnvelope(developmentSecretEnvelopeKey).Open(encrypted)
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}
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