JuliusBrussee/caveman · error

envelope: wrap data key: %w

Error message

envelope: wrap data key: %w

What it means

seal successfully encrypted the plaintext under a fresh data key, but secretbox.EncryptPayloadKey failed to wrap that data key with the KMS. The ciphertext is discarded — envelope encryption requires the key to be recoverable via the wrapped copy, so an unwrappable result must not be persisted.

Source

Thrown at shared/platform/envelope/envelope.go:90

		return nil, nil, fmt.Errorf("envelope: data key entropy: %w", err)
	}
	block, err := aes.NewCipher(dataKey)
	if err != nil {
		return nil, nil, fmt.Errorf("envelope: aes: %w", err)
	}
	gcm, err := cipher.NewGCM(block)
	if err != nil {
		return nil, nil, fmt.Errorf("envelope: gcm: %w", err)
	}
	nonce := make([]byte, gcm.NonceSize())
	if _, err := rand.Read(nonce); err != nil {
		return nil, nil, fmt.Errorf("envelope: nonce entropy: %w", err)
	}
	ciphertext = gcm.Seal(nonce, nonce, plaintext, aad)

	wrapped, err := secretbox.EncryptPayloadKey(dataKey)
	if err != nil {
		return nil, nil, fmt.Errorf("envelope: wrap data key: %w", err)
	}
	meta := Metadata{Scheme: scheme, WrappedDataKey: base64.StdEncoding.EncodeToString(wrapped), ScopeHash: scopeHash}
	metaJSON, err = json.Marshal(meta)
	if err != nil {
		return nil, nil, fmt.Errorf("envelope: marshal metadata: %w", err)
	}
	return ciphertext, metaJSON, nil
}

// Open reverses Seal: it unwraps the data key from metadata and decrypts the
// ciphertext. An unknown scheme fails closed.
func Open(ciphertext []byte, metaJSON []byte) ([]byte, error) {
	var meta Metadata
	if err := json.Unmarshal(metaJSON, &meta); err != nil {
		return nil, fmt.Errorf("envelope: parse metadata: %w", err)
	}
	if meta.Scheme == schemeV2 {
		return nil, fmt.Errorf("envelope: tenant scope required for scheme %q", meta.Scheme)

View on GitHub (pinned to 766dce6b13)

Solutions

1. Check KMS availability, credentials, and key URI
2. Retry the seal once the KMS is healthy

When it happens

Trigger: Thrown at shared/platform/envelope/envelope.go:90 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of JuliusBrussee/caveman@766dce6b13 (2026-08-18). Data as JSON: /api/errors/6510855f70d9a82f. Report an issue: GitHub.