}
	}

	if n := len(encryptedKey.Nonce); n != aead.NonceSize() {
		return nil, Error{
			HTTPStatusCode: http.StatusBadRequest,
			APICode:        "KMS.InternalException",
			Err:            fmt.Errorf("invalid nonce size %d", n),
		}
	}

	associatedData, _ := context.MarshalText()
	plaintext, err := aead.Open(nil, encryptedKey.Nonce, encryptedKey.Bytes, associatedData)
	if err != nil {