return err
		}

		if len(cryptoCtx) == 0 {
			_, _, _, cryptoCtx, err = crypto.S3KMS.ParseMetadata(metadata)
			if err != nil {
				return err
			}
		}

		// If the context does not contain the bucket key
		// we must add it for key generation. However,
		// the context must be stored exactly like the
		// client provided it. Therefore, we create a copy
		// of the client provided context and add the bucket