return kmsID
	}
	return ARNPrefix + kmsID
}

// DecryptETags decryptes the ETag of all ObjectInfos using the KMS.
//
// It adjusts the size of all encrypted objects since encrypted
// objects are slightly larger due to encryption overhead.
// Further, it decrypts all single-part SSE-S3 encrypted objects
// and formats ETags of SSE-C / SSE-KMS encrypted objects to
// be AWS S3 compliant.
//

// A chunk has the following format:
//
//	<chunk-size-as-hex> + ";chunk-signature=" + <signature-as-hex> + "\r\n" + <payload> + "\r\n"
//
// First, we read the chunk size but fail if it is larger
// than 16 MiB. We must not accept arbitrary large chunks.
// One 16 MiB is a reasonable max limit.
//
// Then we read the signature and payload data. We compute the SHA256 checksum

func optimalPartSize(objectSize int64) (partSize int64, err error) {
	// object size is '-1' set it to 5TiB.
	if objectSize == -1 {
		objectSize = maxMultipartPutObjectSize
	}

	// object size is larger than supported maximum.
	if objectSize > maxMultipartPutObjectSize {
		err = errors.New("entity too large")
		return
	}

	configuredPartSize := minPartSize
	// Use floats for part size for all calculations to avoid

	if err != nil {
		return nil, err
	}

	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	if accessToken != "" {
		req.Header.Set("Authorization", "Bearer "+accessToken)
	}

	client := &http.Client{
		Transport: transport,
	}

	resp, err := client.Do(req)
	if err != nil {
		return nil, err
	}

	defer xhttp.DrainBody(resp.Body)

var errSignatureMismatch = errors.New("Signature does not match")

// When upload object size is greater than 5G in a single PUT/POST operation.
var errDataTooLarge = errors.New("Object size larger than allowed limit")

// When upload object size is less than what was expected.
var errDataTooSmall = errors.New("Object size smaller than expected")

// errServerNotInitialized - server not initialized.

		{bucketNames[0], objectNames[0], uploadIDs[0], 4, "mnop", "e132e96a5ddad6da8b07bba6f6131fef", int64(len("abcd"))},
		// Part with size larger than 5Mb.
		{bucketNames[0], objectNames[0], uploadIDs[0], 5, string(validPart), validPartMD5, int64(len(validPart))},
		{bucketNames[0], objectNames[0], uploadIDs[0], 6, string(validPart), validPartMD5, int64(len(validPart))},

	if err = checkPathLength(filePath); err != nil {
		return err
	}

	flags := os.O_CREATE | os.O_WRONLY | os.O_TRUNC

	var w *os.File
	if sync {
		// Perform DirectIO along with fdatasync for larger xl.meta, mostly when
		// xl.meta has "inlined data" we prefer writing O_DIRECT and then doing
		// fdatasync() at the end instead of opening the file with O_DSYNC.
		//

//     kmskey: "key-id" # match objects with KMS key-id (applicable only for sse-kms)
//   notify:
//     endpoint: "https://notify.endpoint" # notification endpoint to receive job status events
//     token: "Bearer xxxxx" # optional authentication token for the notification endpoint

//   retry:
//     attempts: 10 # number of retries for the job before giving up
//     delay: "500ms" # least amount of delay between each retry

//           # retainVersions: 5 # keep the latest 5 versions of the object including delete markers.
//
//   notify:
//     endpoint: https://notify.endpoint # notification endpoint to receive job completion status
//     token: Bearer xxxxx # optional authentication token for the notification endpoint
//
//   retry:
//     attempts: 10 # number of retries for the job before giving up
//     delay: 500ms # least amount of delay between each retry

		dialer.Timeout = defaultDialTimeout
		if c.dialer != nil {
			dialer.NetDial = c.dialer.DialContext
		}
		if c.header == nil {
			c.header = make(http.Header, 2)
		}
		c.header.Set("Authorization", "Bearer "+c.auth(""))
		c.header.Set("X-Minio-Time", time.Now().UTC().Format(time.RFC3339))

		if len(c.header) > 0 {
			dialer.Header = ws.HandshakeHeaderHTTP(c.header)
		}
		dialer.TLSConfig = c.tlsConfig