return hex.EncodeToString(etag), nil
}

// For encrypted objects, the ETag sent by client if available
// is stored in encrypted form in the backend. Decrypt the ETag
// if ETag was previously encrypted.
func getDecryptedETag(headers http.Header, objInfo ObjectInfo, copySource bool) (decryptedETag string) {
	var (
		key [32]byte
		err error
	)
	// If ETag is contentMD5Sum return it as is.
	if len(objInfo.ETag) == 32 {

			if err != nil {
				// Call the cleanup funcs
				for i := len(cFns) - 1; i >= 0; i-- {
					cFns[i]()
				}
				return nil, err
			}

			oi.ETag = getDecryptedETag(h, oi, false)

			// Apply the skipLen and limit on the
			// decrypted stream
			decReader = io.LimitReader(xioutil.NewSkipReader(decReader, skipLen), decRangeLength)

			// Assemble the GetObjectReader