hh, _ := highwayhash.New(magicHighwayHash256Key) // New will never return error since key is 256 bit
				hh.Write([]byte(key))
				hashBytes := hh.Sum(nil)
				keyHash = base64.URLEncoding.EncodeToString(hashBytes)
			} else {
				keyHash = key
			}
		}

		if eventData.EventName == event.ObjectRemovedDelete {
			err = target.client.removeEntry(ctx, target.args.Index, keyHash)
		} else {

	expirationTime := UTCNow().Add(time.Minute * 5)
	// Create a new post policy.
	policy := newPostPolicyBytesV2(bucketName, objectName, expirationTime)
	// Only need the encoding.
	encodedPolicy := base64.StdEncoding.EncodeToString(policy)

	// Presign with V4 signature based on the policy.
	signature := calculateSignatureV2(encodedPolicy, secretKey)

	formData := map[string]string{
		"bucket":    bucketName,

	}
	return ErrNone
}

func calculateSignatureV2(stringToSign string, secret string) string {
	hm := hmac.New(sha1.New, []byte(secret))
	hm.Write([]byte(stringToSign))
	return base64.StdEncoding.EncodeToString(hm.Sum(nil))
}

// Return signature-v2 for the presigned request.
func preSignatureV2(cred auth.Credentials, method string, encodedResource string, encodedQuery string, headers http.Header, expires string) string {

		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

		// Set the correct hex md5sum for the fan-out stream.
		fanOutOpts.MD5Hex = hex.EncodeToString(md5w.Sum(nil))

		concurrentSize := 100
		if runtime.GOMAXPROCS(0) < concurrentSize {
			concurrentSize = runtime.GOMAXPROCS(0)
		}

	region := sumHMAC(date, []byte(globalMinioDefaultRegion))
	service := sumHMAC(region, []byte(string(serviceS3)))
	signingKey := sumHMAC(service, []byte("aws4_request"))

	signature := hex.EncodeToString(sumHMAC(signingKey, []byte(stringToSign)))

	// final Authorization header
	parts := []string{
		"AWS4-HMAC-SHA256" + " Credential=" + accessKey + SlashSeparator + scope,
		"SignedHeaders=" + signedHeaders,

	return trace
}

// HashString - return the highway hash of the passed string
func HashString(input string) string {
	hh, _ := highwayhash.New(magicHighwayHash256Key)
	hh.Write([]byte(input))
	return hex.EncodeToString(hh.Sum(nil))
}

// LogAlwaysIf prints a detailed error message during
// the execution of the server.
func LogAlwaysIf(ctx context.Context, subsystem string, err error, errKind ...interface{}) {
	if err == nil {

	// policies shouldn't exceed maxSTSSessionPolicySize characters.
	if len(policyBuf) > maxSTSSessionPolicySize {
		return errSessionPolicyTooLarge
	}

	c[policy.SessionPolicyName] = base64.StdEncoding.EncodeToString(policyBuf)
	return nil
}

// stsAPIHandlers implements and provides http handlers for AWS STS API.
type stsAPIHandlers struct{}

// registerSTSRouter - registers AWS STS compatible APIs.

	data.Delimiter = s3EncodeName(delimiter, encodingType)
	data.Prefix = s3EncodeName(prefix, encodingType)
	data.MaxKeys = maxKeys
	data.ContinuationToken = base64.StdEncoding.EncodeToString([]byte(token))
	data.NextContinuationToken = base64.StdEncoding.EncodeToString([]byte(nextToken))
	data.IsTruncated = isTruncated

	commonPrefixes := make([]CommonPrefix, 0, len(prefixes))
	for _, prefix := range prefixes {

	}

	key := make([]byte, base64.RawStdEncoding.DecodedLen(length))
	if _, err := io.ReadFull(random, key); err != nil {
		return "", err
	}

	s := base64.RawStdEncoding.EncodeToString(key)
	return strings.ReplaceAll(s, "/", "+"), nil
}

// GetNewCredentialsWithMetadata generates and returns new credential with expiry.

		if format == nil {
			continue
		}
		h := sha256.New()
		for _, set := range format.Erasure.Sets {
			for _, diskID := range set {
				h.Write([]byte(diskID))
			}
		}
		formatHashes[i] = hex.EncodeToString(h.Sum(nil))
	}

	formatCountMap := make(map[string]int)
	for _, hash := range formatHashes {
		if hash == "" {
			continue
		}
		formatCountMap[hash]++
	}

	maxHash := ""