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 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 {

			cfg.Azure.SPAuth.ClientSecret = creds.AzSP.ClientSecret
		}
	case madmin.GCS:
		if creds.CredsJSON == nil {
			return errTierMissingCredentials
		}
		cfg.GCS.Creds = base64.URLEncoding.EncodeToString(creds.CredsJSON)
	case madmin.MinIO:
		if creds.AccessKey == "" || creds.SecretKey == "" {
			return errTierMissingCredentials
		}
		cfg.MinIO.AccessKey = creds.AccessKey
		cfg.MinIO.SecretKey = creds.SecretKey

				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 {

    /**
     * Create ID.
     * @param key Key
     * @param value Value
     * @return ID
     */
    protected String createId(final String key, final Object value) {
        return encoder.encodeToString(("key:" + key + "value:" + value).getBytes(CoreLibConstants.CHARSET_UTF_8));
    }

    /**
     * Get values from array index.
     * @param index Index
     * @param type Type
     * @param key Key

		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 := ""

	}

	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.

     */
    public static String base64(final String value) {
        if (value == null) {
            return StringUtil.EMPTY;
        }
        return Base64.getUrlEncoder().encodeToString(value.getBytes(Constants.CHARSET_UTF_8));
    }

    /**
     * Checks if a file exists at the specified path within the servlet context.
     *
     * @param path the file path relative to the servlet context

	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,

		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 := min(runtime.GOMAXPROCS(0), 100)

		fanOutResp := make([]minio.PutObjectFanOutResponse, 0, len(fanOutEntries))
		eventArgsList := make([]eventArgs, 0, len(fanOutEntries))