Spire.Cloud.Word provides the DigitalSignatureApi interface to add digital signature to Word. This tutorial will introduce how to do it using Java codes.

import spire.cloud.word.sdk.client.*;
import spire.cloud.word.sdk.client.api.DigitalSignatureApi;
import java.io.File;

public class DigitalSignature {
    static String appId = "App ID";
    static String appKey = "App Key";
    static String baseUrl = "https://api.cloudxdocs.com";
    //Create a Configuration object based on your App ID and App Key
    static Configuration wordConfiguration = new Configuration(appId, appKey, baseUrl);
    //Initialize the DigitalSignatureApi object
    static DigitalSignatureApi digitalsignatureApi = new DigitalSignatureApi(wordConfiguration);

    public static void main(String[] args) throws ApiException {
        //Load a Word document 
        String name = "Sample.docx";
       //Load a .pfx file to add digital signature
        File pfxFile = new File("C:\\Users\\Test1\\Desktop\\gary.pfx");
       //Set a password
        String pfxFilePassword = "e-iceblue";
        //Specify the folder storing the sample, it’s null if nothing
        String folder = "input";
        //Use the 2G storage provided by E-iceblue Cloud, it’s null by default
        String storage = null;
        //Specify the password used to open the sample, it's null if nothing
        String docPassword = null;
        //Specify the path of the resulting document
        String destFilePath = "output/addDigitalSignature.docx";
        //Call the addDigitalSignature method to add digital signature to Word 
        digitalsignatureApi.addDigitalSignature(name, pfxFile, pfxFilePassword, destFilePath, folder, storage, docPassword);
    }
}

Output