Sign a File to Create a .p7m File

Java example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Download Chilkat Java Library

Download Chilkat Java x64 Library

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkCrypt2 crypt = new CkCrypt2();

    //  Any string argument automatically begins the 30-day trial.
    boolean success;
    success = crypt.UnlockComponent("30-day trial");
    if (success != true) {
        System.out.println("Crypt component unlock failed");
        return;
    }

    //  Find our digital certificate from the Current User certificate store.
    CkCreateCS ccs = new CkCreateCS();
    CkCertStore certStore;
    certStore = ccs.OpenCurrentUserStore();
    CkCert cert;
    cert = certStore.FindCertBySubjectCN("Chilkat Software, Inc.");
    if (cert == null ) {
        System.out.println(cert.lastErrorText());

        return;
    }

    //  Tell the crypt component to use this cert.
    crypt.SetSigningCert(cert);

    //  We can sign any type of file, creating a .p7s as output:
    success = crypt.CreateP7M("test.xml","test.p7m");
    if (success == false) {
        System.out.println(crypt.lastErrorText());

        return;
    }

    //  Verify and restore the original file:
    crypt.SetVerifyCert(cert);

    success = crypt.VerifyP7M("test.p7m","testRestored.xml");
    if (success == false) {
        System.out.println(crypt.lastErrorText());

        return;
    }

    System.out.println("Success!");
  }
}