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

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!");
  }
}