Java

Sign a Byte Array to Create a Detached Signature in a Byte Array

See more Digital Signatures Examples

Signs data contained in a byte array to produce a detached signature (also in a byte array). Also shows how to verify the signature. Java

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[])
  {
    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkCert cert = new CkCert();
    success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkFileAccess fac = new CkFileAccess();

    CkByteData fileBytes = new CkByteData();
    success = fac.ReadEntireFile("qa_data/pdf/sample.pdf",fileBytes);
    if (fac.get_LastMethodSuccess() != true) {
        System.out.println(fac.lastErrorText());
        return;
        }

    CkCrypt2 crypt = new CkCrypt2();

    success = crypt.SetSigningCert(cert);

    //  We can sign any type of file.
    //  The result is a detached signature (a signature that does not contain the data being signed).

    CkByteData sigBytes = new CkByteData();
    success = crypt.SignBytes(fileBytes,sigBytes);
    if (crypt.get_LastMethodSuccess() != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    success = fac.WriteEntireFile("qa_output/sample.pdf.p7s",sigBytes);
    if (fac.get_LastMethodSuccess() != true) {
        System.out.println(fac.lastErrorText());
        return;
        }

    //  We can verify the detached signature like this
    boolean verified = crypt.VerifyBytes(fileBytes,sigBytes);
    if (crypt.get_LastMethodSuccess() != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    System.out.println("Verified = " + verified);
  }
}