(PowerBuilder) Duplicate Java Verify RSA Signature

Demonstrates how to duplicate a snippet of Java code that verifies an RSA signature.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
string ls_Base64DataToBeSigned
string ls_Base64Certificate
string ls_Base64Signature
oleobject loo_Cert
integer li_Success
oleobject loo_Rsa

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

// This example duplicates the following Java code:

// import com.sun.org.apache.xml.internal.security.utils.Base64;  
// import java.io.ByteArrayInputStream;  
// import java.security.PublicKey;  
// import java.security.Signature;  
// import java.security.cert.CertificateFactory;  
// import java.security.cert.X509Certificate;  
// public class validateSazetak {  
//   public static void main(String[] args) {  
//   String signatureAlgorithm = "SHA256withRSA";  
//   String base64DataToBeSigned = "Hlp...LE4=";  
//   String base64Certificate = "MII...TlQ==";  
//   String base64Signature = "I00...pZA==";  
//   try {  
//       CertificateFactory cf;  
//       X509Certificate certificate = null;  
//       cf = CertificateFactory.getInstance("X.509");  
//       certificate = (X509Certificate) cf.generateCertificate(new 
//       ByteArrayInputStream(Base64.decode(base64Certificate)));  
//        
//       Signature signature = Signature.getInstance(signatureAlgorithm, "SunRsaSign");  
//       PublicKey pk = (PublicKey) certificate.getPublicKey();  
//       signature.initVerify(pk);  
//        
//       byte[] hashBytes = Base64.decode(base64DataToBeSigned);  
//       signature.update(hashBytes);  
//        
//       byte[] sigBytes = Base64.decode(base64Signature);  
//       boolean validity = signature.verify(sigBytes);  
//       System.out.println("Is valid signature:" + validity);  
//     } catch (Exception e) {  
//         System.out.println(e);  
//     }  
// } 

ls_Base64DataToBeSigned = "Hlp...LE4="
ls_Base64Certificate = "MII...TlQ=="
ls_Base64Signature = "I00...pZA=="

loo_Cert = create oleobject
// Use "Chilkat_9_5_0.Cert" for versions of Chilkat < 10.0.0
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")
if li_rc < 0 then
    destroy loo_Cert
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_Cert.LoadFromBase64(ls_Base64Certificate)
if li_Success = 0 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Cert
    return
end if

loo_Rsa = create oleobject
// Use "Chilkat_9_5_0.Rsa" for versions of Chilkat < 10.0.0
li_rc = loo_Rsa.ConnectToNewObject("Chilkat.Rsa")

li_Success = loo_Rsa.SetX509Cert(loo_Cert,0)
if li_Success = 0 then
    Write-Debug loo_Rsa.LastErrorText
    destroy loo_Cert
    destroy loo_Rsa
    return
end if

loo_Rsa.EncodingMode = "base64"
li_Success = loo_Rsa.VerifyStringENC(ls_Base64DataToBeSigned,"sha256",ls_Base64Signature)
if li_Success = 0 then
    Write-Debug loo_Rsa.LastErrorText
    destroy loo_Cert
    destroy loo_Rsa
    return
end if

Write-Debug "Signature verified."


destroy loo_Cert
destroy loo_Rsa