PowerBuilder

Duplicate Java Verify RSA Signature

See more RSA Examples

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

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

li_Success = 0

//  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
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
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