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Duplicate Java Verify RSA Signature

See more RSA Examples

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

Local $bSuccess = False

;  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);  
;      }  
;  } 

Local $sBase64DataToBeSigned = "Hlp...LE4="
Local $sBase64Certificate = "MII...TlQ=="
Local $sBase64Signature = "I00...pZA=="

$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadFromBase64($sBase64Certificate)
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

$oRsa = ObjCreate("Chilkat.Rsa")

$bSuccess = $oRsa.SetX509Cert($oCert,False)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

$oRsa.EncodingMode = "base64"
$bSuccess = $oRsa.VerifyStringENC($sBase64DataToBeSigned,"sha256",$sBase64Signature)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Signature verified." & @CRLF)