(Chilkat2-Python) Duplicate Java Verify RSA Signature

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

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

# 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);  
#     }  
# } 

base64DataToBeSigned = "Hlp...LE4="
base64Certificate = "MII...TlQ=="
base64Signature = "I00...pZA=="

cert = chilkat2.Cert()
success = cert.LoadFromBase64(base64Certificate)
if (success == False):
    print(cert.LastErrorText)
    sys.exit()

rsa = chilkat2.Rsa()

success = rsa.SetX509Cert(cert,False)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

rsa.EncodingMode = "base64"
success = rsa.VerifyStringENC(base64DataToBeSigned,"sha256",base64Signature)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

print("Signature verified.")