(Ruby) Duplicate Java Verify RSA Signature

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

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# 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 = Chilkat::CkCert.new()
success = cert.LoadFromBase64(base64Certificate)
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

rsa = Chilkat::CkRsa.new()

success = rsa.SetX509Cert(cert,false)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

rsa.put_EncodingMode("base64")
success = rsa.VerifyStringENC(base64DataToBeSigned,"sha256",base64Signature)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

print "Signature verified." + "\n";