Hi I am trying to validate signature in the secure QR code but I am getting false value. I used the above certificates and [uidai_12_06_18_cer.cer](https://www.uidai.gov.in/images/authDoc/uidai_12_06_18_cer.cer).

[UgandharTalari]

Hi I am trying to validate signature in the secure QR code but I am getting false value. I used the above certificates and uidai_12_06_18_cer.cer.

code of getting signature value__
for(int i=0,j = output.length-1; i<256 & j >= output.length-256 ; i++,j--){
signArray[i] = output[j];
}
END__

signature verification method
Signature signature = Signature.getInstance("SHA256withRSA");
InputStream in = getAssets().open("uidai.cer");
CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
X509Certificate cer = (X509Certificate) certFactory.generateCertificate(in);
PublicKey publicKey = cer.getPublicKey();
in.close();
signature.initVerify(publicKey);
signature.update(dataSigned);
isVerified = signature.verify(signArray);
END__
I followed same validation steps given in the UIDAI pdf https://uidai.gov.in/images/resource/User_manulal_QR_Code_15032019.pdf.
can any help me to figure out the mistake I am making.
Thanks in advance.

Originally posted by @UgandharTalari in #6 (comment)