Translate Java to Python -- signing strings with PEM certificate files

Posted by erikcw on Stack Overflow See other posts from Stack Overflow or by erikcw
Published on 2010-04-15T02:53:11Z Indexed on 2010/04/15 3:03 UTC
Read the original article Hit count: 568

Filed under:

python

|

java

|

x509certificate

|

pem

|

fps

I'm trying to translate the follow Java into its Python equivalent.

 // certificate is contents of https://fps.sandbox.amazonaws.com/certs/090909/PKICert.pem
 // signature is a string that I need to verify.
 CertificateFactory factory = CertificateFactory.getInstance("X.509");
 X509Certificate x509Certificate = 
            (X509Certificate) factory.generateCertificate(new ByteArrayInputStream(certificate.getBytes()));
 Signature signatureInstance = Signature.getInstance(signatureAlgorithm);
 signatureInstance.initVerify(x509Certificate.getPublicKey());
 signatureInstance.update(stringToSign.getBytes(UTF_8_Encoding));
 return signatureInstance.verify(Base64.decodeBase64(signature.getBytes()));

This is for the PKI signature verification used by AWS FPS. http://docs.amazonwebservices.com/AmazonFPS/latest/FPSAccountManagementGuide/VerifyingSignature.html

Thanks for your help!

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