question: public boolean validate ( String cert , String signedData , String signature ) throws NoSuchAlgorithmException , IOException , Exception { byte [ ] certBytes = Base64 . decode ( cert ) ; byte [ ] signedDataBytes = Base64 . decode ( signedData ) ; byte [ ] signatureBytes = Base64 . decode ( signature ) ; return validate ( certBytes , signedDataBytes , signatureBytes ) ; }
target:  Example implementation. It only knows to verify SHA256withEC algorithm.