Examples of java.security.Signature.verify()

java.security.Signature.verify()
Verifies the passed-in signature.
A call to this method resets this signature object to the state it was in when previously initialized for verification via a call to initVerify(PublicKey). That is, the object is reset and available to verify another signature from the identity whose public key was specified in the call to initVerify. @param signature the signature bytes to be verified. @return true if the signature was verified, false if not. @exception SignatureException if this signature object is not initialized properly, the passed-in signature is improperly encoded or of the wrong type, if this signature algorithm is unable to process the input data provided, etc.

        String algo = validatingKey.getAlgorithm();
        Signature sig = getSignature(algo);


        sig.initVerify(validatingKey);
        sig.update(signedContent);
        return sig.verify(signatureValue);
    }


    private Signature getSignature(String algo) throws GeneralSecurityException {
        Signature sig = null;

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            // verify the identity of the server
            Signature sig = Signature.getInstance("SHA1with"+serverKeyAlgorithm);
            sig.initVerify(spk);
            sig.update(spk.getEncoded());
            sig.update(sharedSecret);
            sig.verify((byte[]) readObject());


            return spk;
        } catch (ClassNotFoundException e) {
            throw new Error(e); // impossible
        }

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        try {
            Signature sig = Signature.getInstance(curve.defaultHashAlgorithm, curve.sigProvider);
            sig.initVerify(key);
      for(byte[] d: data)
        sig.update(d);
            result = sig.verify(signature, sigoffset, siglen);
        } catch (NoSuchAlgorithmException e) {
            Logger.error(ECDSA.class, "NoSuchAlgorithmException : "+e.getMessage(),e);
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            Logger.error(ECDSA.class, "InvalidKeyException : "+e.getMessage(),e);

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            try {
                Signature s = Signature.getInstance(algorithm);
                s.initVerify(chain[0]);
                s.update(message);
                return s.verify(signature);
            } catch (Exception ex) {
                LogRecord lr = new LogRecord(Level.WARNING, "Error while verifing message of user {0}");
                lr.setParameters(new Object[]{username});
                lr.setThrown(ex);
                log.log(lr);

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        }


        rawSig.initVerify(pubKey);
        rawSig.update(digInfo);


        if (!rawSig.verify(rawResult))
        {
            fail("raw mode signature verification failed");
        }
    }

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        s = Signature.getInstance("SHA1withRSAandMGF1", "BC");
        
        s.initVerify(pubKey);
        s.update(msg1a);
        if (!s.verify(sig1a))
        {
            fail("SHA1 signature verification failed");
        }


        s = Signature.getInstance("SHA1withRSAandMGF1", "BC");

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        s.setParameter(PSSParameterSpec.DEFAULT);
        
        s.initVerify(pubKey);
        s.update(msg1a);
        if (!s.verify(sig1a))
        {
            fail("SHA1 signature verification with default parameters failed");
        }
        
        AlgorithmParameters pss = s.getParameters();

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        sgr.initVerify(vKey);


        sgr.update(message);


        if (!sgr.verify(sigBytes))
        {
            fail("ECGOST3410 verification failed");
        }


        BigInteger[]  sig = decode(sigBytes);

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        s.initVerify(vKey);


        s.update(data);


        if (!s.verify(sigBytes))
        {
            fail("GOST3410 verification failed");
        }


        //

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        s.initVerify(vKey);


        s.update(data);


        if (!s.verify(sigBytes))
        {
            fail("GOST3410 verification failed");
        }


        //

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