Examples of java.security.Signature.initVerify()

java.security.Signature.initVerify()
Initializes this object for verification. If this method is called again with a different argument, it negates the effect of this call. @param publicKey the public key of the identity whose signature isgoing to be verified. @exception InvalidKeyException if the key is invalid.

        // Verify the signature on SPKAC
        String signAlgString = PKCSObjectIdentifiers.md5WithRSAEncryption.equals(alg0) ? "MD5withRSA" :
                               PKCSObjectIdentifiers.md2WithRSAEncryption.equals(alg0) ? "MD2withRSA" :
                               PKCSObjectIdentifiers.sha1WithRSAEncryption.equals(alg0) ? "SHA1withRSA" : null;
        Signature signObj = Signature.getInstance(signAlgString);
        signObj.initVerify(pubKey);
        signObj.update(pkacSeq.getEncoded());
        boolean verified = signObj.verify(signature);
        if(!verified) throw new Exception("SignedPublicKeyAndChallenge verification failed.");
        map.put(CERT_REQ_PUBLICKEY, pkInfo);
        map.put(CERT_REQ_PUBLICKEY_OBJ, pubKey);

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            throw new IllegalStateException("need to set public key with " +
                                            " OAuthConsumer.setProperty when " +
                                            "verifying RSA-SHA1 signatures.");
        }
        Signature verifier = Signature.getInstance("SHA1withRSA");
        verifier.initVerify(publicKey);
        verifier.update(message);
        return verifier.verify(signature);
    }
    
    /**

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            throw new CRLException("Signature algorithm on CertificateList does not match TBSCertList.");
        }


        Signature sig = Signature.getInstance(getSigAlgName(), sigProvider);


        sig.initVerify(key);
        sig.update(this.getTBSCertList());
        if (!sig.verify(this.getSignature()))
        {
            throw new SignatureException("CRL does not verify with supplied public key.");
        }

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        else
        {
            sig = Signature.getInstance(signatureAlgorithm.getObjectId().getId(), provider);
        }
        PublicKey pubKey = this.getPublicKey(provider);
        sig.initVerify(pubKey);
        DERBitString pkBytes = new DERBitString(pkac);
        sig.update(pkBytes.getBytes());


        return sig.verify(signature.getBytes());
    }

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            throw new CertificateException("Signature algorithm in certificate info not same as outer certificate");
        }


        signature = Signature.getInstance(cert.getSignatureAlgorithm().getObjectId().getId(), provider);


        signature.initVerify(key);


        try
        {
            signature.update(cert.getAcinfo().getEncoded());
        }

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            }
        }


        setSignatureParameters(sig, sigAlgId.getParameters());
        
        sig.initVerify(pubKey);


        try
        {
            ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
            DEROutputStream         dOut = new DEROutputStream(bOut);

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        byte[] sigBytes = s.sign();


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


        s.initVerify(vKey);


        s.update(data);


        if (!s.verify(sigBytes))
        {

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        sig.update(data);


        sigBytes = sig.sign();


        sig.initVerify(verifyKey);


        sig.update(data);


        if (!sig.verify(sigBytes))
        {

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        sig.update(data);


        sigBytes = sig.sign();


        sig.initVerify(verifyKey);


        sig.update(data);


        if (!sig.verify(sigBytes))
        {

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        sig.update(data);


        sigBytes = sig.sign();


        sig.initVerify(verifyKey);


        sig.update(data);


        if (!sig.verify(sigBytes))
        {

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