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.

        logger.log(BasicLevel.ERROR, "EXCEPTION:: validate", e);
      throw new Exception("Error while getting the algorithm 'SHA1withDSA' :" + e.getMessage());
    }


    try {
      signature.initVerify(publickey);
    } catch (InvalidKeyException e) {
      if (logger.isLoggable(BasicLevel.ERROR))
        logger.log(BasicLevel.ERROR, "EXCEPTION:: validate", e);
      throw new Exception("Cannot initialize the signature with the given public key:" + e.getMessage());
    }

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      byte[]    signature  = null;
      
      Signature  sig = Signature.getInstance("MD5withRSA" );


      sig.initVerify( key );
      
      while( true ){
        
        ZipEntry  entry = zis.getNextEntry();

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    RSAPublicKey public_key   = (RSAPublicKey)key_factory.generatePublic( public_key_spec );
    
    Signature  sig = Signature.getInstance("MD5withRSA" );


    sig.initVerify( public_key );
    
    sig.update( data.getBytes( "UTF-8" ));
      
    if ( !sig.verify( signature )){

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      throw new CRLException("Signature algorithm on CertifcateList 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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        ECCsig.initSign((ECPrivateKey)key);
        
      }else if( key instanceof ECPublicKey ){
        
        ECCsig.initVerify((ECPublicKey)key);


      }else{
        
        throw new CryptoManagerException("Invalid Key Type, ECC keys required");
      }

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    }
    
    try{
      Signature  verifier = Signature.getInstance("MD5withRSA" );
      
      verifier.initVerify( key_block_public_key );
      
      verifier.update( kb.getRequest() );


      if ( !verifier.verify( kb.getCertificate())){

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    byte[]    signature )
  {
    try{
      Signature  verifier = Signature.getInstance("MD5withRSA" );
      
      verifier.initVerify( key_block_public_key );
      
      verifier.update( request );


      if ( !verifier.verify( signature )){

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                sig = Signature.getInstance(signatureAlgorithm, provider);
            }
        }


        sig.initVerify(this.getPublicKey(provider));


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

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        catch (Exception e)
        {
            signature = Signature.getInstance(c.getSignatureAlgorithm().getObjectId().getId());
        }


        signature.initVerify(key);


        signature.update(this.getTBSCertificate());


        if (!signature.verify(this.getSignature()))
        {

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                signature = bar.readBinaryString();
            }


            Signature s = Signature.getInstance("SHA1withRSA");
            s.initVerify(pubKey);
            s.update(data);


            return s.verify(signature);
        } catch (NoSuchAlgorithmException nsae) {
            throw new InvalidSignatureException();

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