Examples of java.security.Signature

java.security.Signature
This Signature class is used to provide applications the functionality of a digital signature algorithm. Digital signatures are used for authentication and integrity assurance of digital data.
The signature algorithm can be, among others, the NIST standard DSA, using DSA and SHA-1. The DSA algorithm using the SHA-1 message digest algorithm can be specified as SHA1withDSA. In the case of RSA, there are multiple choices for the message digest algorithm, so the signing algorithm could be specified as, for example, MD2withRSA, MD5withRSA, or SHA1withRSA. The algorithm name must be specified, as there is no default.
A Signature object can be used to generate and verify digital signatures.
There are three phases to the use of a Signature object for either signing data or verifying a signature:
1. Initialization, with either
  - a public key, which initializes the signature for verification (see {@link #initVerify(PublicKey) initVerify}), or
  - a private key (and optionally a Secure Random Number Generator), which initializes the signature for signing (see {@link #initSign(PrivateKey)}and {@link #initSign(PrivateKey,SecureRandom)}).
2. Updating
  
  Depending on the type of initialization, this will update the bytes to be signed or verified. See the {@link #update(byte) update} methods.
3. Signing or Verifying a signature on all updated bytes. See the {@link #sign() sign} methods and the {@link #verify(byte[]) verify}method.
Note that this class is abstract and extends from SignatureSpi for historical reasons. Application developers should only take notice of the methods defined in this Signature class; all the methods in the superclass are intended for cryptographic service providers who wish to supply their own implementations of digital signature algorithms. @author Benjamin Renaud @version 1.103, 04/21/06

        if (!c.getSignatureAlgorithm().equals(c.getTBSCertList().getSignature()))
        {
            throw new CRLException("Signature algorithm on CertificateList does not match TBSCertList.");
        }


        Signature sig;


        if (sigProvider != null)
        {
            sig = Signature.getInstance(getSigAlgName(), sigProvider);
        }
        else
        {
            sig = Signature.getInstance(getSigAlgName());
        }


        sig.initVerify(key);
        sig.update(this.getTBSCertList());


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

View Full Code Here

        if (cert.getSigAlgParams() != null)
        {
            fail("sig parameters present");
        }
        
        Signature sig = Signature.getInstance(algorithm, "BC");
        
        sig.initVerify(pubKey);
        
        sig.update(cert.getTBSCertificate());
        
        if (!sig.verify(cert.getSignature()))
        {
            fail("EC certificate signature not mapped correctly.");
        }
        // System.out.println(cert);
    }

View Full Code Here

        if (req.getSignatureAlgorithm().getParameters() != null)
        {
            fail("ECDSA parameters incorrect.");
        }
        
        Signature sig = Signature.getInstance(algorithm, "BC");
        
        sig.initVerify(pubKey);
        
        sig.update(req.getCertificationRequestInfo().getEncoded());
        
        if (!sig.verify(req.getSignature().getBytes()))
        {
            fail("signature not mapped correctly.");
        }
    }

View Full Code Here

        if (req.getSignatureAlgorithm().getParameters() != null)
        {
            fail("ECDSA parameters incorrect.");
        }


        Signature sig = Signature.getInstance(algorithm, "BC");


        sig.initVerify(pubKey);


        sig.update(req.getCertificationRequestInfo().getEncoded());


        if (!sig.verify(req.getSignature().getBytes()))
        {
            fail("signature not mapped correctly.");
        }
    }

View Full Code Here

        if (req.getSignatureAlgorithm().getParameters() != null)
        {
            fail("ECGOST parameters incorrect.");
        }


        Signature sig = Signature.getInstance(algorithm, "BC");


        sig.initVerify(pubKey);


        sig.update(req.getCertificationRequestInfo().getEncoded());


        if (!sig.verify(req.getSignature().getBytes()))
        {
            fail("signature not mapped correctly.");
        }
    }

View Full Code Here

        if (req.getSignatureAlgorithm().getParameters() == null)
        {
            fail("PSS parameters incorrect.");
        }


        Signature sig = Signature.getInstance(algorithm, "BC");


        sig.initVerify(pubKey);


        sig.update(req.getCertificationRequestInfo().getEncoded());


        if (!sig.verify(req.getSignature().getBytes()))
        {
            fail("signature not mapped correctly.");
        }
    }

View Full Code Here

        String      certName)
        throws Exception
    {
        X509Certificate  cert = loadCert(certName);
        byte[]           tbs = cert.getTBSCertificate();
        Signature        sig = Signature.getInstance(cert.getSigAlgName(), "BC");
        
        sig.initVerify(cert.getPublicKey());
        
        sig.update(tbs);
        
        assertFalse(sig.verify(cert.getSignature()));
    }

View Full Code Here

    public final void verify(
        PublicKey   key)
        throws CertificateException, NoSuchAlgorithmException,
        InvalidKeyException, NoSuchProviderException, SignatureException
    {
        Signature   signature;
        String      sigName = X509SignatureUtil.getSignatureName(c.getSignatureAlgorithm());
        
        try
        {
            signature = Signature.getInstance(sigName, BouncyCastleProvider.PROVIDER_NAME);

View Full Code Here

        String      sigProvider)
        throws CertificateException, NoSuchAlgorithmException,
        InvalidKeyException, NoSuchProviderException, SignatureException
    {
        String    sigName = X509SignatureUtil.getSignatureName(c.getSignatureAlgorithm());
        Signature signature = Signature.getInstance(sigName, sigProvider);
        
        checkSignature(key, signature);
    }

View Full Code Here

        if (!c.getSignatureAlgorithm().equals(c.getTBSCertList().getSignature()))
        {
            throw new CRLException("Signature algorithm on CertificateList does not match TBSCertList.");
        }


        Signature sig;


        if (sigProvider != null)
        {
            sig = Signature.getInstance(getSigAlgName(), sigProvider);
        }
        else
        {
            sig = Signature.getInstance(getSigAlgName());
        }


        sig.initVerify(key);
        sig.update(this.getTBSCertList());


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

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of java.security.Signature

br.net.woodstock.rockframework.security.sign.impl.JCASigner

br.net.woodstock.rockframework.security.sign.impl.KeyPairSigner

ch.ethz.prose.SignedAspect

cn.featherfly.common.algorithm.RSA

com.aelitis.azureus.core.security.impl.CryptoHandlerECC

com.aelitis.azureus.core.security.impl.CryptoSTSEngineImpl

com.aelitis.azureus.core.subs.impl.SubscriptionBodyImpl

com.aelitis.azureus.plugins.dht.impl.DHTPluginStorageManager

com.android.builder.signing.SignedJarBuilder

com.atlassian.connect.play.java.plugin.KeyPairPlugin

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.