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


        ECPublicKeySpec pubKey = new ECPublicKeySpec(
            curve.decodePoint(Hex.decode("02006BFDD2C9278B63C92D6624F151C9D7A822CC75BD983B17D25D74C26740380022D3D8FAF304781E416175EADF4ED6E2B47142D2454A7AC7801DD803CF44A4D1F0AC")), // Q
            spec);


        Signature           sgr = Signature.getInstance("SHA512withECNR", "BC");
        byte[] message = new byte[] { (byte)'a', (byte)'b', (byte)'c' };
        
        checkSignature(521, priKey, pubKey, sgr, k, message, r, s);
    }

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        ECPrivateKey sKey,
        ECPublicKey vKey)
        throws Exception
    {
        byte[]           data = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
        Signature        s = Signature.getInstance("ECDSA", "BC");


        s.initSign(sKey);


        s.update(data);


        byte[] sigBytes = s.sign();


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


        s.initVerify(vKey);


        s.update(data);


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

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        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSTU4145", "BC");
        keyGen.initialize(spec, keyRand);
        KeyPair pair = keyGen.generateKeyPair();
        
        Signature sgr = Signature.getInstance("DSTU4145", "BC");


        sgr.initSign(pair.getPrivate(), k);


        byte[] message = new byte[]{(byte)'a', (byte)'b', (byte)'c'};


        sgr.update(message);


        byte[] sigBytes = sgr.sign();


        sgr.initVerify(pair.getPublic());


        sgr.update(message);


        if (!sgr.verify(sigBytes))
        {
            fail("DSTU4145 verification failed");
        }


        BigInteger[] sig = decode(sigBytes);

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        ECPublicKeySpec pubKey = new ECPublicKeySpec(
            curve.createPoint(new BigInteger("22de541d48a75c1c3b8c7c107b2551c5093c6c096e1", 16), new BigInteger("1e5b602efc0269d61e64d97c9193d2788fa05c4b7fd5", 16), false),
            spec);


        Signature sgr = Signature.getInstance("DSTU4145", "BC");
        KeyFactory f = KeyFactory.getInstance("DSTU4145", "BC");
        PrivateKey sKey = f.generatePrivate(priKey);
        PublicKey vKey = f.generatePublic(pubKey);


        sgr.initSign(sKey, k);


        byte[] message = new byte[]{(byte)'a', (byte)'b', (byte)'c'};


        sgr.update(message);


        byte[] sigBytes = sgr.sign();


        sgr.initVerify(vKey);


        sgr.update(message);


        if (!sgr.verify(sigBytes))
        {
            fail("DSTU4145 verification failed");
        }


        BigInteger[] sig = decode(sigBytes);

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            }
        }


        ResponseData  tbsResp = new ResponseData(responderID.toASN1Object(), new DERGeneralizedTime(producedAt), new DERSequence(responses), responseExtensions);


        Signature sig = null;


        try
        {
            sig = OCSPUtil.createSignatureInstance(signatureName, provider);
            if (random != null)
            {
                sig.initSign(key, random);
            }
            else
            {
                sig.initSign(key);
            }
        }
        catch (NoSuchProviderException e)
        {
            // TODO Why this special case?
            throw e;
        }
        catch (GeneralSecurityException e)
        {
            throw new OCSPException("exception creating signature: " + e, e);
        }


        DERBitString    bitSig = null;


        try
        {
            sig.update(tbsResp.getEncoded(ASN1Encoding.DER));


            bitSig = new DERBitString(sig.sign());
        }
        catch (Exception e)
        {
            throw new OCSPException("exception processing TBSRequest: " + e, e);
        }

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        PublicKey pubKey,
        String provider)
        throws NoSuchAlgorithmException, NoSuchProviderException,
                InvalidKeyException, SignatureException
    {
        Signature   sig;


        try
        {
            if (provider == null)
            {
                sig = Signature.getInstance(getSignatureName(sigAlgId));
            }
            else
            {
                sig = Signature.getInstance(getSignatureName(sigAlgId), provider);
            }
        }
        catch (NoSuchAlgorithmException e)
        {
            //
            // try an alternate
            //
            if (oids.get(sigAlgId.getObjectId()) != null)
            {
                String  signatureAlgorithm = (String)oids.get(sigAlgId.getObjectId());


                if (provider == null)
                {
                    sig = Signature.getInstance(signatureAlgorithm);
                }
                else
                {
                    sig = Signature.getInstance(signatureAlgorithm, provider);
                }
            }
            else
            {
                throw e;
            }
        }


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


        try
        {
            sig.update(reqInfo.getEncoded(ASN1Encoding.DER));
        }
        catch (Exception e)
        {
            throw new SignatureException("exception encoding TBS cert request - " + e);
        }


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

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            throw new OCSPException("attempt to verify signature on unsigned object");
        }


        try
        {
            Signature signature = OCSPUtil.createSignatureInstance(this.getSignatureAlgOID(), sigProvider);


            signature.initVerify(key);


            ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
            ASN1OutputStream        aOut = new ASN1OutputStream(bOut);


            aOut.writeObject(req.getTbsRequest());


            signature.update(bOut.toByteArray());


            return signature.verify(this.getSignature());
        }
        catch (NoSuchProviderException e)
        {
            // TODO Why this special case?
            throw e;

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          String.format("Non-EC signature %s not supported yet",
              logInfo.getSignatureAlgorithm()));
    }


    try {
      Signature signature = Signature.getInstance("SHA256withECDSA");
      signature.initVerify(logInfo.getKey());
      signature.update(toVerify);
      return signature.verify(sct.getSignature().getSignature().toByteArray());
    } catch (SignatureException e) {
      throw new CertificateTransparencyException("Signature object not properly initialized or"
          + " signature from SCT is improperly encoded.", e);
    } catch (InvalidKeyException e) {
      throw new CertificateTransparencyException("Log's public key cannot be used", e);

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        catch (IOException e)
        {
            throw new IllegalArgumentException("can't encode public key");
        }


        Signature sig;
        if (provider == null)
        {
            sig = Signature.getInstance(signatureAlgorithm);
        }
        else
        {
            sig = Signature.getInstance(signatureAlgorithm, provider);
        }


        sig.initSign(signingKey);


        try
        {
            sig.update(reqInfo.getEncoded(ASN1Encoding.DER));
        }
        catch (Exception e)
        {
            throw new IllegalArgumentException("exception encoding TBS cert request - " + e);
        }


        this.sigBits = new DERBitString(sig.sign());
    }

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        String      sigProvider)
        throws OCSPException, NoSuchProviderException
    {
        try
        {
            Signature signature = OCSPUtil.createSignatureInstance(this.getSignatureAlgName(), sigProvider);


            signature.initVerify(key);


            signature.update(resp.getTbsResponseData().getEncoded(ASN1Encoding.DER));


            return signature.verify(this.getSignature());
        }
        catch (NoSuchProviderException e)
        {
            // TODO Why this special case?
            throw e;

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