Examples of java.security.Signature$SignatureImpl

java.security.Signature
Internal Signature implementation


        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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