Examples of java.security.Signature.sign()

java.security.Signature.sign()
Returns the signature bytes of all the data updated. The format of the signature depends on the underlying signature scheme.
A call to this method resets this signature object to the state it was in when previously initialized for signing via a call to initSign(PrivateKey). That is, the object is reset and available to generate another signature from the same signer, if desired, via new calls to update and sign. @return the signature bytes of the signing operation's result. @exception SignatureException if this signature object is notinitialized properly or if this signature algorithm is unable to process the input data provided.

            while(true) {
                Signature sig = Signature.getInstance(curve.defaultHashAlgorithm, curve.sigProvider);
                sig.initSign(key.getPrivate());
          for(byte[] d: data)
            sig.update(d);
                result = sig.sign();
                // It's a DER encoded signature, most sigs will fit in N bytes
                // If it doesn't let's re-sign.
                if(result.length <= curve.maxSigSize)
                  break;
                else

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        random.nextBytes(sampleMessage);


        Signature normalSig = Signature.getInstance(sigName, "BC");
        normalSig.initSign(privKey);
        normalSig.update(sampleMessage);
        byte[] normalResult = normalSig.sign();


        MessageDigest digest = MessageDigest.getInstance(digestOID.getId(), "BC");
        byte[] hash = digest.digest(sampleMessage);
        byte[] digInfo = derEncode(digestOID, hash);

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        byte[] digInfo = derEncode(digestOID, hash);


        Signature rawSig = Signature.getInstance("RSA", "BC");
        rawSig.initSign(privKey);
        rawSig.update(digInfo);
        byte[] rawResult = rawSig.sign();


        if (!Arrays.areEqual(normalResult, rawResult))
        {
            fail("raw mode signature differs from normal one");
        }

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        Signature s = Signature.getInstance("SHA1withRSA/PSS", "BC");


        s.initSign(privKey, new FixedRandom(slt1a));
        s.update(msg1a);
        byte[] sig = s.sign();


        if (!arrayEquals(sig1a, sig))
        {
           fail("PSS Sign test expected " + new String(Hex.encode(sig1a)) + " got " + new String(Hex.encode(sig)));
        }

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        s = Signature.getInstance("SHA256withRSA/PSS", "BC");


        s.initSign(privKey, new FixedRandom(slt1a));
        s.update(msg1a);
        sig = s.sign();


        pss = s.getParameters();
        
        if (!arrayEquals(sig1b, sig))
        {

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


        sgr.update(message);


        byte[]  sigBytes = sgr.sign();


        sgr.initVerify(vKey);


        sgr.update(message);

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        s.initSign(sKey);


        s.update(data);


        byte[]  sigBytes = s.sign();


        s = Signature.getInstance("GOST3410", "BC");


        s.initVerify(vKey);

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        s.initSign(sKey);


        s.update(data);


        sigBytes = s.sign();


        s = Signature.getInstance("GOST3410", "BC");


        s.initVerify(vKey);

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        s.initSign(sKey);


        s.update(data);


        sigBytes = s.sign();


        s = Signature.getInstance("ECGOST3410", "BC");


        s.initVerify(vKey);

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        s.initSign(sKey);


        s.update(data);


        byte[]  sigBytes = s.sign();


        s = Signature.getInstance("GOST3410", "BC");


        s.initVerify(vKey);

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