Examples of java.security.Signature.update()

java.security.Signature.update()
Updates the data to be signed or verified by a byte. @param b the byte to use for the update. @exception SignatureException if this signature object is not initialized properly.

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


            dOut.writeObject(reqInfo);


            sig.update(bOut.toByteArray());
        }
        catch (Exception e)
        {
            throw new SecurityException("exception encoding TBS cert request - " + e);
        }

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


            dOut.writeObject(tbsCert);


            sig.update(bOut.toByteArray());
        }
        catch (Exception e)
        {
            throw new SecurityException("exception encoding TBS cert - " + e);
        }

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    private byte[] computeSignature(String stringToBeSigned, PrivateKey signingKey) throws GeneralSecurityException {
        String algo = signingKey.getAlgorithm();
        Signature sig = getSignature(algo);
        sig.initSign(signingKey);
        sig.update(stringToBeSigned.getBytes());
        return sig.sign();
    }


    public void validateSignature(SamlRedirectMessage urlEncodedRedirectMessage, PublicKey publicKey) throws InvalidRequestException {
        if (urlEncodedRedirectMessage.getSignature() == null) {

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    private boolean validate(byte[] signedContent, byte[] signatureValue, PublicKey validatingKey) throws GeneralSecurityException {
        String algo = validatingKey.getAlgorithm();
        Signature sig = getSignature(algo);


        sig.initVerify(validatingKey);
        sig.update(signedContent);
        return sig.verify(signatureValue);
    }


    private Signature getSignature(String algo) throws GeneralSecurityException {
        Signature sig = null;

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        writeUTF(algorithm);
        writeKey(key.getPublic());


        Signature sig = Signature.getInstance("SHA1with"+algorithm);
        sig.initSign(key.getPrivate());
        sig.update(key.getPublic().getEncoded());
        sig.update(sharedSecret);
        writeObject(sig.sign());
    }


    /**

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        writeKey(key.getPublic());


        Signature sig = Signature.getInstance("SHA1with"+algorithm);
        sig.initSign(key.getPrivate());
        sig.update(key.getPublic().getEncoded());
        sig.update(sharedSecret);
        writeObject(sig.sign());
    }


    /**
     * Verifies that we are talking to a peer that actually owns the private key corresponding to the public key we get.

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            PublicKey spk = KeyFactory.getInstance(serverKeyAlgorithm).generatePublic(readKey());


            // verify the identity of the server
            Signature sig = Signature.getInstance("SHA1with"+serverKeyAlgorithm);
            sig.initVerify(spk);
            sig.update(spk.getEncoded());
            sig.update(sharedSecret);
            sig.verify((byte[]) readObject());


            return spk;
        } catch (ClassNotFoundException e) {

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            // verify the identity of the server
            Signature sig = Signature.getInstance("SHA1with"+serverKeyAlgorithm);
            sig.initVerify(spk);
            sig.update(spk.getEncoded());
            sig.update(sharedSecret);
            sig.verify((byte[]) readObject());


            return spk;
        } catch (ClassNotFoundException e) {
            throw new Error(e); // impossible

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        try {
            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;

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        boolean result = false;
        try {
            Signature sig = Signature.getInstance(curve.defaultHashAlgorithm, curve.sigProvider);
            sig.initVerify(key);
      for(byte[] d: data)
        sig.update(d);
            result = sig.verify(signature, sigoffset, siglen);
        } catch (NoSuchAlgorithmException e) {
            Logger.error(ECDSA.class, "NoSuchAlgorithmException : "+e.getMessage(),e);
            e.printStackTrace();
        } catch (InvalidKeyException e) {

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