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.

     */
    public byte[] generateSignature(byte[] data) {
        try {
            Signature sig = Signature.getInstance("SHA1withRSA");
            sig.initSign(prvKey);
            sig.update(data);


            ByteArrayWriter baw = new ByteArrayWriter();
            baw.writeString(getAlgorithmName());
            baw.writeBinaryString(sig.sign());

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                         System.arraycopy(signature, 20, encoded,
                asn1r.length + roffset + 20 + asn1s.length + soffset, 20);
             */
            Signature sig = Signature.getInstance("SHA1withDSA");
            sig.initVerify(pubkey);
            sig.update(data);


            return sig.verify(encoded);
        } catch (NoSuchAlgorithmException nsae) {
            throw new InvalidSignatureException();
        } catch (java.security.InvalidKeyException ike) {

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        throws InvalidSignatureException {
        try {
            Signature sig = Signature.getInstance("SHA1withDSA");
            sig.initSign(prvkey);


            sig.update(data);


            byte[] signature = sig.sign();
            byte[] decoded = new byte[40];
            SimpleASNReader asn = new SimpleASNReader(signature);
            asn.getByte();

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         dosetaBuffer.append(entry.getKey()).append("=").append(entry.getValue());
      }
      if (!first) dosetaBuffer.append(";");
      dosetaBuffer.append("b=");
      String dosetaHeader = dosetaBuffer.toString();
      signature.update(dosetaHeader.getBytes());


      byte[] signed = signature.sign();
      setSignature(signed);
      String base64Signature = Base64.encodeBytes(signed);
      dosetaHeader += base64Signature;

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         throw new SignatureException("Body hashes do not match.");
      }
      updateSignatureWithHeader(headers, verifier);
      ParameterParser parser = new ParameterParser();
      String strippedHeader = parser.setAttribute(headerValue.toCharArray(), 0, headerValue.length(), ';', "b", "");
      verifier.update(strippedHeader.getBytes());
      if (verifier.verify(getSignature()) == false)
      {
         throw new SignatureException("Failed to verify signature.");
      }
   }

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            BufferedInputStream bufin = new BufferedInputStream(fis);
            byte[] buffer = new byte[1024];
            int len;
            while (bufin.available() != 0) {
                len = bufin.read(buffer);
                sign.update(buffer, 0, len);
            }
            bufin.close();


            /* generate unterschrift */
            byte[] realSig = sign.sign();

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            BufferedInputStream bufin = new BufferedInputStream(datafis);
            byte[] buffer = new byte[1024];
            int len;
            while (bufin.available() != 0) {
                len = bufin.read(buffer);
                sig.update(buffer, 0, len);
            }
            bufin.close();


            /* verify */
            boolean verifies = sig.verify(sigToVerify);

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      byte[] temp = new byte[1024];
      int length = 0;
      while (buf.available() != 0) {
        length = buf.read(temp);
        sig.update(temp, 0, length);
      }
      buf.close();


      boolean isVaild = sig.verify(hexStringToByteArray(signature));
      System.out.println("Validated " + filename + ": " + isVaild);

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        String signAlgString = PKCSObjectIdentifiers.md5WithRSAEncryption.equals(alg0) ? "MD5withRSA" :
                               PKCSObjectIdentifiers.md2WithRSAEncryption.equals(alg0) ? "MD2withRSA" :
                               PKCSObjectIdentifiers.sha1WithRSAEncryption.equals(alg0) ? "SHA1withRSA" : null;
        Signature signObj = Signature.getInstance(signAlgString);
        signObj.initVerify(pubKey);
        signObj.update(pkacSeq.getEncoded());
        boolean verified = signObj.verify(signature);
        if(!verified) throw new Exception("SignedPublicKeyAndChallenge verification failed.");
        map.put(CERT_REQ_PUBLICKEY, pkInfo);
        map.put(CERT_REQ_PUBLICKEY_OBJ, pubKey);
        if(((DERString)ch).getString() != null) map.put(PKAC_CHALLENGE, ((DERString)ch).getString());

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            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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