Examples of javax.crypto.CipherOutputStream

javax.crypto.CipherOutputStream
This class wraps an output stream and a cipher so that {@code write} methodssend the data through the cipher before writing them to the underlying output stream.
The cipher must be initialized for the requested operation before being used by a {@code CipherOutputStream}. For example, if a cipher initialized for encryption is used with a {@code CipherOutputStream}, the {@code CipherOutputStream} tries to encrypt the data writing it out.

      System.out.println("TEST: detecting inFileLength  : " + inFileSize);
      System.out.println("TEST: detecting flag          : " + flag);
      System.out.println("TEST: detecting inFileName    : " + origFileName);


      // open the output file
      fout = new BufferedOutputStream(new CipherOutputStream(new FileOutputStream(outFileName), dcipher), 4096);


      // read and decrypt the file
      copy(fout, fin, 512);
      
      // close the files

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        }


        try {
            outCipher.init(Cipher.ENCRYPT_MODE, key);


            return new CipherOutputStream(out, outCipher);
        } catch (java.security.InvalidKeyException e) {
            throw Error.error(ErrorCode.X_S0531, e);
        }
    }

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    final Cipher cipher = Cipher.getInstance("Blowfish/ECB/PKCS5Padding");
    cipher.init(mode, skeySpec);


    final ByteArrayOutputStream bos = new ByteArrayOutputStream();
    final ByteArrayInputStream bis = new ByteArrayInputStream(input);
    final CipherOutputStream cos = new CipherOutputStream(bos, cipher);


    int length = 0;
    final byte[] buffer =  new byte[1024];


    while ((length = bis.read(buffer)) != -1) {
      cos.write(buffer, 0, length);
    }


    bis.close();
    cos.close();


    return bos.toByteArray();
  }

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                        "stream for cipher ", e, log);
            }
        }


        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        CipherOutputStream out = new CipherOutputStream(baos, cipher);


        byte[] buffer = new byte[64];
        int length;
        try {
            while ((length = sourceStream.read(buffer)) != -1) {
                out.write(buffer, 0, length);
            }
        } catch (IOException e) {
            throw new SecureVaultException("IOError when reading the input" +
                    " stream for cipher ", e, log);
        } finally {
            try {
                sourceStream.close();
                out.flush();
                out.close();
            } catch (IOException ignored) {
                // ignore exception
            }
        }

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                    ciphers = new CipherPair(cipherTransformation);
                }
            } catch (GeneralSecurityException e) {
                throw new IOException(e.getMessage(), e);
            }
            out = new CipherOutputStream(out, ciphers.getEncryptor()) {
                boolean closed;
                public void close() throws IOException {
                    if (!closed) {
                        super.close();
                        closed = true;

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      }
      catch(Exception e)
      {
         throw new IOException("Failed to init cipher: "+e.getMessage());
      }
      CipherOutputStream cos = new CipherOutputStream(os, cipher);
      return cos;
   }

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        KeyGenerator            keyGen;
        SecureRandom            rand;
        Cipher                  in = null;
        Cipher                  out = null;
        CipherInputStream       cIn;
        CipherOutputStream      cOut;
        ByteArrayInputStream    bIn;
        ByteArrayOutputStream   bOut;


        rand = new FixedSecureRandom();


        try
        {
            String  baseAlgorithm;
            int     index = algorithm.indexOf('/');


            if (index > 0)
            {
                baseAlgorithm = algorithm.substring(0, index);
            }
            else
            {
                baseAlgorithm = algorithm;
            }


            if (baseAlgorithm.equals("IDEA") & noIDEA())
            {
                return;
            }


            keyGen = KeyGenerator.getInstance(baseAlgorithm, "BC");
            if (!keyGen.getAlgorithm().equals(baseAlgorithm))
            {
                fail("wrong key generator returned!");
            }
            keyGen.init(rand);


            key = keyGen.generateKey();


            in = Cipher.getInstance(algorithm, "BC");
            out = Cipher.getInstance(algorithm, "BC");


            if (!in.getAlgorithm().startsWith(baseAlgorithm))
            {
                fail("wrong cipher returned!");
            }


            if (algorithm.startsWith("RC2"))
            {
                out.init(Cipher.ENCRYPT_MODE, key, rc2Spec, rand);
            }
            else if (algorithm.startsWith("RC5"))
            {
                if (algorithm.startsWith("RC5-64"))
                {
                    out.init(Cipher.ENCRYPT_MODE, key, rc564Spec, rand);
                }
                else
                {
                    out.init(Cipher.ENCRYPT_MODE, key, rc5Spec, rand);
                }
            }
            else
            {
                out.init(Cipher.ENCRYPT_MODE, key, rand);
            }
        }
        catch (Exception e)
        {
            fail("" + algorithm + " failed initialisation - " + e.toString(), e);
        }


        //
        // grab the iv if there is one
        //
        try
        {
            if (algorithm.startsWith("RC2"))
            {
                in.init(Cipher.DECRYPT_MODE, key, rc2Spec);
            }
            else if (algorithm.startsWith("RC5"))
            {
                if (algorithm.startsWith("RC5-64"))
                {
                    in.init(Cipher.DECRYPT_MODE, key, rc564Spec, rand);
                }
                else
                {
                    in.init(Cipher.DECRYPT_MODE, key, rc5Spec, rand);
                }
            }
            else
            {
                byte[]    iv;


                iv = out.getIV();
                if (iv != null)
                {
                    try
                    {
                        byte[]  nIv = new byte[iv.length - 1];


                        in.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(nIv));
                        fail("failed to pick up short IV");
                    }
                    catch (InvalidAlgorithmParameterException e)
                    {
                        // ignore - this is what we want...
                    }


                    IvParameterSpec    spec;


                    spec = new IvParameterSpec(iv);


                    in.init(Cipher.DECRYPT_MODE, key, spec);
                }
                else
                {
                    in.init(Cipher.DECRYPT_MODE, key);
                }
            }
        }
        catch (Exception e)
        {
            fail("" + algorithm + " failed initialisation - " + e.toString());
        }


        //
        // encryption pass
        //
        bOut = new ByteArrayOutputStream();


        cOut = new CipherOutputStream(bOut, out);


        try
        {
            for (int i = 0; i != input.length / 2; i++)
            {
                cOut.write(input[i]);
            }
            cOut.write(input, input.length / 2, input.length - input.length / 2);
            cOut.close();
        }
        catch (IOException e)
        {
            fail("" + algorithm + " failed encryption - " + e.toString());
        }

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        KeyGenerator            keyGen;
        SecureRandom            rand;
        Cipher                  in = null;
        Cipher                  out = null;
        CipherInputStream       cIn;
        CipherOutputStream      cOut;
        ByteArrayInputStream    bIn;
        ByteArrayOutputStream   bOut;


        rand = new FixedSecureRandom();


        try
        {
            keyGen = KeyGenerator.getInstance(alg, "BC");
            keyGen.init(strength, rand);


            key = keyGen.generateKey();


            in = Cipher.getInstance(alg + "/ECB/PKCS7Padding", "BC");
            out = Cipher.getInstance(alg + "/ECB/PKCS7Padding", "BC");


            out.init(Cipher.ENCRYPT_MODE, key, rand);
        }
        catch (Exception e)
        {
            fail(alg + " failed initialisation - " + e.toString());
        }


        try
        {
            in.init(Cipher.DECRYPT_MODE, key);
        }
        catch (Exception e)
        {
            fail(alg + " failed initialisation - " + e.toString());
        }


        //
        // encryption pass
        //
        bOut = new ByteArrayOutputStream();


        cOut = new CipherOutputStream(bOut, out);


        try
        {
            for (int i = 0; i != input.length / 2; i++)
            {
                cOut.write(input[i]);
            }
            cOut.write(input, input.length / 2, input.length - input.length / 2);
            cOut.close();
        }
        catch (IOException e)
        {
            fail(alg + " failed encryption - " + e.toString());
        }

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        throws Exception
    {
        Key                     key;
        Cipher                  in, out;
        CipherInputStream       cIn;
        CipherOutputStream      cOut;
        ByteArrayInputStream    bIn;
        ByteArrayOutputStream   bOut;


        key = new SecretKeySpec(keyBytes, "AES");


        in = Cipher.getInstance("AES/ECB/NoPadding", "BC");
        out = Cipher.getInstance("AES/ECB/NoPadding", "BC");
        
        try
        {
            out.init(Cipher.ENCRYPT_MODE, key);
        }
        catch (Exception e)
        {
            fail("AES failed initialisation - " + e.toString(), e);
        }


        try
        {
            in.init(Cipher.DECRYPT_MODE, key);
        }
        catch (Exception e)
        {
            fail("AES failed initialisation - " + e.toString(), e);
        }


        //
        // encryption pass
        //
        bOut = new ByteArrayOutputStream();


        cOut = new CipherOutputStream(bOut, out);


        try
        {
            for (int i = 0; i != input.length / 2; i++)
            {
                cOut.write(input[i]);
            }
            cOut.write(input, input.length / 2, input.length - input.length / 2);
            cOut.close();
        }
        catch (IOException e)
        {
            fail("AES failed encryption - " + e.toString(), e);
        }

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            dOut.writeInt(salt.length);
            dOut.write(salt);
            dOut.writeInt(iterationCount);


            Cipher              cipher = makePBECipher(KEY_CIPHER, Cipher.ENCRYPT_MODE, password, salt, iterationCount);
            CipherOutputStream  cOut = new CipherOutputStream(dOut, cipher);


            dOut = new DataOutputStream(cOut);


            encodeKey(key, dOut);

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