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BrokenJCEBlockCipher.javaAPI DocAndroid 1.5 API18654Wed May 06 22:41:06 BST 2009org.bouncycastle.jce.provider

BrokenJCEBlockCipher

public class BrokenJCEBlockCipher extends Object implements BrokenPBE

Fields Summary
private Class[]
availableSpecs
private org.bouncycastle.crypto.BufferedBlockCipher
cipher
private org.bouncycastle.crypto.params.ParametersWithIV
ivParam
private int
pbeType
private int
pbeHash
private int
pbeKeySize
private int
pbeIvSize
private int
ivLength
private AlgorithmParameters
engineParams
Constructors Summary
protected BrokenJCEBlockCipher(org.bouncycastle.crypto.BlockCipher engine)


     
         
    
        cipher = new PaddedBufferedBlockCipher(engine);
protected BrokenJCEBlockCipher(org.bouncycastle.crypto.BlockCipher engine, int pbeType, int pbeHash, int pbeKeySize, int pbeIvSize)

        cipher = new PaddedBufferedBlockCipher(engine);

        this.pbeType = pbeType;
        this.pbeHash = pbeHash;
        this.pbeKeySize = pbeKeySize;
        this.pbeIvSize = pbeIvSize;
Methods Summary
protected byte[]engineDoFinal(byte[] input, int inputOffset, int inputLen)

        int     len = 0;
        byte[]  tmp = new byte[engineGetOutputSize(inputLen)];

        if (inputLen != 0)
        {
            len = cipher.processBytes(input, inputOffset, inputLen, tmp, 0);
        }

        try
        {
            len += cipher.doFinal(tmp, len);
        }
        catch (DataLengthException e)
        {
            throw new IllegalBlockSizeException(e.getMessage());
        }
        catch (InvalidCipherTextException e)
        {
            throw new BadPaddingException(e.getMessage());
        }

        byte[]  out = new byte[len];

        System.arraycopy(tmp, 0, out, 0, len);

        return out;
protected intengineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)

        int     len = 0;

        if (inputLen != 0)
        {
                len = cipher.processBytes(input, inputOffset, inputLen, output, outputOffset);
        }

        try
        {
            return len + cipher.doFinal(output, outputOffset + len);
        }
        catch (DataLengthException e)
        {
            throw new IllegalBlockSizeException(e.getMessage());
        }
        catch (InvalidCipherTextException e)
        {
            throw new BadPaddingException(e.getMessage());
        }
protected intengineGetBlockSize()

        return cipher.getBlockSize();
protected byte[]engineGetIV()

        return (ivParam != null) ? ivParam.getIV() : null;
protected intengineGetKeySize(java.security.Key key)

        return key.getEncoded().length;
protected intengineGetOutputSize(int inputLen)

        return cipher.getOutputSize(inputLen);
protected java.security.AlgorithmParametersengineGetParameters()

        if (engineParams == null)
        {
            if (ivParam != null)
            {
                String  name = cipher.getUnderlyingCipher().getAlgorithmName();

                if (name.indexOf('/") >= 0)
                {
                    name = name.substring(0, name.indexOf('/"));
                }

                try
                {
                    engineParams = AlgorithmParameters.getInstance(name, "BC");
                    engineParams.init(ivParam.getIV());
                }
                catch (Exception e)
                {
                    throw new RuntimeException(e.toString());
                }
            }
        }

        return engineParams;
protected voidengineInit(int opmode, java.security.Key key, java.security.spec.AlgorithmParameterSpec params, java.security.SecureRandom random)

        CipherParameters        param;

        //
        // a note on iv's - if ivLength is zero the IV gets ignored (we don't use it).
        //
        if (key instanceof JCEPBEKey)
        {
            param = BrokenPBE.Util.makePBEParameters((JCEPBEKey)key, params, pbeType, pbeHash,
                        cipher.getUnderlyingCipher().getAlgorithmName(), pbeKeySize, pbeIvSize);

            if (pbeIvSize != 0)
            {
                ivParam = (ParametersWithIV)param;
            }
        }
        else if (params == null)
        {
            param = new KeyParameter(key.getEncoded());
        }
        else if (params instanceof IvParameterSpec)
        {
            if (ivLength != 0)
            {
                param = new ParametersWithIV(new KeyParameter(key.getEncoded()), ((IvParameterSpec)params).getIV());
                ivParam = (ParametersWithIV)param;
            }
            else
            {
                param = new KeyParameter(key.getEncoded());
            }
        }
        else if (params instanceof RC2ParameterSpec)
        {
            RC2ParameterSpec    rc2Param = (RC2ParameterSpec)params;

            param = new RC2Parameters(key.getEncoded(), ((RC2ParameterSpec)params).getEffectiveKeyBits());

            if (rc2Param.getIV() != null && ivLength != 0)
            {
                param = new ParametersWithIV(param, rc2Param.getIV());
                ivParam = (ParametersWithIV)param;
            }
        }
        else if (params instanceof RC5ParameterSpec)
        {
            RC5ParameterSpec    rc5Param = (RC5ParameterSpec)params;

            param = new RC5Parameters(key.getEncoded(), ((RC5ParameterSpec)params).getRounds());
            if (rc5Param.getWordSize() != 32)
            {
                throw new IllegalArgumentException("can only accept RC5 word size 32 (at the moment...)");
            }
            if ((rc5Param.getIV() != null) && (ivLength != 0))
            {
                param = new ParametersWithIV(param, rc5Param.getIV());
                ivParam = (ParametersWithIV)param;
            }
        }
        else
        {
            throw new InvalidAlgorithmParameterException("unknown parameter type.");
        }

        if ((ivLength != 0) && !(param instanceof ParametersWithIV))
        {
            if (random == null)
            {
                random = new SecureRandom();
            }

            if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE))
            {
                byte[]  iv = new byte[ivLength];

                random.nextBytes(iv);
                param = new ParametersWithIV(param, iv);
                ivParam = (ParametersWithIV)param;
            }
            else
            {
                throw new InvalidAlgorithmParameterException("no IV set when one expected");
            }
        }

        switch (opmode)
        {
        case Cipher.ENCRYPT_MODE:
        case Cipher.WRAP_MODE:
            cipher.init(true, param);
            break;
        case Cipher.DECRYPT_MODE:
        case Cipher.UNWRAP_MODE:
            cipher.init(false, param);
            break;
        default:
            System.out.println("eeek!");
        }
protected voidengineInit(int opmode, java.security.Key key, java.security.AlgorithmParameters params, java.security.SecureRandom random)

        AlgorithmParameterSpec  paramSpec = null;

        if (params != null)
        {
            for (int i = 0; i != availableSpecs.length; i++)
            {
                try
                {
                    paramSpec = params.getParameterSpec(availableSpecs[i]);
                    break;
                }
                catch (Exception e)
                {
                    continue;
                }
            }

            if (paramSpec == null)
            {
                throw new InvalidAlgorithmParameterException("can't handle parameter " + params.toString());
            }
        }

        engineParams = params;
        engineInit(opmode, key, paramSpec, random);
protected voidengineInit(int opmode, java.security.Key key, java.security.SecureRandom random)

        try
        {
            engineInit(opmode, key, (AlgorithmParameterSpec)null, random);
        }
        catch (InvalidAlgorithmParameterException e)
        {
            throw new IllegalArgumentException(e.getMessage());
        }
protected voidengineSetMode(java.lang.String mode)

        String  modeName = Strings.toUpperCase(mode);

        if (modeName.equals("ECB"))
        {
            ivLength = 0;
            cipher = new PaddedBufferedBlockCipher(cipher.getUnderlyingCipher());
        }
        else if (modeName.equals("CBC"))
        {
            ivLength = cipher.getUnderlyingCipher().getBlockSize();
            cipher = new PaddedBufferedBlockCipher(
                            new CBCBlockCipher(cipher.getUnderlyingCipher()));
        }
        else if (modeName.startsWith("OFB"))
        {
            ivLength = cipher.getUnderlyingCipher().getBlockSize();
            if (modeName.length() != 3)
            {
                int wordSize = Integer.parseInt(modeName.substring(3));

                cipher = new PaddedBufferedBlockCipher(
                                new OFBBlockCipher(cipher.getUnderlyingCipher(), wordSize));
            }
            else
            {
                cipher = new PaddedBufferedBlockCipher(
                        new OFBBlockCipher(cipher.getUnderlyingCipher(), 8 * cipher.getBlockSize()));
            }
        }
        else if (modeName.startsWith("CFB"))
        {
            ivLength = cipher.getUnderlyingCipher().getBlockSize();
            if (modeName.length() != 3)
            {
                int wordSize = Integer.parseInt(modeName.substring(3));

                cipher = new PaddedBufferedBlockCipher(
                                new CFBBlockCipher(cipher.getUnderlyingCipher(), wordSize));
            }
            else
            {
                cipher = new PaddedBufferedBlockCipher(
                        new CFBBlockCipher(cipher.getUnderlyingCipher(), 8 * cipher.getBlockSize()));
            }
        }
        else
        {
            throw new IllegalArgumentException("can't support mode " + mode);
        }
protected voidengineSetPadding(java.lang.String padding)

        String  paddingName = Strings.toUpperCase(padding);

        if (paddingName.equals("NOPADDING"))
        {
            cipher = new BufferedBlockCipher(cipher.getUnderlyingCipher());
        }
        else if (paddingName.equals("PKCS5PADDING") || paddingName.equals("PKCS7PADDING") || paddingName.equals("ISO10126PADDING"))
        {
            cipher = new PaddedBufferedBlockCipher(cipher.getUnderlyingCipher());
        }
        else if (paddingName.equals("WITHCTS"))
        {
            cipher = new CTSBlockCipher(cipher.getUnderlyingCipher());
        }
        else
        {
            throw new NoSuchPaddingException("Padding " + padding + " unknown.");
        }
protected java.security.KeyengineUnwrap(byte[] wrappedKey, java.lang.String wrappedKeyAlgorithm, int wrappedKeyType)

        byte[] encoded = null;
        try
        {
            encoded = engineDoFinal(wrappedKey, 0, wrappedKey.length);
        }
        catch (BadPaddingException e)
        {
            throw new InvalidKeyException(e.getMessage());
        }
        catch (IllegalBlockSizeException e2)
        {
            throw new InvalidKeyException(e2.getMessage());
        }

        if (wrappedKeyType == Cipher.SECRET_KEY)
        {
            return new SecretKeySpec(encoded, wrappedKeyAlgorithm);
        }
        else
        {
            try
            {
                KeyFactory kf = KeyFactory.getInstance(wrappedKeyAlgorithm, "BC");

                if (wrappedKeyType == Cipher.PUBLIC_KEY)
                {
                    return kf.generatePublic(new X509EncodedKeySpec(encoded));
                }
                else if (wrappedKeyType == Cipher.PRIVATE_KEY)
                {
                    return kf.generatePrivate(new PKCS8EncodedKeySpec(encoded));
                }
            }
            catch (NoSuchProviderException e)
            {
                throw new InvalidKeyException("Unknown key type " + e.getMessage());
            }
            catch (NoSuchAlgorithmException e)
            {
                throw new InvalidKeyException("Unknown key type " + e.getMessage());
            }
            catch (InvalidKeySpecException e2)
            {
                throw new InvalidKeyException("Unknown key type " + e2.getMessage());
            }

            throw new InvalidKeyException("Unknown key type " + wrappedKeyType);
        }
protected byte[]engineUpdate(byte[] input, int inputOffset, int inputLen)

        int     length = cipher.getUpdateOutputSize(inputLen);

        if (length > 0)
        {
                byte[]  out = new byte[length];

                cipher.processBytes(input, inputOffset, inputLen, out, 0);
                return out;
        }

        cipher.processBytes(input, inputOffset, inputLen, null, 0);

        return null;
protected intengineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)

        return cipher.processBytes(input, inputOffset, inputLen, output, outputOffset);
protected byte[]engineWrap(java.security.Key key)

        byte[] encoded = key.getEncoded();
        if (encoded == null)
        {
            throw new InvalidKeyException("Cannot wrap key, null encoding.");
        }

        try
        {
            return engineDoFinal(encoded, 0, encoded.length);
        }
        catch (BadPaddingException e)
        {
            throw new IllegalBlockSizeException(e.getMessage());
        }