jcersacipher.java

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                if (digest == null)
                {
                    throw new InvalidAlgorithmParameterException("no match on digest algorithm: "+ spec.getDigestAlgorithm());
                }

                MGF1ParameterSpec mgfParams = (MGF1ParameterSpec)spec.getMGFParameters();
                Digest mgfDigest = JCEDigestUtil.getDigest(mgfParams.getDigestAlgorithm());
                
                if (mgfDigest == null)
                {
                    throw new InvalidAlgorithmParameterException("no match on MGF digest algorithm: "+ mgfParams.getDigestAlgorithm());
                }
                
                cipher = new OAEPEncoding(new RSABlindedEngine(), digest, mgfDigest, ((PSource.PSpecified)spec.getPSource()).getValue());
            }
        }
        else
        {
            throw new IllegalArgumentException("unknown parameter type.");
        }

        if (!(cipher instanceof RSABlindedEngine))
        {
            if (random != null)
            {
                param = new ParametersWithRandom(param, random);
            }
            else
            {
                param = new ParametersWithRandom(param, new SecureRandom());
            }
        }

        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:
            throw new InvalidParameterException("unknown opmode " + opmode + " passed to RSA");
        }
    }

    protected void engineInit(
        int                 opmode,
        Key                 key,
        AlgorithmParameters params,
        SecureRandom        random) 
    throws InvalidKeyException, InvalidAlgorithmParameterException
    {
        AlgorithmParameterSpec  paramSpec = null;

        if (params != null)
        {
            try
            {
                paramSpec = params.getParameterSpec(OAEPParameterSpec.class);
            }
            catch (InvalidParameterSpecException e)
            {
                throw new InvalidAlgorithmParameterException("cannot recognise parameters: " + e.toString(), e);
            }
        }

        engineParams = params;
        engineInit(opmode, key, paramSpec, random);
    }

    protected void engineInit(
        int                 opmode,
        Key                 key,
        SecureRandom        random) 
    throws InvalidKeyException
    {
        try
        {
            engineInit(opmode, key, (AlgorithmParameterSpec)null, random);
        }
        catch (InvalidAlgorithmParameterException e)
        {
            // this shouldn't happen
            throw new RuntimeException("Eeeek! " + e.toString(), e);
        }
    }

    protected byte[] engineUpdate(
        byte[]  input,
        int     inputOffset,
        int     inputLen) 
    {
        bOut.write(input, inputOffset, inputLen);

        if (cipher instanceof RSABlindedEngine)
        {
            if (bOut.size() > cipher.getInputBlockSize() + 1)
            {
                throw new ArrayIndexOutOfBoundsException("too much data for RSA block");
            }
        }
        else
        {
            if (bOut.size() > cipher.getInputBlockSize())
            {
                throw new ArrayIndexOutOfBoundsException("too much data for RSA block");
            }
        }

        return null;
    }

    protected int engineUpdate(
        byte[]  input,
        int     inputOffset,
        int     inputLen,
        byte[]  output,
        int     outputOffset) 
    {
        bOut.write(input, inputOffset, inputLen);

        if (cipher instanceof RSABlindedEngine)
        {
            if (bOut.size() > cipher.getInputBlockSize() + 1)
            {
                throw new ArrayIndexOutOfBoundsException("too much data for RSA block");
            }
        }
        else
        {
            if (bOut.size() > cipher.getInputBlockSize())
            {
                throw new ArrayIndexOutOfBoundsException("too much data for RSA block");
            }
        }

        return 0;
    }

    protected byte[] engineDoFinal(
        byte[]  input,
        int     inputOffset,
        int     inputLen) 
        throws IllegalBlockSizeException, BadPaddingException
    {
        if (input != null)
        {
            bOut.write(input, inputOffset, inputLen);
        }

        if (cipher instanceof RSABlindedEngine)
        {
            if (bOut.size() > cipher.getInputBlockSize() + 1)
            {
                throw new ArrayIndexOutOfBoundsException("too much data for RSA block");
            }
        }
        else
        {
            if (bOut.size() > cipher.getInputBlockSize())
            {
                throw new ArrayIndexOutOfBoundsException("too much data for RSA block");
            }
        }

        try
        {
            byte[]  bytes = bOut.toByteArray();

            bOut.reset();

            return cipher.processBlock(bytes, 0, bytes.length);
        }
        catch (InvalidCipherTextException e)
        {
            throw new BadPaddingException(e.getMessage());
        }
    }

    protected int engineDoFinal(
        byte[]  input,
        int     inputOffset,
        int     inputLen,
        byte[]  output,
        int     outputOffset) 
        throws IllegalBlockSizeException, BadPaddingException
    {
        if (input != null)
        {
            bOut.write(input, inputOffset, inputLen);
        }

        if (cipher instanceof RSABlindedEngine)
        {
            if (bOut.size() > cipher.getInputBlockSize() + 1)
            {
                throw new ArrayIndexOutOfBoundsException("too much data for RSA block");
            }
        }
        else
        {
            if (bOut.size() > cipher.getInputBlockSize())
            {
                throw new ArrayIndexOutOfBoundsException("too much data for RSA block");
            }
        }

        byte[]  out;

        try
        {
            byte[]  bytes = bOut.toByteArray();
            bOut.reset();

            out = cipher.processBlock(bytes, 0, bytes.length);
        }
        catch (InvalidCipherTextException e)
        {
            throw new BadPaddingException(e.getMessage());
        }

        for (int i = 0; i != out.length; i++)
        {
            output[outputOffset + i] = out[i];
        }

        return out.length;
    }

    /**
     * classes that inherit from us.
     */

    static public class NoPadding
        extends JCERSACipher
    {
        public NoPadding()
        {
            super(new RSABlindedEngine());
        }
    }

    static public class PKCS1v1_5Padding
        extends JCERSACipher
    {
        public PKCS1v1_5Padding()
        {
            super(new PKCS1Encoding(new RSABlindedEngine()));
        }
    }

    static public class PKCS1v1_5Padding_PrivateOnly
        extends JCERSACipher
    {
        public PKCS1v1_5Padding_PrivateOnly()
        {
            super(false, true, new PKCS1Encoding(new RSABlindedEngine()));
        }
    }

    static public class PKCS1v1_5Padding_PublicOnly
        extends JCERSACipher
    {
        public PKCS1v1_5Padding_PublicOnly()
        {
            super(true, false, new PKCS1Encoding(new RSABlindedEngine()));
        }
    }

    static public class OAEPPadding
        extends JCERSACipher
    {
        public OAEPPadding()
        {
            super(OAEPParameterSpec.DEFAULT);
        }
    }
    
    static public class ISO9796d1Padding
        extends JCERSACipher
    {
        public ISO9796d1Padding()
        {
            super(new ISO9796d1Encoding(new RSABlindedEngine()));
        }
    }
}