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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.
package org.bouncycastle.jcajce.provider.symmetric.util;
import java.io.ByteArrayOutputStream;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.InvalidParameterException;
import java.security.Key;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.CipherSpi;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.ShortBufferException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.crypto.spec.RC2ParameterSpec;
import javax.crypto.spec.RC5ParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.Wrapper;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.params.ParametersWithSBox;
import org.bouncycastle.crypto.params.ParametersWithUKM;
import org.bouncycastle.jcajce.spec.GOST28147WrapParameterSpec;
import org.bouncycastle.jcajce.util.BCJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.Arrays;
public abstract class BaseWrapCipher
extends CipherSpi
implements PBE
{
//
// specs we can handle.
//
private Class[] availableSpecs =
{
GOST28147WrapParameterSpec.class,
PBEParameterSpec.class,
RC2ParameterSpec.class,
RC5ParameterSpec.class,
IvParameterSpec.class
};
protected int pbeType = PKCS12;
protected int pbeHash = SHA1;
protected int pbeKeySize;
protected int pbeIvSize;
protected AlgorithmParameters engineParams = null;
protected Wrapper wrapEngine = null;
private int ivSize;
private byte[] iv;
private ErasableOutputStream wrapStream = null;
private boolean forWrapping;
private final JcaJceHelper helper = new BCJcaJceHelper();
protected BaseWrapCipher()
{
}
protected BaseWrapCipher(
Wrapper wrapEngine)
{
this(wrapEngine, 0);
}
protected BaseWrapCipher(
Wrapper wrapEngine,
int ivSize)
{
this.wrapEngine = wrapEngine;
this.ivSize = ivSize;
}
protected int engineGetBlockSize()
{
return 0;
}
protected byte[] engineGetIV()
{
return Arrays.clone(iv);
}
protected int engineGetKeySize(
Key key)
{
return key.getEncoded().length * 8;
}
protected int engineGetOutputSize(
int inputLen)
{
return -1;
}
protected AlgorithmParameters engineGetParameters()
{
if (engineParams == null)
{
if (iv != null)
{
String name = wrapEngine.getAlgorithmName();
if (name.indexOf('/') >= 0)
{
name = name.substring(0, name.indexOf('/'));
}
try
{
engineParams = createParametersInstance(name);
engineParams.init(new IvParameterSpec(iv));
}
catch (Exception e)
{
throw new RuntimeException(e.toString());
}
}
}
return engineParams;
}
protected final AlgorithmParameters createParametersInstance(String algorithm)
throws NoSuchAlgorithmException, NoSuchProviderException
{
return helper.createAlgorithmParameters(algorithm);
}
protected void engineSetMode(
String mode)
throws NoSuchAlgorithmException
{
throw new NoSuchAlgorithmException("can't support mode " + mode);
}
protected void engineSetPadding(
String padding)
throws NoSuchPaddingException
{
throw new NoSuchPaddingException("Padding " + padding + " unknown.");
}
protected void engineInit(
int opmode,
Key key,
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
CipherParameters param;
if (key instanceof BCPBEKey)
{
BCPBEKey k = (BCPBEKey)key;
if (params instanceof PBEParameterSpec)
{
param = PBE.Util.makePBEParameters(k, params, wrapEngine.getAlgorithmName());
}
else if (k.getParam() != null)
{
param = k.getParam();
}
else
{
throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
}
}
else
{
param = new KeyParameter(key.getEncoded());
}
if (params instanceof IvParameterSpec)
{
IvParameterSpec ivSpec = (IvParameterSpec)params;
this.iv = ivSpec.getIV();
param = new ParametersWithIV(param, iv);
}
if (params instanceof GOST28147WrapParameterSpec)
{
GOST28147WrapParameterSpec spec = (GOST28147WrapParameterSpec) params;
byte[] sBox = spec.getSBox();
if (sBox != null)
{
param = new ParametersWithSBox(param, sBox);
}
param = new ParametersWithUKM(param, spec.getUKM());
}
if (param instanceof KeyParameter && ivSize != 0)
{
if (opmode == Cipher.WRAP_MODE || opmode == Cipher.ENCRYPT_MODE)
{
iv = new byte[ivSize];
random.nextBytes(iv);
param = new ParametersWithIV(param, iv);
}
}
if (random != null)
{
param = new ParametersWithRandom(param, random);
}
try
{
switch (opmode)
{
case Cipher.WRAP_MODE:
wrapEngine.init(true, param);
this.wrapStream = null;
this.forWrapping = true;
break;
case Cipher.UNWRAP_MODE:
wrapEngine.init(false, param);
this.wrapStream = null;
this.forWrapping = false;
break;
case Cipher.ENCRYPT_MODE:
wrapEngine.init(true, param);
this.wrapStream = new ErasableOutputStream();
this.forWrapping = true;
break;
case Cipher.DECRYPT_MODE:
wrapEngine.init(false, param);
this.wrapStream = new ErasableOutputStream();
this.forWrapping = false;
break;
default:
throw new InvalidParameterException("Unknown mode parameter passed to init.");
}
}
catch (Exception e)
{
throw new InvalidKeyOrParametersException(e.getMessage(), e);
}
}
protected void engineInit(
int opmode,
Key key,
AlgorithmParameters params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
AlgorithmParameterSpec paramSpec = null;
if (params != null)
{
for (int i = 0; i != availableSpecs.length; i++)
{
try
{
paramSpec = params.getParameterSpec(availableSpecs[i]);
break;
}
catch (Exception e)
{
// try next spec
}
}
if (paramSpec == null)
{
throw new InvalidAlgorithmParameterException("can't handle parameter " + params.toString());
}
}
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)
{
throw new InvalidKeyOrParametersException(e.getMessage(), e);
}
}
protected byte[] engineUpdate(
byte[] input,
int inputOffset,
int inputLen)
{
if (wrapStream == null)
{
throw new IllegalStateException("not supported in a wrapping mode");
}
wrapStream.write(input, inputOffset, inputLen);
return null;
}
protected int engineUpdate(
byte[] input,
int inputOffset,
int inputLen,
byte[] output,
int outputOffset)
throws ShortBufferException
{
if (wrapStream == null)
{
throw new IllegalStateException("not supported in a wrapping mode");
}
wrapStream.write(input, inputOffset, inputLen);
return 0;
}
protected byte[] engineDoFinal(
byte[] input,
int inputOffset,
int inputLen)
throws IllegalBlockSizeException, BadPaddingException
{
if (wrapStream == null)
{
throw new IllegalStateException("not supported in a wrapping mode");
}
if (input != null)
{
wrapStream.write(input, inputOffset, inputLen);
}
try
{
if (forWrapping)
{
try
{
return wrapEngine.wrap(wrapStream.getBuf(), 0, wrapStream.size());
}
catch (Exception e)
{
throw new IllegalBlockSizeException(e.getMessage());
}
}
else
{
try
{
return wrapEngine.unwrap(wrapStream.getBuf(), 0, wrapStream.size());
}
catch (InvalidCipherTextException e)
{
throw new BadPaddingException(e.getMessage());
}
}
}
finally
{
wrapStream.erase();
}
}
protected int engineDoFinal(
byte[] input,
int inputOffset,
int inputLen,
byte[] output,
int outputOffset)
throws IllegalBlockSizeException, BadPaddingException, ShortBufferException
{
if (wrapStream == null)
{
throw new IllegalStateException("not supported in a wrapping mode");
}
wrapStream.write(input, inputOffset, inputLen);
try
{
byte[] enc;
if (forWrapping)
{
try
{
enc = wrapEngine.wrap(wrapStream.getBuf(), 0, wrapStream.size());
}
catch (Exception e)
{
throw new IllegalBlockSizeException(e.getMessage());
}
}
else
{
try
{
enc = wrapEngine.unwrap(wrapStream.getBuf(), 0, wrapStream.size());
}
catch (InvalidCipherTextException e)
{
throw new BadPaddingException(e.getMessage());
}
}
if (outputOffset + enc.length > output.length)
{
throw new ShortBufferException("output buffer too short for input.");
}
System.arraycopy(enc, 0, output, outputOffset, enc.length);
return enc.length;
}
finally
{
wrapStream.erase();
}
}
protected byte[] engineWrap(
Key key)
throws IllegalBlockSizeException, InvalidKeyException
{
byte[] encoded = key.getEncoded();
if (encoded == null)
{
throw new InvalidKeyException("Cannot wrap key, null encoding.");
}
try
{
if (wrapEngine == null)
{
return engineDoFinal(encoded, 0, encoded.length);
}
else
{
return wrapEngine.wrap(encoded, 0, encoded.length);
}
}
catch (BadPaddingException e)
{
throw new IllegalBlockSizeException(e.getMessage());
}
}
protected Key engineUnwrap(
byte[] wrappedKey,
String wrappedKeyAlgorithm,
int wrappedKeyType)
throws InvalidKeyException, NoSuchAlgorithmException
{
byte[] encoded;
try
{
if (wrapEngine == null)
{
encoded = engineDoFinal(wrappedKey, 0, wrappedKey.length);
}
else
{
encoded = wrapEngine.unwrap(wrappedKey, 0, wrappedKey.length);
}
}
catch (InvalidCipherTextException e)
{
throw new InvalidKeyException(e.getMessage());
}
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 if (wrappedKeyAlgorithm.equals("") && wrappedKeyType == Cipher.PRIVATE_KEY)
{
/*
* The caller doesn't know the algorithm as it is part of
* the encrypted data.
*/
try
{
PrivateKeyInfo in = PrivateKeyInfo.getInstance(encoded);
PrivateKey privKey = BouncyCastleProvider.getPrivateKey(in);
if (privKey != null)
{
return privKey;
}
else
{
throw new InvalidKeyException("algorithm " + in.getPrivateKeyAlgorithm().getAlgorithm() + " not supported");
}
}
catch (Exception e)
{
throw new InvalidKeyException("Invalid key encoding.");
}
}
else
{
try
{
KeyFactory kf = helper.createKeyFactory(wrappedKeyAlgorithm);
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 (InvalidKeySpecException e2)
{
throw new InvalidKeyException("Unknown key type " + e2.getMessage());
}
throw new InvalidKeyException("Unknown key type " + wrappedKeyType);
}
}
protected static final class ErasableOutputStream
extends ByteArrayOutputStream
{
public ErasableOutputStream()
{
}
public byte[] getBuf()
{
return buf;
}
public void erase()
{
Arrays.fill(this.buf, (byte)0);
reset();
}
}
protected static class InvalidKeyOrParametersException
extends InvalidKeyException
{
private final Throwable cause;
InvalidKeyOrParametersException(String msg, Throwable cause)
{
super(msg);
this.cause = cause;
}
public Throwable getCause()
{
return cause;
}
}
}
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