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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 1.4.
package org.bouncycastle.jcajce.provider.symmetric.util;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.InvalidParameterException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.ShortBufferException;
import javax.crypto.interfaces.PBEKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.crypto.spec.RC2ParameterSpec;
import javax.crypto.spec.RC5ParameterSpec;
import org.bouncycastle.asn1.cms.GCMParameters;
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DataLengthException;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.OutputLengthException;
import org.bouncycastle.crypto.modes.AEADBlockCipher;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.modes.CCMBlockCipher;
import org.bouncycastle.crypto.modes.CFBBlockCipher;
import org.bouncycastle.crypto.modes.CTSBlockCipher;
import org.bouncycastle.crypto.modes.EAXBlockCipher;
import org.bouncycastle.crypto.modes.GCFBBlockCipher;
import org.bouncycastle.crypto.modes.GCMBlockCipher;
import org.bouncycastle.crypto.modes.GOFBBlockCipher;
import org.bouncycastle.crypto.modes.OCBBlockCipher;
import org.bouncycastle.crypto.modes.OFBBlockCipher;
import org.bouncycastle.crypto.modes.OpenPGPCFBBlockCipher;
import org.bouncycastle.crypto.modes.PGPCFBBlockCipher;
import org.bouncycastle.crypto.modes.SICBlockCipher;
import org.bouncycastle.crypto.paddings.BlockCipherPadding;
import org.bouncycastle.crypto.paddings.ISO10126d2Padding;
import org.bouncycastle.crypto.paddings.ISO7816d4Padding;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.paddings.TBCPadding;
import org.bouncycastle.crypto.paddings.X923Padding;
import org.bouncycastle.crypto.paddings.ZeroBytePadding;
import org.bouncycastle.crypto.params.AEADParameters;
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.RC2Parameters;
import org.bouncycastle.crypto.params.RC5Parameters;
import org.bouncycastle.jcajce.PBKDF1Key;
import org.bouncycastle.jcajce.PBKDF1KeyWithParameters;
import org.bouncycastle.jcajce.PKCS12Key;
import org.bouncycastle.jcajce.PKCS12KeyWithParameters;
import org.bouncycastle.jcajce.spec.GOST28147ParameterSpec;
import org.bouncycastle.jcajce.spec.RepeatedSecretKeySpec;
import org.bouncycastle.util.Strings;
public class BaseBlockCipher
extends BaseWrapCipher
implements PBE
{
private static final Class gcmSpecClass = lookup("javax.crypto.spec.GCMParameterSpec");
//
// specs we can handle.
//
private Class[] availableSpecs =
{
RC2ParameterSpec.class,
RC5ParameterSpec.class,
gcmSpecClass,
IvParameterSpec.class,
PBEParameterSpec.class,
GOST28147ParameterSpec.class
};
private BlockCipher baseEngine;
private BlockCipherProvider engineProvider;
private GenericBlockCipher cipher;
private ParametersWithIV ivParam;
private AEADParameters aeadParams;
private int keySizeInBits;
private int scheme = -1;
private int digest;
private int ivLength = 0;
private boolean padded;
private boolean fixedIv = true;
private PBEParameterSpec pbeSpec = null;
private String pbeAlgorithm = null;
private String modeName = null;
private static Class lookup(String className)
{
try
{
Class def = BaseBlockCipher.class.getClassLoader().loadClass(className);
return def;
}
catch (Exception e)
{
return null;
}
}
protected BaseBlockCipher(
BlockCipher engine)
{
baseEngine = engine;
cipher = new BufferedGenericBlockCipher(engine);
}
protected BaseBlockCipher(
BlockCipher engine,
int scheme,
int digest,
int keySizeInBits,
int ivLength)
{
baseEngine = engine;
this.scheme = scheme;
this.digest = digest;
this.keySizeInBits = keySizeInBits;
this.ivLength = ivLength;
cipher = new BufferedGenericBlockCipher(engine);
}
protected BaseBlockCipher(
BlockCipherProvider provider)
{
baseEngine = provider.get();
engineProvider = provider;
cipher = new BufferedGenericBlockCipher(provider.get());
}
protected BaseBlockCipher(
AEADBlockCipher engine)
{
baseEngine = engine.getUnderlyingCipher();
ivLength = baseEngine.getBlockSize();
cipher = new AEADGenericBlockCipher(engine);
}
protected BaseBlockCipher(
AEADBlockCipher engine,
boolean fixedIv,
int ivLength)
{
this.baseEngine = engine.getUnderlyingCipher();
this.fixedIv = fixedIv;
this.ivLength = ivLength;
this.cipher = new AEADGenericBlockCipher(engine);
}
protected BaseBlockCipher(
org.bouncycastle.crypto.BlockCipher engine,
int ivLength)
{
baseEngine = engine;
this.cipher = new BufferedGenericBlockCipher(engine);
this.ivLength = ivLength / 8;
}
protected BaseBlockCipher(
BufferedBlockCipher engine,
int ivLength)
{
baseEngine = engine.getUnderlyingCipher();
this.cipher = new BufferedGenericBlockCipher(engine);
this.ivLength = ivLength / 8;
}
protected int engineGetBlockSize()
{
return baseEngine.getBlockSize();
}
protected byte[] engineGetIV()
{
if (aeadParams != null)
{
return aeadParams.getNonce();
}
return (ivParam != null) ? ivParam.getIV() : null;
}
protected int engineGetKeySize(
Key key)
{
return key.getEncoded().length * 8;
}
protected int engineGetOutputSize(
int inputLen)
{
return cipher.getOutputSize(inputLen);
}
protected AlgorithmParameters engineGetParameters()
{
if (engineParams == null)
{
if (pbeSpec != null)
{
try
{
engineParams = createParametersInstance(pbeAlgorithm);
engineParams.init(pbeSpec);
}
catch (Exception e)
{
return null;
}
}
else if (ivParam != null)
{
String name = cipher.getUnderlyingCipher().getAlgorithmName();
if (name.indexOf('/') >= 0)
{
name = name.substring(0, name.indexOf('/'));
}
try
{
engineParams = createParametersInstance(name);
engineParams.init(ivParam.getIV());
}
catch (Exception e)
{
throw new RuntimeException(e.toString());
}
}
else if (aeadParams != null)
{
try
{
engineParams = createParametersInstance("GCM");
engineParams.init(new GCMParameters(aeadParams.getNonce(), aeadParams.getMacSize() / 8).getEncoded());
}
catch (Exception e)
{
throw new RuntimeException(e.toString());
}
}
}
return engineParams;
}
protected void engineSetMode(
String mode)
throws NoSuchAlgorithmException
{
modeName = Strings.toUpperCase(mode);
if (modeName.equals("ECB"))
{
ivLength = 0;
cipher = new BufferedGenericBlockCipher(baseEngine);
}
else if (modeName.equals("CBC"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(
new CBCBlockCipher(baseEngine));
}
else if (modeName.startsWith("OFB"))
{
ivLength = baseEngine.getBlockSize();
if (modeName.length() != 3)
{
int wordSize = Integer.parseInt(modeName.substring(3));
cipher = new BufferedGenericBlockCipher(
new OFBBlockCipher(baseEngine, wordSize));
}
else
{
cipher = new BufferedGenericBlockCipher(
new OFBBlockCipher(baseEngine, 8 * baseEngine.getBlockSize()));
}
}
else if (modeName.startsWith("CFB"))
{
ivLength = baseEngine.getBlockSize();
if (modeName.length() != 3)
{
int wordSize = Integer.parseInt(modeName.substring(3));
cipher = new BufferedGenericBlockCipher(
new CFBBlockCipher(baseEngine, wordSize));
}
else
{
cipher = new BufferedGenericBlockCipher(
new CFBBlockCipher(baseEngine, 8 * baseEngine.getBlockSize()));
}
}
else if (modeName.startsWith("PGP"))
{
boolean inlineIV = modeName.equalsIgnoreCase("PGPCFBwithIV");
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(
new PGPCFBBlockCipher(baseEngine, inlineIV));
}
else if (modeName.equalsIgnoreCase("OpenPGPCFB"))
{
ivLength = 0;
cipher = new BufferedGenericBlockCipher(
new OpenPGPCFBBlockCipher(baseEngine));
}
else if (modeName.startsWith("SIC"))
{
ivLength = baseEngine.getBlockSize();
if (ivLength < 16)
{
throw new IllegalArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)");
}
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(
new SICBlockCipher(baseEngine)));
}
else if (modeName.startsWith("CTR"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(
new SICBlockCipher(baseEngine)));
}
else if (modeName.startsWith("GOFB"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(
new GOFBBlockCipher(baseEngine)));
}
else if (modeName.startsWith("GCFB"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(
new GCFBBlockCipher(baseEngine)));
}
else if (modeName.startsWith("CTS"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(new CTSBlockCipher(new CBCBlockCipher(baseEngine)));
}
else if (modeName.startsWith("CCM"))
{
ivLength = 13; // CCM nonce 7..13 bytes
cipher = new AEADGenericBlockCipher(new CCMBlockCipher(baseEngine));
}
else if (modeName.startsWith("OCB"))
{
if (engineProvider != null)
{
/*
* RFC 7253 4.2. Nonce is a string of no more than 120 bits
*/
ivLength = 15;
cipher = new AEADGenericBlockCipher(new OCBBlockCipher(baseEngine, engineProvider.get()));
}
else
{
throw new NoSuchAlgorithmException("can't support mode " + mode);
}
}
else if (modeName.startsWith("EAX"))
{
ivLength = baseEngine.getBlockSize();
cipher = new AEADGenericBlockCipher(new EAXBlockCipher(baseEngine));
}
else if (modeName.startsWith("GCM"))
{
ivLength = baseEngine.getBlockSize();
cipher = new AEADGenericBlockCipher(new GCMBlockCipher(baseEngine));
}
else
{
throw new NoSuchAlgorithmException("can't support mode " + mode);
}
}
protected void engineSetPadding(
String padding)
throws NoSuchPaddingException
{
String paddingName = Strings.toUpperCase(padding);
if (paddingName.equals("NOPADDING"))
{
if (cipher.wrapOnNoPadding())
{
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(cipher.getUnderlyingCipher()));
}
}
else if (paddingName.equals("WITHCTS"))
{
cipher = new BufferedGenericBlockCipher(new CTSBlockCipher(cipher.getUnderlyingCipher()));
}
else
{
padded = true;
if (isAEADModeName(modeName))
{
throw new NoSuchPaddingException("Only NoPadding can be used with AEAD modes.");
}
else if (paddingName.equals("PKCS5PADDING") || paddingName.equals("PKCS7PADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher());
}
else if (paddingName.equals("ZEROBYTEPADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new ZeroBytePadding());
}
else if (paddingName.equals("ISO10126PADDING") || paddingName.equals("ISO10126-2PADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new ISO10126d2Padding());
}
else if (paddingName.equals("X9.23PADDING") || paddingName.equals("X923PADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new X923Padding());
}
else if (paddingName.equals("ISO7816-4PADDING") || paddingName.equals("ISO9797-1PADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new ISO7816d4Padding());
}
else if (paddingName.equals("TBCPADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new TBCPadding());
}
else
{
throw new NoSuchPaddingException("Padding " + padding + " unknown.");
}
}
}
protected void engineInit(
int opmode,
Key key,
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
CipherParameters param;
this.pbeSpec = null;
this.pbeAlgorithm = null;
this.engineParams = null;
this.aeadParams = null;
//
// basic key check
//
if (!(key instanceof SecretKey))
{
throw new InvalidKeyException("Key for algorithm " + key.getAlgorithm() + " not suitable for symmetric enryption.");
}
//
// for RC5-64 we must have some default parameters
//
if (params == null && baseEngine.getAlgorithmName().startsWith("RC5-64"))
{
throw new InvalidAlgorithmParameterException("RC5 requires an RC5ParametersSpec to be passed in.");
}
//
// a note on iv's - if ivLength is zero the IV gets ignored (we don't use it).
//
if (scheme == PKCS12 || key instanceof PKCS12Key)
{
SecretKey k;
try
{
k = (SecretKey)key;
}
catch (Exception e)
{
throw new InvalidKeyException("PKCS12 requires a SecretKey/PBEKey");
}
if (params instanceof PBEParameterSpec)
{
pbeSpec = (PBEParameterSpec)params;
}
if (k instanceof PBEKey && pbeSpec == null)
{
pbeSpec = new PBEParameterSpec(((PBEKey)k).getSalt(), ((PBEKey)k).getIterationCount());
}
if (pbeSpec == null && !(k instanceof PBEKey))
{
throw new InvalidKeyException("Algorithm requires a PBE key");
}
if (key instanceof BCPBEKey)
{
if (((BCPBEKey)key).getParam() != null)
{
param = ((BCPBEKey)key).getParam();
}
else
{
param = PBE.Util.makePBEParameters(k.getEncoded(), PKCS12, digest, keySizeInBits, ivLength * 8, pbeSpec, cipher.getAlgorithmName());
}
}
else
{
param = PBE.Util.makePBEParameters(k.getEncoded(), PKCS12, digest, keySizeInBits, ivLength * 8, pbeSpec, cipher.getAlgorithmName());
}
if (param instanceof ParametersWithIV)
{
ivParam = (ParametersWithIV)param;
}
}
else if (key instanceof PBKDF1Key)
{
PBKDF1Key k = (PBKDF1Key)key;
if (params instanceof PBEParameterSpec)
{
pbeSpec = (PBEParameterSpec)params;
}
if (k instanceof PBKDF1KeyWithParameters && pbeSpec == null)
{
pbeSpec = new PBEParameterSpec(((PBKDF1KeyWithParameters)k).getSalt(), ((PBKDF1KeyWithParameters)k).getIterationCount());
}
param = PBE.Util.makePBEParameters(k.getEncoded(), PKCS5S1, digest, keySizeInBits, ivLength * 8, pbeSpec, cipher.getAlgorithmName());
if (param instanceof ParametersWithIV)
{
ivParam = (ParametersWithIV)param;
}
}
else if (key instanceof BCPBEKey)
{
BCPBEKey k = (BCPBEKey)key;
if (k.getOID() != null)
{
pbeAlgorithm = k.getOID().getId();
}
else
{
pbeAlgorithm = k.getAlgorithm();
}
if (k.getParam() != null)
{
param = adjustParameters(params, k.getParam());
}
else if (params instanceof PBEParameterSpec)
{
pbeSpec = (PBEParameterSpec)params;
param = PBE.Util.makePBEParameters(k, params, cipher.getUnderlyingCipher().getAlgorithmName());
}
else
{
throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
}
if (param instanceof ParametersWithIV)
{
ivParam = (ParametersWithIV)param;
}
}
else if (key instanceof PBEKey)
{
PBEKey k = (PBEKey)key;
pbeSpec = (PBEParameterSpec)params;
if (k instanceof PKCS12KeyWithParameters && pbeSpec == null)
{
pbeSpec = new PBEParameterSpec(k.getSalt(), k.getIterationCount());
}
param = PBE.Util.makePBEParameters(k.getEncoded(), scheme, digest, keySizeInBits, ivLength * 8, pbeSpec, cipher.getAlgorithmName());
if (param instanceof ParametersWithIV)
{
ivParam = (ParametersWithIV)param;
}
}
else if (!(key instanceof RepeatedSecretKeySpec))
{
if (scheme == PKCS5S1 || scheme == PKCS5S1_UTF8 || scheme == PKCS5S2 || scheme == PKCS5S2_UTF8)
{
throw new InvalidKeyException("Algorithm requires a PBE key");
}
param = new KeyParameter(key.getEncoded());
}
else
{
param = null;
}
if (params instanceof IvParameterSpec)
{
if (ivLength != 0)
{
IvParameterSpec p = (IvParameterSpec)params;
if (p.getIV().length != ivLength && !(cipher instanceof AEADGenericBlockCipher) && fixedIv)
{
throw new InvalidAlgorithmParameterException("IV must be " + ivLength + " bytes long.");
}
if (param instanceof ParametersWithIV)
{
param = new ParametersWithIV(((ParametersWithIV)param).getParameters(), p.getIV());
}
else
{
param = new ParametersWithIV(param, p.getIV());
}
ivParam = (ParametersWithIV)param;
}
else
{
if (modeName != null && modeName.equals("ECB"))
{
throw new InvalidAlgorithmParameterException("ECB mode does not use an IV");
}
}
}
else if (params instanceof GOST28147ParameterSpec)
{
GOST28147ParameterSpec gost28147Param = (GOST28147ParameterSpec)params;
param = new ParametersWithSBox(
new KeyParameter(key.getEncoded()), ((GOST28147ParameterSpec)params).getSbox());
if (gost28147Param.getIV() != null && ivLength != 0)
{
if (param instanceof ParametersWithIV)
{
param = new ParametersWithIV(((ParametersWithIV)param).getParameters(), gost28147Param.getIV());
}
else
{
param = new ParametersWithIV(param, gost28147Param.getIV());
}
ivParam = (ParametersWithIV)param;
}
}
else if (params instanceof RC2ParameterSpec)
{
RC2ParameterSpec rc2Param = (RC2ParameterSpec)params;
param = new RC2Parameters(key.getEncoded(), ((RC2ParameterSpec)params).getEffectiveKeyBits());
if (rc2Param.getIV() != null && ivLength != 0)
{
if (param instanceof ParametersWithIV)
{
param = new ParametersWithIV(((ParametersWithIV)param).getParameters(), rc2Param.getIV());
}
else
{
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 (baseEngine.getAlgorithmName().startsWith("RC5"))
{
if (baseEngine.getAlgorithmName().equals("RC5-32"))
{
if (rc5Param.getWordSize() != 32)
{
throw new InvalidAlgorithmParameterException("RC5 already set up for a word size of 32 not " + rc5Param.getWordSize() + ".");
}
}
else if (baseEngine.getAlgorithmName().equals("RC5-64"))
{
if (rc5Param.getWordSize() != 64)
{
throw new InvalidAlgorithmParameterException("RC5 already set up for a word size of 64 not " + rc5Param.getWordSize() + ".");
}
}
}
else
{
throw new InvalidAlgorithmParameterException("RC5 parameters passed to a cipher that is not RC5.");
}
if ((rc5Param.getIV() != null) && (ivLength != 0))
{
if (param instanceof ParametersWithIV)
{
param = new ParametersWithIV(((ParametersWithIV)param).getParameters(), rc5Param.getIV());
}
else
{
param = new ParametersWithIV(param, rc5Param.getIV());
}
ivParam = (ParametersWithIV)param;
}
}
else if (gcmSpecClass != null && gcmSpecClass.isInstance(params))
{
if (!isAEADModeName(modeName) && !(cipher instanceof AEADGenericBlockCipher))
{
throw new InvalidAlgorithmParameterException("GCMParameterSpec can only be used with AEAD modes.");
}
try
{
Method tLen = gcmSpecClass.getDeclaredMethod("getTLen", new Class[0]);
Method iv= gcmSpecClass.getDeclaredMethod("getIV", new Class[0]);
KeyParameter keyParam;
if (param instanceof ParametersWithIV)
{
keyParam = (KeyParameter)((ParametersWithIV)param).getParameters();
}
else
{
keyParam = (KeyParameter)param;
}
param = aeadParams = new AEADParameters(keyParam, ((Integer)tLen.invoke(params, new Object[0])).intValue(), (byte[])iv.invoke(params, new Object[0]));
}
catch (Exception e)
{
throw new InvalidAlgorithmParameterException("Cannot process GCMParameterSpec.");
}
}
else if (params != null && !(params instanceof PBEParameterSpec))
{
throw new InvalidAlgorithmParameterException("unknown parameter type.");
}
if ((ivLength != 0) && !(param instanceof ParametersWithIV) && !(param instanceof AEADParameters))
{
SecureRandom ivRandom = random;
if (ivRandom == null)
{
ivRandom = new SecureRandom();
}
if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE))
{
byte[] iv = new byte[ivLength];
ivRandom.nextBytes(iv);
param = new ParametersWithIV(param, iv);
ivParam = (ParametersWithIV)param;
}
else if (cipher.getUnderlyingCipher().getAlgorithmName().indexOf("PGPCFB") < 0)
{
throw new InvalidAlgorithmParameterException("no IV set when one expected");
}
}
if (random != null && padded)
{
param = new ParametersWithRandom(param, random);
}
try
{
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");
}
}
catch (final Exception e)
{
throw new InvalidKeyException(e.getMessage())
{
public Throwable getCause()
{
return e;
}
};
}
}
private CipherParameters adjustParameters(AlgorithmParameterSpec params, CipherParameters param)
{
CipherParameters key;
if (param instanceof ParametersWithIV)
{
key = ((ParametersWithIV)param).getParameters();
if (params instanceof IvParameterSpec)
{
IvParameterSpec iv = (IvParameterSpec)params;
ivParam = new ParametersWithIV(key, iv.getIV());
param = ivParam;
}
else if (params instanceof GOST28147ParameterSpec)
{
// need to pick up IV and SBox.
GOST28147ParameterSpec gost28147Param = (GOST28147ParameterSpec)params;
param = new ParametersWithSBox(param, gost28147Param.getSbox());
if (gost28147Param.getIV() != null && ivLength != 0)
{
ivParam = new ParametersWithIV(key, gost28147Param.getIV());
param = ivParam;
}
}
}
else
{
if (params instanceof IvParameterSpec)
{
IvParameterSpec iv = (IvParameterSpec)params;
ivParam = new ParametersWithIV(param, iv.getIV());
param = ivParam;
}
else if (params instanceof GOST28147ParameterSpec)
{
// need to pick up IV and SBox.
GOST28147ParameterSpec gost28147Param = (GOST28147ParameterSpec)params;
param = new ParametersWithSBox(param, gost28147Param.getSbox());
if (gost28147Param.getIV() != null && ivLength != 0)
{
param = new ParametersWithIV(param, gost28147Param.getIV());
}
}
}
return param;
}
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++)
{
if (availableSpecs[i] == null)
{
continue;
}
try
{
paramSpec = params.getParameterSpec(availableSpecs[i]);
break;
}
catch (Exception e)
{
// try again if possible
}
}
if (paramSpec == null)
{
throw new InvalidAlgorithmParameterException("can't handle parameter " + params.toString());
}
}
engineInit(opmode, key, paramSpec, random);
engineParams = params;
}
protected void engineInit(
int opmode,
Key key,
SecureRandom random)
throws InvalidKeyException
{
try
{
engineInit(opmode, key, (AlgorithmParameterSpec)null, random);
}
catch (InvalidAlgorithmParameterException e)
{
throw new InvalidKeyException(e.getMessage());
}
}
protected void engineUpdateAAD(byte[] input, int offset, int length)
{
cipher.updateAAD(input, offset, length);
}
protected void engineUpdateAAD(ByteBuffer bytebuffer)
{
int offset = bytebuffer.arrayOffset() + bytebuffer.position();
int length = bytebuffer.limit() - bytebuffer.position();
engineUpdateAAD(bytebuffer.array(), offset, length);
}
protected byte[] engineUpdate(
byte[] input,
int inputOffset,
int inputLen)
{
int length = cipher.getUpdateOutputSize(inputLen);
if (length > 0)
{
byte[] out = new byte[length];
int len = cipher.processBytes(input, inputOffset, inputLen, out, 0);
if (len == 0)
{
return null;
}
else if (len != out.length)
{
byte[] tmp = new byte[len];
System.arraycopy(out, 0, tmp, 0, len);
return tmp;
}
return out;
}
cipher.processBytes(input, inputOffset, inputLen, null, 0);
return null;
}
protected int engineUpdate(
byte[] input,
int inputOffset,
int inputLen,
byte[] output,
int outputOffset)
throws ShortBufferException
{
if (outputOffset + cipher.getUpdateOutputSize(inputLen) > output.length)
{
throw new ShortBufferException("output buffer too short for input.");
}
try
{
return cipher.processBytes(input, inputOffset, inputLen, output, outputOffset);
}
catch (DataLengthException e)
{
// should never occur
throw new IllegalStateException(e.toString());
}
}
protected byte[] engineDoFinal(
byte[] input,
int inputOffset,
int inputLen)
throws IllegalBlockSizeException, BadPaddingException
{
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());
}
if (len == tmp.length)
{
return tmp;
}
byte[] out = new byte[len];
System.arraycopy(tmp, 0, out, 0, len);
return out;
}
protected int engineDoFinal(
byte[] input,
int inputOffset,
int inputLen,
byte[] output,
int outputOffset)
throws IllegalBlockSizeException, BadPaddingException, ShortBufferException
{
int len = 0;
if (outputOffset + engineGetOutputSize(inputLen) > output.length)
{
throw new ShortBufferException("output buffer too short for input.");
}
try
{
if (inputLen != 0)
{
len = cipher.processBytes(input, inputOffset, inputLen, output, outputOffset);
}
return (len + cipher.doFinal(output, outputOffset + len));
}
catch (OutputLengthException e)
{
throw new IllegalBlockSizeException(e.getMessage());
}
catch (DataLengthException e)
{
throw new IllegalBlockSizeException(e.getMessage());
}
}
private boolean isAEADModeName(
String modeName)
{
return "CCM".equals(modeName) || "EAX".equals(modeName) || "GCM".equals(modeName) || "OCB".equals(modeName);
}
/*
* The ciphers that inherit from us.
*/
static private interface GenericBlockCipher
{
public void init(boolean forEncryption, CipherParameters params)
throws IllegalArgumentException;
public boolean wrapOnNoPadding();
public String getAlgorithmName();
public org.bouncycastle.crypto.BlockCipher getUnderlyingCipher();
public int getOutputSize(int len);
public int getUpdateOutputSize(int len);
public void updateAAD(byte[] input, int offset, int length);
public int processByte(byte in, byte[] out, int outOff)
throws DataLengthException;
public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff)
throws DataLengthException;
public int doFinal(byte[] out, int outOff)
throws IllegalStateException,
BadPaddingException;
}
private static class BufferedGenericBlockCipher
implements GenericBlockCipher
{
private BufferedBlockCipher cipher;
BufferedGenericBlockCipher(BufferedBlockCipher cipher)
{
this.cipher = cipher;
}
BufferedGenericBlockCipher(org.bouncycastle.crypto.BlockCipher cipher)
{
this.cipher = new PaddedBufferedBlockCipher(cipher);
}
BufferedGenericBlockCipher(org.bouncycastle.crypto.BlockCipher cipher, BlockCipherPadding padding)
{
this.cipher = new PaddedBufferedBlockCipher(cipher, padding);
}
public void init(boolean forEncryption, CipherParameters params)
throws IllegalArgumentException
{
cipher.init(forEncryption, params);
}
public boolean wrapOnNoPadding()
{
return !(cipher instanceof CTSBlockCipher);
}
public String getAlgorithmName()
{
return cipher.getUnderlyingCipher().getAlgorithmName();
}
public org.bouncycastle.crypto.BlockCipher getUnderlyingCipher()
{
return cipher.getUnderlyingCipher();
}
public int getOutputSize(int len)
{
return cipher.getOutputSize(len);
}
public int getUpdateOutputSize(int len)
{
return cipher.getUpdateOutputSize(len);
}
public void updateAAD(byte[] input, int offset, int length)
{
throw new UnsupportedOperationException("AAD is not supported in the current mode.");
}
public int processByte(byte in, byte[] out, int outOff) throws DataLengthException
{
return cipher.processByte(in, out, outOff);
}
public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException
{
return cipher.processBytes(in, inOff, len, out, outOff);
}
public int doFinal(byte[] out, int outOff) throws IllegalStateException, BadPaddingException
{
try
{
return cipher.doFinal(out, outOff);
}
catch (InvalidCipherTextException e)
{
throw new BadPaddingException(e.getMessage());
}
}
}
private static class AEADGenericBlockCipher
implements GenericBlockCipher
{
private static final Constructor aeadBadTagConstructor;
static {
Class aeadBadTagClass = lookup("javax.crypto.AEADBadTagException");
if (aeadBadTagClass != null)
{
aeadBadTagConstructor = findExceptionConstructor(aeadBadTagClass);
}
else
{
aeadBadTagConstructor = null;
}
}
private static Constructor findExceptionConstructor(Class clazz)
{
try
{
return clazz.getConstructor(new Class[]{String.class});
}
catch (Exception e)
{
return null;
}
}
private AEADBlockCipher cipher;
AEADGenericBlockCipher(AEADBlockCipher cipher)
{
this.cipher = cipher;
}
public void init(boolean forEncryption, CipherParameters params)
throws IllegalArgumentException
{
cipher.init(forEncryption, params);
}
public String getAlgorithmName()
{
return cipher.getUnderlyingCipher().getAlgorithmName();
}
public boolean wrapOnNoPadding()
{
return false;
}
public org.bouncycastle.crypto.BlockCipher getUnderlyingCipher()
{
return cipher.getUnderlyingCipher();
}
public int getOutputSize(int len)
{
return cipher.getOutputSize(len);
}
public int getUpdateOutputSize(int len)
{
return cipher.getUpdateOutputSize(len);
}
public void updateAAD(byte[] input, int offset, int length)
{
cipher.processAADBytes(input, offset, length);
}
public int processByte(byte in, byte[] out, int outOff) throws DataLengthException
{
return cipher.processByte(in, out, outOff);
}
public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException
{
return cipher.processBytes(in, inOff, len, out, outOff);
}
public int doFinal(byte[] out, int outOff) throws IllegalStateException, BadPaddingException
{
try
{
return cipher.doFinal(out, outOff);
}
catch (InvalidCipherTextException e)
{
if (aeadBadTagConstructor != null)
{
BadPaddingException aeadBadTag = null;
try
{
aeadBadTag = (BadPaddingException)aeadBadTagConstructor
.newInstance(new Object[]{e.getMessage()});
}
catch (Exception i)
{
// Shouldn't happen, but fall through to BadPaddingException
}
if (aeadBadTag != null)
{
throw aeadBadTag;
}
}
throw new BadPaddingException(e.getMessage());
}
}
}
}
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