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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.asymmetric.rsa;
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.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import org.bouncycastle.crypto.AsymmetricBlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.CryptoServicesRegistrar;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.digests.MD5Digest;
import org.bouncycastle.crypto.digests.SHA224Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.digests.SHA384Digest;
import org.bouncycastle.crypto.digests.SHA512Digest;
import org.bouncycastle.crypto.encodings.ISO9796d1Encoding;
import org.bouncycastle.crypto.encodings.OAEPEncoding;
import org.bouncycastle.crypto.encodings.PKCS1Encoding;
import org.bouncycastle.crypto.engines.RSABlindedEngine;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.jcajce.provider.asymmetric.util.BaseCipherSpi;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.Strings;
import org.bouncycastle.jcajce.util.BCJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
public class CipherSpi
extends BaseCipherSpi
{
private final JcaJceHelper helper = new BCJcaJceHelper();
private AsymmetricBlockCipher cipher;
private AlgorithmParameterSpec paramSpec;
private AlgorithmParameters engineParams;
private boolean publicKeyOnly = false;
private boolean privateKeyOnly = false;
private ByteArrayOutputStream bOut = new ByteArrayOutputStream();
public CipherSpi(
AsymmetricBlockCipher engine)
{
cipher = engine;
}
public CipherSpi(
boolean publicKeyOnly,
boolean privateKeyOnly,
AsymmetricBlockCipher engine)
{
this.publicKeyOnly = publicKeyOnly;
this.privateKeyOnly = privateKeyOnly;
cipher = engine;
}
protected int engineGetBlockSize()
{
try
{
return cipher.getInputBlockSize();
}
catch (NullPointerException e)
{
throw new IllegalStateException("RSA Cipher not initialised");
}
}
protected int engineGetKeySize(
Key key)
{
if (key instanceof RSAPrivateKey)
{
RSAPrivateKey k = (RSAPrivateKey)key;
return k.getModulus().bitLength();
}
else if (key instanceof RSAPublicKey)
{
RSAPublicKey k = (RSAPublicKey)key;
return k.getModulus().bitLength();
}
throw new IllegalArgumentException("not an RSA key!");
}
protected int engineGetOutputSize(
int inputLen)
{
try
{
return cipher.getOutputBlockSize();
}
catch (NullPointerException e)
{
throw new IllegalStateException("RSA Cipher not initialised");
}
}
protected AlgorithmParameters engineGetParameters()
{
if (engineParams == null)
{
if (paramSpec != null)
{
try
{
engineParams = helper.createAlgorithmParameters("OAEP");
engineParams.init(paramSpec);
}
catch (Exception e)
{
throw new RuntimeException(e.toString());
}
}
}
return engineParams;
}
protected void engineSetMode(
String mode)
throws NoSuchAlgorithmException
{
String md = Strings.toUpperCase(mode);
if (md.equals("NONE") || md.equals("ECB"))
{
return;
}
if (md.equals("1"))
{
privateKeyOnly = true;
publicKeyOnly = false;
return;
}
else if (md.equals("2"))
{
privateKeyOnly = false;
publicKeyOnly = true;
return;
}
throw new NoSuchAlgorithmException("can't support mode " + mode);
}
protected void engineSetPadding(
String padding)
throws NoSuchPaddingException
{
String pad = Strings.toUpperCase(padding);
if (pad.equals("NOPADDING"))
{
cipher = new RSABlindedEngine();
}
else if (pad.equals("PKCS1PADDING"))
{
cipher = new PKCS1Encoding(new RSABlindedEngine());
}
else if (pad.equals("ISO9796-1PADDING"))
{
cipher = new ISO9796d1Encoding(new RSABlindedEngine());
}
else if (pad.equals("OAEPPADDING"))
{
cipher = new OAEPEncoding(new RSABlindedEngine());
}
else if (pad.equals("OAEPWITHSHA1ANDMGF1PADDING"))
{
cipher = new OAEPEncoding(new RSABlindedEngine());
}
else if (pad.equals("OAEPWITHSHA224ANDMGF1PADDING"))
{
cipher = new OAEPEncoding(new RSABlindedEngine(), new SHA224Digest());
}
else if (pad.equals("OAEPWITHSHA256ANDMGF1PADDING"))
{
cipher = new OAEPEncoding(new RSABlindedEngine(), new SHA256Digest());
}
else if (pad.equals("OAEPWITHSHA384ANDMGF1PADDING"))
{
cipher = new OAEPEncoding(new RSABlindedEngine(), new SHA384Digest());
}
else if (pad.equals("OAEPWITHSHA512ANDMGF1PADDING"))
{
cipher = new OAEPEncoding(new RSABlindedEngine(), new SHA512Digest());
}
else if (pad.equals("OAEPWITHMD5ANDMGF1PADDING"))
{
cipher = new OAEPEncoding(new RSABlindedEngine(), new MD5Digest());
}
else
{
throw new NoSuchPaddingException(padding + " unavailable with RSA.");
}
}
protected void engineInit(
int opmode,
Key key,
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
CipherParameters param;
if (params == null)
{
if (key instanceof RSAPublicKey)
{
if (privateKeyOnly && opmode == Cipher.ENCRYPT_MODE)
{
throw new InvalidKeyException(
"mode 1 requires RSAPrivateKey");
}
param = RSAUtil.generatePublicKeyParameter((RSAPublicKey)key);
}
else if (key instanceof RSAPrivateKey)
{
if (publicKeyOnly && opmode == Cipher.ENCRYPT_MODE)
{
throw new InvalidKeyException(
"mode 2 requires RSAPublicKey");
}
param = RSAUtil.generatePrivateKeyParameter((RSAPrivateKey)key);
}
else
{
throw new InvalidKeyException("unknown key type passed to RSA");
}
}
else
{
throw new IllegalArgumentException("unknown parameter type.");
}
if (!(cipher instanceof RSABlindedEngine))
{
if (random != null)
{
param = new ParametersWithRandom(param, random);
}
else
{
param = new ParametersWithRandom(param, CryptoServicesRegistrar.getSecureRandom());
}
}
switch (opmode)
{
case javax.crypto.Cipher.ENCRYPT_MODE:
case javax.crypto.Cipher.WRAP_MODE:
cipher.init(true, param);
break;
case javax.crypto.Cipher.DECRYPT_MODE:
case javax.crypto.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)
{
throw new InvalidAlgorithmParameterException("cannot recognise parameters.");
}
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 InvalidKeyException("Eeeek! " + e.toString());
}
}
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");
}
}
return getOutput();
}
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 = getOutput();
for (int i = 0; i != out.length; i++)
{
output[outputOffset + i] = out[i];
}
return out.length;
}
private byte[] getOutput()
throws BadPaddingException
{
try
{
byte[] bytes = bOut.toByteArray();
return cipher.processBlock(bytes, 0, bytes.length);
}
catch (final InvalidCipherTextException e)
{
throw new BadPaddingException("unable to decrypt block")
{
public synchronized Throwable getCause()
{
return e;
}
};
}
finally
{
bOut.reset();
}
}
/**
* classes that inherit from us.
*/
static public class NoPadding
extends CipherSpi
{
public NoPadding()
{
super(new RSABlindedEngine());
}
}
static public class PKCS1v1_5Padding
extends CipherSpi
{
public PKCS1v1_5Padding()
{
super(new PKCS1Encoding(new RSABlindedEngine()));
}
}
static public class PKCS1v1_5Padding_PrivateOnly
extends CipherSpi
{
public PKCS1v1_5Padding_PrivateOnly()
{
super(false, true, new PKCS1Encoding(new RSABlindedEngine()));
}
}
static public class PKCS1v1_5Padding_PublicOnly
extends CipherSpi
{
public PKCS1v1_5Padding_PublicOnly()
{
super(true, false, new PKCS1Encoding(new RSABlindedEngine()));
}
}
static public class OAEPPadding
extends CipherSpi
{
public OAEPPadding()
{
super(new OAEPEncoding(new RSABlindedEngine()));
}
}
static public class ISO9796d1Padding
extends CipherSpi
{
public ISO9796d1Padding()
{
super(new ISO9796d1Encoding(new RSABlindedEngine()));
}
}
}
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