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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 to JDK 1.8.
package org.bouncycastle.jcajce.provider.symmetric.util;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import javax.crypto.MacSpi;
import javax.crypto.SecretKey;
import javax.crypto.interfaces.PBEKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.crypto.spec.RC2ParameterSpec;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Mac;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.AEADParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.crypto.params.RC2Parameters;
import org.bouncycastle.crypto.params.SkeinParameters;
import org.bouncycastle.jcajce.PKCS12Key;
import org.bouncycastle.jcajce.spec.AEADParameterSpec;
import org.bouncycastle.jcajce.spec.SkeinParameterSpec;
public class BaseMac
extends MacSpi implements PBE
{
private static final Class gcmSpecClass = ClassUtil.loadClass(BaseMac.class, "javax.crypto.spec.GCMParameterSpec");
private Mac macEngine;
private int scheme = PKCS12;
private int pbeHash = SHA1;
private int keySize = 160;
protected BaseMac(
Mac macEngine)
{
this.macEngine = macEngine;
}
protected BaseMac(
Mac macEngine,
int scheme,
int pbeHash,
int keySize)
{
this.macEngine = macEngine;
this.scheme = scheme;
this.pbeHash = pbeHash;
this.keySize = keySize;
}
protected void engineInit(
Key key,
final AlgorithmParameterSpec params)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
CipherParameters param;
if (key == null)
{
throw new InvalidKeyException("key is null");
}
if (key instanceof PKCS12Key)
{
SecretKey k;
PBEParameterSpec pbeSpec;
try
{
k = (SecretKey)key;
}
catch (Exception e)
{
throw new InvalidKeyException("PKCS12 requires a SecretKey/PBEKey");
}
try
{
pbeSpec = (PBEParameterSpec)params;
}
catch (Exception e)
{
throw new InvalidAlgorithmParameterException("PKCS12 requires a PBEParameterSpec");
}
if (k instanceof PBEKey && pbeSpec == null)
{
pbeSpec = new PBEParameterSpec(((PBEKey)k).getSalt(), ((PBEKey)k).getIterationCount());
}
int digest = SHA1;
int keySize = 160;
if (macEngine.getAlgorithmName().startsWith("GOST"))
{
digest = GOST3411;
keySize = 256;
}
else if (macEngine instanceof HMac)
{
if (!macEngine.getAlgorithmName().startsWith("SHA-1"))
{
if (macEngine.getAlgorithmName().startsWith("SHA-224"))
{
digest = SHA224;
keySize = 224;
}
else if (macEngine.getAlgorithmName().startsWith("SHA-256"))
{
digest = SHA256;
keySize = 256;
}
else if (macEngine.getAlgorithmName().startsWith("SHA-384"))
{
digest = SHA384;
keySize = 384;
}
else if (macEngine.getAlgorithmName().startsWith("SHA-512"))
{
digest = SHA512;
keySize = 512;
}
else if (macEngine.getAlgorithmName().startsWith("RIPEMD160"))
{
digest = RIPEMD160;
keySize = 160;
}
else
{
throw new InvalidAlgorithmParameterException("no PKCS12 mapping for HMAC: " + macEngine.getAlgorithmName());
}
}
}
// TODO: add correct handling for other digests
param = PBE.Util.makePBEMacParameters(k, PKCS12, digest, keySize, pbeSpec);
}
else if (key instanceof BCPBEKey)
{
BCPBEKey k = (BCPBEKey)key;
if (k.getParam() != null)
{
param = k.getParam();
}
else if (params instanceof PBEParameterSpec)
{
param = PBE.Util.makePBEMacParameters(k, params);
}
else
{
throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
}
}
else
{
if (params instanceof PBEParameterSpec)
{
throw new InvalidAlgorithmParameterException("inappropriate parameter type: " + params.getClass().getName());
}
param = new KeyParameter(key.getEncoded());
}
final KeyParameter keyParam;
if (param instanceof ParametersWithIV)
{
keyParam = (KeyParameter)((ParametersWithIV)param).getParameters();
}
else
{
keyParam = (KeyParameter)param;
}
if (params instanceof AEADParameterSpec)
{
AEADParameterSpec aeadSpec = (AEADParameterSpec)params;
param = new AEADParameters(keyParam, aeadSpec.getMacSizeInBits(), aeadSpec.getNonce(), aeadSpec.getAssociatedData());
}
else if (params instanceof IvParameterSpec)
{
param = new ParametersWithIV(keyParam, ((IvParameterSpec)params).getIV());
}
else if (params instanceof RC2ParameterSpec)
{
param = new ParametersWithIV(new RC2Parameters(keyParam.getKey(), ((RC2ParameterSpec)params).getEffectiveKeyBits()), ((RC2ParameterSpec)params).getIV());
}
else if (params instanceof SkeinParameterSpec)
{
param = new SkeinParameters.Builder(copyMap(((SkeinParameterSpec)params).getParameters())).setKey(keyParam.getKey()).build();
}
else if (params == null)
{
param = new KeyParameter(key.getEncoded());
}
else if (gcmSpecClass != null && gcmSpecClass.isAssignableFrom(params.getClass()))
{
param = GcmSpecUtil.extractAeadParameters(keyParam, params);
}
else if (!(params instanceof PBEParameterSpec))
{
throw new InvalidAlgorithmParameterException("unknown parameter type: " + params.getClass().getName());
}
try
{
macEngine.init(param);
}
catch (Exception e)
{
throw new InvalidAlgorithmParameterException("cannot initialize MAC: " + e.getMessage());
}
}
protected int engineGetMacLength()
{
return macEngine.getMacSize();
}
protected void engineReset()
{
macEngine.reset();
}
protected void engineUpdate(
byte input)
{
macEngine.update(input);
}
protected void engineUpdate(
byte[] input,
int offset,
int len)
{
macEngine.update(input, offset, len);
}
protected byte[] engineDoFinal()
{
byte[] out = new byte[engineGetMacLength()];
macEngine.doFinal(out, 0);
return out;
}
private static Hashtable copyMap(Map paramsMap)
{
Hashtable newTable = new Hashtable();
Iterator keys = paramsMap.keySet().iterator();
while (keys.hasNext())
{
Object key = keys.next();
newTable.put(key, paramsMap.get(key));
}
return newTable;
}
}