org.bouncycastle.jcajce.provider.symmetric.GcmSpecUtil Maven / Gradle / Ivy
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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 with debug enabled.
package org.bouncycastle.jcajce.provider.symmetric;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.cms.GCMParameters;
import org.bouncycastle.jcajce.provider.symmetric.util.ClassUtil;
import org.bouncycastle.util.Integers;
class GcmSpecUtil
{
static final Class gcmSpecClass = ClassUtil.loadClass(GcmSpecUtil.class, "javax.crypto.spec.GCMParameterSpec");
static boolean gcmSpecExists()
{
return gcmSpecClass != null;
}
static boolean isGcmSpec(AlgorithmParameterSpec paramSpec)
{
return gcmSpecClass != null && gcmSpecClass.isInstance(paramSpec);
}
static boolean isGcmSpec(Class paramSpecClass)
{
return gcmSpecClass == paramSpecClass;
}
static AlgorithmParameterSpec extractGcmSpec(ASN1Primitive spec)
throws InvalidParameterSpecException
{
try
{
GCMParameters gcmParams = GCMParameters.getInstance(spec);
Constructor constructor = gcmSpecClass.getConstructor(new Class[]{Integer.TYPE, byte[].class});
return (AlgorithmParameterSpec)constructor.newInstance(new Object[] { Integers.valueOf(gcmParams.getIcvLen() * 8), gcmParams.getNonce() });
}
catch (NoSuchMethodException e)
{
throw new InvalidParameterSpecException("No constructor found!"); // should never happen
}
catch (Exception e)
{
throw new InvalidParameterSpecException("Construction failed: " + e.getMessage()); // should never happen
}
}
static GCMParameters extractGcmParameters(AlgorithmParameterSpec paramSpec)
throws InvalidParameterSpecException
{
try
{
Method tLen = gcmSpecClass.getDeclaredMethod("getTLen", new Class[0]);
Method iv= gcmSpecClass.getDeclaredMethod("getIV", new Class[0]);
return new GCMParameters((byte[])iv.invoke(paramSpec, new Object[0]), ((Integer)tLen.invoke(paramSpec, new Object[0])).intValue() / 8);
}
catch (Exception e)
{
throw new InvalidParameterSpecException("Cannot process GCMParameterSpec");
}
}
}
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