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package org.spongycastle.jce.provider;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.Permission;
import org.spongycastle.jcajce.provider.config.ConfigurableProvider;
import org.spongycastle.jcajce.provider.config.ProviderConfigurationPermission;
import org.spongycastle.jce.spec.ECParameterSpec;
public class ProviderUtil
{
private static Permission BC_EC_LOCAL_PERMISSION = new ProviderConfigurationPermission(
"SC", ConfigurableProvider.THREAD_LOCAL_EC_IMPLICITLY_CA);
private static Permission BC_EC_PERMISSION = new ProviderConfigurationPermission(
"SC", ConfigurableProvider.EC_IMPLICITLY_CA);
private static ThreadLocal threadSpec = new ThreadLocal();
private static volatile ECParameterSpec ecImplicitCaParams;
static void setParameter(String parameterName, Object parameter)
{
SecurityManager securityManager = System.getSecurityManager();
if (parameterName.equals(ConfigurableProvider.THREAD_LOCAL_EC_IMPLICITLY_CA))
{
ECParameterSpec curveSpec;
if (securityManager != null)
{
securityManager.checkPermission(BC_EC_LOCAL_PERMISSION);
}
curveSpec = (ECParameterSpec)parameter;
threadSpec.set(curveSpec);
}
else if (parameterName.equals(ConfigurableProvider.EC_IMPLICITLY_CA))
{
if (securityManager != null)
{
securityManager.checkPermission(BC_EC_PERMISSION);
}
ecImplicitCaParams = (ECParameterSpec)parameter;
}
}
public static ECParameterSpec getEcImplicitlyCa()
{
ECParameterSpec spec = (ECParameterSpec)threadSpec.get();
if (spec != null)
{
return spec;
}
return ecImplicitCaParams;
}
static int getReadLimit(InputStream in)
throws IOException
{
if (in instanceof ByteArrayInputStream)
{
return in.available();
}
return Integer.MAX_VALUE;
}
}
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