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package org.bouncycastle.cert.cmp;
import java.io.IOException;
import java.io.OutputStream;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.cmp.CMPCertificate;
import org.bouncycastle.asn1.cmp.CMPObjectIdentifiers;
import org.bouncycastle.asn1.cmp.PBMParameter;
import org.bouncycastle.asn1.cmp.PKIBody;
import org.bouncycastle.asn1.cmp.PKIHeader;
import org.bouncycastle.asn1.cmp.PKIMessage;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.crmf.PKMACBuilder;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.operator.ContentVerifierProvider;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.util.Arrays;
/**
* Wrapper for a PKIMessage with protection attached to it.
*/
public class ProtectedPKIMessage
{
private PKIMessage pkiMessage;
/**
* Base constructor.
*
* @param pkiMessage a GeneralPKIMessage with
*/
public ProtectedPKIMessage(GeneralPKIMessage pkiMessage)
{
if (!pkiMessage.hasProtection())
{
throw new IllegalArgumentException("PKIMessage not protected");
}
this.pkiMessage = pkiMessage.toASN1Structure();
}
ProtectedPKIMessage(PKIMessage pkiMessage)
{
if (pkiMessage.getHeader().getProtectionAlg() == null)
{
throw new IllegalArgumentException("PKIMessage not protected");
}
this.pkiMessage = pkiMessage;
}
/**
* Return the message header.
*
* @return the message's PKIHeader structure.
*/
public PKIHeader getHeader()
{
return pkiMessage.getHeader();
}
/**
* Return the message body.
*
* @return the message's PKIBody structure.
*/
public PKIBody getBody()
{
return pkiMessage.getBody();
}
/**
* Return the underlying ASN.1 structure contained in this object.
*
* @return a PKIMessage structure.
*/
public PKIMessage toASN1Structure()
{
return pkiMessage;
}
/**
* Determine whether the message is protected by a password based MAC. Use verify(PKMACBuilder, char[])
* to verify the message if this method returns true.
*
* @return true if protection MAC PBE based, false otherwise.
*/
public boolean hasPasswordBasedMacProtection()
{
return pkiMessage.getHeader().getProtectionAlg().getAlgorithm().equals(CMPObjectIdentifiers.passwordBasedMac);
}
/**
* Return the extra certificates associated with this message.
*
* @return an array of extra certificates, zero length if none present.
*/
public X509CertificateHolder[] getCertificates()
{
CMPCertificate[] certs = pkiMessage.getExtraCerts();
if (certs == null)
{
return new X509CertificateHolder[0];
}
X509CertificateHolder[] res = new X509CertificateHolder[certs.length];
for (int i = 0; i != certs.length; i++)
{
res[i] = new X509CertificateHolder(certs[i].getX509v3PKCert());
}
return res;
}
/**
* Verify a message with a public key based signature attached.
*
* @param verifierProvider a provider of signature verifiers.
* @return true if the provider is able to create a verifier that validates
* the signature, false otherwise.
* @throws CMPException if an exception is thrown trying to verify the signature.
*/
public boolean verify(ContentVerifierProvider verifierProvider)
throws CMPException
{
ContentVerifier verifier;
try
{
verifier = verifierProvider.get(pkiMessage.getHeader().getProtectionAlg());
return verifySignature(pkiMessage.getProtection().getBytes(), verifier);
}
catch (Exception e)
{
throw new CMPException("unable to verify signature: " + e.getMessage(), e);
}
}
/**
* Verify a message with password based MAC protection.
*
* @param pkMacBuilder MAC builder that can be used to construct the appropriate MacCalculator
* @param password the MAC password
* @return true if the passed in password and MAC builder verify the message, false otherwise.
* @throws CMPException if algorithm not MAC based, or an exception is thrown verifying the MAC.
*/
public boolean verify(PKMACBuilder pkMacBuilder, char[] password)
throws CMPException
{
if (!CMPObjectIdentifiers.passwordBasedMac.equals(pkiMessage.getHeader().getProtectionAlg().getAlgorithm()))
{
throw new CMPException("protection algorithm not mac based");
}
try
{
pkMacBuilder.setParameters(PBMParameter.getInstance(pkiMessage.getHeader().getProtectionAlg().getParameters()));
MacCalculator calculator = pkMacBuilder.build(password);
OutputStream macOut = calculator.getOutputStream();
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(pkiMessage.getHeader());
v.add(pkiMessage.getBody());
macOut.write(new DERSequence(v).getEncoded(ASN1Encoding.DER));
macOut.close();
return Arrays.areEqual(calculator.getMac(), pkiMessage.getProtection().getBytes());
}
catch (Exception e)
{
throw new CMPException("unable to verify MAC: " + e.getMessage(), e);
}
}
private boolean verifySignature(byte[] signature, ContentVerifier verifier)
throws IOException
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(pkiMessage.getHeader());
v.add(pkiMessage.getBody());
OutputStream sOut = verifier.getOutputStream();
sOut.write(new DERSequence(v).getEncoded(ASN1Encoding.DER));
sOut.close();
return verifier.verify(signature);
}
}
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