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using System;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cmp;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crmf;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.X509;
namespace Org.BouncyCastle.Cmp
{
/// <summary>
/// Wrapper for a PKIMessage with protection attached to it.
/// </summary>
public class ProtectedPkiMessage
{
private readonly PkiMessage m_pkiMessage;
/// <summary>
/// Wrap a general message.
/// </summary>
/// <exception cref="ArgumentException">If the general message does not have protection.</exception>
/// <param name="pkiMessage">The General message</param>
public ProtectedPkiMessage(GeneralPkiMessage pkiMessage)
{
if (!pkiMessage.HasProtection)
throw new ArgumentException("GeneralPkiMessage not protected");
this.m_pkiMessage = pkiMessage.ToAsn1Structure();
}
// TODO[cmp] Make internal? (Has test that uses it)
/// <summary>
/// Wrap a PKI message.
/// </summary>
/// <exception cref="ArgumentException">If the PKI message does not have protection.</exception>
/// <param name="pkiMessage">The PKI message</param>
public ProtectedPkiMessage(PkiMessage pkiMessage)
{
if (null == pkiMessage.Header.ProtectionAlg)
throw new ArgumentException("PkiMessage not protected");
this.m_pkiMessage = pkiMessage;
}
/// <summary>Message header</summary>
public virtual PkiHeader Header => m_pkiMessage.Header;
/// <summary>Message body</summary>
public virtual PkiBody Body => m_pkiMessage.Body;
/// <summary>
/// Return the underlying ASN.1 structure contained in this object.
/// </summary>
/// <returns>PkiMessage structure</returns>
public virtual PkiMessage ToAsn1Message() => m_pkiMessage;
/// <summary>
/// Determine whether the message is protected by a password based MAC. Use verify(PKMACBuilder, char[])
/// to verify the message if this method returns true.
/// </summary>
/// <returns>true if protection MAC PBE based, false otherwise.</returns>
public virtual bool HasPasswordBasedMacProtected
{
get { return CmpObjectIdentifiers.passwordBasedMac.Equals(Header.ProtectionAlg.Algorithm); }
}
/// <summary>
/// Return the extra certificates associated with this message.
/// </summary>
/// <returns>an array of extra certificates, zero length if none present.</returns>
public virtual X509Certificate[] GetCertificates()
{
CmpCertificate[] certs = m_pkiMessage.GetExtraCerts();
if (null == certs)
return new X509Certificate[0];
X509Certificate[] result = new X509Certificate[certs.Length];
for (int t = 0; t < certs.Length; t++)
{
result[t] = new X509Certificate(certs[t].X509v3PKCert);
}
return result;
}
/// <summary>
/// Verify a message with a public key based signature attached.
/// </summary>
/// <param name="verifierFactory">a factory of signature verifiers.</param>
/// <returns>true if the provider is able to create a verifier that validates the signature, false otherwise.</returns>
public virtual bool Verify(IVerifierFactory verifierFactory)
{
IStreamCalculator<IVerifier> streamCalculator = verifierFactory.CreateCalculator();
IVerifier result = Process(streamCalculator);
return result.IsVerified(m_pkiMessage.Protection.GetBytes());
}
/// <summary>
/// Verify a message with password based MAC protection.
/// </summary>
/// <param name="pkMacBuilder">MAC builder that can be used to construct the appropriate MacCalculator</param>
/// <param name="password">the MAC password</param>
/// <returns>true if the passed in password and MAC builder verify the message, false otherwise.</returns>
/// <exception cref="InvalidOperationException">if algorithm not MAC based, or an exception is thrown verifying the MAC.</exception>
public virtual bool Verify(PKMacBuilder pkMacBuilder, char[] password)
{
if (!CmpObjectIdentifiers.passwordBasedMac.Equals(m_pkiMessage.Header.ProtectionAlg.Algorithm))
throw new InvalidOperationException("protection algorithm is not mac based");
PbmParameter parameter = PbmParameter.GetInstance(m_pkiMessage.Header.ProtectionAlg.Parameters);
pkMacBuilder.SetParameters(parameter);
IBlockResult result = Process(pkMacBuilder.Build(password).CreateCalculator());
return Arrays.ConstantTimeAreEqual(result.Collect(), m_pkiMessage.Protection.GetBytes());
}
private TResult Process<TResult>(IStreamCalculator<TResult> streamCalculator)
{
Asn1EncodableVector avec = new Asn1EncodableVector();
avec.Add(m_pkiMessage.Header);
avec.Add(m_pkiMessage.Body);
byte[] enc = new DerSequence(avec).GetDerEncoded();
streamCalculator.Stream.Write(enc, 0, enc.Length);
streamCalculator.Stream.Flush();
Platform.Dispose(streamCalculator.Stream);
return streamCalculator.GetResult();
}
}
}
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