Verify() public method

Verifies the packet given a RSA key and a Hash algorithm.
public Verify ( RSACryptoServiceProvider rsa, HashAlgorithm hash ) : bool
rsa System.Security.Cryptography.RSACryptoServiceProvider
hash System.Security.Cryptography.HashAlgorithm
return bool
コード例 #1
0
        /// <summary>3b) Receive a Confirm, verify the entire stack and send a Confirm
        /// 4a)Receive a Confirm, verify the entire stack and all set to go</summary>
        /// <param name="sa">A security association that we wish to perform the
        /// specified control operation on.</param>
        /// <param name="scm">The received SecurityControlMessage.</param>
        /// <param name="scm_reply">A prepared reply message (with headers and such.</param>
        /// <param name="return_path">Where to send the result.</param>
        /// <param name="low_level_sender">We expect the return_path to not be an edge or
        /// some other type of "low level" sender, so this contains the parsed out value.</param>
        protected void HandleControlConfirm(PeerSecAssociation sa,
                                            SecurityControlMessage scm, SecurityControlMessage scm_reply,
                                            ISender return_path, ISender low_level_sender)
        {
            ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received Confirm from: " + low_level_sender);
            if (sa == null)
            {
                throw new Exception("No valid SA!");
            }
            HashAlgorithm sha1 = new SHA1CryptoServiceProvider();

            scm.Verify((RSACryptoServiceProvider)sa.RemoteCertificate.RSA, sha1);

            if (return_path == low_level_sender)
            {
                sa.VerifyResponse(scm.Hash);
            }
            else
            {
                sa.VerifyRequest(scm.Hash);
                scm_reply.LocalCookie  = scm.RemoteCookie;
                scm_reply.RemoteCookie = scm.LocalCookie;
                scm_reply.Hash         = sa.DHEWithCertificateAndCAsInHash.Value;
                scm_reply.Type         = SecurityControlMessage.MessageType.Confirm;
                lock (_private_key_lock) {
                    scm_reply.Sign(_private_key, sha1);
                }
                ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);
                return_path.Send(to_send);
            }
            sa.Enable();

            ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful Confirm from: " + low_level_sender);
        }
コード例 #2
0
        /// <summary>3a) Receive a DHEWithCertificate, verify the certificate and DHE and
        /// send a Confirm that you are ready to Verify the stack and start the
        /// system.</summary>
        /// <param name="sa">A security association that we wish to perform the
        /// specified control operation on.</param>
        /// <param name="scm">The received SecurityControlMessage.</param>
        /// <param name="scm_reply">A prepared reply message (with headers and such.</param>
        /// <param name="return_path">Where to send the result.</param>
        /// <param name="low_level_sender">We expect the return_path to not be an edge or
        /// some other type of "low level" sender, so this contains the parsed out value.</param>
        protected void HandleControlDHEWithCertificates(PeerSecAssociation sa,
                                                        SecurityControlMessage scm, SecurityControlMessage scm_reply,
                                                        ISender return_path, ISender low_level_sender)
        {
            ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received DHEWithCertificate from: " + low_level_sender);
            if (sa == null)
            {
                throw new Exception("No valid SA!");
            }
            byte[] cert = new byte[scm.Certificate.Length];
            scm.Certificate.CopyTo(cert, 0);
            X509Certificate rcert = new X509Certificate(cert);
            HashAlgorithm   sha1  = new SHA1CryptoServiceProvider();

            scm.Verify((RSACryptoServiceProvider)rcert.RSA, sha1);
            _ch.Verify(rcert, low_level_sender);

            sa.RemoteCertificate = rcert;
            sa.RDHE.Value        = scm.DHE;

            scm_reply.LocalCookie  = scm.RemoteCookie;
            scm_reply.RemoteCookie = scm.LocalCookie;
            scm_reply.Hash         = MemBlock.Reference(sha1.ComputeHash((byte[])scm.Packet));
            scm_reply.Type         = SecurityControlMessage.MessageType.Confirm;
            lock (_private_key_lock) {
                scm_reply.Sign(_private_key, sha1);
            }

            ICopyable to_send = new CopyList(Security, SecureControl, scm_reply.Packet);

            _rrman.SendRequest(return_path, ReqrepManager.ReqrepType.Request,
                               to_send, this, sa);
            ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful DHEWithCertificate from: " + low_level_sender);
        }
コード例 #3
0
        /// <summary>2b) Receive a DHEWithCertificateAndCAs, verify the certificate and attempt
        /// to find a matching Certificate for the list of CAs, if you find one,
        /// finish the DHE handshake and send the certificate via a DHEWithCertificate</summary>
        /// <param name="sa">A security association that we wish to perform the
        /// specified control operation on.</param>
        /// <param name="scm">The received SecurityControlMessage.</param>
        /// <param name="scm_reply">A prepared reply message (with headers and such.</param>
        /// <param name="return_path">Where to send the result.</param>
        /// <param name="low_level_sender">We expect the return_path to not be an edge or
        /// some other type of "low level" sender, so this contains the parsed out value.</param>
        protected void HandleControlDHEWithCertificateAndCAs(PeerSecAssociation sa,
                                                             SecurityControlMessage scm, SecurityControlMessage scm_reply,
                                                             ISender return_path, ISender low_level_sender)
        {
            ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received DHEWithCertificateAndCAs from: " + low_level_sender);
            if (sa == null)
            {
                sa = CreateSecurityAssociation(low_level_sender, scm.SPI, false);
            }
            byte[] cert = new byte[scm.Certificate.Length];
            scm.Certificate.CopyTo(cert, 0);
            X509Certificate rcert = new X509Certificate(cert);

            _ch.Verify(rcert, low_level_sender);
            HashAlgorithm sha1 = new SHA1CryptoServiceProvider();

            scm.Verify((RSACryptoServiceProvider)rcert.RSA, sha1);

            X509Certificate lcert = null;

            if (SecurityPolicy.GetPolicy(scm.SPI).PreExchangedKeys)
            {
                lcert = _ch.DefaultCertificate;
            }
            else
            {
                lcert = _ch.FindCertificate(scm.CAs);
            }

            sa.LocalCertificate  = lcert;
            sa.RemoteCertificate = rcert;
            sa.RDHE.Value        = scm.DHE;
            sa.DHEWithCertificateAndCAsInHash.Value = MemBlock.Reference(sha1.ComputeHash((byte[])scm.Packet));

            scm_reply.LocalCookie  = scm.RemoteCookie;
            scm_reply.RemoteCookie = scm.LocalCookie;
            scm_reply.DHE          = sa.LDHE;
            scm_reply.Certificate  = MemBlock.Reference(lcert.RawData);
            scm_reply.Type         = SecurityControlMessage.MessageType.DHEWithCertificate;
            lock (_private_key_lock) {
                scm_reply.Sign(_private_key, sha1);
            }
            sa.DHEWithCertificateHash.Value = MemBlock.Reference(sha1.ComputeHash((byte[])scm_reply.Packet));

            ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);

            return_path.Send(to_send);
            ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful DHEWithCertificateAndCAs from: " + low_level_sender);
        }
コード例 #4
0
    public void Incoming() {
      Random rand = new Random();
      byte[] local_cookie = new byte[SecurityControlMessage.CookieLength];
      byte[] remote_cookie = new byte[SecurityControlMessage.CookieLength];
      byte[] dhe = new byte[144];
      byte[] cas = new byte[120];
      byte[] cert = new byte[100];
      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
      HashAlgorithm hash = new SHA1CryptoServiceProvider();

      rand.NextBytes(local_cookie);
      rand.NextBytes(remote_cookie);
      rand.NextBytes(dhe);
      rand.NextBytes(cas);
      rand.NextBytes(cert);

      MemBlock mlocal_cookie = MemBlock.Reference(local_cookie);
      MemBlock mremote_cookie = MemBlock.Reference(remote_cookie);
      MemBlock mdhe = MemBlock.Reference(dhe);
      MemBlock mcert = MemBlock.Reference(cert);
      MemBlock mcas = MemBlock.Reference(cas);
      List<MemBlock> lcas = new List<MemBlock>();
      for(int i = 0; i < cas.Length; i+= SecurityControlMessage.CALength) {
        lcas.Add(MemBlock.Reference(mcas.Slice(i, SecurityControlMessage.CALength)));
      }

      int length = 4 + 4 + 4 + 2 * SecurityControlMessage.CookieLength +
        4 + cas.Length + 4 + dhe.Length +
        4 + cert.Length;

      byte[] b = new byte[length];
      int pos = 0;
      NumberSerializer.WriteInt(5, b, pos);
      pos += 4;
      NumberSerializer.WriteInt(12345, b, pos);
      pos += 4;
      NumberSerializer.WriteInt((int) SecurityControlMessage.MessageType.DHEWithCertificateAndCAs, b, pos);
      pos += 4;
      local_cookie.CopyTo(b, pos);
      pos += SecurityControlMessage.CookieLength;
      remote_cookie.CopyTo(b, pos);
      pos += SecurityControlMessage.CookieLength;

      NumberSerializer.WriteInt(dhe.Length, b, pos);
      pos += 4;
      dhe.CopyTo(b, pos);
      pos += dhe.Length;

      NumberSerializer.WriteInt(cert.Length, b, pos);
      pos += 4;
      cert.CopyTo(b, pos);
      pos += cert.Length;

      NumberSerializer.WriteInt(cas.Length, b, pos);
      pos += 4;
      mcas.CopyTo(b, pos);
      pos += cas.Length;

      byte[] signature = rsa.SignData(b, hash);
      byte[] nb = new byte[b.Length + signature.Length];
      b.CopyTo(nb, 0);
      signature.CopyTo(nb, b.Length);
      MemBlock packet = MemBlock.Reference(nb);

      // check 
      SecurityControlMessage scm = new SecurityControlMessage(packet);
      Assert.AreEqual(5, scm.Version, "Version");
      Assert.AreEqual(12345, scm.SPI, "SPI");
      Assert.AreEqual(SecurityControlMessage.MessageType.DHEWithCertificateAndCAs, scm.Type, "Type");
      Assert.AreEqual(mlocal_cookie, scm.LocalCookie, "LocalCookie");
      Assert.AreEqual(mremote_cookie, scm.RemoteCookie, "RemoteCookie");
      Assert.AreEqual(mdhe, scm.DHE, "DHE");
      Assert.AreEqual(mcert, scm.Certificate, "Certificate");
      int contains = 0;
      foreach(MemBlock ca in scm.CAs) {
        if(scm.CAs.Contains(ca)) {
          contains++;
        }
      }
      Assert.AreEqual(contains, lcas.Count, "Contains CAs");
      Assert.IsTrue(scm.Verify(rsa, hash), "Signature");
      Assert.AreEqual(packet, scm.Packet, "Packet");

      // change a few things around and check again!
      scm.Version = 0;
      SecurityControlMessage scm1 = new SecurityControlMessage(scm.Packet);
      scm1.Sign(rsa, hash);
      Assert.AreEqual(scm1.Version, scm.Version, "Version 1");
      Assert.AreEqual(scm1.SPI, scm.SPI, "SPI 1");
      Assert.AreEqual(scm1.Type, scm.Type, "Type 1");
      Assert.AreEqual(scm1.LocalCookie, scm.LocalCookie, "LocalCookie 1");
      Assert.AreEqual(scm1.RemoteCookie, scm.RemoteCookie, "RemoteCookie 1");
      Assert.AreEqual(mdhe, scm.DHE, "DHE 1");
      Assert.AreEqual(mcert, scm.Certificate, "Certificate 1");
      contains = 0;
      foreach(MemBlock ca in scm.CAs) {
        if(scm.CAs.Contains(ca)) {
          contains++;
        }
      }
      Assert.AreEqual(contains, lcas.Count, "Contains CAs 1");
      Assert.IsTrue(scm1.Signature != scm.Signature, "Signature 1");
      Assert.AreEqual(scm1.Packet.Slice(4, scm1.Signature.Length),
          scm.Packet.Slice(4, scm.Signature.Length), "Packet 1");
    }
コード例 #5
0
ファイル: PeerSecOverlord.cs プロジェクト: pstjuste/brunet
    /// <summary>3b) Receive a Confirm, verify the entire stack and send a Confirm
    /// 4a)Receive a Confirm, verify the entire stack and all set to go</summary>
    /// <param name="sa">A security association that we wish to perform the
    /// specified control operation on.</param>
    /// <param name="scm">The received SecurityControlMessage.</param>
    /// <param name="scm_reply">A prepared reply message (with headers and such.</param>
    /// <param name="return_path">Where to send the result.</param>
    /// <param name="low_level_sender">We expect the return_path to not be an edge or
    /// some other type of "low level" sender, so this contains the parsed out value.</param>
    protected void HandleControlConfirm(PeerSecAssociation sa,
        SecurityControlMessage scm, SecurityControlMessage scm_reply,
        ISender return_path, ISender low_level_sender)
    {
      ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received Confirm from: " + low_level_sender);
      if(sa == null) {
        throw new Exception("No valid SA!");
      }
      HashAlgorithm sha1 = new SHA1CryptoServiceProvider();
      scm.Verify((RSACryptoServiceProvider) sa.RemoteCertificate.RSA, sha1);

      if(return_path == low_level_sender) {
        sa.VerifyResponse(scm.Hash);
      } else {
        sa.VerifyRequest(scm.Hash);
        scm_reply.LocalCookie = scm.RemoteCookie;
        scm_reply.RemoteCookie = scm.LocalCookie;
        scm_reply.Hash = sa.DHEWithCertificateAndCAsInHash.Value;
        scm_reply.Type = SecurityControlMessage.MessageType.Confirm;
        lock(_private_key_lock) {
          scm_reply.Sign(_private_key, sha1);
        }
        ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);
        return_path.Send(to_send);
      }
      sa.Enable();

      ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful Confirm from: " + low_level_sender);
    }
コード例 #6
0
ファイル: PeerSecOverlord.cs プロジェクト: pstjuste/brunet
    /// <summary>3a) Receive a DHEWithCertificate, verify the certificate and DHE and
    /// send a Confirm that you are ready to Verify the stack and start the
    /// system.</summary>
    /// <param name="sa">A security association that we wish to perform the
    /// specified control operation on.</param>
    /// <param name="scm">The received SecurityControlMessage.</param>
    /// <param name="scm_reply">A prepared reply message (with headers and such.</param>
    /// <param name="return_path">Where to send the result.</param>
    /// <param name="low_level_sender">We expect the return_path to not be an edge or
    /// some other type of "low level" sender, so this contains the parsed out value.</param>
    protected void HandleControlDHEWithCertificate(PeerSecAssociation sa,
        SecurityControlMessage scm, SecurityControlMessage scm_reply,
        ISender return_path, ISender low_level_sender)
    {
      ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received DHEWithCertificate from: " + low_level_sender);
      if(sa == null) {
        throw new Exception("No valid SA!");
      }
      byte[] cert = new byte[scm.Certificate.Length];
      scm.Certificate.CopyTo(cert, 0);
      X509Certificate rcert = new X509Certificate(cert);
      HashAlgorithm sha1 = new SHA1CryptoServiceProvider();
      scm.Verify((RSACryptoServiceProvider) rcert.RSA, sha1);
      _ch.Verify(rcert, low_level_sender);

      sa.RemoteCertificate = rcert;
      sa.RDHE.Value = scm.DHE;

      scm_reply.LocalCookie = scm.RemoteCookie;
      scm_reply.RemoteCookie = scm.LocalCookie;
      scm_reply.Hash = MemBlock.Reference(sha1.ComputeHash((byte[]) scm.Packet));
      scm_reply.Type = SecurityControlMessage.MessageType.Confirm;
      lock(_private_key_lock) {
        scm_reply.Sign(_private_key, sha1);
      }

      ICopyable to_send = new CopyList(Security, SecureControl, scm_reply.Packet);
      _rrman.SendRequest(return_path, ReqrepManager.ReqrepType.Request,
          to_send, this, sa);
      ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful DHEWithCertificate from: " + low_level_sender);
    }
コード例 #7
0
ファイル: PeerSecOverlord.cs プロジェクト: pstjuste/brunet
    /// <summary>2b) Receive a DHEWithCertificateAndCAs, verify the certificate and attempt
    /// to find a matching Certificate for the list of CAs, if you find one,
    /// finish the DHE handshake and send the certificate via a DHEWithCertificate</summary>
    /// <param name="sa">A security association that we wish to perform the
    /// specified control operation on.</param>
    /// <param name="scm">The received SecurityControlMessage.</param>
    /// <param name="scm_reply">A prepared reply message (with headers and such.</param>
    /// <param name="return_path">Where to send the result.</param>
    /// <param name="low_level_sender">We expect the return_path to not be an edge or
    /// some other type of "low level" sender, so this contains the parsed out value.</param>
    protected void HandleControlDHEWithCertificateAndCAs(PeerSecAssociation sa,
        SecurityControlMessage scm, SecurityControlMessage scm_reply,
        ISender return_path, ISender low_level_sender)
    {
      ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Received DHEWithCertificateAndCAs from: " + low_level_sender);
      if(sa == null) {
        sa = CreateSecurityAssociation(low_level_sender, scm.SPI, false);
      }
      byte[] cert = new byte[scm.Certificate.Length];
      scm.Certificate.CopyTo(cert, 0);
      X509Certificate rcert = new X509Certificate(cert);
      _ch.Verify(rcert, low_level_sender);
      HashAlgorithm sha1 = new SHA1CryptoServiceProvider();
      scm.Verify((RSACryptoServiceProvider) rcert.RSA, sha1);

      X509Certificate lcert = null;
      if(SecurityPolicy.GetPolicy(scm.SPI).PreExchangedKeys) {
        lcert = _ch.DefaultCertificate;
      } else {
        lcert = _ch.FindCertificate(scm.CAs);
      }

      sa.LocalCertificate = lcert;
      sa.RemoteCertificate = rcert;
      sa.RDHE.Value = scm.DHE;
      sa.DHEWithCertificateAndCAsInHash.Value = MemBlock.Reference(sha1.ComputeHash((byte[]) scm.Packet));

      scm_reply.LocalCookie = scm.RemoteCookie;
      scm_reply.RemoteCookie = scm.LocalCookie;
      scm_reply.DHE = sa.LDHE;
      scm_reply.Certificate = MemBlock.Reference(lcert.RawData);
      scm_reply.Type = SecurityControlMessage.MessageType.DHEWithCertificate;
      lock(_private_key_lock) {
        scm_reply.Sign(_private_key, sha1);
      }
      sa.DHEWithCertificateHash.Value = MemBlock.Reference(sha1.ComputeHash((byte[]) scm_reply.Packet));

      ICopyable to_send = new CopyList(SecureControl, scm_reply.Packet);
      return_path.Send(to_send);
      ProtocolLog.WriteIf(ProtocolLog.Security, GetHashCode() + " Successful DHEWithCertificateAndCAs from: " + low_level_sender);
    }
コード例 #8
0
        public void Incoming()
        {
            Random rand = new Random();

            byte[] local_cookie           = new byte[SecurityControlMessage.CookieLength];
            byte[] remote_cookie          = new byte[SecurityControlMessage.CookieLength];
            byte[] dhe                    = new byte[144];
            byte[] cas                    = new byte[120];
            byte[] cert                   = new byte[100];
            RSACryptoServiceProvider rsa  = new RSACryptoServiceProvider();
            HashAlgorithm            hash = new SHA1CryptoServiceProvider();

            rand.NextBytes(local_cookie);
            rand.NextBytes(remote_cookie);
            rand.NextBytes(dhe);
            rand.NextBytes(cas);
            rand.NextBytes(cert);

            MemBlock        mlocal_cookie  = MemBlock.Reference(local_cookie);
            MemBlock        mremote_cookie = MemBlock.Reference(remote_cookie);
            MemBlock        mdhe           = MemBlock.Reference(dhe);
            MemBlock        mcert          = MemBlock.Reference(cert);
            MemBlock        mcas           = MemBlock.Reference(cas);
            List <MemBlock> lcas           = new List <MemBlock>();

            for (int i = 0; i < cas.Length; i += SecurityControlMessage.CALength)
            {
                lcas.Add(MemBlock.Reference(mcas.Slice(i, SecurityControlMessage.CALength)));
            }

            int length = 4 + 4 + 4 + 2 * SecurityControlMessage.CookieLength +
                         4 + cas.Length + 4 + dhe.Length +
                         4 + cert.Length;

            byte[] b   = new byte[length];
            int    pos = 0;

            NumberSerializer.WriteInt(5, b, pos);
            pos += 4;
            NumberSerializer.WriteInt(12345, b, pos);
            pos += 4;
            NumberSerializer.WriteInt((int)SecurityControlMessage.MessageType.DHEWithCertificateAndCAs, b, pos);
            pos += 4;
            local_cookie.CopyTo(b, pos);
            pos += SecurityControlMessage.CookieLength;
            remote_cookie.CopyTo(b, pos);
            pos += SecurityControlMessage.CookieLength;

            NumberSerializer.WriteInt(dhe.Length, b, pos);
            pos += 4;
            dhe.CopyTo(b, pos);
            pos += dhe.Length;

            NumberSerializer.WriteInt(cert.Length, b, pos);
            pos += 4;
            cert.CopyTo(b, pos);
            pos += cert.Length;

            NumberSerializer.WriteInt(cas.Length, b, pos);
            pos += 4;
            mcas.CopyTo(b, pos);
            pos += cas.Length;

            byte[] signature = rsa.SignData(b, hash);
            byte[] nb        = new byte[b.Length + signature.Length];
            b.CopyTo(nb, 0);
            signature.CopyTo(nb, b.Length);
            MemBlock packet = MemBlock.Reference(nb);

            // check
            SecurityControlMessage scm = new SecurityControlMessage(packet);

            Assert.AreEqual(5, scm.Version, "Version");
            Assert.AreEqual(12345, scm.SPI, "SPI");
            Assert.AreEqual(SecurityControlMessage.MessageType.DHEWithCertificateAndCAs, scm.Type, "Type");
            Assert.AreEqual(mlocal_cookie, scm.LocalCookie, "LocalCookie");
            Assert.AreEqual(mremote_cookie, scm.RemoteCookie, "RemoteCookie");
            Assert.AreEqual(mdhe, scm.DHE, "DHE");
            Assert.AreEqual(mcert, scm.Certificate, "Certificate");
            int contains = 0;

            foreach (MemBlock ca in scm.CAs)
            {
                if (scm.CAs.Contains(ca))
                {
                    contains++;
                }
            }
            Assert.AreEqual(contains, lcas.Count, "Contains CAs");
            Assert.IsTrue(scm.Verify(rsa, hash), "Signature");
            Assert.AreEqual(packet, scm.Packet, "Packet");

            // change a few things around and check again!
            scm.Version = 0;
            SecurityControlMessage scm1 = new SecurityControlMessage(scm.Packet);

            scm1.Sign(rsa, hash);
            Assert.AreEqual(scm1.Version, scm.Version, "Version 1");
            Assert.AreEqual(scm1.SPI, scm.SPI, "SPI 1");
            Assert.AreEqual(scm1.Type, scm.Type, "Type 1");
            Assert.AreEqual(scm1.LocalCookie, scm.LocalCookie, "LocalCookie 1");
            Assert.AreEqual(scm1.RemoteCookie, scm.RemoteCookie, "RemoteCookie 1");
            Assert.AreEqual(mdhe, scm.DHE, "DHE 1");
            Assert.AreEqual(mcert, scm.Certificate, "Certificate 1");
            contains = 0;
            foreach (MemBlock ca in scm.CAs)
            {
                if (scm.CAs.Contains(ca))
                {
                    contains++;
                }
            }
            Assert.AreEqual(contains, lcas.Count, "Contains CAs 1");
            Assert.IsTrue(scm1.Signature != scm.Signature, "Signature 1");
            Assert.AreEqual(scm1.Packet.Slice(4, scm1.Signature.Length),
                            scm.Packet.Slice(4, scm.Signature.Length), "Packet 1");
        }