public static Akep2Message3 FromString(string str, byte[] longTermKey)
{
var contentBytes = PemParser.GetMessageContentBytes(str);
var contentObjectsList = (List <object>)SksAsn1Parser.Parse(contentBytes);
var iv = (byte[])contentObjectsList[0];
var encryptedPart = (byte[])contentObjectsList[1];
var hmacPart = (byte[])contentObjectsList[2];
var myHmac = SksHmac.Hash(longTermKey, encryptedPart);
if (!Utils.CompareByteArrays(hmacPart, myHmac))
{
Logger.Log("AKEP2MESSAGE2:", "Hmac doesn't match");
return(null);
}
var decryptedSequence = SksAes.DecryptBytesFromBytes_Aes(encryptedPart, longTermKey, iv);
contentObjectsList = (List <object>)SksAsn1Parser.Parse(decryptedSequence);
var a = (string)contentObjectsList[0];
var nonceB = (byte[])contentObjectsList[1];
return(new Akep2Message3(a, nonceB, longTermKey));
}
public static Akep2Message1 FromString(string str)
{
var contentBytes = PemParser.GetMessageContentBytes(str);
var contentObjectsList = (List <object>)SksAsn1Parser.Parse(contentBytes);
var nonceA = (byte[])contentObjectsList[0];
return(new Akep2Message1(nonceA));
}
public void GetMessageBytesTest()
{
// todo: refactor
var expectedSequence = new byte[] { (byte)SksAsn1Type.Sequence, 0x0E, (byte)SksAsn1Type.Printablestring, 0x03, 65, 66, 67, (byte)SksAsn1Type.OctetString, 0x05, 0x00, 0x01, 0x02, 0x03, 0x04, };
var expectedSequenceBase64 = Convert.ToBase64String(expectedSequence);
var expected = $"-----BEGIN INITIAL MESSAGE 1-----{expectedSequenceBase64}-----END INITIAL MESSAGE 1";
var messageBytes = PemParser.GetMessageContentBytes(expected);
CollectionAssert.AreEqual(expectedSequence, messageBytes);
}
public static ChatMessage FromString(string str)
{
var contentBytes = PemParser.GetMessageContentBytes(str);
var contentObjectsList = (List <object>)SksAsn1Parser.Parse(contentBytes);
var iv = (byte[])contentObjectsList[0];
var encryptedmessageBytes = (byte[])contentObjectsList[1];
var hmacBytes = (byte[])contentObjectsList[2];
return(new ChatMessage(iv, encryptedmessageBytes, hmacBytes));
}
public static HandshakeMessage2 FromString(string str)
{
var contentBytes = PemParser.GetMessageContentBytes(str);
var contentObjectsList = (List <object>)SksAsn1Parser.Parse(contentBytes);
var protocolId = (ProtocolType)(int)contentObjectsList[0];
//var ttps = (List<string>) contentObjectsList[1];
// todo: add TTPs
return(new HandshakeMessage2(protocolId, null));
}
public static HandshakeMessage1 FromString(string str)
{
var contentBytes = PemParser.GetMessageContentBytes(str);
var contentObjectsList = (List <object>)SksAsn1Parser.Parse(contentBytes);
var a = (string)contentObjectsList[0];
var b = (string)contentObjectsList[1];
var keyId = (byte[])contentObjectsList[2];
var passwordId = (byte[])contentObjectsList[3];
// todo: add TTPs
return(new HandshakeMessage1(a, b, keyId, passwordId, null));
}
public static KdcHelloResponse FromString(string message, byte[] kdcKey)
{
var contentBytes = PemParser.GetMessageContentBytes(message);
var contentObjectsList = (List <object>)SksAsn1Parser.Parse(contentBytes);
var iv = (byte[])contentObjectsList[0];
var encryptedPart = (byte[])contentObjectsList[1];
var decryptedSequence = SksAes.DecryptBytesFromBytes_Aes(encryptedPart, kdcKey, iv);
contentObjectsList = (List <object>)SksAsn1Parser.Parse(decryptedSequence);
var users = new List <User>();
foreach (var sequenceObj in contentObjectsList)
{
var sequence = (List <object>)sequenceObj;
var ip = (string)sequence[0];
var port = (string)sequence[1];
var name = (string)sequence[2];
var key = (byte[])sequence[3];
var pass = (string)sequence[4];
var user = new User
{
Password = pass,
Key = key,
Name = name,
IpAddress = ip,
Port = port,
};
users.Add(user);
}
return(new KdcHelloResponse
{
Users = users,
});
}