public void CalculateProperly()
{
var username = "******";
var password = "******";
var realm = "twilio.com";
var message = new byte[]
{
0x00, 0x03, 0x00, 0x90, 0x21, 0x12, 0xa4, 0x42, 0xf5, 0xdb,
0xe7, 0xc1, 0x2a, 0x74, 0xbe, 0xf9, 0x8b, 0x16, 0x56, 0x3e,
0x00, 0x19, 0x00, 0x04, 0x06, 0x00, 0x00, 0x00, 0x00, 0x0d,
0x00, 0x04, 0x00, 0x00, 0x03, 0x09, 0x00, 0x06, 0x00, 0x40,
0x61, 0x65, 0x30, 0x36, 0x33, 0x33, 0x63, 0x64, 0x35, 0x38,
0x62, 0x61, 0x30, 0x39, 0x37, 0x61, 0x31, 0x31, 0x36, 0x37,
0x63, 0x36, 0x64, 0x32, 0x63, 0x63, 0x34, 0x65, 0x32, 0x33,
0x36, 0x64, 0x62, 0x35, 0x32, 0x32, 0x35, 0x36, 0x61, 0x34,
0x30, 0x64, 0x35, 0x36, 0x35, 0x66, 0x31, 0x31, 0x65, 0x64,
0x66, 0x37, 0x36, 0x63, 0x30, 0x32, 0x64, 0x31, 0x33, 0x64,
0x62, 0x39, 0x33, 0x63, 0x00, 0x15, 0x00, 0x10, 0x37, 0x35,
0x64, 0x34, 0x35, 0x34, 0x31, 0x39, 0x63, 0x33, 0x39, 0x33,
0x34, 0x33, 0x66, 0x65, 0x00, 0x14, 0x00, 0x0a, 0x74, 0x77,
0x69, 0x6c, 0x69, 0x6f, 0x2e, 0x63, 0x6f, 0x6d, 0x00, 0x00,
};
MessageIntegrity attr =
MessageIntegrity.Calculate(username, password, realm, message);
Assert.Equal(
new byte[]
{
0x77, 0xe8, 0xcf, 0x30, 0x9e, 0x85, 0x6c, 0x22, 0x72, 0x53,
0xa3, 0xb7, 0xe0, 0x35, 0x7c, 0xc2, 0x30, 0xfc, 0xbc, 0xf4,
},
attr.Value
);
}
public void EncodeToBytes()
{
byte[] digest = new byte[]
{
0xfd, 0x49, 0x5a, 0x92, 0xb5, 0x9f, 0x59, 0x67, 0x33, 0xce,
0xcf, 0xf4, 0x45, 0xb7, 0xa5, 0x88, 0x04, 0x8a, 0x39, 0x05,
};
var attr = new MessageIntegrity(digest);
Assert.Equal(
new byte[]
{
0x00, 0x08, 0x00, 0x14,
0xfd, 0x49, 0x5a, 0x92, 0xb5, 0x9f, 0x59, 0x67, 0x33, 0xce,
0xcf, 0xf4, 0x45, 0xb7, 0xa5, 0x88, 0x04, 0x8a, 0x39, 0x05,
},
attr.ToByteArray());
}
public byte[] Encode(IStunContext ctx)
{
bool useMessageIntegrity =
!string.IsNullOrEmpty(ctx?.Username) &&
!string.IsNullOrEmpty(ctx?.Password) &&
!string.IsNullOrEmpty(ctx?.Realm);
var c = (ushort)Class;
var m = (ushort)Method;
int type =
(m & 0x0f80) << 2 |
(m & 0x0070) << 1 |
(m & 0x000f) << 0 |
(c & 0x2) << 7 |
(c & 0x1) << 4;
using (var ms = new MemoryStream())
{
List <Attribute> attrs = Attributes.ToList();
if (!string.IsNullOrEmpty(ctx?.Username))
{
attrs.Add(new Username(ctx.Username));
}
if (ctx?.Nonce != null)
{
attrs.Add(new Attributes.Nonce(ctx.Nonce));
}
if (!string.IsNullOrEmpty(ctx?.Realm))
{
attrs.Add(new Realm(ctx.Realm));
}
byte[] encodedAttrs;
using (var ams = new MemoryStream())
{
foreach (Attribute attr in attrs)
{
byte[] asBytes = attr.ToByteArray(TransactionId);
ams.Write(asBytes, 0, asBytes.Length);
}
encodedAttrs = ams.ToArray();
}
// 8 bytes for Fingerprint
var messageLength =
(ushort)(encodedAttrs.Length + FingerprintBytes);
if (useMessageIntegrity)
{
messageLength += MessageIntegrityBytes;
}
ms.Write(((ushort)type).ToBytes(), 0, 2);
ms.Write(messageLength.ToBytes(), 0, 2);
ms.Write(MagicCookie, 0, MagicCookie.Length);
ms.Write(TransactionId, 0, TransactionId.Length);
ms.Write(encodedAttrs, 0, encodedAttrs.Length);
if (useMessageIntegrity)
{
var lengthWithoutFingerprint =
(ushort)(messageLength - FingerprintBytes);
byte[] toCalc = ms.ToArray();
lengthWithoutFingerprint.ToBytes().CopyTo(toCalc, 2);
MessageIntegrity mi =
MessageIntegrity.Calculate(
ctx?.Username,
ctx?.Password,
ctx?.Realm,
toCalc);
ms.Write(mi.ToByteArray(), 0, MessageIntegrityBytes);
}
Fingerprint fingerprint = Fingerprint.FromMessage(
ms.ToArray()
);
ms.Write(fingerprint.ToByteArray(), 0, FingerprintBytes);
return(ms.ToArray());
}
}
