public void AddCryptoLine(string crypto)
{
this.SecurityDescriptions.Add(SDPSecurityDescription.Parse(crypto));
}
public static bool TryParse(string cryptoLine, out SDPSecurityDescription securityDescription)
{
securityDescription = null;
if (string.IsNullOrWhiteSpace(cryptoLine))
{
return(false);
}
if (!cryptoLine.StartsWith(CRYPTO_ATTRIBUE_PREFIX))
{
throw new FormatException(
$"cryptoLine '{cryptoLine}' is not recognized as a valid SDP Security Description ");
}
string sCryptoValue = cryptoLine.Substring(cryptoLine.IndexOf(COLON) + 1);
securityDescription = new SDPSecurityDescription();
string[] sCryptoParts =
sCryptoValue.Split(securityDescription.WHITE_SPACES, StringSplitOptions.RemoveEmptyEntries);
if (sCryptoValue.Length < 2)
{
throw new FormatException(
$"cryptoLine '{cryptoLine}' is not recognized as a valid SDP Security Description ");
}
try
{
securityDescription.Tag = uint.Parse(sCryptoParts[0]);
securityDescription.CryptoSuite =
(from e in Enum.GetNames(typeof(CryptoSuites))
where e.CompareTo(sCryptoParts[1]) == 0
select(CryptoSuites) Enum.Parse(typeof(CryptoSuites), e)).FirstOrDefault();
if (securityDescription.CryptoSuite == CryptoSuites.unknown)
{
//this may not be a reason to return FALSE
//there might be a new crypto key used
}
string[] sKeyParams = sCryptoParts[2].Split(SEMI_COLON);
if (sKeyParams.Length < 1)
{
securityDescription = null;
return(false);
}
foreach (string kp in sKeyParams)
{
KeyParameter keyParam = KeyParameter.Parse(kp, securityDescription.CryptoSuite);
securityDescription.KeyParams.Add(keyParam);
}
if (sCryptoParts.Length > 3)
{
securityDescription.SessionParam =
SessionParameter.Parse(sCryptoParts[3], securityDescription.CryptoSuite);
}
return(true);
}
catch
{
//catch all errors and throw own FormatException
}
return(false);
}
