internal static bool IsValidReachSid(SecurityIdentifier sid)
{
if (!ExternalUser.IsExternalUserSid(sid))
{
return(false);
}
string text = sid.ToString();
int num = text.LastIndexOf('-');
string a = text.Substring(num + 1);
string input = text.Substring(0, num + 1);
string b = ExternalUser.ComputeHash(input);
return(string.Equals(a, b, StringComparison.Ordinal));
}
private static SecurityIdentifier GenerateSid(string source, bool forReachUser)
{
if (forReachUser)
{
source = Guid.NewGuid() + source;
}
byte[] sha1Hash = CryptoUtil.GetSha1Hash(Encoding.Unicode.GetBytes(source));
for (int i = 0; i < 4; i++)
{
byte[] array = sha1Hash;
int num = i;
array[num] ^= sha1Hash[i + 16];
}
BinaryReader binaryReader = null;
SecurityIdentifier result;
try
{
binaryReader = new BinaryReader(new MemoryStream(sha1Hash));
StringBuilder stringBuilder = new StringBuilder("S-1-8-");
for (int j = 0; j < 4; j++)
{
if (j == 3 && forReachUser)
{
stringBuilder.Append(ExternalUser.ComputeHash(stringBuilder.ToString()));
}
else
{
stringBuilder.Append(binaryReader.ReadUInt32().ToString(NumberFormatInfo.InvariantInfo));
}
if (j < 3)
{
stringBuilder.Append('-');
}
}
result = new SecurityIdentifier(stringBuilder.ToString());
}
finally
{
if (binaryReader != null)
{
binaryReader.Dispose();
binaryReader = null;
}
}
return(result);
}