private KnownHost(string hostName, string keyType, string base64Pubkey, HostPubkeyMarker marker)
{
_isHashed = hostName.StartsWith("|");
if (_isHashed)
{
if (!hostName.StartsWith(HashedHostSignifier))
{
throw new FormatException("The hashed section was not properly composed");
}
string[] splitHashedSection = hostName.Split('|');
if (splitHashedSection.Length != 4)
{
throw new FormatException("The hashed section was not properly composed");
}
_hashSalt = Convert.FromBase64String(splitHashedSection[2]);
if (_hashSalt.Length != 20)
{
throw new ArgumentException("The salt must be exacly 20 bytes");
}
_hashedHostName = Convert.FromBase64String(splitHashedSection[3]);
}
else
{
_plaintextHostPatterns = GetPatternList(hostName);
if (_plaintextHostPatterns.Count == 0)
{
throw new FormatException("No hostname patterns given");
}
}
_keyType = keyType;
_pubKey = Convert.FromBase64String(base64Pubkey);
_hostMarker = marker;
}
private static bool UnsafeTryParse(string hostLine, out KnownHost host)
{
host = null;
if (string.IsNullOrEmpty(hostLine) || hostLine.StartsWith("#"))
{
return(false);
}
bool hasSpecialPrefix = hostLine.StartsWith("@");
string[] sectionedLine = hostLine.Split(' ');
if (hasSpecialPrefix && sectionedLine.Length < 4)
{
return(false);
}
else if (sectionedLine.Length < 3)
{
return(false);
}
HostPubkeyMarker marker =
hasSpecialPrefix ? ParseSpecialOperand(sectionedLine[0]) : HostPubkeyMarker.None;
if (marker == HostPubkeyMarker.Error)
{
return(false);
}
int sectionOffset = hasSpecialPrefix ? 1 : 0;
string hostNameSecion = sectionedLine[sectionOffset];
string keyTypeSection = sectionedLine[1 + sectionOffset];
string pubKeySection = sectionedLine[2 + sectionOffset];
host = new KnownHost(hostNameSecion, keyTypeSection, pubKeySection, marker);
return(true);
}
