public static R<Licenses, string> Parse(ReadOnlySpan<byte> data)
{
if (data.Length < 1)
return "License too short";
var version = data[0];
if (version != 1)
return "Unsupported version";
// Read licenses
var res = new Licenses { Blocks = new List<LicenseBlock>() };
data = data.Slice(1);
while (data.Length > 0)
{
// Read next license
var result = LicenseBlock.Parse(data);
if (!result.Ok)
return result.Error;
var (license, len) = result.Value;
// TODO Check valid times
res.Blocks.Add(license);
data = data.Slice(len);
}
return res;
}
public static R<(LicenseBlock block, int read), string> Parse(ReadOnlySpan<byte> data)
{
if (data.Length < MinBlockLen)
{
return "License too short";
}
if (data[0] != 0)
{
return $"Wrong key kind {data[0]} in license";
}
LicenseBlock block;
int read;
switch (data[33])
{
case 0:
var result = ReadNullString(data.Slice(46));
if (!result.Ok) return result.Error;
var nullStr = result.Value;
block = new IntermediateLicenseBlock { Issuer = nullStr.str };
read = 5 + nullStr.read;
break;
case 2:
if (!Enum.IsDefined(typeof(ServerLicenseType), data[42]))
return $"Unknown license type {data[42]}";
result = ReadNullString(data.Slice(47));
if (!result.Ok) return result.Error;
nullStr = result.Value;
block = new ServerLicenseBlock { Issuer = result.Value.str, LicenseType = (ServerLicenseType)data[42] };
read = 6 + nullStr.read;
break;
case 32:
block = new EphemeralLicenseBlock();
read = 0;
break;
default:
return $"Invalid license block type {data[33]}";
}
block.NotValidBefore = Util.UnixTimeStart.AddSeconds(BinaryPrimitives.ReadUInt32BigEndian(data.Slice(34)) + 0x50e22700uL);
block.NotValidAfter = Util.UnixTimeStart.AddSeconds(BinaryPrimitives.ReadUInt32BigEndian(data.Slice(38)) + 0x50e22700uL);
if (block.NotValidAfter < block.NotValidBefore)
return "License times are invalid";
block.Key = data.Slice(1, 32).ToArray();
var allLen = MinBlockLen + read;
var hash = Ts3Crypt.Hash512It(data.Slice(1, allLen - 1).ToArray());
block.Hash = hash.AsSpan(0, 32).ToArray();
return (block, allLen);
}
