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();
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);
}
#pragma warning restore CS8618
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($"Wrong key kind {data[0]} in license");
}
LicenseBlock block;
int read;
switch (data[33])
{
case 0:
var result = ReadNullString(data.Slice(46));
if (!result.Ok)
{
return(result.Error);
}
var nullStr = result.Value;
block = new IntermediateLicenseBlock(nullStr.str);
read = 5 + nullStr.read;
break;
case 2:
if (!Enum.IsDefined(typeof(ServerLicenseType), data[42]))
{
return($"Unknown license type {data[42]}");
}
result = ReadNullString(data.Slice(47));
if (!result.Ok)
{
return(result.Error);
}
nullStr = result.Value;
block = new ServerLicenseBlock(result.Value.str, (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 = Tools.UnixTimeStart.AddSeconds(BinaryPrimitives.ReadUInt32BigEndian(data.Slice(34)) + 0x50e22700uL);
block.NotValidAfter = Tools.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 = TsCrypt.Hash512It(data[1..allLen].ToArray());