private IAsn1Element ParseSequence(Asn1ParsedElement element)
{
using (var dataStream = new MemoryStream(element.Data))
{
var childElements = Parse(dataStream).ToArray();
var sequence = new Sequence(childElements);
return(sequence);
}
}
private IAsn1Element ParseSequence(Asn1ParsedElement element)
{
using (var dataStream = new MemoryStream(element.Data))
{
var childElements = Parse(dataStream).ToArray();
var sequence = new Sequence(childElements);
return sequence;
}
}
private static Asn1ParsedElement GetAsn1ParsedElement(BinaryReader reader)
{
var tag = reader.ReadByte();
uint length = (uint)reader.ReadByte();
if (length > 128)
{
length = length - 128;
switch (length)
{
case 1:
length = reader.ReadByte();
break;
case 2:
length = (uint)reader.ReadByte() * 256 + (uint)reader.ReadByte();
break;
case 3:
length = (uint)reader.ReadByte() * 256 * 256 + (uint)reader.ReadByte() * 256 + (uint)reader.ReadByte();
break;
case 4:
length = (uint)reader.ReadByte() * 256 * 256 * 256 + (uint)reader.ReadByte() * 256 * 256 + (uint)reader.ReadByte() * 256 + (uint)reader.ReadByte();
break;
default:
throw new NotImplementedException(
"asn elements with more than 4 length bytes are not supported");
}
}
if (length > int.MaxValue)
{
throw new NotImplementedException("asn elements with length > int.MaxValue are not supported");
}
var data = new byte[length];
reader.Read(data, 0, (int)length);
var element = new Asn1ParsedElement()
{
Tag = tag, Data = data
};
return(element);
}
private IAsn1Element ParseInteger(Asn1ParsedElement element)
{
if (element.Data.Length == 0)
{
return(new Integer(new byte[0]));
}
if (element.Data[0] == 0)
{
if (element.Data.Length == 1)
{
return(new Integer(new byte[] { 0 }));
}
if (element.Data[1] <= 127)
{
return(new Integer(element.Data));
}
return(new Integer(element.Data.Skip(1).ToArray()));
}
return(new Integer(element.Data));
}
private IAsn1Element ParseInteger(Asn1ParsedElement element)
{
if (element.Data.Length == 0)
{
return new Integer(new byte[0]);
}
if (element.Data[0] == 0)
{
if (element.Data.Length == 1)
{
return new Integer(new byte[] { 0 });
}
if (element.Data[1] <= 127)
{
return new Integer(element.Data);
}
return new Integer(element.Data.Skip(1).ToArray());
}
return new Integer(element.Data);
}
private IAsn1Element ParseOctetString(Asn1ParsedElement element)
{
return(new OctetString(element.Data));
}
private static Asn1ParsedElement GetAsn1ParsedElement(BinaryReader reader)
{
var tag = reader.ReadByte();
uint length = (uint) reader.ReadByte();
if (length > 128)
{
length = length - 128;
switch (length)
{
case 1:
length = reader.ReadByte();
break;
case 2:
length = (uint)reader.ReadByte() * 256 + (uint)reader.ReadByte();
break;
case 3:
length = (uint)reader.ReadByte() * 256 * 256 + (uint)reader.ReadByte() * 256 + (uint)reader.ReadByte();
break;
case 4:
length = (uint)reader.ReadByte() * 256 * 256 * 256 + (uint)reader.ReadByte() * 256 * 256 + (uint)reader.ReadByte() * 256 + (uint)reader.ReadByte();
break;
default:
throw new NotImplementedException(
"asn elements with more than 4 length bytes are not supported");
}
}
if (length > int.MaxValue)
{
throw new NotImplementedException("asn elements with length > int.MaxValue are not supported");
}
var data = new byte[length];
reader.Read(data, 0, (int) length);
var element = new Asn1ParsedElement() {Tag = tag, Data = data};
return element;
}
private IAsn1Element ParseOctetString(Asn1ParsedElement element)
{
return new OctetString(element.Data);
}
