/**
* build an object given its tag and the number of bytes to construct it from.
*/
private Asn1Object BuildObject(
int tag,
int tagNo,
int length)
{
bool isConstructed = (tag & Asn1Tags.Constructed) != 0;
DefiniteLengthInputStream defIn = new DefiniteLengthInputStream(this.s, length);
if ((tag & Asn1Tags.Application) != 0)
{
throw new IOException("invalid ECDSA sig");
}
if ((tag & Asn1Tags.Tagged) != 0)
{
throw new IOException("invalid ECDSA sig");
}
if (isConstructed)
{
switch (tagNo)
{
case Asn1Tags.Sequence:
return(CreateDerSequence(defIn));
default:
throw new IOException("unknown tag " + tagNo + " encountered");
}
}
return(CreatePrimitiveDerObject(tagNo, defIn, tmpBuffers));
}
internal static Asn1Object CreatePrimitiveDerObject(
int tagNo,
DefiniteLengthInputStream defIn,
byte[][] tmpBuffers)
{
switch (tagNo)
{
case Asn1Tags.Boolean:
throw new IOException("invalid ECDSA sig");
case Asn1Tags.Enumerated:
throw new IOException("invalid ECDSA sig");
case Asn1Tags.ObjectIdentifier:
throw new IOException("invalid ECDSA sig");
}
byte[] bytes = defIn.ToArray();
switch (tagNo)
{
case Asn1Tags.Integer:
return(new DerInteger(bytes));
default:
throw new IOException("unknown tag " + tagNo + " encountered");
}
}
internal static byte[] GetBuffer(DefiniteLengthInputStream defIn, byte[][] tmpBuffers)
{
int len = defIn.GetRemaining();
if (len >= tmpBuffers.Length)
{
return(defIn.ToArray());
}
byte[] buf = tmpBuffers[len];
if (buf == null)
{
buf = tmpBuffers[len] = new byte[len];
}
defIn.ReadAllIntoByteArray(buf);
return(buf);
}
internal virtual DerSequence CreateDerSequence(
DefiniteLengthInputStream dIn)
{
return(DerSequence.FromVector(BuildDerEncodableVector(dIn)));
}
internal virtual Asn1EncodableVector BuildDerEncodableVector(
DefiniteLengthInputStream dIn)
{
return(new Asn1InputStream(dIn).BuildEncodableVector());
}