internal static void Decode(AsnReader reader, out CurveAsn decoded)
{
if (reader == null)
throw new ArgumentNullException(nameof(reader));
Decode(reader, Asn1Tag.Sequence, out decoded);
}
internal static void Decode(AsnReader reader, Asn1Tag expectedTag, out CurveAsn decoded)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
decoded = default;
AsnReader sequenceReader = reader.ReadSequence(expectedTag);
if (sequenceReader.TryReadPrimitiveOctetStringBytes(out ReadOnlyMemory <byte> tmpA))
{
decoded.A = tmpA;
}
else
{
decoded.A = sequenceReader.ReadOctetString();
}
if (sequenceReader.TryReadPrimitiveOctetStringBytes(out ReadOnlyMemory <byte> tmpB))
{
decoded.B = tmpB;
}
else
{
decoded.B = sequenceReader.ReadOctetString();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.PrimitiveBitString))
{
if (sequenceReader.TryReadPrimitiveBitStringValue(out _, out ReadOnlyMemory <byte> tmpSeed))
{
decoded.Seed = tmpSeed;
}
else
{
decoded.Seed = sequenceReader.ReadBitString(out _);
}
}
sequenceReader.ThrowIfNotEmpty();
}
internal static void Decode(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory <byte> rebind, out CurveAsn decoded)
{
try
{
DecodeCore(ref reader, expectedTag, rebind, out decoded);
}
catch (AsnContentException e)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding, e);
}
}
private static void DecodeCore(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory <byte> rebind, out CurveAsn decoded)
{
decoded = default;
AsnValueReader sequenceReader = reader.ReadSequence(expectedTag);
ReadOnlySpan <byte> rebindSpan = rebind.Span;
int offset;
ReadOnlySpan <byte> tmpSpan;
if (sequenceReader.TryReadPrimitiveOctetString(out tmpSpan))
{
decoded.A = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
else
{
decoded.A = sequenceReader.ReadOctetString();
}
if (sequenceReader.TryReadPrimitiveOctetString(out tmpSpan))
{
decoded.B = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
else
{
decoded.B = sequenceReader.ReadOctetString();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.PrimitiveBitString))
{
if (sequenceReader.TryReadPrimitiveBitString(out _, out tmpSpan))
{
decoded.Seed = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
else
{
decoded.Seed = sequenceReader.ReadBitString(out _);
}
}
sequenceReader.ThrowIfNotEmpty();
}
internal static void Decode(ref AsnValueReader reader, ReadOnlyMemory <byte> rebind, out CurveAsn decoded)
{
Decode(ref reader, Asn1Tag.Sequence, rebind, out decoded);
}