public static ReadOnlyMemory <byte> GetOctetStringBytes(this AsnReader reader, Asn1Tag expectedTag)
{
if (reader.TryGetPrimitiveOctetStringBytes(expectedTag, out ReadOnlyMemory <byte> contents))
{
return(contents);
}
// Guaranteed too big, because it has the tag and length.
int length = reader.PeekEncodedValue().Length;
byte[] rented = ArrayPool <byte> .Shared.Rent(length);
try
{
if (reader.TryCopyOctetStringBytes(expectedTag, rented, out int bytesWritten))
{
return(new ReadOnlyMemory <byte>(rented.AsSpan(0, bytesWritten).ToArray()));
}
Debug.Fail("TryCopyOctetStringBytes produced more data than the encoded size");
throw new CryptographicException();
}
finally
{
Array.Clear(rented, 0, length);
ArrayPool <byte> .Shared.Return(rented);
}
}