ECDomainParameters.cs

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using System.Formats.Asn1;
 
namespace System.Security.Cryptography.Asn1;
 
internal struct ECDomainParameters
{
    internal System.Security.Cryptography.Asn1.SpecifiedECDomain? Specified;
 
    internal string Named;
 
    internal void Encode(AsnWriter writer)
    {
        bool flag = false;
        if (Specified.HasValue)
        {
            if (flag)
            {
                throw new CryptographicException();
            }
            Specified.Value.Encode(writer);
            flag = true;
        }
        if (Named != null)
        {
            if (flag)
            {
                throw new CryptographicException();
            }
            try
            {
                writer.WriteObjectIdentifier(Named);
            }
            catch (ArgumentException inner)
            {
                throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner);
            }
            flag = true;
        }
        if (!flag)
        {
            throw new CryptographicException();
        }
    }
 
    internal static System.Security.Cryptography.Asn1.ECDomainParameters Decode(ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
    {
        try
        {
            System.Formats.Asn1.AsnValueReader reader = new System.Formats.Asn1.AsnValueReader(encoded.Span, ruleSet);
            DecodeCore(ref reader, encoded, out var decoded);
            reader.ThrowIfNotEmpty();
            return decoded;
        }
        catch (AsnContentException inner)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner);
        }
    }
 
    internal static void Decode(ref System.Formats.Asn1.AsnValueReader reader, ReadOnlyMemory<byte> rebind, out System.Security.Cryptography.Asn1.ECDomainParameters decoded)
    {
        try
        {
            DecodeCore(ref reader, rebind, out decoded);
        }
        catch (AsnContentException inner)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner);
        }
    }
 
    private static void DecodeCore(ref System.Formats.Asn1.AsnValueReader reader, ReadOnlyMemory<byte> rebind, out System.Security.Cryptography.Asn1.ECDomainParameters decoded)
    {
        decoded = default(System.Security.Cryptography.Asn1.ECDomainParameters);
        Asn1Tag asn1Tag = reader.PeekTag();
        if (asn1Tag.HasSameClassAndValue(Asn1Tag.Sequence))
        {
            System.Security.Cryptography.Asn1.SpecifiedECDomain.Decode(ref reader, rebind, out var decoded2);
            decoded.Specified = decoded2;
            return;
        }
        if (asn1Tag.HasSameClassAndValue(Asn1Tag.ObjectIdentifier))
        {
            decoded.Named = reader.ReadObjectIdentifier();
            return;
        }
        throw new CryptographicException();
    }
}