TimeAsn.cs

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using System.Formats.Asn1;
 
namespace System.Security.Cryptography.X509Certificates.Asn1;
 
internal struct TimeAsn
{
    internal DateTimeOffset? UtcTime;
 
    internal DateTimeOffset? GeneralTime;
 
    internal void Encode(AsnWriter writer)
    {
        bool flag = false;
        if (UtcTime.HasValue)
        {
            if (flag)
            {
                throw new CryptographicException();
            }
            writer.WriteUtcTime(UtcTime.Value);
            flag = true;
        }
        if (GeneralTime.HasValue)
        {
            if (flag)
            {
                throw new CryptographicException();
            }
            writer.WriteGeneralizedTime(GeneralTime.Value, omitFractionalSeconds: true);
            flag = true;
        }
        if (!flag)
        {
            throw new CryptographicException();
        }
    }
 
    internal static void Decode(ref System.Formats.Asn1.AsnValueReader reader, ReadOnlyMemory<byte> rebind, out TimeAsn 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 TimeAsn decoded)
    {
        decoded = default(TimeAsn);
        Asn1Tag asn1Tag = reader.PeekTag();
        if (asn1Tag.HasSameClassAndValue(Asn1Tag.UtcTime))
        {
            decoded.UtcTime = reader.ReadUtcTime();
            return;
        }
        if (asn1Tag.HasSameClassAndValue(Asn1Tag.GeneralizedTime))
        {
            decoded.GeneralTime = reader.ReadGeneralizedTime();
            if (decoded.GeneralTime.Value.Ticks % 10000000 == 0L)
            {
                return;
            }
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding);
        }
        throw new CryptographicException();
    }
 
    public TimeAsn(DateTimeOffset dateTimeOffset)
    {
        DateTime utcDateTime = dateTimeOffset.UtcDateTime;
        if (utcDateTime.Year >= 1950 && utcDateTime.Year < 2050)
        {
            UtcTime = utcDateTime;
            GeneralTime = null;
        }
        else
        {
            UtcTime = null;
            GeneralTime = utcDateTime;
        }
    }
}