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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#pragma warning disable SA1028 // ignore whitespace warnings for generated code
using System;
using System.Formats.Asn1;
using System.Runtime.InteropServices;
namespace System.Security.Cryptography.Pkcs.Asn1
{
[StructLayout(LayoutKind.Sequential)]
internal partial struct RecipientKeyIdentifier
{
internal ReadOnlyMemory<byte> SubjectKeyIdentifier;
internal DateTimeOffset? Date;
internal System.Security.Cryptography.Pkcs.Asn1.OtherKeyAttributeAsn? Other;
internal readonly void Encode(AsnWriter writer)
{
Encode(writer, Asn1Tag.Sequence);
}
internal readonly void Encode(AsnWriter writer, Asn1Tag tag)
{
writer.PushSequence(tag);
writer.WriteOctetString(SubjectKeyIdentifier.Span);
if (Date.HasValue)
{
writer.WriteGeneralizedTime(Date.Value, false);
}
if (Other.HasValue)
{
Other.Value.Encode(writer);
}
writer.PopSequence(tag);
}
internal static RecipientKeyIdentifier Decode(ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
{
return Decode(Asn1Tag.Sequence, encoded, ruleSet);
}
internal static RecipientKeyIdentifier Decode(Asn1Tag expectedTag, ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
{
try
{
AsnValueReader reader = new AsnValueReader(encoded.Span, ruleSet);
DecodeCore(ref reader, expectedTag, encoded, out RecipientKeyIdentifier decoded);
reader.ThrowIfNotEmpty();
return decoded;
}
catch (AsnContentException e)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding, e);
}
}
internal static void Decode(ref AsnValueReader reader, ReadOnlyMemory<byte> rebind, out RecipientKeyIdentifier decoded)
{
Decode(ref reader, Asn1Tag.Sequence, rebind, out decoded);
}
internal static void Decode(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory<byte> rebind, out RecipientKeyIdentifier 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 RecipientKeyIdentifier decoded)
{
decoded = default;
AsnValueReader sequenceReader = reader.ReadSequence(expectedTag);
ReadOnlySpan<byte> rebindSpan = rebind.Span;
int offset;
ReadOnlySpan<byte> tmpSpan;
if (sequenceReader.TryReadPrimitiveOctetString(out tmpSpan))
{
decoded.SubjectKeyIdentifier = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
else
{
decoded.SubjectKeyIdentifier = sequenceReader.ReadOctetString();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.GeneralizedTime))
{
decoded.Date = sequenceReader.ReadGeneralizedTime();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.Sequence))
{
System.Security.Cryptography.Pkcs.Asn1.OtherKeyAttributeAsn tmpOther;
System.Security.Cryptography.Pkcs.Asn1.OtherKeyAttributeAsn.Decode(ref sequenceReader, rebind, out tmpOther);
decoded.Other = tmpOther;
}
sequenceReader.ThrowIfNotEmpty();
}
}
}
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