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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 EssCertIdV2
{
private static ReadOnlySpan<byte> DefaultHashAlgorithm => [0x30, 0x0B, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01];
internal System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn HashAlgorithm;
internal ReadOnlyMemory<byte> Hash;
internal System.Security.Cryptography.Pkcs.Asn1.CadesIssuerSerial? IssuerSerial;
#if DEBUG
static EssCertIdV2()
{
EssCertIdV2 decoded = default;
ReadOnlyMemory<byte> rebind = default;
AsnValueReader reader;
reader = new AsnValueReader(DefaultHashAlgorithm, AsnEncodingRules.DER);
System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn.Decode(ref reader, rebind, out decoded.HashAlgorithm);
reader.ThrowIfNotEmpty();
}
#endif
internal readonly void Encode(AsnWriter writer)
{
Encode(writer, Asn1Tag.Sequence);
}
internal readonly void Encode(AsnWriter writer, Asn1Tag tag)
{
writer.PushSequence(tag);
// DEFAULT value handler for HashAlgorithm.
{
AsnWriter tmp = new AsnWriter(AsnEncodingRules.DER);
HashAlgorithm.Encode(tmp);
if (!tmp.EncodedValueEquals(DefaultHashAlgorithm))
{
tmp.CopyTo(writer);
}
}
writer.WriteOctetString(Hash.Span);
if (IssuerSerial.HasValue)
{
IssuerSerial.Value.Encode(writer);
}
writer.PopSequence(tag);
}
internal static EssCertIdV2 Decode(ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
{
return Decode(Asn1Tag.Sequence, encoded, ruleSet);
}
internal static EssCertIdV2 Decode(Asn1Tag expectedTag, ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
{
try
{
AsnValueReader reader = new AsnValueReader(encoded.Span, ruleSet);
DecodeCore(ref reader, expectedTag, encoded, out EssCertIdV2 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 EssCertIdV2 decoded)
{
Decode(ref reader, Asn1Tag.Sequence, rebind, out decoded);
}
internal static void Decode(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory<byte> rebind, out EssCertIdV2 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 EssCertIdV2 decoded)
{
decoded = default;
AsnValueReader sequenceReader = reader.ReadSequence(expectedTag);
AsnValueReader defaultReader;
ReadOnlySpan<byte> rebindSpan = rebind.Span;
int offset;
ReadOnlySpan<byte> tmpSpan;
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.Sequence))
{
System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn.Decode(ref sequenceReader, rebind, out decoded.HashAlgorithm);
}
else
{
defaultReader = new AsnValueReader(DefaultHashAlgorithm, AsnEncodingRules.DER);
System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn.Decode(ref defaultReader, rebind, out decoded.HashAlgorithm);
}
if (sequenceReader.TryReadPrimitiveOctetString(out tmpSpan))
{
decoded.Hash = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
else
{
decoded.Hash = sequenceReader.ReadOctetString();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.Sequence))
{
System.Security.Cryptography.Pkcs.Asn1.CadesIssuerSerial tmpIssuerSerial;
System.Security.Cryptography.Pkcs.Asn1.CadesIssuerSerial.Decode(ref sequenceReader, rebind, out tmpIssuerSerial);
decoded.IssuerSerial = tmpIssuerSerial;
}
sequenceReader.ThrowIfNotEmpty();
}
}
}
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