internal static void Decode(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory <byte> rebind, out SignerInfoAsn decoded)
{
decoded = default;
AsnValueReader sequenceReader = reader.ReadSequence(expectedTag);
AsnValueReader collectionReader;
ReadOnlySpan <byte> rebindSpan = rebind.Span;
int offset;
ReadOnlySpan <byte> tmpSpan;
if (!sequenceReader.TryReadInt32(out decoded.Version))
{
sequenceReader.ThrowIfNotEmpty();
}
SignerIdentifierAsn.Decode(ref sequenceReader, rebind, out decoded.Sid);
AlgorithmIdentifierAsn.Decode(ref sequenceReader, rebind, out decoded.DigestAlgorithm);
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 0)))
{
tmpSpan = sequenceReader.ReadEncodedValue();
decoded.SignedAttributes = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
decoded.SignedAttributesSet = SignedAttributesSet.Decode(decoded.SignedAttributes.Value, AsnEncodingRules.BER);
}
AlgorithmIdentifierAsn.Decode(ref sequenceReader, rebind, out decoded.SignatureAlgorithm);
if (sequenceReader.TryReadPrimitiveOctetStringBytes(out tmpSpan))
{
decoded.SignatureValue = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
else
{
decoded.SignatureValue = sequenceReader.ReadOctetString();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 1)))
{
// Decode SEQUENCE OF for UnsignedAttributes
{
collectionReader = sequenceReader.ReadSetOf(new Asn1Tag(TagClass.ContextSpecific, 1));
var tmpList = new List <AttributeAsn>();
AttributeAsn tmpItem;
while (collectionReader.HasData)
{
AttributeAsn.Decode(ref collectionReader, rebind, out tmpItem);
tmpList.Add(tmpItem);
}
decoded.UnsignedAttributes = tmpList.ToArray();
}
}
sequenceReader.ThrowIfNotEmpty();
}
internal static void Decode(ref AsnValueReader reader, ReadOnlyMemory <byte> rebind, out SignerIdentifierAsn decoded)
{
decoded = default;
Asn1Tag tag = reader.PeekTag();
ReadOnlySpan <byte> rebindSpan = rebind.Span;
int offset;
ReadOnlySpan <byte> tmpSpan;
if (tag.HasSameClassAndValue(Asn1Tag.Sequence))
{
IssuerAndSerialNumberAsn tmpIssuerAndSerialNumber;
IssuerAndSerialNumberAsn.Decode(ref reader, rebind, out tmpIssuerAndSerialNumber);
decoded.IssuerAndSerialNumber = tmpIssuerAndSerialNumber;
}
else if (tag.HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 0)))
{
if (reader.TryReadPrimitiveOctetStringBytes(new Asn1Tag(TagClass.ContextSpecific, 0), out tmpSpan))
{
decoded.SubjectKeyIdentifier = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
}
else
{
decoded.SubjectKeyIdentifier = reader.ReadOctetString(new Asn1Tag(TagClass.ContextSpecific, 0));
}
}
else
{
throw new CryptographicException();
}
}
