Pbkdf2SaltChoice.cs

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using System.Formats.Asn1;
 
namespace System.Security.Cryptography.Asn1;
 
internal struct Pbkdf2SaltChoice
{
    internal ReadOnlyMemory<byte>? Specified;
 
    internal System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn? OtherSource;
 
    internal static void Decode(ref System.Formats.Asn1.AsnValueReader reader, ReadOnlyMemory<byte> rebind, out System.Security.Cryptography.Asn1.Pbkdf2SaltChoice 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.Pbkdf2SaltChoice decoded)
    {
        decoded = default(System.Security.Cryptography.Asn1.Pbkdf2SaltChoice);
        Asn1Tag asn1Tag = reader.PeekTag();
        ReadOnlySpan<byte> span = rebind.Span;
        if (asn1Tag.HasSameClassAndValue(Asn1Tag.PrimitiveOctetString))
        {
            if (reader.TryReadPrimitiveOctetString(out var value))
            {
                decoded.Specified = (span.Overlaps(value, out var elementOffset) ? rebind.Slice(elementOffset, value.Length) : ((ReadOnlyMemory<byte>)value.ToArray()));
            }
            else
            {
                decoded.Specified = reader.ReadOctetString();
            }
            return;
        }
        if (asn1Tag.HasSameClassAndValue(Asn1Tag.Sequence))
        {
            System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn.Decode(ref reader, rebind, out var decoded2);
            decoded.OtherSource = decoded2;
            return;
        }
        throw new CryptographicException();
    }
}