PBEParameter.cs

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using System.Formats.Asn1;
 
namespace System.Security.Cryptography.Asn1;
 
internal struct PBEParameter
{
    internal ReadOnlyMemory<byte> Salt;
 
    internal int IterationCount;
 
    internal static System.Security.Cryptography.Asn1.PBEParameter Decode(ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
    {
        return Decode(Asn1Tag.Sequence, encoded, ruleSet);
    }
 
    internal static System.Security.Cryptography.Asn1.PBEParameter Decode(Asn1Tag expectedTag, ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
    {
        try
        {
            System.Formats.Asn1.AsnValueReader reader = new System.Formats.Asn1.AsnValueReader(encoded.Span, ruleSet);
            DecodeCore(ref reader, expectedTag, encoded, out var decoded);
            reader.ThrowIfNotEmpty();
            return decoded;
        }
        catch (AsnContentException inner)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner);
        }
    }
 
    private static void DecodeCore(ref System.Formats.Asn1.AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory<byte> rebind, out System.Security.Cryptography.Asn1.PBEParameter decoded)
    {
        decoded = default(System.Security.Cryptography.Asn1.PBEParameter);
        System.Formats.Asn1.AsnValueReader asnValueReader = reader.ReadSequence(expectedTag);
        ReadOnlySpan<byte> span = rebind.Span;
        if (asnValueReader.TryReadPrimitiveOctetString(out var value))
        {
            decoded.Salt = (span.Overlaps(value, out var elementOffset) ? rebind.Slice(elementOffset, value.Length) : ((ReadOnlyMemory<byte>)value.ToArray()));
        }
        else
        {
            decoded.Salt = asnValueReader.ReadOctetString();
        }
        if (!asnValueReader.TryReadInt32(out decoded.IterationCount))
        {
            asnValueReader.ThrowIfNotEmpty();
        }
        asnValueReader.ThrowIfNotEmpty();
    }
}