Pbkdf2Params.cs

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using System.Formats.Asn1;
 
namespace System.Security.Cryptography.Asn1;
 
internal struct Pbkdf2Params
{
    internal System.Security.Cryptography.Asn1.Pbkdf2SaltChoice Salt;
 
    internal int IterationCount;
 
    internal int? KeyLength;
 
    internal System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn Prf;
 
    private static ReadOnlySpan<byte> DefaultPrf => new byte[14]
    {
        48, 12, 6, 8, 42, 134, 72, 134, 247, 13,
        2, 7, 5, 0
    };
 
    internal static System.Security.Cryptography.Asn1.Pbkdf2Params Decode(ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
    {
        return Decode(Asn1Tag.Sequence, encoded, ruleSet);
    }
 
    internal static System.Security.Cryptography.Asn1.Pbkdf2Params 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.Pbkdf2Params decoded)
    {
        decoded = default(System.Security.Cryptography.Asn1.Pbkdf2Params);
        System.Formats.Asn1.AsnValueReader reader2 = reader.ReadSequence(expectedTag);
        System.Security.Cryptography.Asn1.Pbkdf2SaltChoice.Decode(ref reader2, rebind, out decoded.Salt);
        if (!reader2.TryReadInt32(out decoded.IterationCount))
        {
            reader2.ThrowIfNotEmpty();
        }
        if (reader2.HasData && reader2.PeekTag().HasSameClassAndValue(Asn1Tag.Integer))
        {
            if (reader2.TryReadInt32(out var value))
            {
                decoded.KeyLength = value;
            }
            else
            {
                reader2.ThrowIfNotEmpty();
            }
        }
        if (reader2.HasData && reader2.PeekTag().HasSameClassAndValue(Asn1Tag.Sequence))
        {
            System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn.Decode(ref reader2, rebind, out decoded.Prf);
        }
        else
        {
            System.Formats.Asn1.AsnValueReader reader3 = new System.Formats.Asn1.AsnValueReader(DefaultPrf, AsnEncodingRules.DER);
            System.Security.Cryptography.Asn1.AlgorithmIdentifierAsn.Decode(ref reader3, rebind, out decoded.Prf);
        }
        reader2.ThrowIfNotEmpty();
    }
}