AsymmetricAlgorithmHelpers.cs

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using System;
using System.Formats.Asn1;
using System.Security.Cryptography;
 
namespace Internal.Cryptography;
 
internal static class AsymmetricAlgorithmHelpers
{
    public static byte[] ConvertIeee1363ToDer(ReadOnlySpan<byte> input)
    {
        AsnWriter asnWriter = WriteIeee1363ToDer(input);
        return asnWriter.Encode();
    }
 
    private static AsnWriter WriteIeee1363ToDer(ReadOnlySpan<byte> input)
    {
        int num = input.Length / 2;
        AsnWriter asnWriter = new AsnWriter(AsnEncodingRules.DER);
        asnWriter.PushSequence();
        asnWriter.WriteKeyParameterInteger(input.Slice(0, num));
        asnWriter.WriteKeyParameterInteger(input.Slice(num, num));
        asnWriter.PopSequence();
        return asnWriter;
    }
}