Here is sample code that kinda does the same thing as that keypal tool. It enumerates all containers (for the local machine) and from there gets the one that can become StrongNameKeyPairs. Usually, strong name keys have a 160 bytes-length public key (SHA1):

foreach (var kc in KeyUtilities.EnumerateKeyContainers("Microsoft Strong Cryptographic Provider"))
{
    CspParameters cspParams = new CspParameters();
    cspParams.KeyContainerName = kc;
    cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
    using (RSACryptoServiceProvider prov = new RSACryptoServiceProvider(cspParams))
    {
        if (prov.CspKeyContainerInfo.Exportable)
        {
            var blob = prov.ExportCspBlob(true);
            StrongNameKeyPair kp = new StrongNameKeyPair(prov.ExportCspBlob(false));
            Console.WriteLine(kc + " pk length:" + kp.PublicKey.Length);
        }
    }
    Console.WriteLine();
}

...

public static class KeyUtilities
{
    public static IList<string> EnumerateKeyContainers(string provider)
    {
        ProvHandle prov;
        if (!CryptAcquireContext(out prov, null, provider, PROV_RSA_FULL, CRYPT_MACHINE_KEYSET | CRYPT_VERIFYCONTEXT))
            throw new Win32Exception(Marshal.GetLastWin32Error());

        List<string> list = new List<string>();
        IntPtr data = IntPtr.Zero;
        try
        {
            int flag = CRYPT_FIRST;
            int len = 0;
            if (!CryptGetProvParam(prov, PP_ENUMCONTAINERS, IntPtr.Zero, ref len, flag))
            {
                if (Marshal.GetLastWin32Error() != ERROR_MORE_DATA)
                    throw new Win32Exception(Marshal.GetLastWin32Error());
            }

            data = Marshal.AllocHGlobal(len);
            do
            {
                if (!CryptGetProvParam(prov, PP_ENUMCONTAINERS, data, ref len, flag))
                {
                    if (Marshal.GetLastWin32Error() == ERROR_NO_MORE_ITEMS)
                        break;

                    throw new Win32Exception(Marshal.GetLastWin32Error());
                }

                list.Add(Marshal.PtrToStringAnsi(data));
                flag = CRYPT_NEXT;
            }
            while (true);
        }
        finally
        {
            if (data != IntPtr.Zero)
            {
                Marshal.FreeHGlobal(data);
            }

            prov.Dispose();
        }
        return list;
    }

    private sealed class ProvHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        public ProvHandle()
            : base(true)
        {
        }

        protected override bool ReleaseHandle()
        {
            return CryptReleaseContext(handle, 0);
        }

        [DllImport("advapi32.dll")]
        private static extern bool CryptReleaseContext(IntPtr hProv, int dwFlags);

    }

    const int PP_ENUMCONTAINERS = 2;
    const int PROV_RSA_FULL = 1;
    const int ERROR_MORE_DATA = 234;
    const int ERROR_NO_MORE_ITEMS = 259;
    const int CRYPT_FIRST = 1;
    const int CRYPT_NEXT = 2;
    const int CRYPT_MACHINE_KEYSET = 0x20;
    const int CRYPT_VERIFYCONTEXT = unchecked((int)0xF0000000);

    [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern bool CryptAcquireContext(out ProvHandle phProv, string pszContainer, string pszProvider, int dwProvType, int dwFlags);

    [DllImport("advapi32.dll", SetLastError = true)]
    private static extern bool CryptGetProvParam(ProvHandle hProv, int dwParam, IntPtr pbData, ref int pdwDataLen, int dwFlags);
}

The following Namespaces are referenced:

using Microsoft.Win32.SafeHandles;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Security.Cryptography;