using System;
using System.Text;
using System.Security.Cryptography.X509Certificates;
using System.IO;

namespace p7b2cer
{
    class Program
    {
        static void Main(string[] args)
        {
            byte[] data;
            using (FileStream file = new FileStream(args[0], FileMode.Open))
            {
                data = new byte[file.Length + 4096];
                int len = 0;
                int readed = 0;
                do
                {
                    readed = file.Read(data, len, 4096);
                    len += readed;
                } while (readed > 0);

            }
            X509Certificate2Collection collection = new X509Certificate2Collection();
            collection.Import(data);
            foreach (X509Certificate2 cert in collection)
            {
                string filename = args[1] + @"\" + cert.Thumbprint + ".cer";
                using (FileStream file = new FileStream(filename, FileMode.Create))
                {
                    byte[] bytes = cert.Export(X509ContentType.Cert);
                    file.Write(bytes, 0, bytes.Length);
                }
            }
        }
    }
}