Converting text using Base64 in Linux and Windows

开发者_高级运维I need to encrypt text/files in base 64 so I can send them in an email (I can't do attachments). I can use openSSL and GPG in Linux to encrypt and decrypt but don't know how to do the same in Windows XP. Does anyone know a program that can do this for me in windows?

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EDITED AGAIN
In this link you can find how to encode/decode files.
I attach sample code:

private string FileToBase64(string srcFilename)
{
  if (!string.IsNullOrEmpty(srcFilename))
  {
    FileStream fs = new FileStream(srcFilename, 
                                   FileMode.Open, 
                                   FileAccess.Read);
    byte[] filebytes = new byte[fs.Length];
    fs.Read(filebytes, 0, Convert.ToInt32(fs.Length));
    string encodedData = Convert.ToBase64String(filebytes,
        Base64FormattingOptions.InsertLineBreaks);
    return encodedData; 
  }
}

private void Base64ToFile(string src, string dstFilename)
{
  if (!string.IsNullOrEmpty(dstFilename))
  {
    byte[] filebytes = Convert.FromBase64String(src);
    FileStream fs = new FileStream(dstFilename, 
                                   FileMode.CreateNew, 
                                   FileAccess.Write, 
                                   FileShare.None);
    fs.Write(filebytes, 0, filebytes.Length);
    fs.Close(); 
  }
}