Calculate MD5 hash that can be used when interacting with a PHP-website. Note: MD5 has been cracked and shouldn't be used in new systems.

phpmd5.fs

let phpMd5 (dataToHash:string) = 
    use md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
    let encodedBytes = dataToHash |> System.Text.ASCIIEncoding.Default.GetBytes |> md5.ComputeHash
    System.Text.RegularExpressions.Regex.Replace(System.BitConverter.ToString(encodedBytes), "-", "").ToLower()