c# : How to hash a string to MD5

MD5 hash is a method to obtain a unique "signature" from a string. It is very usefull in order to store password, but be aware that there is no way to get back to the original string, starting from the hash.

I use it for creating unique filename for caching url crawling.

Here is a snipped of a method that give the MD5 hash from a string:

private string HashString(string Value)
{
        System.Security.Cryptography.MD5CryptoServiceProvider x = new System.Security.Cryptography.MD5CryptoServiceProvider();
        byte[] data = System.Text.Encoding.ASCII.GetBytes(Value);
        data = x.ComputeHash(data);
        string ret = "";
        for (int i=0; i < data.Length; i++)
                ret += data[i].ToString("x2").ToLower();
        return ret;
}

lundi 12 mai 2008 | Predicate<T>

Cher Entreprenaute, vous pouvez trouver ici votre passeport pour l'economie numerique