I'm currently using the built-in methods in Windows Phone and Silverlight to create a SHA1 hash of a string. This is the code:

```
private static string CalculateSHA1(string text)
    {
        SHA1Managed s = new SHA1Managed();
        UTF8Encoding enc = new UTF8Encoding();
        s.ComputeHash(enc.GetBytes(text.ToCharArray()));
        System.Diagnostics.Debug.WriteLine("Original Text {0}, Access {1}", text, Convert.ToBase64String(s.Hash));
        return Convert.ToBase64String(s.Hash);
    }

```

For example, I tried generating a hash for this string: "hello". 

Silverlight Output: `LPJNul+wow4m6DsqxbninhsWHlwfp0JecwQzYpOLmCQ=`

Correct Output: `aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d`

What I am doing wrong in the code?