C# Unsafe code translation?

Question

I have some code that I'm using in a standard C# application. I'm sharing the library in a silverlight project that doesn't allow unsafe code. I don't know much at all about unsafe/pointer logic/arethmetic and was wondering if someone could translate the following code snippet so that it will run without /unsafe. I don't care about the performance drop since the code won't be called often on the client. Thanks in advance for any assistance.

public static unsafe int GetStableHash(string name) 
    { 
        fixed (char* str = name) 
        { 
            char* chPtr = str; 
            int num = 352654597; 
            int num2 = num; 
            int* numPtr = (int*)chPtr; 
            for (int i = name.Length; i > 0; i -= 4) 
            { 
                num = (((num << 5) + num) + (num >> 27)) ^ numPtr[0]; 
                if (i <= 2) 
                { 
                    break; 
                } 
                num2 = (((num2 << 5) + num2) + (num2 >> 27)) ^ numPtr[1]; 
                numPtr += 2; 
            } 
            return (num + (num2 * 1566083941)); 
        } 
    }

@JeffMercado Thanks again for your time here guys. I appreciate it. I've tried your updated version and now I get the exception on line

num = (((num << 5) + num) + (num >> 27)) ^ BitConverter.ToInt32(bytes, j + 0);

The test code I'm using is

string[] tmp = new string[]
        {
            "Hello",
            "Isn't that Æegis over there?",
            "Isn't that something",
            "11111111111",
            "111",
            "112"};
            foreach (string s in tmp)
            {
                int one = GetStableHash(s);
                int two = GetStableHashSafe(s);

                System.Diagnostics.Debug.WriteLine(one + " : " + two + " == " + (one == two).ToString());
            }

Answer 1

This should be pretty much equivalent if I'm not mistaken.

public static int GetStableHashSafe(string name)
{
    var bytes = Encoding.Unicode.GetBytes(name + "\0"); //HACK: need null terminator for odd counts
    int num = 0x15051505;
    int num2 = num;
    int j = 0;
    for (int i = name.Length; i > 0; i -= 4)
    {
        num = (((num << 5) + num) + (num >> 27)) ^ BitConverter.ToInt32(bytes, j + 0);
        if (i <= 2) break;
        num2 = (((num2 << 5) + num2) + (num2 >> 27)) ^ BitConverter.ToInt32(bytes, j + 4);
        j += 8;
    }
    return (num + (num2 * 0x5D588B65));
}