C++ to C# - Casting Unsigned Char[] to Unsigned Long[]

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C++

C#

Dear fellow devs,

I'm working on a task of converting some C++ code into C# . Unfortunately to be honest with you, I'm not very fluent with C++ so maybe I'm missing something simple.

Anyway, I have this unsigned char of 64 elements called buffer with the following elements:

[0] = 'C'
[1] = 'P'
[2] = '0'
[3] = '4'
...
[12] = '€'

The rest of the elements are all \0 (not '0').

Then this unsigned char array is cast to unsigned long array (within a class) as follows:

typedef struct _SHA_MSG {
    unsigned long W[80];
} sha1_key;

unsigned char buffer[64]={0};

buffer[0] = 'C';
buffer[1] = 'P';
buffer[2] = '0';
buffer[3] = 4 + '0';
buffer[12] = 0x80;

sha1_key* k = (sha1_key*)buffer;

However at this point, it changes drastically! For example k.W contains :

[0] = 875581507
[3] = 128
[16] = 3435973836
[17] = 2641335238
[18] = 3865956
[19] = 18366288
[20] = 0
[21] = 0
[22] = 2130567168
[23] = 3435973836

etc, with most elements having value 0 or 3435973836.

What has just happened? Can someone kindly instruct any C# equivalent of this operation that yields these results (ideally without relying on IntPtr) ?

Thanks a lot!

Edit:

My C# code of this part is:

struct sha1_key
{
    uint[] w;

    public uint[] W
    {
        get { return w; }
        set { w = value; }
    }
}

sha1_key key = new sha1_key();
key.W[0] = 'C';
key.W[1] = 'P';
key.W[2] = '0';
key.W[3] = (char)(year + '0');

key.W[12] = (char)0x80;

As you can see, I have so far retained much of the code as it is in C++. I will improve upon it later, when I manage to get it working :)