Convert hex string to binary data MD5

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SQL-Server-2005

C++

SQL-Server

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Hello!
I am making an MD5 application to hash the passwords in my database.
I successfully hashed the passwords into a Pwd_hash column in my table and it is of datatype char(32).
However, I have seen in some forums that it is best to keep the hash value in a binary(16) column.
Now, my problem is how do I convert the hex string to a binary value?

As a little example:

#include <iostream>
#include <string>
#include <bitset>
using namespace std;


int main()
{
	for(short int c = 0x1; c <= 0x3; c++)
	{
        bitset<((sizeof(short int) / 2 ) * 8)/2> binary(c); //sizeof() returns bytes, not bits!
        //cout << "Letter: " << c << "\t";
        cout << "Hex: " << hex << c << "\t";
        cout << "Binary: " << binary << endl;	
    }
	return 0;
}


</bitset></string></iostream>

However, the binary value returned is a 4-byte value, where each element takes up 1 byte.
What I want is for each pair of characters in the hex string, it is converted to the corresponding binary value.
e.g 0x82 will become binary(1000 0010) and not "1000 0010". The latter would imply 8 bytes and not 1 byte.
I hope I am making myself clear...