<div>
char input[48];<br />
char output[4];<br />
int i;<br />
<br />
for (i=0; i&lt;48; i+=4){<br />
output[0] ^= input[i];<br />
output[1]^=input[i+1];<br />
output[2]^=input[i+2];<br />
output[3]&quot;=input[i+3];<br />
};<br />
<br />
or did you want something fancier??<br />

</div>


char input[48];
char output[4];
int i;

for (i=0; i<48; i+=4){
output[0] ^= input[i];
output[1]^=input[i+1];
output[2]^=input[i+2];
output[3]"=input[i+3];
};

or did you want something fancier??


<div>
Thank you to provides those URLs<br />
I could not find them on search engins.<br />
Thanks to 3rsrichard, too bad it is not homework, his answer would have been a good start.
</div>


Thank you to provides those URLs
I could not find them on search engins.
Thanks to 3rsrichard, too bad it is not homework, his answer would have been a good start.

<div>
<div class="content wysiwyg-content">
In order to index an adress book, i am looking for a simple hash function.<br />
Say take a 48 byte names and make 4 bytes digest.
</div>
</div>


In order to index an adress book, i am looking for a simple hash function.
Say take a 48 byte names and make 4 bytes digest.

hash function wanted

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.