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Is the user ID int chosen by the algorithm?<br />

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Is the user ID int chosen by the algorithm?


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I wish to generate registration codes for users of software.<br />
<br />
The users software has an embedded unique INT known by me<br />
say:<br />
int user = 12345678;<br />
<br />
Now I have a fixed key INT known only to me<br />
say:<br />
int key = 19673215;<br />
<br />
How would I write an algorithm to generate ascii passwords for the users to enter, (when emailed to them).<br />
<br />
And an algorithm within the program to check that the supplied password is valid for the unique user ID int.<br />
<br />
This not on UNIX so crypt is not an option and I want to do something a bit more exotic than XOR.<br />
<br />
Can anybody help??????<br />
Some workable C code examples only please<br />
<br />
<br />
<br />
<br />
<br />
<br />

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I wish to generate registration codes for users of software.

The users software has an embedded unique INT known by me
say:
int user = 12345678;

Now I have a fixed key INT known only to me
say:
int key = 19673215;

How would I write an algorithm to generate ascii passwords for the users to enter, (when emailed to them).

And an algorithm within the program to check that the supplied password is valid for the unique user ID int.

This not on UNIX so crypt is not an option and I want to do something a bit more exotic than XOR.

Can anybody help??????
Some workable C code examples only please








Mildly Cryptographic

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.