I learned the bitwise operations in c, but i still cann't figure out how to shuffle the bits of the plain text accoring to DES's standard. Even with the key and the S-boxes. If someone could explain to me how DES is performed in C step by step.
P.S: I have a fair knowledge in C.
O_o
The algorithm is language agnostic. The algorithm is performed the same in every language.
You are asking for code. We don't do that. Post your code from what you've tried, or you may feel free to search the web for code.
Soma
“Salem Was Wrong!” -- Pedant Necromancer
“Four isn't random!” -- Gibbering Mouther
I am not asking for C code for the algorithm, i am just asking for an explanation in terms of C. . For example if the user enters the plaintext (64-bit), how am i supposed to know which are the lowest 8-bits, and then how can i perform the initial permutation, i.e how can i shuffle the bits in the way DES does.
I'd start by looking into the following:
Mask (computing) - Wikipedia, the free encyclopedia
FAQ > Bit shifting and bitwise operations - Cprogramming.com
