Need help implementing TEA or XXTEA aglorithm in lite-c

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Need help implementing TEA or XXTEA aglorithm in lite-c #271129 06/11/09 12:28 06/11/09 12:28
Joined: Aug 2008 Posts: 133 Sweden, Stockholm E Enduriel OP Member
Enduriel OP Member E Joined: Aug 2008 Posts: 133 Sweden, Stockholm	Hello everyone, I am kinda stuck right now. I've tried the last couple of hours to implement this encryption algorithm in lite-c for encrypting STRING* declarations, but with not that much of a success. So here I am in need of help from the big guy out there XXTEA C code: http://en.wikipedia.org/wiki/XXTEA TEA C code: http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm I've tried typecasting STRING, char when passing them into the functions but all I got was either crashes or weird returned characters after decryption. Can someone point out what I am doing wrong? Since the algorithm code is already there in the wiki, there isn't really that much of work left to be done, but I can't seem to be get it to work Regards, Endu!

Re: Need help implementing TEA or XXTEA aglorithm in lite-c [Re: Enduriel] #271132 06/11/09 12:40 06/11/09 12:40
Joined: Nov 2007 Posts: 1,032 Croatia croman Serious User
croman Serious User Joined: Nov 2007 Posts: 1,032 Croatia	well, can we see your code? i mean, we cant help you much without seeing your code Ubi bene, ibi Patria.

Re: Need help implementing TEA or XXTEA aglorithm in lite-c [Re: croman] #271133 06/11/09 12:46 06/11/09 12:46
Joined: Aug 2008 Posts: 133 Sweden, Stockholm E Enduriel OP Member
Enduriel OP Member E Joined: Aug 2008 Posts: 133 Sweden, Stockholm	It's pretty straight forward. The algorithm from wiki and this: Code: typedef unsigned int uint32_t; //(for the TEA) str_cpy(plaintext,"Text to be encrypted"); str_cpy(key,"7813498"); returned = encrypt ((uint32_t)plaintext, (uint32_t)key); wait(-5); beep(); str_cpy (str_show, (STRING*)returned); //To show on screen Then the same method for decrypting it back with the algorithm from the wiki. This example is the TEA, not XXTEA. I've also added return(v); at the end of the TEA function so "returned" catches it. Last edited by Enduriel; 06/11/09 12:47.

Re: Need help implementing TEA or XXTEA aglorithm in lite-c [Re: Enduriel] #271141 06/11/09 13:52 06/11/09 13:52
Joined: May 2002 Posts: 7,441 ventilator Senior Expert
ventilator Senior Expert Joined: May 2002 Posts: 7,441	i have used it for the lite-c filepacker. maybe you can learn something from the source.