1  /* rc6 (TM)


2  * Unoptimized sample implementation of Ron Rivest's submission to the


3  * AES bakeoff.


4  *


5  * Salvo Salasio, 19 June 1998


6  *


7  * Intellectual property notes: The name of the algorithm (RC6) is


8  * trademarked; any property rights to the algorithm or the trademark


9  * should be discussed with discussed with the authors of the defining


10  * paper "The RC6(TM) Block Cipher": Ronald L. Rivest (MIT),


11  * M.J.B. Robshaw (RSA Labs), R. Sidney (RSA Labs), and Y.L. Yin (RSA Labs),


12  * distributed 18 June 1998 and available from the lead author's web site.


13  *


14  * This sample implementation is placed in the public domain by the author,


15  * Salvo Salasio. The ROTL and ROTR definitions were cribbed from RSA Labs'


16  * RC5 reference implementation.


17  */


18 


19  /* RC6 is parameterized for wbit words, b bytes of key, and


20  * r rounds. The AES version of RC6 specifies b=16, 24, or 32;


21  * w=32; and r=20.


22  */


23 


24  #define rc6keylen 43


25 


26  typedef unsigned int RC6KEY[rc6keylen];


27 


28  /*


29  * K=plain key


30  * b=plain key len


31  * S=prepared key by setup


32  * pt=uncrypted data


33  * ct=crypted data


34  * block size is always 16bytes


35  */


36  void rc6_key_setup(unsigned char *K, int b, unsigned int *S);


37  void rc6_block_encrypt(unsigned int *pt, unsigned int *ct, unsigned int *S);


38  void rc6_block_decrypt(unsigned int *ct, unsigned int *pt, unsigned int *S);


39 

