/*
* \file cast5.c
* \author Daniel Otte
- * \date 26.07.2006
+ * \email daniel.otte@rub.de
+ * \date 2006-07-26
* \par License:
- * GPL
+ * GPLv3 or later
* \brief Implementation of the CAST5 (aka CAST-128) cipher algorithm as described in RFC 2144
*
*/
-/**
- * \brief sets up round keys (context) for cast5 en/decryption.
- * @param s Pointer to cast5 context.
- * @param key Pointer to binary key.
- * @param keylength length of keydata in bits.
- */
-void cast5_init(cast5_ctx_t* s, uint8_t* key, uint8_t keylength){
+
+void cast5_init(void* key, uint8_t keylength_b, cast5_ctx_t* s){
/* we migth return if the key is valid and if setup was sucessfull */
uint32_t x[4], z[4];
#define BPX ((uint8_t*)&(x[0]))
#define BPZ ((uint8_t*)&(z[0]))
- s->shortkey = (keylength<=80);
+ s->shortkey = (keylength_b<=80);
/* littel endian only! */
memset(&(x[0]), 0 ,16); /* set x to zero */
- if(keylength > 128)
- keylength=128;
- memcpy(&(x[0]), key, (keylength+7)/8);
+ if(keylength_b > 128)
+ keylength_b=128;
+ memcpy(&(x[0]), key, (keylength_b+7)/8);
/* todo: merge a and b and compress the whole stuff */
/*************************************************************************/
-/**
- * \brief encrypts a datablock with cast5
- * @param s Pointer to cast5 roundkeys (context)
- * @param block Pointer to datablock
- */
-void cast5_enc(cast5_ctx_t *s, void* block){
+void cast5_enc(void* block, const cast5_ctx_t *s){
uint32_t l,r, x, y;
uint8_t i;
cast5_f_t* f[]={cast5_f1,cast5_f2,cast5_f3};
/*************************************************************************/
-/**
- * \brief decrypts a datablock with cast5
- * @param s Pointer to cast5 roundkeys (context)
- * @param block Pointer to datablock
- */
-void cast5_dec(cast5_ctx_t *s, void* block){
+void cast5_dec(void* block, const cast5_ctx_t *s){
uint32_t l,r, x, y;
int8_t i, rounds;
cast5_f_t* f[]={cast5_f1,cast5_f2,cast5_f3};