/*
- * File: cast5.c
- * Author: Daniel Otte
- * Date: 26.07.2006
- * License: GPL
- * Description: Implementation of the CAST5 (aka CAST-128) cipher algorithm as described in RFC 2144
+ * \file cast5.c
+ * \author Daniel Otte
+ * \date 26.07.2006
+ * \par License:
+ * GPL
+ * \brief Implementation of the CAST5 (aka CAST-128) cipher algorithm as described in RFC 2144
*
*/
- //pgm_read_dword
#include <stdint.h>
#include <string.h>
#include "cast5.h"
#include "config.h"
- #include "uart.h"
#include "debug.h"
#undef DEBUG
+ #ifdef DEBUG
+ #include "uart.h"
+ #endif
+
#include "cast5-sbox.h"
-
+/**
+ * \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){
/* we migth return if the key is valid and if setup was sucessfull */
uint32_t x[4], z[4];
#endif
}
+/*************************************************************************/
-
+/**
+ * \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){
uint32_t l,r, x, y;
uint8_t i;
((uint32_t*)block)[1]=l;
}
+/*************************************************************************/
+/**
+ * \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){
uint32_t l,r, x, y;
int8_t i, rounds;