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avr-crypto-lib
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adjustments made for host usage (but still not "endian-safe")

This commit is contained in:
bg 2008-08-24 04:57:08 +00:00
parent 6bd58d7909
commit c135a8edfc
1 changed files with 28 additions and 13 deletions
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41
noekeon.c
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@ -27,7 +27,10 @@
#include <stdint.h>
#include <string.h>
#include <avr/pgmspace.h>
#ifdef __AVR__
#include <avr/pgmspace.h>
#endif
#include "noekeon.h"
// #include "uart.h"
@ -67,7 +70,7 @@ void pi2(uint32_t* a){
}
static
void theta(uint32_t* k, uint32_t* a){
void theta(const uint32_t* k, uint32_t* a){
uint32_t temp;
temp = a[0] ^ a[2]; temp ^= ROTR32(temp, 8) ^ ROTL32(temp, 8);
@ -90,12 +93,16 @@ void noekeon_round(uint32_t* key, uint32_t* state, uint8_t const1, uint8_t const
((uint8_t*)state)[RC_POS] ^= const1;
theta(key, state);
((uint8_t*)state)[RC_POS] ^= const2;
pi1(state);
gamma(state);
pi2(state);
pi1(state);
}
uint8_t rc_tab[] PROGMEM = {
uint8_t rc_tab[]
#ifdef __AVR__
PROGMEM
#endif
= {
/* 0x80, */
0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A,
0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A,
@ -127,26 +134,31 @@ void changendian(void* a){
/******************************************************************************/
void noekeon_enc(void* buffer, void* key){
void noekeon_enc(void* buffer, const void* key){
uint8_t rc=0x80;
uint8_t keyb[16];
int8_t i;
memcpy(keyb, key, 16);
changendian(buffer);
changendian(key);
changendian(keyb);
for(i=0; i<ROUND_NR; ++i){
noekeon_round((uint32_t*)key, (uint32_t*)buffer, rc, 0);
noekeon_round((uint32_t*)keyb, (uint32_t*)buffer, rc, 0);
#ifdef __AVR__
rc = pgm_read_byte(rc_tab+i);
#else
rc = rc_tab[i];
#endif
}
((uint8_t*)buffer)[RC_POS] ^= rc;
theta((uint32_t*)key, (uint32_t*)buffer);
theta((uint32_t*)keyb, (uint32_t*)buffer);
changendian(buffer);
changendian(key);
}
void noekeon_dec(void* buffer, void* key){
void noekeon_dec(void* buffer, const void* key){
uint8_t rc;
int8_t i;
uint8_t nullv[16];
@ -154,27 +166,30 @@ void noekeon_dec(void* buffer, void* key){
changendian(buffer);
changendian(key);
memset(nullv, 0, 16);
memcpy(dkey, key, 16);
changendian(dkey);
theta((uint32_t*)nullv, (uint32_t*)dkey);
// uart_putstr_P(PSTR("\r\nTheta: "));
// uart_hexdump(dkey, 16);
for(i=ROUND_NR-1; i>=0; --i){
#ifdef __AVR__
rc = pgm_read_byte(rc_tab+i);
#else
rc = rc_tab[i];
#endif
noekeon_round((uint32_t*)dkey, (uint32_t*)buffer, 0, rc);
}
theta((uint32_t*)dkey, (uint32_t*)buffer);
((uint8_t*)buffer)[RC_POS] ^= 0x80;
changendian(buffer);
changendian(key);
}
void noekeon_init(void* key, noekeon_ctx_t* ctx){
void noekeon_init(const void* key, noekeon_ctx_t* ctx){
uint8_t nullv[16];
memset(nullv, 0, 16);