* \email daniel.otte@rub.de
* \date 2009-03-16
* \license GPLv3 or later
- */
+ */
#include "avr-asm-macros.S"
}
void threefish256_dec(void* data, const threefish256_ctx_t* ctx){
uint8_t i=0,s=18;
- uint8_t r0[8] = {0x73, 0x13, 0x7b, 0x32, 0x72, 0x2b, 0x44, 0x1b};
+ uint8_t r0[8] = {0x73, 0x13, 0x7b, 0x32, 0x72, 0x2b, 0x44, 0x1b};
uint8_t r1[8] = {0x62, 0x52, 0x43, 0x24, 0x54, 0x6a, 0x34, 0x70};
do{
if(i%4==0){
clr I
ldi r26, 18
mov S, r26
-1:
+1:
mov r30, I
andi r30, 0x03
breq 2f
add r30, IDX3
adc r31, r1
rcall sub_z_from_x8
-
+
/* now the remaining key */
sbiw r26, 3*8
ldi r30, lo8(threefish256_slut3)
pop_range 2, 17
pop r29
pop r28
- ret
+ ret
3:
- dec S
-4:
+ dec S
+4:
/* now the permutation */
movw r26, DATA0
adiw r26, 8
call threefish_invmix_asm /* no rcall? */
inc I
rjmp 1b
-
+
threefish256_slut5:
- .byte 0x00, 0x08, 0x10, 0x18, 0x20, 0x00, 0x08, 0x10
+ .byte 0x00, 0x08, 0x10, 0x18, 0x20, 0x00, 0x08, 0x10
.byte 0x18, 0x20, 0x00, 0x08, 0x10, 0x18, 0x20, 0x00
.byte 0x08, 0x10, 0x18, 0x20, 0x00, 0x08, 0x10
threefish256_slut3:
.byte 0x00, 0x08, 0x10, 0x00, 0x08, 0x10, 0x00, 0x08
- .byte 0x10, 0x00, 0x08, 0x10, 0x00, 0x08, 0x10, 0x00
+ .byte 0x10, 0x00, 0x08, 0x10, 0x00, 0x08, 0x10, 0x00
.byte 0x08, 0x10, 0x00, 0x08, 0x10, 0x00, 0x08
-
-threefish256_rc0: .byte 0x73, 0x13, 0x7b, 0x32, 0x72, 0x2b, 0x44, 0x1b
+/* old round constants
+threefish256_rc0: .byte 0x73, 0x13, 0x7b, 0x32, 0x72, 0x2b, 0x44, 0x1b
threefish256_rc1: .byte 0x62, 0x52, 0x43, 0x24, 0x54, 0x6a, 0x34, 0x70
+*/
+threefish256_rc0: .byte 0x40, 0x72, 0x6a, 0x31, 0x1b, 0x39, 0x64, 0x2a
+threefish256_rc1: .byte 0x40, 0x3a, 0x14, 0x41, 0x5b, 0x50, 0x71, 0x20
+
sub_z_from_x8:
ld r0, Z+
st X+, r1
clr r1
ret
-
-
-
+
+
+