--- /dev/null
+/* threefish256_enc_asm.S */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2009 Daniel Otte (daniel.otte@rub.de)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+ * \author Daniel Otte
+ * \email daniel.otte@rub.de
+ * \date 2009-03-16
+ * \license GPLv3 or later
+ */
+
+#include "avr-asm-macros.S"
+
+/******************************************************************************/
+/*
+void permute_4(void* data){
+ uint64_t t;
+ t = X(1);
+ X(1) = X(3);
+ X(3) = t;
+}
+void add_key_4(void* data, const threefish256_ctx_t* ctx, uint8_t s){
+ X(0) -= ctx->k[(s+0)%5];
+ X(1) -= ctx->k[(s+1)%5] + ctx->t[s%3];
+ X(2) -= ctx->k[(s+2)%5] + ctx->t[(s+1)%3];
+ X(3) -= ctx->k[(s+3)%5] + 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 r1[8] = {0x62, 0x52, 0x43, 0x24, 0x54, 0x6a, 0x34, 0x70};
+ do{
+ if(i%4==0){
+ add_key_4(data, ctx, s);
+ --s;
+ }
+ permute_4(data);
+ threefish_invmix(data, r0[i%8]);
+ threefish_invmix((uint8_t*)data + 16, r1[i%8]);
+ ++i;
+ }while(i!=72);
+ add_key_4(data, ctx, s);
+}
+*/
+I = 2
+S = 3
+DATA0 = 4
+DATA1 = 5
+CTX0 = 6
+CTX1 = 7
+IDX0 = 8
+IDX1 = 9
+IDX2 = 10
+IDX3 = 11
+/*
+ * param data: r24:r25
+ * param ctx: r22:r23
+ */
+.global threefish256_dec
+threefish256_dec:
+ push r28
+ push r29
+ push_range 2, 17
+ movw DATA0, r24
+ movw CTX0, r22
+ clr I
+ ldi r26, 18
+ mov S, r26
+1:
+ mov r30, I
+ andi r30, 0x03
+ breq 2f
+ rjmp 4f
+2:
+ ldi r30, lo8(threefish256_slut5)
+ ldi r31, hi8(threefish256_slut5)
+ add r30, S
+ adc r31, r1
+ lpm IDX0, Z+
+ lpm IDX1, Z+
+ lpm IDX2, Z+
+ lpm IDX3, Z
+ movw r30, CTX0
+ movw r26, DATA0
+ add r30, IDX0
+ adc r31, r1
+ rcall sub_z_from_x8
+ movw r30, CTX0
+ add r30, IDX1
+ adc r31, r1
+ rcall sub_z_from_x8
+ movw r30, CTX0
+ add r30, IDX2
+ adc r31, r1
+ rcall sub_z_from_x8
+ movw r30, CTX0
+ add r30, IDX3
+ adc r31, r1
+ rcall sub_z_from_x8
+
+ /* now the remaining key */
+ sbiw r26, 3*8
+ ldi r30, lo8(threefish256_slut3)
+ ldi r31, hi8(threefish256_slut3)
+ add r30, S
+ adc r31, r1
+ lpm IDX0, Z+
+ lpm IDX1, Z
+ movw r30, CTX0
+ adiw r30, 5*8
+ movw IDX2, r30
+ add r30, IDX0
+ adc r31, r1
+ rcall sub_z_from_x8
+ movw r30, IDX2
+ add r30, IDX1
+ adc r31, r1
+ rcall sub_z_from_x8
+ ld r0, X
+ sub r0, S
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ adc r0, r1
+ st X+, r0
+ tst S
+ brne 3f
+exit:
+ pop_range 2, 17
+ pop r29
+ pop r28
+ ret
+3:
+ dec S
+4:
+ /* now the permutation */
+ movw r26, DATA0
+ adiw r26, 8
+ movw r30, r26
+ adiw r30, 16
+ ld IDX0, X
+ ld IDX1, Z
+ st X+, IDX1
+ st Z+, IDX0
+ ld IDX0, X
+ ld IDX1, Z
+ st X+, IDX1
+ st Z+, IDX0
+ ld IDX0, X
+ ld IDX1, Z
+ st X+, IDX1
+ st Z+, IDX0
+ ld IDX0, X
+ ld IDX1, Z
+ st X+, IDX1
+ st Z+, IDX0
+ ld IDX0, X
+ ld IDX1, Z
+ st X+, IDX1
+ st Z+, IDX0
+ ld IDX0, X
+ ld IDX1, Z
+ st X+, IDX1
+ st Z+, IDX0
+ ld IDX0, X
+ ld IDX1, Z
+ st X+, IDX1
+ st Z+, IDX0
+ ld IDX0, X
+ ld IDX1, Z
+ st X+, IDX1
+ st Z+, IDX0
+ /* call mix */
+ ldi r30, lo8(threefish256_rc0)
+ ldi r31, hi8(threefish256_rc0)
+ mov r26, I
+ andi r26, 0x07
+ add r30, r26
+ adc r31, r1
+ lpm r22, Z
+ adiw r30, 8
+ lpm IDX0, Z
+ movw r24, DATA0
+ call threefish_invmix_asm /* no rcall? */
+ movw r24, DATA0
+ adiw r24, 16
+ mov r22, IDX0
+ call threefish_invmix_asm /* no rcall? */
+ inc I
+ rjmp 1b
+
+threefish256_slut5:
+ .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 0x08, 0x10, 0x00, 0x08, 0x10, 0x00, 0x08
+
+threefish256_rc0: .byte 0x73, 0x13, 0x7b, 0x32, 0x72, 0x2b, 0x44, 0x1b
+threefish256_rc1: .byte 0x62, 0x52, 0x43, 0x24, 0x54, 0x6a, 0x34, 0x70
+
+sub_z_from_x8:
+ ld r0, Z+
+ ld r1, X
+ sub r1, r0
+ st X+, r1
+ ld r0, Z+
+ ld r1, X
+ sbc r1, r0
+ st X+, r1
+ ld r0, Z+
+ ld r1, X
+ sbc r1, r0
+ st X+, r1
+ ld r0, Z+
+ ld r1, X
+ sbc r1, r0
+ st X+, r1
+ ld r0, Z+
+ ld r1, X
+ sbc r1, r0
+ st X+, r1
+ ld r0, Z+
+ ld r1, X
+ sbc r1, r0
+ st X+, r1
+ ld r0, Z+
+ ld r1, X
+ sbc r1, r0
+ st X+, r1
+ ld r0, Z+
+ ld r1, X
+ sbc r1, r0
+ st X+, r1
+ clr r1
+ ret
+
+
+
+
+
+
+
+
+
+
projects / avr-crypto-lib.git / blobdiff