154 lines
2.7 KiB
ArmAsm
154 lines
2.7 KiB
ArmAsm
/* keccac-asm.S */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2012 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file keccak-asm.S
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* \email daniel.otte@rub.de
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* \author Daniel Otte
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* \date 2012-12-16
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* \license GPLv3 or later
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*
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*/
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.nolist
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#include "avr-asm-macros.S"
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.list
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/*
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void keccak_theta (uint64_t *a, uint64_t *b){
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// uint64_t b[5][5];
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for(i = 0; i < 5; ++i){
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b[i][0] = a[0][i] ^ a[1][i] ^ a[2][i] ^ a[3][i] ^ a[4][i];
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}
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}
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*/
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theta_2a:
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/*
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input:
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r24:r25 = a ; uint64_t a[5][5]
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X = b ; uint64_t *b
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output:
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a[0..4][0] ^= b
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r20 = 0
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r21 = XX
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r22 = XX
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r24:r25 += 8
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X += 8
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Z = r24:r25 + 7 + 4 * 40
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*/
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ldi r20, 8
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10:
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movw ZL, r24
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ld r21, X+
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.irp r, 0, 1, 2, 3, 4
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ld r22, Z
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eor r22, r21
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st Z, r22
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.if \r != 4
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adiw ZL, 40
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.endif
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.endr
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adiw r24, 1
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dec r20
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brne 10b
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ret
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.global keccak_theta
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keccak_theta:
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movw r30, r24 ; Z = a
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movw r26, r22 ; X = b
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ldi r19, 5
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10:
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ldi r20, 8
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20:
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ld r22, Z
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adiw ZL, 40
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ld r21, Z
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eor r22, r21
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adiw ZL, 40
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ld r21, Z
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eor r22, r21
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adiw ZL, 40
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ld r21, Z
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eor r22, r21
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adiw ZL, 40
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ld r21, Z
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eor r22, r21
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adiw r24, 1
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movw r30, r24
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st X+, r22
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dec r20
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brne 20b
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adiw XL, 8 * 4
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dec r19
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brne 10b
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/*
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for(i = 0; i < 5; ++i){
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for(j = 0; j < 5; ++j){
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a[j][i] ^= b[(4 + i) % 5][0];
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}
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}
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for(i = 0; i < 5; ++i){
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for(j = 0; j < 5; ++j){
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a[j][i] ^= rotate64_1bit_left(b[(i + 1) % 5][0]);
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}
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}
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*/
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sbiw XL, 5 * 8
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sbiw r24, 40
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/* a[0..4][0]{0..7} ^= b[4][0]{0..7} */
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rcall theta_2a
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/* a[0..4][1]{0..7} ^= b[0][0]{0..7} */
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subi XL, lo8(4 * 5 * 8 + 8)
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sbci XH, hi8(4 * 5 * 8 + 8)
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rcall theta_2a
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/* a[0..4][2]{0..7} ^= b[1][0]{0..7} */
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adiw XL, 4 * 8
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rcall theta_2a
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/* a[0..4][3]{0..7} ^= b[2][0]{0..7} */
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adiw XL, 4 * 8
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rcall theta_2a
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/* a[0..4][4]{0..7} ^= b[3][0]{0..7} */
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adiw XL, 4 * 8
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rcall theta_2a
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ret
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ldi r20, 8
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10:
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movw ZL, r24
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ld r21, X+
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.irp r, 0, 1, 2, 3, 4
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ld r22, Z
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eor r22, r21
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st Z, r22
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.if \r != 4
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adiw ZL, 40
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.endif
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.endr
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adiw r24, 1
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dec r20
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brne 10b
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ret
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