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MD5 now completly in ASM

This commit is contained in:
bg 2008-12-05 15:09:16 +00:00
parent a397db40b9
commit d5e2587658
3 changed files with 64 additions and 47 deletions
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64
md5-asm.S
View File

@ -785,7 +785,7 @@ md5_lastBlock:
movw r16, r20 /* length_b */
movw r14, r22 /* block_ptr */
movw r12, r24 /* state_ptr */
2:
cpi r17, 2 /* hi8(512) */
brlo 2f
1:
@ -796,7 +796,7 @@ md5_lastBlock:
add r14, r18
adc r15, r1
subi r17, 2
brge 1b
rjmp 2b
2:
pop r31
pop r30
@ -911,5 +911,65 @@ md5_lastBlock_exit:
ret
;###############################################################################
.global md5_ctx2hash
md5_ctx2hash:
movw r26, r24
movw r30, r22
ldi r22, 16
1:
ld r0, Z+
st X+, r0
dec r22
brne 1b
ret
;###############################################################################
.global md5
md5:
stack_alloc 20
push_range 8, 17
adiw r30, 1
movw r8, r30 /* ctx */
movw r10, r24 /* dest */
movw r12, r22 /* msg */
movw r14, r18 /* length (low) */
movw r16, r20 /* length (high) */
movw r24, r30
rcall md5_init
1:
tst r16
brne next_round
tst r17
breq last_round
next_round:
movw r24, r8
movw r22, r12
rcall md5_nextBlock
ldi r22, 64
add r12, r22
adc r13, r1
ldi r22, 2
sub r15, r22
sbci r16, 0
sbci r17, 0
rjmp 1b
last_round:
movw r24, r8
movw r22, r12
movw r20, r14
rcall md5_lastBlock
movw r24, r10
movw r22, r8
rcall md5_ctx2hash
pop_range 8, 17
stack_free 20
ret

43
md5-stub.c
View File

@ -1,43 +0,0 @@
/* md5-asm.c */
/*
This file is part of the Crypto-avr-lib/microcrypt-lib.
Copyright (C) 2008 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/>.
*/
#include "md5.h"
#include "uart.h"
#include <stdint.h>
#include <string.h>
#undef DEBUG
void md5_ctx2hash(md5_hash_t* dest, const md5_ctx_t* state){
memcpy(dest, state->a, MD5_HASH_BYTES);
}
void md5(md5_hash_t* dest, const void* msg, uint32_t length_b){
md5_ctx_t ctx;
md5_init(&ctx);
while(length_b>=MD5_BLOCK_BITS){
md5_nextBlock(&ctx, msg);
msg = (uint8_t*)msg + MD5_BLOCK_BYTES;
length_b -= MD5_BLOCK_BITS;
}
md5_lastBlock(&ctx, msg, length_b);
md5_ctx2hash(dest, &ctx);
}

4
mkfiles/md5_asm.mk
View File

@ -4,9 +4,9 @@ ALGO_NAME := MD5_ASM
# comment out the following line for removement of MD5 from the build process
HASHES += $(ALGO_NAME)
$(ALGO_NAME)_OBJ := md5-asm.o md5-stub.o
$(ALGO_NAME)_OBJ := md5-asm.o
$(ALGO_NAME)_TEST_BIN := main-md5-test.o debug.o uart.o serial-tools.o \
nessie_hash_test.o nessie_common.o cli.o performance_test.o
$(ALGO_NAME)_NESSIE_TEST := "nessie"
$(ALGO_NAME)_PEROFRMANCE_TEST := "performance"
$(ALGO_NAME)_PERFORMANCE_TEST := "performance"