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C sparc32/aes-decrypt-internal.asm
ifelse(`
Copyright (C) 2002, 2005, 2013 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle 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 copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
')
include_src(`sparc32/aes.m4')
C Arguments
define(`ROUNDS',`%i0')
define(`KEYS', `%i1')
define(`T', `%i2')
define(`LENGTH',`%i3')
define(`DST', `%i4')
define(`SRC', `%i5')
C AES state, two copies for unrolling
define(`W0', `%l0')
define(`W1', `%l1')
define(`W2', `%l2')
define(`W3', `%l3')
define(`X0', `%l4')
define(`X1', `%l5')
define(`X2', `%l6')
define(`X3', `%l7')
C %o0-%03 are used for loop invariants T0-T3
define(`KEY', `%o4')
define(`COUNT', `%o5')
C %g1, %g2, %g3 are TMP1, TMP2 and TMP3
C The sparc32 stack frame looks like
C
C %fp - 4: OS-dependent link field
C %fp - 8: OS-dependent link field
C %fp - 104: OS register save area.
define(`FRAME_SIZE', 104)
.file "aes-decrypt-internal.asm"
C _aes_decrypt(unsigned rounds, const uint32_t *keys,
C const struct aes_table *T,
C size_t length, uint8_t *dst,
C uint8_t *src)
.section ".text"
.align 16
.proc 020
PROLOGUE(_nettle_aes_decrypt)
save %sp, -FRAME_SIZE, %sp
cmp LENGTH, 0
be .Lend
C Loop invariants
add T, AES_TABLE0, T0
add T, AES_TABLE1, T1
add T, AES_TABLE2, T2
add T, AES_TABLE3, T3
C Must be even, and includes the final round
srl ROUNDS, 1, ROUNDS
C Last two rounds handled specially
sub ROUNDS, 1, ROUNDS
.Lblock_loop:
C Read src, and add initial subkey
mov KEYS, KEY
AES_LOAD(0, SRC, KEY, W0)
AES_LOAD(1, SRC, KEY, W1)
AES_LOAD(2, SRC, KEY, W2)
AES_LOAD(3, SRC, KEY, W3)
mov ROUNDS, COUNT
add SRC, 16, SRC
add KEY, 16, KEY
.Lround_loop:
C The AES_ROUND macro uses T0,... T3
C Transform W -> X
AES_ROUND(0, W0, W3, W2, W1, KEY, X0)
AES_ROUND(1, W1, W0, W3, W2, KEY, X1)
AES_ROUND(2, W2, W1, W0, W3, KEY, X2)
AES_ROUND(3, W3, W2, W1, W0, KEY, X3)
C Transform X -> W
AES_ROUND(4, X0, X3, X2, X1, KEY, W0)
AES_ROUND(5, X1, X0, X3, X2, KEY, W1)
AES_ROUND(6, X2, X1, X0, X3, KEY, W2)
AES_ROUND(7, X3, X2, X1, X0, KEY, W3)
subcc COUNT, 1, COUNT
bne .Lround_loop
add KEY, 32, KEY
C Penultimate round
AES_ROUND(0, W0, W3, W2, W1, KEY, X0)
AES_ROUND(1, W1, W0, W3, W2, KEY, X1)
AES_ROUND(2, W2, W1, W0, W3, KEY, X2)
AES_ROUND(3, W3, W2, W1, W0, KEY, X3)
add KEY, 16, KEY
C Final round
AES_FINAL_ROUND(0, T, X0, X3, X2, X1, KEY, DST)
AES_FINAL_ROUND(1, T, X1, X0, X3, X2, KEY, DST)
AES_FINAL_ROUND(2, T, X2, X1, X0, X3, KEY, DST)
AES_FINAL_ROUND(3, T, X3, X2, X1, X0, KEY, DST)
subcc LENGTH, 16, LENGTH
bne .Lblock_loop
add DST, 16, DST
.Lend:
ret
restore
EPILOGUE(_nettle_aes_decrypt)
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