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C nettle, low-level cryptographics library
C
C Copyright (C) 2010, Niels Möller
C
C The nettle library is free software; you can redistribute it and/or modify
C it under the terms of the GNU Lesser General Public License as published by
C the Free Software Foundation; either version 2.1 of the License, or (at your
C option) any later version.
C
C The nettle library is distributed in the hope that it will be useful, but
C WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
C or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
C License for more details.
C
C You should have received a copy of the GNU Lesser General Public License
C along with the nettle library; see the file COPYING.LIB. If not, write to
C the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
C MA 02111-1301, USA.
C Performance, cycles per block
C
C Intel SU4100
C C asm
C Camellia-128 415 347
C Camellia-256 543 461
C Register usage:
define(<ROUNDS>, <%rdi>)
define(<KEYS>, <%rsi>)
define(<TABLE>, <%rdx>)
define(<LENGTH>, <%rcx>)
define(<DST>, <%r8>)
define(<SRC>, <%r9>)
C Camellia state
define(<I0>, <%rax>)
define(<I1>, <%rbx>) C callee-save
define(<KEY>, <%r13>) C callee-save
define(<TMP>, <%rbp>) C callee-save
define(<CNT>, <%r10>)
define(<IL>, <%r11>)
define(<IR>, <%r12>) C callee-save
define(<SP1110>, <(TABLE,$1,4)>)
define(<SP0222>, <1024(TABLE,$1,4)>)
define(<SP3033>, <2048(TABLE,$1,4)>)
define(<SP4404>, <3072(TABLE,$1,4)>)
C ROUND(x, y, key-offset)
define(<ROUND>, <
C Byte 0,1
movzbl LREG($1), XREG(TMP)
movl SP1110(TMP), XREG(IR)
movzbl HREG($1), XREG(TMP)
xorl SP4404(TMP), XREG(IR)
ror <$>32, $1
C Byte 4,5
movzbl LREG($1), XREG(TMP)
movl SP4404(TMP), XREG(IL)
movzbl HREG($1), XREG(TMP)
xorl SP3033(TMP), XREG(IL)
rol <$>16, $1
C Byte 2,3
movzbl LREG($1), XREG(TMP)
xorl SP3033(TMP), XREG(IR)
movzbl HREG($1), XREG(TMP)
xorl SP0222(TMP), XREG(IR)
ror <$>32, $1
C Byte 6,7
movzbl LREG($1), XREG(TMP)
xorl SP0222(TMP), XREG(IL)
movzbl HREG($1), XREG(TMP)
xorl SP1110(TMP), XREG(IL)
ror <$>16, $1
C 76543210
xorl XREG(IL), XREG(IR)
rorl <$>8, XREG(IL)
xorl XREG(IR), XREG(IL)
shl <$>32, IR
or IL, IR
xor $3(KEY), $2
xor IR, $2
>)
C FL(x, key-offset)
define(<FL>, <
mov $1, TMP
shr <$>32, TMP
andl $2 + 4(KEY), XREG(TMP)
roll <$>1, XREG(TMP)
C xorl XREG(TMP), XREG($1)
xor TMP, $1
movl $2(KEY), XREG(TMP)
orl XREG($1), XREG(TMP)
shl <$>32, TMP
xor TMP, $1
>)
C FLINV(x0, key-offset)
define(<FLINV>, <
movl $2(KEY), XREG(TMP)
orl XREG($1), XREG(TMP)
shl <$>32, TMP
xor TMP, $1
mov $1, TMP
shr <$>32, TMP
andl $2 + 4(KEY), XREG(TMP)
roll <$>1, XREG(TMP)
C xorl XREG(TMP), XREG($1)
xor TMP, $1
>)
.file "camellia-crypt-internal.asm"
C _camellia_crypt(unsigned rounds, const uint64_t *keys,
C const struct camellia_table *T,
C size_t length, uint8_t *dst,
C uint8_t *src)
.text
ALIGN(16)
PROLOGUE(_nettle_camellia_crypt)
W64_ENTRY(5, 0)
test LENGTH, LENGTH
jz .Lend
push %rbx
push %rbp
push %r12
push %r13
sub $8, ROUNDS
.Lblock_loop:
C Load data, note that we'll happily do unaligned loads
mov (SRC), I0
bswap I0
mov 8(SRC), I1
bswap I1
add $16, SRC
mov XREG(ROUNDS), XREG(CNT)
mov KEYS, KEY
C Whitening using first subkey
xor (KEY), I0
add $8, KEY
ROUND(I0, I1, 0)
ROUND(I1, I0, 8)
ROUND(I0, I1, 16)
ROUND(I1, I0, 24)
ROUND(I0, I1, 32)
ROUND(I1, I0, 40)
.Lround_loop:
add $64, KEY
FL(I0, -16)
FLINV(I1, -8)
ROUND(I0, I1, 0)
ROUND(I1, I0, 8)
ROUND(I0, I1, 16)
ROUND(I1, I0, 24)
ROUND(I0, I1, 32)
ROUND(I1, I0, 40)
sub $8, CNT
ja .Lround_loop
bswap I0
mov I0, 8(DST)
xor 48(KEY), I1
bswap I1
mov I1, (DST)
add $16, DST
sub $16, LENGTH
ja .Lblock_loop
pop %r13
pop %r12
pop %rbp
pop %rbx
.Lend:
W64_EXIT(5, 0)
ret
EPILOGUE(_nettle_camellia_crypt)
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