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C x86_64/gcm-hash8.asm
ifelse(`
Copyright (C) 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/.
')
C Register usage:
define(`KEY', `%rdi')
define(`XP', `%rsi')
define(`LENGTH', `%rdx')
define(`SRC', `%rcx')
define(`X0', `%rax')
define(`X1', `%rbx')
define(`CNT', `%ebp')
define(`T0', `%r8')
define(`T1', `%r9')
define(`T2', `%r10')
define(`Z0', `%r11')
define(`Z1', `%r12')
define(`SHIFT_TABLE', `%r13')
.file "gcm-hash8.asm"
C void gcm_hash (const struct gcm_key *key, union gcm_block *x,
C size_t length, const uint8_t *data)
.text
ALIGN(16)
PROLOGUE(_nettle_gcm_hash8)
W64_ENTRY(4, 0)
push %rbx
push %rbp
push %r12
push %r13
sub $16, LENGTH
lea .Lshift_table(%rip), SHIFT_TABLE
mov (XP), X0
mov 8(XP), X1
jc .Lfinal
ALIGN(16)
.Lblock_loop:
xor (SRC), X0
xor 8(SRC), X1
.Lblock_mul:
rol $8, X1
movzbl LREG(X1), XREG(T1)
shl $4, T1
mov (KEY, T1), Z0
mov 8(KEY, T1), Z1
C shift Z1, Z0, transforming
C +-----------------------+-----------------------+
C |15 14 13 12 11 10 09 08|07 06 05 04 03 02 01 00|
C +-----------------------+-----------------------+
C into
C +-----------------------+-----------------------+
C |14 13 12 11 10 09 08 07|06 05 04 03 02 01 00 |
C +-----------------------+-----------------+-----+
C xor |T[15]|
C +-----+
mov $7, CNT
ALIGN(16)
.Loop_X1:
mov Z1, T1
shr $56, T1
shl $8, Z1
mov Z0, T0
shl $8, Z0
shr $56, T0
movzwl (SHIFT_TABLE, T1, 2), XREG(T1)
xor T1, Z0
rol $8, X1
movzbl LREG(X1), XREG(T2)
shl $4, T2
xor (KEY, T2), Z0
add T0, Z1
xor 8(KEY, T2), Z1
decl CNT
jne .Loop_X1
mov $7, CNT
ALIGN(16)
.Loop_X0:
mov Z1, T1
shr $56, T1
shl $8, Z1
mov Z0, T0
shl $8, Z0
shr $56, T0
movzwl (SHIFT_TABLE, T1, 2), XREG(T1)
xor T1, Z0
rol $8, X0
movzbl LREG(X0), XREG(T2)
shl $4, T2
xor (KEY, T2), Z0
add T0, Z1
xor 8(KEY, T2), Z1
decl CNT
jne .Loop_X0
mov Z1, T1
shr $56, T1
shl $8, Z1
mov Z0, T0
shl $8, Z0
shr $56, T0
movzwl (SHIFT_TABLE, T1, 2), XREG(T1)
xor T1, Z0
rol $8, X0
movzbl LREG(X0), XREG(T2)
shl $4, T2
mov (KEY, T2), X0
xor Z0, X0
add T0, Z1
mov 8(KEY, T2), X1
xor Z1, X1
add $16, SRC
sub $16, LENGTH
jnc .Lblock_loop
.Lfinal:
add $16, LENGTH
jnz .Lpartial
mov X0, (XP)
mov X1, 8(XP)
pop %r13
pop %r12
pop %rbp
pop %rbx
W64_EXIT(4, 0)
ret
.Lpartial:
C Read and xor partial block, then jump back into the loop
C with LENGTH == 0.
cmp $8, LENGTH
jc .Llt8
C 8 <= LENGTH < 16
xor (SRC), X0
add $8, SRC
sub $8, LENGTH
jz .Lblock_mul
call .Lread_bytes
xor T0, X1
jmp .Lblock_mul
.Llt8: C 0 < LENGTH < 8
call .Lread_bytes
xor T0, X0
jmp .Lblock_mul
C Read 0 < LENGTH < 8 bytes at SRC, result in T0
.Lread_bytes:
xor T0, T0
sub $1, SRC
ALIGN(16)
.Lread_loop:
shl $8, T0
orb (SRC, LENGTH), LREG(T0)
.Lread_next:
sub $1, LENGTH
jnz .Lread_loop
ret
EPILOGUE(_nettle_gcm_hash8)
define(`W', `0x$2$1')
RODATA
ALIGN(2)
C NOTE: Sun/Oracle assembler doesn't support ".short".
C Using ".value" seems more portable.
.Lshift_table:
.value W(00,00),W(01,c2),W(03,84),W(02,46),W(07,08),W(06,ca),W(04,8c),W(05,4e)
.value W(0e,10),W(0f,d2),W(0d,94),W(0c,56),W(09,18),W(08,da),W(0a,9c),W(0b,5e)
.value W(1c,20),W(1d,e2),W(1f,a4),W(1e,66),W(1b,28),W(1a,ea),W(18,ac),W(19,6e)
.value W(12,30),W(13,f2),W(11,b4),W(10,76),W(15,38),W(14,fa),W(16,bc),W(17,7e)
.value W(38,40),W(39,82),W(3b,c4),W(3a,06),W(3f,48),W(3e,8a),W(3c,cc),W(3d,0e)
.value W(36,50),W(37,92),W(35,d4),W(34,16),W(31,58),W(30,9a),W(32,dc),W(33,1e)
.value W(24,60),W(25,a2),W(27,e4),W(26,26),W(23,68),W(22,aa),W(20,ec),W(21,2e)
.value W(2a,70),W(2b,b2),W(29,f4),W(28,36),W(2d,78),W(2c,ba),W(2e,fc),W(2f,3e)
.value W(70,80),W(71,42),W(73,04),W(72,c6),W(77,88),W(76,4a),W(74,0c),W(75,ce)
.value W(7e,90),W(7f,52),W(7d,14),W(7c,d6),W(79,98),W(78,5a),W(7a,1c),W(7b,de)
.value W(6c,a0),W(6d,62),W(6f,24),W(6e,e6),W(6b,a8),W(6a,6a),W(68,2c),W(69,ee)
.value W(62,b0),W(63,72),W(61,34),W(60,f6),W(65,b8),W(64,7a),W(66,3c),W(67,fe)
.value W(48,c0),W(49,02),W(4b,44),W(4a,86),W(4f,c8),W(4e,0a),W(4c,4c),W(4d,8e)
.value W(46,d0),W(47,12),W(45,54),W(44,96),W(41,d8),W(40,1a),W(42,5c),W(43,9e)
.value W(54,e0),W(55,22),W(57,64),W(56,a6),W(53,e8),W(52,2a),W(50,6c),W(51,ae)
.value W(5a,f0),W(5b,32),W(59,74),W(58,b6),W(5d,f8),W(5c,3a),W(5e,7c),W(5f,be)
.value W(e1,00),W(e0,c2),W(e2,84),W(e3,46),W(e6,08),W(e7,ca),W(e5,8c),W(e4,4e)
.value W(ef,10),W(ee,d2),W(ec,94),W(ed,56),W(e8,18),W(e9,da),W(eb,9c),W(ea,5e)
.value W(fd,20),W(fc,e2),W(fe,a4),W(ff,66),W(fa,28),W(fb,ea),W(f9,ac),W(f8,6e)
.value W(f3,30),W(f2,f2),W(f0,b4),W(f1,76),W(f4,38),W(f5,fa),W(f7,bc),W(f6,7e)
.value W(d9,40),W(d8,82),W(da,c4),W(db,06),W(de,48),W(df,8a),W(dd,cc),W(dc,0e)
.value W(d7,50),W(d6,92),W(d4,d4),W(d5,16),W(d0,58),W(d1,9a),W(d3,dc),W(d2,1e)
.value W(c5,60),W(c4,a2),W(c6,e4),W(c7,26),W(c2,68),W(c3,aa),W(c1,ec),W(c0,2e)
.value W(cb,70),W(ca,b2),W(c8,f4),W(c9,36),W(cc,78),W(cd,ba),W(cf,fc),W(ce,3e)
.value W(91,80),W(90,42),W(92,04),W(93,c6),W(96,88),W(97,4a),W(95,0c),W(94,ce)
.value W(9f,90),W(9e,52),W(9c,14),W(9d,d6),W(98,98),W(99,5a),W(9b,1c),W(9a,de)
.value W(8d,a0),W(8c,62),W(8e,24),W(8f,e6),W(8a,a8),W(8b,6a),W(89,2c),W(88,ee)
.value W(83,b0),W(82,72),W(80,34),W(81,f6),W(84,b8),W(85,7a),W(87,3c),W(86,fe)
.value W(a9,c0),W(a8,02),W(aa,44),W(ab,86),W(ae,c8),W(af,0a),W(ad,4c),W(ac,8e)
.value W(a7,d0),W(a6,12),W(a4,54),W(a5,96),W(a0,d8),W(a1,1a),W(a3,5c),W(a2,9e)
.value W(b5,e0),W(b4,22),W(b6,64),W(b7,a6),W(b2,e8),W(b3,2a),W(b1,6c),W(b0,ae)
.value W(bb,f0),W(ba,32),W(b8,74),W(b9,b6),W(bc,f8),W(bd,3a),W(bf,7c),W(be,be)
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