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/*
* Blowfish Cipher Algorithm (x86_64)
*
* Copyright (C) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include <linux/linkage.h>
.file "blowfish-x86_64-asm.S"
.text
/* structure of crypto context */
#define p 0
#define s0 ((16 + 2) * 4)
#define s1 ((16 + 2 + (1 * 256)) * 4)
#define s2 ((16 + 2 + (2 * 256)) * 4)
#define s3 ((16 + 2 + (3 * 256)) * 4)
/* register macros */
#define CTX %rdi
#define RIO %rsi
#define RX0 %rax
#define RX1 %rbx
#define RX2 %rcx
#define RX3 %rdx
#define RX0d %eax
#define RX1d %ebx
#define RX2d %ecx
#define RX3d %edx
#define RX0bl %al
#define RX1bl %bl
#define RX2bl %cl
#define RX3bl %dl
#define RX0bh %ah
#define RX1bh %bh
#define RX2bh %ch
#define RX3bh %dh
#define RT0 %rbp
#define RT1 %rsi
#define RT2 %r8
#define RT3 %r9
#define RT0d %ebp
#define RT1d %esi
#define RT2d %r8d
#define RT3d %r9d
#define RKEY %r10
/***********************************************************************
* 1-way blowfish
***********************************************************************/
#define F() \
rorq $16, RX0; \
movzbl RX0bh, RT0d; \
movzbl RX0bl, RT1d; \
rolq $16, RX0; \
movl s0(CTX,RT0,4), RT0d; \
addl s1(CTX,RT1,4), RT0d; \
movzbl RX0bh, RT1d; \
movzbl RX0bl, RT2d; \
rolq $32, RX0; \
xorl s2(CTX,RT1,4), RT0d; \
addl s3(CTX,RT2,4), RT0d; \
xorq RT0, RX0;
#define add_roundkey_enc(n) \
xorq p+4*(n)(CTX), RX0;
#define round_enc(n) \
add_roundkey_enc(n); \
\
F(); \
F();
#define add_roundkey_dec(n) \
movq p+4*(n-1)(CTX), RT0; \
rorq $32, RT0; \
xorq RT0, RX0;
#define round_dec(n) \
add_roundkey_dec(n); \
\
F(); \
F(); \
#define read_block() \
movq (RIO), RX0; \
rorq $32, RX0; \
bswapq RX0;
#define write_block() \
bswapq RX0; \
movq RX0, (RIO);
#define xor_block() \
bswapq RX0; \
xorq RX0, (RIO);
ENTRY(__blowfish_enc_blk)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
* %rcx: bool, if true: xor output
*/
movq %rbp, %r11;
movq %rsi, %r10;
movq %rdx, RIO;
read_block();
round_enc(0);
round_enc(2);
round_enc(4);
round_enc(6);
round_enc(8);
round_enc(10);
round_enc(12);
round_enc(14);
add_roundkey_enc(16);
movq %r11, %rbp;
movq %r10, RIO;
test %cl, %cl;
jnz .L__enc_xor;
write_block();
ret;
.L__enc_xor:
xor_block();
ret;
ENDPROC(__blowfish_enc_blk)
ENTRY(blowfish_dec_blk)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
*/
movq %rbp, %r11;
movq %rsi, %r10;
movq %rdx, RIO;
read_block();
round_dec(17);
round_dec(15);
round_dec(13);
round_dec(11);
round_dec(9);
round_dec(7);
round_dec(5);
round_dec(3);
add_roundkey_dec(1);
movq %r10, RIO;
write_block();
movq %r11, %rbp;
ret;
ENDPROC(blowfish_dec_blk)
/**********************************************************************
4-way blowfish, four blocks parallel
**********************************************************************/
/* F() for 4-way. Slower when used alone/1-way, but faster when used
* parallel/4-way (tested on AMD Phenom II & Intel Xeon E7330).
*/
#define F4(x) \
movzbl x ## bh, RT1d; \
movzbl x ## bl, RT3d; \
rorq $16, x; \
movzbl x ## bh, RT0d; \
movzbl x ## bl, RT2d; \
rorq $16, x; \
movl s0(CTX,RT0,4), RT0d; \
addl s1(CTX,RT2,4), RT0d; \
xorl s2(CTX,RT1,4), RT0d; \
addl s3(CTX,RT3,4), RT0d; \
xorq RT0, x;
#define add_preloaded_roundkey4() \
xorq RKEY, RX0; \
xorq RKEY, RX1; \
xorq RKEY, RX2; \
xorq RKEY, RX3;
#define preload_roundkey_enc(n) \
movq p+4*(n)(CTX), RKEY;
#define add_roundkey_enc4(n) \
add_preloaded_roundkey4(); \
preload_roundkey_enc(n + 2);
#define round_enc4(n) \
add_roundkey_enc4(n); \
\
F4(RX0); \
F4(RX1); \
F4(RX2); \
F4(RX3); \
\
F4(RX0); \
F4(RX1); \
F4(RX2); \
F4(RX3);
#define preload_roundkey_dec(n) \
movq p+4*((n)-1)(CTX), RKEY; \
rorq $32, RKEY;
#define add_roundkey_dec4(n) \
add_preloaded_roundkey4(); \
preload_roundkey_dec(n - 2);
#define round_dec4(n) \
add_roundkey_dec4(n); \
\
F4(RX0); \
F4(RX1); \
F4(RX2); \
F4(RX3); \
\
F4(RX0); \
F4(RX1); \
F4(RX2); \
F4(RX3);
#define read_block4() \
movq (RIO), RX0; \
rorq $32, RX0; \
bswapq RX0; \
\
movq 8(RIO), RX1; \
rorq $32, RX1; \
bswapq RX1; \
\
movq 16(RIO), RX2; \
rorq $32, RX2; \
bswapq RX2; \
\
movq 24(RIO), RX3; \
rorq $32, RX3; \
bswapq RX3;
#define write_block4() \
bswapq RX0; \
movq RX0, (RIO); \
\
bswapq RX1; \
movq RX1, 8(RIO); \
\
bswapq RX2; \
movq RX2, 16(RIO); \
\
bswapq RX3; \
movq RX3, 24(RIO);
#define xor_block4() \
bswapq RX0; \
xorq RX0, (RIO); \
\
bswapq RX1; \
xorq RX1, 8(RIO); \
\
bswapq RX2; \
xorq RX2, 16(RIO); \
\
bswapq RX3; \
xorq RX3, 24(RIO);
ENTRY(__blowfish_enc_blk_4way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
* %rcx: bool, if true: xor output
*/
pushq %rbp;
pushq %rbx;
pushq %rcx;
preload_roundkey_enc(0);
movq %rsi, %r11;
movq %rdx, RIO;
read_block4();
round_enc4(0);
round_enc4(2);
round_enc4(4);
round_enc4(6);
round_enc4(8);
round_enc4(10);
round_enc4(12);
round_enc4(14);
add_preloaded_roundkey4();
popq %rbp;
movq %r11, RIO;
test %bpl, %bpl;
jnz .L__enc_xor4;
write_block4();
popq %rbx;
popq %rbp;
ret;
.L__enc_xor4:
xor_block4();
popq %rbx;
popq %rbp;
ret;
ENDPROC(__blowfish_enc_blk_4way)
ENTRY(blowfish_dec_blk_4way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
*/
pushq %rbp;
pushq %rbx;
preload_roundkey_dec(17);
movq %rsi, %r11;
movq %rdx, RIO;
read_block4();
round_dec4(17);
round_dec4(15);
round_dec4(13);
round_dec4(11);
round_dec4(9);
round_dec4(7);
round_dec4(5);
round_dec4(3);
add_preloaded_roundkey4();
movq %r11, RIO;
write_block4();
popq %rbx;
popq %rbp;
ret;
ENDPROC(blowfish_dec_blk_4way)
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