165 lines
3.5 KiB
ArmAsm
165 lines
3.5 KiB
ArmAsm
/*
|
|
* Accelerated GHASH implementation with Intel PCLMULQDQ-NI
|
|
* instructions. This file contains accelerated part of ghash
|
|
* implementation. More information about PCLMULQDQ can be found at:
|
|
*
|
|
* http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/
|
|
*
|
|
* Copyright (c) 2009 Intel Corp.
|
|
* Author: Huang Ying <ying.huang@intel.com>
|
|
* Vinodh Gopal
|
|
* Erdinc Ozturk
|
|
* Deniz Karakoyunlu
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/i387.h>
|
|
|
|
.align 16
|
|
.Lbswap_mask:
|
|
.octa 0x000102030405060708090a0b0c0d0e0f
|
|
.Lpoly:
|
|
.octa 0xc2000000000000000000000000000001
|
|
.Ltwo_one:
|
|
.octa 0x00000001000000000000000000000001
|
|
|
|
#define DATA %xmm0
|
|
#define SHASH %xmm1
|
|
#define T1 %xmm2
|
|
#define T2 %xmm3
|
|
#define T3 %xmm4
|
|
#define BSWAP %xmm5
|
|
#define IN1 %xmm6
|
|
|
|
.text
|
|
|
|
/*
|
|
* __clmul_gf128mul_ble: internal ABI
|
|
* input:
|
|
* DATA: operand1
|
|
* SHASH: operand2, hash_key << 1 mod poly
|
|
* output:
|
|
* DATA: operand1 * operand2 mod poly
|
|
* changed:
|
|
* T1
|
|
* T2
|
|
* T3
|
|
*/
|
|
__clmul_gf128mul_ble:
|
|
movaps DATA, T1
|
|
pshufd $0b01001110, DATA, T2
|
|
pshufd $0b01001110, SHASH, T3
|
|
pxor DATA, T2
|
|
pxor SHASH, T3
|
|
|
|
# pclmulqdq $0x00, SHASH, DATA # DATA = a0 * b0
|
|
.byte 0x66, 0x0f, 0x3a, 0x44, 0xc1, 0x00
|
|
# pclmulqdq $0x11, SHASH, T1 # T1 = a1 * b1
|
|
.byte 0x66, 0x0f, 0x3a, 0x44, 0xd1, 0x11
|
|
# pclmulqdq $0x00, T3, T2 # T2 = (a1 + a0) * (b1 + b0)
|
|
.byte 0x66, 0x0f, 0x3a, 0x44, 0xdc, 0x00
|
|
pxor DATA, T2
|
|
pxor T1, T2 # T2 = a0 * b1 + a1 * b0
|
|
|
|
movaps T2, T3
|
|
pslldq $8, T3
|
|
psrldq $8, T2
|
|
pxor T3, DATA
|
|
pxor T2, T1 # <T1:DATA> is result of
|
|
# carry-less multiplication
|
|
|
|
# first phase of the reduction
|
|
movaps DATA, T3
|
|
psllq $1, T3
|
|
pxor DATA, T3
|
|
psllq $5, T3
|
|
pxor DATA, T3
|
|
psllq $57, T3
|
|
movaps T3, T2
|
|
pslldq $8, T2
|
|
psrldq $8, T3
|
|
pxor T2, DATA
|
|
pxor T3, T1
|
|
|
|
# second phase of the reduction
|
|
movaps DATA, T2
|
|
psrlq $5, T2
|
|
pxor DATA, T2
|
|
psrlq $1, T2
|
|
pxor DATA, T2
|
|
psrlq $1, T2
|
|
pxor T2, T1
|
|
pxor T1, DATA
|
|
ret
|
|
|
|
/* void clmul_ghash_mul(char *dst, const be128 *shash) */
|
|
ENTRY(clmul_ghash_mul)
|
|
movups (%rdi), DATA
|
|
movups (%rsi), SHASH
|
|
movaps .Lbswap_mask, BSWAP
|
|
# pshufb BSWAP, DATA
|
|
PSHUFB_XMM5_XMM0
|
|
call __clmul_gf128mul_ble
|
|
# pshufb BSWAP, DATA
|
|
.byte 0x66, 0x0f, 0x38, 0x00, 0xc5
|
|
movups DATA, (%rdi)
|
|
ret
|
|
|
|
/*
|
|
* void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
|
|
* const be128 *shash);
|
|
*/
|
|
ENTRY(clmul_ghash_update)
|
|
cmp $16, %rdx
|
|
jb .Lupdate_just_ret # check length
|
|
movaps .Lbswap_mask, BSWAP
|
|
movups (%rdi), DATA
|
|
movups (%rcx), SHASH
|
|
# pshufb BSWAP, DATA
|
|
PSHUFB_XMM5_XMM0
|
|
.align 4
|
|
.Lupdate_loop:
|
|
movups (%rsi), IN1
|
|
# pshufb BSWAP, IN1
|
|
PSHUFB_XMM5_XMM6
|
|
pxor IN1, DATA
|
|
call __clmul_gf128mul_ble
|
|
sub $16, %rdx
|
|
add $16, %rsi
|
|
cmp $16, %rdx
|
|
jge .Lupdate_loop
|
|
# pshufb BSWAP, DATA
|
|
PSHUFB_XMM5_XMM0
|
|
movups DATA, (%rdi)
|
|
.Lupdate_just_ret:
|
|
ret
|
|
|
|
/*
|
|
* void clmul_ghash_setkey(be128 *shash, const u8 *key);
|
|
*
|
|
* Calculate hash_key << 1 mod poly
|
|
*/
|
|
ENTRY(clmul_ghash_setkey)
|
|
movaps .Lbswap_mask, BSWAP
|
|
movups (%rsi), %xmm0
|
|
# pshufb BSWAP, %xmm0
|
|
PSHUFB_XMM5_XMM0
|
|
movaps %xmm0, %xmm1
|
|
psllq $1, %xmm0
|
|
psrlq $63, %xmm1
|
|
movaps %xmm1, %xmm2
|
|
pslldq $8, %xmm1
|
|
psrldq $8, %xmm2
|
|
por %xmm1, %xmm0
|
|
# reduction
|
|
pshufd $0b00100100, %xmm2, %xmm1
|
|
pcmpeqd .Ltwo_one, %xmm1
|
|
pand .Lpoly, %xmm1
|
|
pxor %xmm1, %xmm0
|
|
movups %xmm0, (%rdi)
|
|
ret
|