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|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Fast AES implementation for SPE instruction set (PPC)
*
* This code makes use of the SPE SIMD instruction set as defined in
* http://cache.freescale.com/files/32bit/doc/ref_manual/SPEPIM.pdf
* Implementation is based on optimization guide notes from
* http://cache.freescale.com/files/32bit/doc/app_note/AN2665.pdf
*
* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
*/
#include <asm/ppc_asm.h>
#include "aes-spe-regs.h"
#define EAD(in, bpos) \
rlwimi rT0,in,28-((bpos+3)%4)*8,20,27;
#define DAD(in, bpos) \
rlwimi rT1,in,24-((bpos+3)%4)*8,24,31;
#define LWH(out, off) \
evlwwsplat out,off(rT0); /* load word high */
#define LWL(out, off) \
lwz out,off(rT0); /* load word low */
#define LBZ(out, tab, off) \
lbz out,off(tab); /* load byte */
#define LAH(out, in, bpos, off) \
EAD(in, bpos) /* calc addr + load word high */ \
LWH(out, off)
#define LAL(out, in, bpos, off) \
EAD(in, bpos) /* calc addr + load word low */ \
LWL(out, off)
#define LAE(out, in, bpos) \
EAD(in, bpos) /* calc addr + load enc byte */ \
LBZ(out, rT0, 8)
#define LBE(out) \
LBZ(out, rT0, 8) /* load enc byte */
#define LAD(out, in, bpos) \
DAD(in, bpos) /* calc addr + load dec byte */ \
LBZ(out, rT1, 0)
#define LBD(out) \
LBZ(out, rT1, 0)
/*
* ppc_encrypt_block: The central encryption function for a single 16 bytes
* block. It does no stack handling or register saving to support fast calls
* via bl/blr. It expects that caller has pre-xored input data with first
* 4 words of encryption key into rD0-rD3. Pointer/counter registers must
* have also been set up before (rT0, rKP, CTR). Output is stored in rD0-rD3
* and rW0-rW3 and caller must execute a final xor on the output registers.
* All working registers rD0-rD3 & rW0-rW7 are overwritten during processing.
*
*/
_GLOBAL(ppc_encrypt_block)
LAH(rW4, rD1, 2, 4)
LAH(rW6, rD0, 3, 0)
LAH(rW3, rD0, 1, 8)
ppc_encrypt_block_loop:
LAH(rW0, rD3, 0, 12)
LAL(rW0, rD0, 0, 12)
LAH(rW1, rD1, 0, 12)
LAH(rW2, rD2, 1, 8)
LAL(rW2, rD3, 1, 8)
LAL(rW3, rD1, 1, 8)
LAL(rW4, rD2, 2, 4)
LAL(rW6, rD1, 3, 0)
LAH(rW5, rD3, 2, 4)
LAL(rW5, rD0, 2, 4)
LAH(rW7, rD2, 3, 0)
evldw rD1,16(rKP)
EAD(rD3, 3)
evxor rW2,rW2,rW4
LWL(rW7, 0)
evxor rW2,rW2,rW6
EAD(rD2, 0)
evxor rD1,rD1,rW2
LWL(rW1, 12)
evxor rD1,rD1,rW0
evldw rD3,24(rKP)
evmergehi rD0,rD0,rD1
EAD(rD1, 2)
evxor rW3,rW3,rW5
LWH(rW4, 4)
evxor rW3,rW3,rW7
EAD(rD0, 3)
evxor rD3,rD3,rW3
LWH(rW6, 0)
evxor rD3,rD3,rW1
EAD(rD0, 1)
evmergehi rD2,rD2,rD3
LWH(rW3, 8)
LAH(rW0, rD3, 0, 12)
LAL(rW0, rD0, 0, 12)
LAH(rW1, rD1, 0, 12)
LAH(rW2, rD2, 1, 8)
LAL(rW2, rD3, 1, 8)
LAL(rW3, rD1, 1, 8)
LAL(rW4, rD2, 2, 4)
LAL(rW6, rD1, 3, 0)
LAH(rW5, rD3, 2, 4)
LAL(rW5, rD0, 2, 4)
LAH(rW7, rD2, 3, 0)
evldw rD1,32(rKP)
EAD(rD3, 3)
evxor rW2,rW2,rW4
LWL(rW7, 0)
evxor rW2,rW2,rW6
EAD(rD2, 0)
evxor rD1,rD1,rW2
LWL(rW1, 12)
evxor rD1,rD1,rW0
evldw rD3,40(rKP)
evmergehi rD0,rD0,rD1
EAD(rD1, 2)
evxor rW3,rW3,rW5
LWH(rW4, 4)
evxor rW3,rW3,rW7
EAD(rD0, 3)
evxor rD3,rD3,rW3
LWH(rW6, 0)
evxor rD3,rD3,rW1
EAD(rD0, 1)
evmergehi rD2,rD2,rD3
LWH(rW3, 8)
addi rKP,rKP,32
bdnz ppc_encrypt_block_loop
LAH(rW0, rD3, 0, 12)
LAL(rW0, rD0, 0, 12)
LAH(rW1, rD1, 0, 12)
LAH(rW2, rD2, 1, 8)
LAL(rW2, rD3, 1, 8)
LAL(rW3, rD1, 1, 8)
LAL(rW4, rD2, 2, 4)
LAH(rW5, rD3, 2, 4)
LAL(rW6, rD1, 3, 0)
LAL(rW5, rD0, 2, 4)
LAH(rW7, rD2, 3, 0)
evldw rD1,16(rKP)
EAD(rD3, 3)
evxor rW2,rW2,rW4
LWL(rW7, 0)
evxor rW2,rW2,rW6
EAD(rD2, 0)
evxor rD1,rD1,rW2
LWL(rW1, 12)
evxor rD1,rD1,rW0
evldw rD3,24(rKP)
evmergehi rD0,rD0,rD1
EAD(rD1, 0)
evxor rW3,rW3,rW5
LBE(rW2)
evxor rW3,rW3,rW7
EAD(rD0, 1)
evxor rD3,rD3,rW3
LBE(rW6)
evxor rD3,rD3,rW1
EAD(rD0, 0)
evmergehi rD2,rD2,rD3
LBE(rW1)
LAE(rW0, rD3, 0)
LAE(rW1, rD0, 0)
LAE(rW4, rD2, 1)
LAE(rW5, rD3, 1)
LAE(rW3, rD2, 0)
LAE(rW7, rD1, 1)
rlwimi rW0,rW4,8,16,23
rlwimi rW1,rW5,8,16,23
LAE(rW4, rD1, 2)
LAE(rW5, rD2, 2)
rlwimi rW2,rW6,8,16,23
rlwimi rW3,rW7,8,16,23
LAE(rW6, rD3, 2)
LAE(rW7, rD0, 2)
rlwimi rW0,rW4,16,8,15
rlwimi rW1,rW5,16,8,15
LAE(rW4, rD0, 3)
LAE(rW5, rD1, 3)
rlwimi rW2,rW6,16,8,15
lwz rD0,32(rKP)
rlwimi rW3,rW7,16,8,15
lwz rD1,36(rKP)
LAE(rW6, rD2, 3)
LAE(rW7, rD3, 3)
rlwimi rW0,rW4,24,0,7
lwz rD2,40(rKP)
rlwimi rW1,rW5,24,0,7
lwz rD3,44(rKP)
rlwimi rW2,rW6,24,0,7
rlwimi rW3,rW7,24,0,7
blr
/*
* ppc_decrypt_block: The central decryption function for a single 16 bytes
* block. It does no stack handling or register saving to support fast calls
* via bl/blr. It expects that caller has pre-xored input data with first
* 4 words of encryption key into rD0-rD3. Pointer/counter registers must
* have also been set up before (rT0, rKP, CTR). Output is stored in rD0-rD3
* and rW0-rW3 and caller must execute a final xor on the output registers.
* All working registers rD0-rD3 & rW0-rW7 are overwritten during processing.
*
*/
_GLOBAL(ppc_decrypt_block)
LAH(rW0, rD1, 0, 12)
LAH(rW6, rD0, 3, 0)
LAH(rW3, rD0, 1, 8)
ppc_decrypt_block_loop:
LAH(rW1, rD3, 0, 12)
LAL(rW0, rD2, 0, 12)
LAH(rW2, rD2, 1, 8)
LAL(rW2, rD3, 1, 8)
LAH(rW4, rD3, 2, 4)
LAL(rW4, rD0, 2, 4)
LAL(rW6, rD1, 3, 0)
LAH(rW5, rD1, 2, 4)
LAH(rW7, rD2, 3, 0)
LAL(rW7, rD3, 3, 0)
LAL(rW3, rD1, 1, 8)
evldw rD1,16(rKP)
EAD(rD0, 0)
evxor rW4,rW4,rW6
LWL(rW1, 12)
evxor rW0,rW0,rW4
EAD(rD2, 2)
evxor rW0,rW0,rW2
LWL(rW5, 4)
evxor rD1,rD1,rW0
evldw rD3,24(rKP)
evmergehi rD0,rD0,rD1
EAD(rD1, 0)
evxor rW3,rW3,rW7
LWH(rW0, 12)
evxor rW3,rW3,rW1
EAD(rD0, 3)
evxor rD3,rD3,rW3
LWH(rW6, 0)
evxor rD3,rD3,rW5
EAD(rD0, 1)
evmergehi rD2,rD2,rD3
LWH(rW3, 8)
LAH(rW1, rD3, 0, 12)
LAL(rW0, rD2, 0, 12)
LAH(rW2, rD2, 1, 8)
LAL(rW2, rD3, 1, 8)
LAH(rW4, rD3, 2, 4)
LAL(rW4, rD0, 2, 4)
LAL(rW6, rD1, 3, 0)
LAH(rW5, rD1, 2, 4)
LAH(rW7, rD2, 3, 0)
LAL(rW7, rD3, 3, 0)
LAL(rW3, rD1, 1, 8)
evldw rD1,32(rKP)
EAD(rD0, 0)
evxor rW4,rW4,rW6
LWL(rW1, 12)
evxor rW0,rW0,rW4
EAD(rD2, 2)
evxor rW0,rW0,rW2
LWL(rW5, 4)
evxor rD1,rD1,rW0
evldw rD3,40(rKP)
evmergehi rD0,rD0,rD1
EAD(rD1, 0)
evxor rW3,rW3,rW7
LWH(rW0, 12)
evxor rW3,rW3,rW1
EAD(rD0, 3)
evxor rD3,rD3,rW3
LWH(rW6, 0)
evxor rD3,rD3,rW5
EAD(rD0, 1)
evmergehi rD2,rD2,rD3
LWH(rW3, 8)
addi rKP,rKP,32
bdnz ppc_decrypt_block_loop
LAH(rW1, rD3, 0, 12)
LAL(rW0, rD2, 0, 12)
LAH(rW2, rD2, 1, 8)
LAL(rW2, rD3, 1, 8)
LAH(rW4, rD3, 2, 4)
LAL(rW4, rD0, 2, 4)
LAL(rW6, rD1, 3, 0)
LAH(rW5, rD1, 2, 4)
LAH(rW7, rD2, 3, 0)
LAL(rW7, rD3, 3, 0)
LAL(rW3, rD1, 1, 8)
evldw rD1,16(rKP)
EAD(rD0, 0)
evxor rW4,rW4,rW6
LWL(rW1, 12)
evxor rW0,rW0,rW4
EAD(rD2, 2)
evxor rW0,rW0,rW2
LWL(rW5, 4)
evxor rD1,rD1,rW0
evldw rD3,24(rKP)
evmergehi rD0,rD0,rD1
DAD(rD1, 0)
evxor rW3,rW3,rW7
LBD(rW0)
evxor rW3,rW3,rW1
DAD(rD0, 1)
evxor rD3,rD3,rW3
LBD(rW6)
evxor rD3,rD3,rW5
DAD(rD0, 0)
evmergehi rD2,rD2,rD3
LBD(rW3)
LAD(rW2, rD3, 0)
LAD(rW1, rD2, 0)
LAD(rW4, rD2, 1)
LAD(rW5, rD3, 1)
LAD(rW7, rD1, 1)
rlwimi rW0,rW4,8,16,23
rlwimi rW1,rW5,8,16,23
LAD(rW4, rD3, 2)
LAD(rW5, rD0, 2)
rlwimi rW2,rW6,8,16,23
rlwimi rW3,rW7,8,16,23
LAD(rW6, rD1, 2)
LAD(rW7, rD2, 2)
rlwimi rW0,rW4,16,8,15
rlwimi rW1,rW5,16,8,15
LAD(rW4, rD0, 3)
LAD(rW5, rD1, 3)
rlwimi rW2,rW6,16,8,15
lwz rD0,32(rKP)
rlwimi rW3,rW7,16,8,15
lwz rD1,36(rKP)
LAD(rW6, rD2, 3)
LAD(rW7, rD3, 3)
rlwimi rW0,rW4,24,0,7
lwz rD2,40(rKP)
rlwimi rW1,rW5,24,0,7
lwz rD3,44(rKP)
rlwimi rW2,rW6,24,0,7
rlwimi rW3,rW7,24,0,7
blr
|
