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/**********************************************************************
Copyright(c) 2021 Arm Corporation All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of Arm Corporation nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**********************************************************************/
#define KEY_LEN 256
#include "gcm_common.S"
declare_var_vector_reg Key11,27
declare_var_vector_reg Key12,28
declare_var_vector_reg Key13,29
declare_var_vector_reg Key14,30
#define KEY_REGS 0,1,2,3,4,5,6,7,8,9,10,11,12
.macro aes_encrypt_block block:req
aes_encrypt_round \block,Key0
aes_encrypt_round \block,Key1
aes_encrypt_round \block,Key2
aes_encrypt_round \block,Key3
aes_encrypt_round \block,Key4
aes_encrypt_round \block,Key5
aes_encrypt_round \block,Key6
aes_encrypt_round \block,Key7
aes_encrypt_round \block,Key8
aes_encrypt_round \block,Key9
aes_encrypt_round \block,Key10
aes_encrypt_round \block,Key11
aes_encrypt_round \block,Key12
aese v\block\().16b,vKey13.16b
eor v\block\().16b,v\block\().16b,vKey14.16b
.endm
/*
Load Aes Keys to [vKey0..vKey8,vKeyLast0,vKeyLast1]
*/
.macro load_aes_keys key_addr:req
ld1 { vKey0.4s- vKey3.4s},[\key_addr],64
ld1 { vKey4.4s- vKey7.4s},[\key_addr],64
ld1 { vKey8.4s- vKey11.4s},[\key_addr],64
ld1 {vKey12.4s- vKey14.4s},[\key_addr],48
.endm
/*
[low,middle,tmp0,high] +=aadhash * [hashkey0,hashkey0_ext]
dat=*dat_adr
enc_dat=aes_encrypt(ctr)^dat
aadhash=rbit(enc_dat)
[hashkey0,hashkey0_ext] = *hashkey_adr
dat_adr+=16
hashkey_adr+=32
*/
.macro aes_gcm_middle is_enc:req,aadhash:req,dat_adr:req,hashkey_adr:req, \
hashkey0:req,hashkey0_ext:req,high:req,low:req, \
ctr:req,enc_ctr:req,one:req,out_adr:req, \
tmp0:req,tmp1:req,left_count:req
pmull2 v\tmp0\().1q,v\aadhash\().2d,v\hashkey0\().2d
pmull v\tmp1\().1q,v\aadhash\().1d,v\hashkey0\().1d
.if \left_count > 1
ldr q\hashkey0,[\hashkey_adr],16
.endif
add v\ctr\().4s,v\ctr\().4s,v\one\().4s //increase ctr
rev32 v\enc_ctr\().16b,v\ctr\().16b
aes_encrypt_round \enc_ctr,Key0
eor v\high\().16b,v\high\().16b,v\tmp0\().16b
pmull v\tmp0\().1q,v\aadhash\().1d,v\hashkey0_ext\().1d
eor v\low\().16b,v\low\().16b,v\tmp1\().16b
pmull2 v\tmp1\().1q,v\aadhash\().2d,v\hashkey0_ext\().2d
.if \left_count > 1
ldr q\hashkey0_ext,[\hashkey_adr],16
.endif
eor v\aadhash\().16b,v\aadhash\().16b,v\aadhash\().16b
aes_encrypt_round \enc_ctr,Key1
aes_encrypt_round \enc_ctr,Key2
eor v\tmp0\().16b,v\tmp1\().16b,v\tmp0\().16b
aes_encrypt_round \enc_ctr,Key3
ext v\tmp1\().16b,v\aadhash\().16b,v\tmp0\().16b,8
ext v\tmp0\().16b,v\tmp0\().16b,v\aadhash\().16b,8
aes_encrypt_round \enc_ctr,Key4
eor v\low\().16b,v\low\().16b,v\tmp1\().16b
eor v\high\().16b,v\high\().16b,v\tmp0\().16b
aes_encrypt_round \enc_ctr,Key5
ldr q\aadhash,[\dat_adr],16
aes_encrypt_round \enc_ctr,Key6
aes_encrypt_round \enc_ctr,Key7
aes_encrypt_round \enc_ctr,Key8
aes_encrypt_round \enc_ctr,Key9
aes_encrypt_round \enc_ctr,Key10
aes_encrypt_round \enc_ctr,Key11
aes_encrypt_round \enc_ctr,Key12
aese v\enc_ctr\().16b,vKey13.16b
eor v\enc_ctr\().16b,v\enc_ctr\().16b,vKey14.16b
eor v\enc_ctr\().16b,v\enc_ctr\().16b,v\aadhash\().16b
.ifc \is_enc , encrypt
rbit v\aadhash\().16b,v\enc_ctr\().16b
.endif
.ifc \is_enc , decrypt
rbit v\aadhash\().16b,v\aadhash\().16b
.endif
str q\enc_ctr,[\out_adr],16
.endm
.macro aes_gcm_init is_enc:req,aadhash:req,dat_adr:req,hashkey_adr:req, \
hashkey0:req,hashkey0_ext:req, high:req,low:req, \
ctr:req,enc_ctr:req,one:req,out_adr:req, \
tmp0:req,tmp1:req,left_count:req
ldr q\hashkey0,[\hashkey_adr],16
add v\ctr\().4s,v\ctr\().4s,v\one\().4s /*increase ctr */
rev32 v\enc_ctr\().16b,v\ctr\().16b
aes_encrypt_round \enc_ctr,Key0
ldr q\hashkey0_ext,[\hashkey_adr],16
aes_encrypt_round \enc_ctr,Key1
pmull2 v\high\().1q,v\aadhash\().2d,v\hashkey0\().2d
pmull v\low\().1q,v\aadhash\().1d,v\hashkey0\().1d
.if \left_count > 1
ldr q\hashkey0,[\hashkey_adr],16
.endif
aes_encrypt_round \enc_ctr,Key2
pmull v\tmp1\().1q,v\aadhash\().1d,v\hashkey0_ext\().1d
pmull2 v\tmp0\().1q,v\aadhash\().2d,v\hashkey0_ext\().2d
eor v\aadhash\().16b,v\aadhash\().16b,v\aadhash\().16b
.if \left_count > 1
ldr q\hashkey0_ext,[\hashkey_adr],16
.endif
aes_encrypt_round \enc_ctr,Key3
eor v\tmp0\().16b,v\tmp1\().16b,v\tmp0\().16b
aes_encrypt_round \enc_ctr,Key4
ext v\tmp1\().16b,v\aadhash\().16b,v\tmp0\().16b,8 /*low */
ext v\tmp0\().16b,v\tmp0\().16b,v\aadhash\().16b,8 /* high */
aes_encrypt_round \enc_ctr,Key5
eor v\low\().16b,v\low\().16b,v\tmp1\().16b
eor v\high\().16b,v\high\().16b,v\tmp0\().16b
aes_encrypt_round \enc_ctr,Key6
ldr q\aadhash,[\dat_adr],16
aes_encrypt_round \enc_ctr,Key7
aes_encrypt_round \enc_ctr,Key8
aes_encrypt_round \enc_ctr,Key9
aes_encrypt_round \enc_ctr,Key10
aes_encrypt_round \enc_ctr,Key11
aes_encrypt_round \enc_ctr,Key12
aese v\enc_ctr\().16b,vKey13.16b
eor v\enc_ctr\().16b,v\enc_ctr\().16b,vKey14.16b
eor v\enc_ctr\().16b,v\enc_ctr\().16b,v\aadhash\().16b
.ifc \is_enc , encrypt
rbit v\aadhash\().16b,v\enc_ctr\().16b
.endif
.ifc \is_enc , decrypt
rbit v\aadhash\().16b,v\aadhash\().16b
.endif
str q\enc_ctr,[\out_adr],16
.endm
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