/* SPDX-License-Identifier: GPL-2.0-or-later */
#
# This code is taken from CRYPTOGAMs[1] and is included here using the option
# in the license to distribute the code under the GPL. Therefore 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.
#
# [1] https://github.com/dot-asm/cryptogams/
# Copyright (c) 2006-2017, CRYPTOGAMS by <[email protected]>
# 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 copyright notices,
# 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 the CRYPTOGAMS nor the names of its
# copyright holder and contributors may be used to endorse or
# promote products derived from this software without specific
# prior written permission.
#
# ALTERNATIVELY, provided that this notice is retained in full, this
# product may be distributed under the terms of the GNU General Public
# License (GPL), in which case the provisions of the GPL apply INSTEAD OF
# those given above.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER 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.
# ====================================================================
# Written by Andy Polyakov <[email protected]> for the OpenSSL
# project. The module is, however, dual licensed under OpenSSL and
# CRYPTOGAMS licenses depending on where you obtain it. For further
# details see https://www.openssl.org/~appro/cryptogams/.
# ====================================================================
#
# ====================================================================
# Written and Modified by Danny Tsen <[email protected]>
# - Added x25519_fe51_sqr_times, x25519_fe51_frombytes, x25519_fe51_tobytes
# and x25519_cswap
#
# Copyright 2024- IBM Corp.
#
# X25519 lower-level primitives for PPC64.
#
#include <linux/linkage.h>
.text
.align 5
SYM_FUNC_START(x25519_fe51_mul)
stdu 1,-144(1)
std 21,56(1)
std 22,64(1)
std 23,72(1)
std 24,80(1)
std 25,88(1)
std 26,96(1)
std 27,104(1)
std 28,112(1)
std 29,120(1)
std 30,128(1)
std 31,136(1)
ld 6,0(5)
ld 7,0(4)
ld 8,8(4)
ld 9,16(4)
ld 10,24(4)
ld 11,32(4)
mulld 22,7,6
mulhdu 23,7,6
mulld 24,8,6
mulhdu 25,8,6
mulld 30,11,6
mulhdu 31,11,6
ld 4,8(5)
mulli 11,11,19
mulld 26,9,6
mulhdu 27,9,6
mulld 28,10,6
mulhdu 29,10,6
mulld 12,11,4
mulhdu 21,11,4
addc 22,22,12
adde 23,23,21
mulld 12,7,4
mulhdu 21,7,4
addc 24,24,12
adde 25,25,21
mulld 12,10,4
mulhdu 21,10,4
ld 6,16(5)
mulli 10,10,19
addc 30,30,12
adde 31,31,21
mulld 12,8,4
mulhdu 21,8,4
addc 26,26,12
adde 27,27,21
mulld 12,9,4
mulhdu 21,9,4
addc 28,28,12
adde 29,29,21
mulld 12,10,6
mulhdu 21,10,6
addc 22,22,12
adde 23,23,21
mulld 12,11,6
mulhdu 21,11,6
addc 24,24,12
adde 25,25,21
mulld 12,9,6
mulhdu 21,9,6
ld 4,24(5)
mulli 9,9,19
addc 30,30,12
adde 31,31,21
mulld 12,7,6
mulhdu 21,7,6
addc 26,26,12
adde 27,27,21
mulld 12,8,6
mulhdu 21,8,6
addc 28,28,12
adde 29,29,21
mulld 12,9,4
mulhdu 21,9,4
addc 22,22,12
adde 23,23,21
mulld 12,10,4
mulhdu 21,10,4
addc 24,24,12
adde 25,25,21
mulld 12,8,4
mulhdu 21,8,4
ld 6,32(5)
mulli 8,8,19
addc 30,30,12
adde 31,31,21
mulld 12,11,4
mulhdu 21,11,4
addc 26,26,12
adde 27,27,21
mulld 12,7,4
mulhdu 21,7,4
addc 28,28,12
adde 29,29,21
mulld 12,8,6
mulhdu 21,8,6
addc 22,22,12
adde 23,23,21
mulld 12,9,6
mulhdu 21,9,6
addc 24,24,12
adde 25,25,21
mulld 12,10,6
mulhdu 21,10,6
addc 26,26,12
adde 27,27,21
mulld 12,11,6
mulhdu 21,11,6
addc 28,28,12
adde 29,29,21
mulld 12,7,6
mulhdu 21,7,6
addc 30,30,12
adde 31,31,21
.Lfe51_reduce:
li 0,-1
srdi 0,0,13
srdi 12,26,51
and 9,26,0
insrdi 12,27,51,0
srdi 21,22,51
and 7,22,0
insrdi 21,23,51,0
addc 28,28,12
addze 29,29
addc 24,24,21
addze 25,25
srdi 12,28,51
and 10,28,0
insrdi 12,29,51,0
srdi 21,24,51
and 8,24,0
insrdi 21,25,51,0
addc 30,30,12
addze 31,31
add 9,9,21
srdi 12,30,51
and 11,30,0
insrdi 12,31,51,0
mulli 12,12,19
add 7,7,12
srdi 21,9,51
and 9,9,0
add 10,10,21
srdi 12,7,51
and 7,7,0
add 8,8,12
std 9,16(3)
std 10,24(3)
std 11,32(3)
std 7,0(3)
std 8,8(3)
ld 21,56(1)
ld 22,64(1)
ld 23,72(1)
ld 24,80(1)
ld 25,88(1)
ld 26,96(1)
ld 27,104(1)
ld 28,112(1)
ld 29,120(1)
ld 30,128(1)
ld 31,136(1)
addi 1,1,144
blr
SYM_FUNC_END(x25519_fe51_mul)
.align 5
SYM_FUNC_START(x25519_fe51_sqr)
stdu 1,-144(1)
std 21,56(1)
std 22,64(1)
std 23,72(1)
std 24,80(1)
std 25,88(1)
std 26,96(1)
std 27,104(1)
std 28,112(1)
std 29,120(1)
std 30,128(1)
std 31,136(1)
ld 7,0(4)
ld 8,8(4)
ld 9,16(4)
ld 10,24(4)
ld 11,32(4)
add 6,7,7
mulli 21,11,19
mulld 22,7,7
mulhdu 23,7,7
mulld 24,8,6
mulhdu 25,8,6
mulld 26,9,6
mulhdu 27,9,6
mulld 28,10,6
mulhdu 29,10,6
mulld 30,11,6
mulhdu 31,11,6
add 6,8,8
mulld 12,11,21
mulhdu 11,11,21
addc 28,28,12
adde 29,29,11
mulli 5,10,19
mulld 12,8,8
mulhdu 11,8,8
addc 26,26,12
adde 27,27,11
mulld 12,9,6
mulhdu 11,9,6
addc 28,28,12
adde 29,29,11
mulld 12,10,6
mulhdu 11,10,6
addc 30,30,12
adde 31,31,11
mulld 12,21,6
mulhdu 11,21,6
add 6,10,10
addc 22,22,12
adde 23,23,11
mulld 12,10,5
mulhdu 10,10,5
addc 24,24,12
adde 25,25,10
mulld 12,6,21
mulhdu 10,6,21
add 6,9,9
addc 26,26,12
adde 27,27,10
mulld 12,9,9
mulhdu 10,9,9
addc 30,30,12
adde 31,31,10
mulld 12,5,6
mulhdu 10,5,6
addc 22,22,12
adde 23,23,10
mulld 12,21,6
mulhdu 10,21,6
addc 24,24,12
adde 25,25,10
b .Lfe51_reduce
SYM_FUNC_END(x25519_fe51_sqr)
.align 5
SYM_FUNC_START(x25519_fe51_mul121666)
stdu 1,-144(1)
std 21,56(1)
std 22,64(1)
std 23,72(1)
std 24,80(1)
std 25,88(1)
std 26,96(1)
std 27,104(1)
std 28,112(1)
std 29,120(1)
std 30,128(1)
std 31,136(1)
lis 6,1
ori 6,6,56130
ld 7,0(4)
ld 8,8(4)
ld 9,16(4)
ld 10,24(4)
ld 11,32(4)
mulld 22,7,6
mulhdu 23,7,6
mulld 24,8,6
mulhdu 25,8,6
mulld 26,9,6
mulhdu 27,9,6
mulld 28,10,6
mulhdu 29,10,6
mulld 30,11,6
mulhdu 31,11,6
b .Lfe51_reduce
SYM_FUNC_END(x25519_fe51_mul121666)
.align 5
SYM_FUNC_START(x25519_fe51_sqr_times)
stdu 1,-144(1)
std 21,56(1)
std 22,64(1)
std 23,72(1)
std 24,80(1)
std 25,88(1)
std 26,96(1)
std 27,104(1)
std 28,112(1)
std 29,120(1)
std 30,128(1)
std 31,136(1)
ld 7,0(4)
ld 8,8(4)
ld 9,16(4)
ld 10,24(4)
ld 11,32(4)
mtctr 5
.Lsqr_times_loop:
add 6,7,7
mulli 21,11,19
mulld 22,7,7
mulhdu 23,7,7
mulld 24,8,6
mulhdu 25,8,6
mulld 26,9,6
mulhdu 27,9,6
mulld 28,10,6
mulhdu 29,10,6
mulld 30,11,6
mulhdu 31,11,6
add 6,8,8
mulld 12,11,21
mulhdu 11,11,21
addc 28,28,12
adde 29,29,11
mulli 5,10,19
mulld 12,8,8
mulhdu 11,8,8
addc 26,26,12
adde 27,27,11
mulld 12,9,6
mulhdu 11,9,6
addc 28,28,12
adde 29,29,11
mulld 12,10,6
mulhdu 11,10,6
addc 30,30,12
adde 31,31,11
mulld 12,21,6
mulhdu 11,21,6
add 6,10,10
addc 22,22,12
adde 23,23,11
mulld 12,10,5
mulhdu 10,10,5
addc 24,24,12
adde 25,25,10
mulld 12,6,21
mulhdu 10,6,21
add 6,9,9
addc 26,26,12
adde 27,27,10
mulld 12,9,9
mulhdu 10,9,9
addc 30,30,12
adde 31,31,10
mulld 12,5,6
mulhdu 10,5,6
addc 22,22,12
adde 23,23,10
mulld 12,21,6
mulhdu 10,21,6
addc 24,24,12
adde 25,25,10
# fe51_reduce
li 0,-1
srdi 0,0,13
srdi 12,26,51
and 9,26,0
insrdi 12,27,51,0
srdi 21,22,51
and 7,22,0
insrdi 21,23,51,0
addc 28,28,12
addze 29,29
addc 24,24,21
addze 25,25
srdi 12,28,51
and 10,28,0
insrdi 12,29,51,0
srdi 21,24,51
and 8,24,0
insrdi 21,25,51,0
addc 30,30,12
addze 31,31
add 9,9,21
srdi 12,30,51
and 11,30,0
insrdi 12,31,51,0
mulli 12,12,19
add 7,7,12
srdi 21,9,51
and 9,9,0
add 10,10,21
srdi 12,7,51
and 7,7,0
add 8,8,12
bdnz .Lsqr_times_loop
std 9,16(3)
std 10,24(3)
std 11,32(3)
std 7,0(3)
std 8,8(3)
ld 21,56(1)
ld 22,64(1)
ld 23,72(1)
ld 24,80(1)
ld 25,88(1)
ld 26,96(1)
ld 27,104(1)
ld 28,112(1)
ld 29,120(1)
ld 30,128(1)
ld 31,136(1)
addi 1,1,144
blr
SYM_FUNC_END(x25519_fe51_sqr_times)
.align 5
SYM_FUNC_START(x25519_fe51_frombytes)
li 12, -1
srdi 12, 12, 13 # 0x7ffffffffffff
ld 5, 0(4)
ld 6, 8(4)
ld 7, 16(4)
ld 8, 24(4)
srdi 10, 5, 51
and 5, 5, 12 # h0
sldi 11, 6, 13
or 11, 10, 11 # h1t
srdi 10, 6, 38
and 6, 11, 12 # h1
sldi 11, 7, 26
or 10, 10, 11 # h2t
srdi 11, 7, 25
and 7, 10, 12 # h2
sldi 10, 8, 39
or 11, 11, 10 # h3t
srdi 9, 8, 12
and 8, 11, 12 # h3
and 9, 9, 12 # h4
std 5, 0(3)
std 6, 8(3)
std 7, 16(3)
std 8, 24(3)
std 9, 32(3)
blr
SYM_FUNC_END(x25519_fe51_frombytes)
.align 5
SYM_FUNC_START(x25519_fe51_tobytes)
ld 5, 0(4)
ld 6, 8(4)
ld 7, 16(4)
ld 8, 24(4)
ld 9, 32(4)
li 12, -1
srdi 12, 12, 13 # 0x7ffffffffffff
# Full reducuction
addi 10, 5, 19
srdi 10, 10, 51
add 10, 10, 6
srdi 10, 10, 51
add 10, 10, 7
srdi 10, 10, 51
add 10, 10, 8
srdi 10, 10, 51
add 10, 10, 9
srdi 10, 10, 51
mulli 10, 10, 19
add 5, 5, 10
srdi 11, 5, 51
add 6, 6, 11
srdi 11, 6, 51
add 7, 7, 11
srdi 11, 7, 51
add 8, 8, 11
srdi 11, 8, 51
add 9, 9, 11
and 5, 5, 12
and 6, 6, 12
and 7, 7, 12
and 8, 8, 12
and 9, 9, 12
sldi 10, 6, 51
or 5, 5, 10 # s0
srdi 11, 6, 13
sldi 10, 7, 38
or 6, 11, 10 # s1
srdi 11, 7, 26
sldi 10, 8, 25
or 7, 11, 10 # s2
srdi 11, 8, 39
sldi 10, 9, 12
or 8, 11, 10 # s4
std 5, 0(3)
std 6, 8(3)
std 7, 16(3)
std 8, 24(3)
blr
SYM_FUNC_END(x25519_fe51_tobytes)
.align 5
SYM_FUNC_START(x25519_cswap)
li 7, 5
neg 6, 5
mtctr 7
.Lswap_loop:
ld 8, 0(3)
ld 9, 0(4)
xor 10, 8, 9
and 10, 10, 6
xor 11, 8, 10
xor 12, 9, 10
std 11, 0(3)
addi 3, 3, 8
std 12, 0(4)
addi 4, 4, 8
bdnz .Lswap_loop
blr
SYM_FUNC_END(x25519_cswap)
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