/* SPDX-License-Identifier: GPL-2.0-or-later */
#
# Accelerated poly1305 implementation for ppc64le.
#
# Copyright 2023- IBM Corp. All rights reserved
#
#===================================================================================
# Written by Danny Tsen <[email protected]>
#
# Poly1305 - this version mainly using vector/VSX/Scalar
# - 26 bits limbs
# - Handle multiple 64 byte blcok.
#
# Block size 16 bytes
# key = (r, s)
# clamp r &= 0x0FFFFFFC0FFFFFFC 0x0FFFFFFC0FFFFFFF
# p = 2^130 - 5
# a += m
# a = (r + a) % p
# a += s
#
# Improve performance by breaking down polynominal to the sum of products with
# h4 = m1 * r⁴ + m2 * r³ + m3 * r² + m4 * r
#
# 07/22/21 - this revison based on the above sum of products. Setup r^4, r^3, r^2, r and s3, s2, s1, s0
# to 9 vectors for multiplications.
#
# setup r^4, r^3, r^2, r vectors
# vs [r^1, r^3, r^2, r^4]
# vs0 = [r0,.....]
# vs1 = [r1,.....]
# vs2 = [r2,.....]
# vs3 = [r3,.....]
# vs4 = [r4,.....]
# vs5 = [r1*5,...]
# vs6 = [r2*5,...]
# vs7 = [r2*5,...]
# vs8 = [r4*5,...]
#
# Each word in a vector consists a member of a "r/s" in [a * r/s].
#
# r0, r4*5, r3*5, r2*5, r1*5;
# r1, r0, r4*5, r3*5, r2*5;
# r2, r1, r0, r4*5, r3*5;
# r3, r2, r1, r0, r4*5;
# r4, r3, r2, r1, r0 ;
#
#
# poly1305_p10le_4blocks( uint8_t *k, uint32_t mlen, uint8_t *m)
# k = 32 bytes key
# r3 = k (r, s)
# r4 = mlen
# r5 = m
#
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/asm-compat.h>
#include <linux/linkage.h>
.machine "any"
.text
.macro SAVE_GPR GPR OFFSET FRAME
std \GPR,\OFFSET(\FRAME)
.endm
.macro SAVE_VRS VRS OFFSET FRAME
li 16, \OFFSET
stvx \VRS, 16, \FRAME
.endm
.macro SAVE_VSX VSX OFFSET FRAME
li 16, \OFFSET
stxvx \VSX, 16, \FRAME
.endm
.macro RESTORE_GPR GPR OFFSET FRAME
ld \GPR,\OFFSET(\FRAME)
.endm
.macro RESTORE_VRS VRS OFFSET FRAME
li 16, \OFFSET
lvx \VRS, 16, \FRAME
.endm
.macro RESTORE_VSX VSX OFFSET FRAME
li 16, \OFFSET
lxvx \VSX, 16, \FRAME
.endm
.macro SAVE_REGS
mflr 0
std 0, 16(1)
stdu 1,-752(1)
SAVE_GPR 14, 112, 1
SAVE_GPR 15, 120, 1
SAVE_GPR 16, 128, 1
SAVE_GPR 17, 136, 1
SAVE_GPR 18, 144, 1
SAVE_GPR 19, 152, 1
SAVE_GPR 20, 160, 1
SAVE_GPR 21, 168, 1
SAVE_GPR 22, 176, 1
SAVE_GPR 23, 184, 1
SAVE_GPR 24, 192, 1
SAVE_GPR 25, 200, 1
SAVE_GPR 26, 208, 1
SAVE_GPR 27, 216, 1
SAVE_GPR 28, 224, 1
SAVE_GPR 29, 232, 1
SAVE_GPR 30, 240, 1
SAVE_GPR 31, 248, 1
addi 9, 1, 256
SAVE_VRS 20, 0, 9
SAVE_VRS 21, 16, 9
SAVE_VRS 22, 32, 9
SAVE_VRS 23, 48, 9
SAVE_VRS 24, 64, 9
SAVE_VRS 25, 80, 9
SAVE_VRS 26, 96, 9
SAVE_VRS 27, 112, 9
SAVE_VRS 28, 128, 9
SAVE_VRS 29, 144, 9
SAVE_VRS 30, 160, 9
SAVE_VRS 31, 176, 9
SAVE_VSX 14, 192, 9
SAVE_VSX 15, 208, 9
SAVE_VSX 16, 224, 9
SAVE_VSX 17, 240, 9
SAVE_VSX 18, 256, 9
SAVE_VSX 19, 272, 9
SAVE_VSX 20, 288, 9
SAVE_VSX 21, 304, 9
SAVE_VSX 22, 320, 9
SAVE_VSX 23, 336, 9
SAVE_VSX 24, 352, 9
SAVE_VSX 25, 368, 9
SAVE_VSX 26, 384, 9
SAVE_VSX 27, 400, 9
SAVE_VSX 28, 416, 9
SAVE_VSX 29, 432, 9
SAVE_VSX 30, 448, 9
SAVE_VSX 31, 464, 9
.endm # SAVE_REGS
.macro RESTORE_REGS
addi 9, 1, 256
RESTORE_VRS 20, 0, 9
RESTORE_VRS 21, 16, 9
RESTORE_VRS 22, 32, 9
RESTORE_VRS 23, 48, 9
RESTORE_VRS 24, 64, 9
RESTORE_VRS 25, 80, 9
RESTORE_VRS 26, 96, 9
RESTORE_VRS 27, 112, 9
RESTORE_VRS 28, 128, 9
RESTORE_VRS 29, 144, 9
RESTORE_VRS 30, 160, 9
RESTORE_VRS 31, 176, 9
RESTORE_VSX 14, 192, 9
RESTORE_VSX 15, 208, 9
RESTORE_VSX 16, 224, 9
RESTORE_VSX 17, 240, 9
RESTORE_VSX 18, 256, 9
RESTORE_VSX 19, 272, 9
RESTORE_VSX 20, 288, 9
RESTORE_VSX 21, 304, 9
RESTORE_VSX 22, 320, 9
RESTORE_VSX 23, 336, 9
RESTORE_VSX 24, 352, 9
RESTORE_VSX 25, 368, 9
RESTORE_VSX 26, 384, 9
RESTORE_VSX 27, 400, 9
RESTORE_VSX 28, 416, 9
RESTORE_VSX 29, 432, 9
RESTORE_VSX 30, 448, 9
RESTORE_VSX 31, 464, 9
RESTORE_GPR 14, 112, 1
RESTORE_GPR 15, 120, 1
RESTORE_GPR 16, 128, 1
RESTORE_GPR 17, 136, 1
RESTORE_GPR 18, 144, 1
RESTORE_GPR 19, 152, 1
RESTORE_GPR 20, 160, 1
RESTORE_GPR 21, 168, 1
RESTORE_GPR 22, 176, 1
RESTORE_GPR 23, 184, 1
RESTORE_GPR 24, 192, 1
RESTORE_GPR 25, 200, 1
RESTORE_GPR 26, 208, 1
RESTORE_GPR 27, 216, 1
RESTORE_GPR 28, 224, 1
RESTORE_GPR 29, 232, 1
RESTORE_GPR 30, 240, 1
RESTORE_GPR 31, 248, 1
addi 1, 1, 752
ld 0, 16(1)
mtlr 0
.endm # RESTORE_REGS
#
# p[0] = a0*r0 + a1*r4*5 + a2*r3*5 + a3*r2*5 + a4*r1*5;
# p[1] = a0*r1 + a1*r0 + a2*r4*5 + a3*r3*5 + a4*r2*5;
# p[2] = a0*r2 + a1*r1 + a2*r0 + a3*r4*5 + a4*r3*5;
# p[3] = a0*r3 + a1*r2 + a2*r1 + a3*r0 + a4*r4*5;
# p[4] = a0*r4 + a1*r3 + a2*r2 + a3*r1 + a4*r0 ;
#
# [r^2, r^3, r^1, r^4]
# [m3, m2, m4, m1]
#
# multiply odd and even words
.macro mul_odd
vmulouw 14, 4, 26
vmulouw 10, 5, 3
vmulouw 11, 6, 2
vmulouw 12, 7, 1
vmulouw 13, 8, 0
vmulouw 15, 4, 27
vaddudm 14, 14, 10
vaddudm 14, 14, 11
vmulouw 10, 5, 26
vmulouw 11, 6, 3
vaddudm 14, 14, 12
vaddudm 14, 14, 13 # x0
vaddudm 15, 15, 10
vaddudm 15, 15, 11
vmulouw 12, 7, 2
vmulouw 13, 8, 1
vaddudm 15, 15, 12
vaddudm 15, 15, 13 # x1
vmulouw 16, 4, 28
vmulouw 10, 5, 27
vmulouw 11, 6, 26
vaddudm 16, 16, 10
vaddudm 16, 16, 11
vmulouw 12, 7, 3
vmulouw 13, 8, 2
vaddudm 16, 16, 12
vaddudm 16, 16, 13 # x2
vmulouw 17, 4, 29
vmulouw 10, 5, 28
vmulouw 11, 6, 27
vaddudm 17, 17, 10
vaddudm 17, 17, 11
vmulouw 12, 7, 26
vmulouw 13, 8, 3
vaddudm 17, 17, 12
vaddudm 17, 17, 13 # x3
vmulouw 18, 4, 30
vmulouw 10, 5, 29
vmulouw 11, 6, 28
vaddudm 18, 18, 10
vaddudm 18, 18, 11
vmulouw 12, 7, 27
vmulouw 13, 8, 26
vaddudm 18, 18, 12
vaddudm 18, 18, 13 # x4
.endm
.macro mul_even
vmuleuw 9, 4, 26
vmuleuw 10, 5, 3
vmuleuw 11, 6, 2
vmuleuw 12, 7, 1
vmuleuw 13, 8, 0
vaddudm 14, 14, 9
vaddudm 14, 14, 10
vaddudm 14, 14, 11
vaddudm 14, 14, 12
vaddudm 14, 14, 13 # x0
vmuleuw 9, 4, 27
vmuleuw 10, 5, 26
vmuleuw 11, 6, 3
vmuleuw 12, 7, 2
vmuleuw 13, 8, 1
vaddudm 15, 15, 9
vaddudm 15, 15, 10
vaddudm 15, 15, 11
vaddudm 15, 15, 12
vaddudm 15, 15, 13 # x1
vmuleuw 9, 4, 28
vmuleuw 10, 5, 27
vmuleuw 11, 6, 26
vmuleuw 12, 7, 3
vmuleuw 13, 8, 2
vaddudm 16, 16, 9
vaddudm 16, 16, 10
vaddudm 16, 16, 11
vaddudm 16, 16, 12
vaddudm 16, 16, 13 # x2
vmuleuw 9, 4, 29
vmuleuw 10, 5, 28
vmuleuw 11, 6, 27
vmuleuw 12, 7, 26
vmuleuw 13, 8, 3
vaddudm 17, 17, 9
vaddudm 17, 17, 10
vaddudm 17, 17, 11
vaddudm 17, 17, 12
vaddudm 17, 17, 13 # x3
vmuleuw 9, 4, 30
vmuleuw 10, 5, 29
vmuleuw 11, 6, 28
vmuleuw 12, 7, 27
vmuleuw 13, 8, 26
vaddudm 18, 18, 9
vaddudm 18, 18, 10
vaddudm 18, 18, 11
vaddudm 18, 18, 12
vaddudm 18, 18, 13 # x4
.endm
#
# poly1305_setup_r
#
# setup r^4, r^3, r^2, r vectors
# [r, r^3, r^2, r^4]
# vs0 = [r0,...]
# vs1 = [r1,...]
# vs2 = [r2,...]
# vs3 = [r3,...]
# vs4 = [r4,...]
# vs5 = [r4*5,...]
# vs6 = [r3*5,...]
# vs7 = [r2*5,...]
# vs8 = [r1*5,...]
#
# r0, r4*5, r3*5, r2*5, r1*5;
# r1, r0, r4*5, r3*5, r2*5;
# r2, r1, r0, r4*5, r3*5;
# r3, r2, r1, r0, r4*5;
# r4, r3, r2, r1, r0 ;
#
.macro poly1305_setup_r
# save r
xxlor 26, 58, 58
xxlor 27, 59, 59
xxlor 28, 60, 60
xxlor 29, 61, 61
xxlor 30, 62, 62
xxlxor 31, 31, 31
# [r, r^3, r^2, r^4]
# compute r^2
vmr 4, 26
vmr 5, 27
vmr 6, 28
vmr 7, 29
vmr 8, 30
bl do_mul # r^2 r^1
xxpermdi 58, 58, 36, 0x3 # r0
xxpermdi 59, 59, 37, 0x3 # r1
xxpermdi 60, 60, 38, 0x3 # r2
xxpermdi 61, 61, 39, 0x3 # r3
xxpermdi 62, 62, 40, 0x3 # r4
xxpermdi 36, 36, 36, 0x3
xxpermdi 37, 37, 37, 0x3
xxpermdi 38, 38, 38, 0x3
xxpermdi 39, 39, 39, 0x3
xxpermdi 40, 40, 40, 0x3
vspltisb 13, 2
vsld 9, 27, 13
vsld 10, 28, 13
vsld 11, 29, 13
vsld 12, 30, 13
vaddudm 0, 9, 27
vaddudm 1, 10, 28
vaddudm 2, 11, 29
vaddudm 3, 12, 30
bl do_mul # r^4 r^3
vmrgow 26, 26, 4
vmrgow 27, 27, 5
vmrgow 28, 28, 6
vmrgow 29, 29, 7
vmrgow 30, 30, 8
vspltisb 13, 2
vsld 9, 27, 13
vsld 10, 28, 13
vsld 11, 29, 13
vsld 12, 30, 13
vaddudm 0, 9, 27
vaddudm 1, 10, 28
vaddudm 2, 11, 29
vaddudm 3, 12, 30
# r^2 r^4
xxlor 0, 58, 58
xxlor 1, 59, 59
xxlor 2, 60, 60
xxlor 3, 61, 61
xxlor 4, 62, 62
xxlor 5, 32, 32
xxlor 6, 33, 33
xxlor 7, 34, 34
xxlor 8, 35, 35
vspltw 9, 26, 3
vspltw 10, 26, 2
vmrgow 26, 10, 9
vspltw 9, 27, 3
vspltw 10, 27, 2
vmrgow 27, 10, 9
vspltw 9, 28, 3
vspltw 10, 28, 2
vmrgow 28, 10, 9
vspltw 9, 29, 3
vspltw 10, 29, 2
vmrgow 29, 10, 9
vspltw 9, 30, 3
vspltw 10, 30, 2
vmrgow 30, 10, 9
vsld 9, 27, 13
vsld 10, 28, 13
vsld 11, 29, 13
vsld 12, 30, 13
vaddudm 0, 9, 27
vaddudm 1, 10, 28
vaddudm 2, 11, 29
vaddudm 3, 12, 30
.endm
SYM_FUNC_START_LOCAL(do_mul)
mul_odd
# do reduction ( h %= p )
# carry reduction
vspltisb 9, 2
vsrd 10, 14, 31
vsrd 11, 17, 31
vand 7, 17, 25
vand 4, 14, 25
vaddudm 18, 18, 11
vsrd 12, 18, 31
vaddudm 15, 15, 10
vsrd 11, 15, 31
vand 8, 18, 25
vand 5, 15, 25
vaddudm 4, 4, 12
vsld 10, 12, 9
vaddudm 6, 16, 11
vsrd 13, 6, 31
vand 6, 6, 25
vaddudm 4, 4, 10
vsrd 10, 4, 31
vaddudm 7, 7, 13
vsrd 11, 7, 31
vand 7, 7, 25
vand 4, 4, 25
vaddudm 5, 5, 10
vaddudm 8, 8, 11
blr
SYM_FUNC_END(do_mul)
#
# init key
#
.macro do_poly1305_init
addis 10, 2, rmask@toc@ha
addi 10, 10, rmask@toc@l
ld 11, 0(10)
ld 12, 8(10)
li 14, 16
li 15, 32
addis 10, 2, cnum@toc@ha
addi 10, 10, cnum@toc@l
lvx 25, 0, 10 # v25 - mask
lvx 31, 14, 10 # v31 = 1a
lvx 19, 15, 10 # v19 = 1 << 24
lxv 24, 48(10) # vs24
lxv 25, 64(10) # vs25
# initialize
# load key from r3 to vectors
ld 9, 24(3)
ld 10, 32(3)
and. 9, 9, 11
and. 10, 10, 12
# break 26 bits
extrdi 14, 9, 26, 38
extrdi 15, 9, 26, 12
extrdi 16, 9, 12, 0
mtvsrdd 58, 0, 14
insrdi 16, 10, 14, 38
mtvsrdd 59, 0, 15
extrdi 17, 10, 26, 24
mtvsrdd 60, 0, 16
extrdi 18, 10, 24, 0
mtvsrdd 61, 0, 17
mtvsrdd 62, 0, 18
# r1 = r1 * 5, r2 = r2 * 5, r3 = r3 * 5, r4 = r4 * 5
li 9, 5
mtvsrdd 36, 0, 9
vmulouw 0, 27, 4 # v0 = rr0
vmulouw 1, 28, 4 # v1 = rr1
vmulouw 2, 29, 4 # v2 = rr2
vmulouw 3, 30, 4 # v3 = rr3
.endm
#
# poly1305_p10le_4blocks( uint8_t *k, uint32_t mlen, uint8_t *m)
# k = 32 bytes key
# r3 = k (r, s)
# r4 = mlen
# r5 = m
#
SYM_FUNC_START(poly1305_p10le_4blocks)
.align 5
cmpdi 5, 64
blt Out_no_poly1305
SAVE_REGS
do_poly1305_init
li 21, 0 # counter to message
poly1305_setup_r
# load previous H state
# break/convert r6 to 26 bits
ld 9, 0(3)
ld 10, 8(3)
ld 19, 16(3)
sldi 19, 19, 24
mtvsrdd 41, 0, 19
extrdi 14, 9, 26, 38
extrdi 15, 9, 26, 12
extrdi 16, 9, 12, 0
mtvsrdd 36, 0, 14
insrdi 16, 10, 14, 38
mtvsrdd 37, 0, 15
extrdi 17, 10, 26, 24
mtvsrdd 38, 0, 16
extrdi 18, 10, 24, 0
mtvsrdd 39, 0, 17
mtvsrdd 40, 0, 18
vor 8, 8, 9
# input m1 m2
add 20, 4, 21
xxlor 49, 24, 24
xxlor 50, 25, 25
lxvw4x 43, 0, 20
addi 17, 20, 16
lxvw4x 44, 0, 17
vperm 14, 11, 12, 17
vperm 15, 11, 12, 18
vand 9, 14, 25 # a0
vsrd 10, 14, 31 # >> 26
vsrd 11, 10, 31 # 12 bits left
vand 10, 10, 25 # a1
vspltisb 13, 12
vand 16, 15, 25
vsld 12, 16, 13
vor 11, 11, 12
vand 11, 11, 25 # a2
vspltisb 13, 14
vsrd 12, 15, 13 # >> 14
vsrd 13, 12, 31 # >> 26, a4
vand 12, 12, 25 # a3
vaddudm 20, 4, 9
vaddudm 21, 5, 10
vaddudm 22, 6, 11
vaddudm 23, 7, 12
vaddudm 24, 8, 13
# m3 m4
addi 17, 17, 16
lxvw4x 43, 0, 17
addi 17, 17, 16
lxvw4x 44, 0, 17
vperm 14, 11, 12, 17
vperm 15, 11, 12, 18
vand 9, 14, 25 # a0
vsrd 10, 14, 31 # >> 26
vsrd 11, 10, 31 # 12 bits left
vand 10, 10, 25 # a1
vspltisb 13, 12
vand 16, 15, 25
vsld 12, 16, 13
vspltisb 13, 14
vor 11, 11, 12
vand 11, 11, 25 # a2
vsrd 12, 15, 13 # >> 14
vsrd 13, 12, 31 # >> 26, a4
vand 12, 12, 25 # a3
# Smash 4 message blocks into 5 vectors of [m4, m2, m3, m1]
vmrgow 4, 9, 20
vmrgow 5, 10, 21
vmrgow 6, 11, 22
vmrgow 7, 12, 23
vmrgow 8, 13, 24
vaddudm 8, 8, 19
addi 5, 5, -64 # len -= 64
addi 21, 21, 64 # offset += 64
li 9, 64
divdu 31, 5, 9
cmpdi 31, 0
ble Skip_block_loop
mtctr 31
# h4 = m1 * r⁴ + m2 * r³ + m3 * r² + m4 * r
# Rewrite the polynominal sum of product as follows,
# h1 = (h0 + m1) * r^2, h2 = (h0 + m2) * r^2
# h3 = (h1 + m3) * r^2, h4 = (h2 + m4) * r^2 --> (h0 + m1) r*4 + (h3 + m3) r^2, (h0 + m2) r^4 + (h0 + m4) r^2
# .... Repeat
# h5 = (h3 + m5) * r^2, h6 = (h4 + m6) * r^2 -->
# h7 = (h5 + m7) * r^2, h8 = (h6 + m8) * r^1 --> m5 * r^4 + m6 * r^3 + m7 * r^2 + m8 * r
#
loop_4blocks:
# Multiply odd words and even words
mul_odd
mul_even
# carry reduction
vspltisb 9, 2
vsrd 10, 14, 31
vsrd 11, 17, 31
vand 7, 17, 25
vand 4, 14, 25
vaddudm 18, 18, 11
vsrd 12, 18, 31
vaddudm 15, 15, 10
vsrd 11, 15, 31
vand 8, 18, 25
vand 5, 15, 25
vaddudm 4, 4, 12
vsld 10, 12, 9
vaddudm 6, 16, 11
vsrd 13, 6, 31
vand 6, 6, 25
vaddudm 4, 4, 10
vsrd 10, 4, 31
vaddudm 7, 7, 13
vsrd 11, 7, 31
vand 7, 7, 25
vand 4, 4, 25
vaddudm 5, 5, 10
vaddudm 8, 8, 11
# input m1 m2 m3 m4
add 20, 4, 21
xxlor 49, 24, 24
xxlor 50, 25, 25
lxvw4x 43, 0, 20
addi 17, 20, 16
lxvw4x 44, 0, 17
vperm 14, 11, 12, 17
vperm 15, 11, 12, 18
addi 17, 17, 16
lxvw4x 43, 0, 17
addi 17, 17, 16
lxvw4x 44, 0, 17
vperm 17, 11, 12, 17
vperm 18, 11, 12, 18
vand 20, 14, 25 # a0
vand 9, 17, 25 # a0
vsrd 21, 14, 31 # >> 26
vsrd 22, 21, 31 # 12 bits left
vsrd 10, 17, 31 # >> 26
vsrd 11, 10, 31 # 12 bits left
vand 21, 21, 25 # a1
vand 10, 10, 25 # a1
vspltisb 13, 12
vand 16, 15, 25
vsld 23, 16, 13
vor 22, 22, 23
vand 22, 22, 25 # a2
vand 16, 18, 25
vsld 12, 16, 13
vor 11, 11, 12
vand 11, 11, 25 # a2
vspltisb 13, 14
vsrd 23, 15, 13 # >> 14
vsrd 24, 23, 31 # >> 26, a4
vand 23, 23, 25 # a3
vsrd 12, 18, 13 # >> 14
vsrd 13, 12, 31 # >> 26, a4
vand 12, 12, 25 # a3
vaddudm 4, 4, 20
vaddudm 5, 5, 21
vaddudm 6, 6, 22
vaddudm 7, 7, 23
vaddudm 8, 8, 24
# Smash 4 message blocks into 5 vectors of [m4, m2, m3, m1]
vmrgow 4, 9, 4
vmrgow 5, 10, 5
vmrgow 6, 11, 6
vmrgow 7, 12, 7
vmrgow 8, 13, 8
vaddudm 8, 8, 19
addi 5, 5, -64 # len -= 64
addi 21, 21, 64 # offset += 64
bdnz loop_4blocks
Skip_block_loop:
xxlor 58, 0, 0
xxlor 59, 1, 1
xxlor 60, 2, 2
xxlor 61, 3, 3
xxlor 62, 4, 4
xxlor 32, 5, 5
xxlor 33, 6, 6
xxlor 34, 7, 7
xxlor 35, 8, 8
# Multiply odd words and even words
mul_odd
mul_even
# Sum the products.
xxpermdi 41, 31, 46, 0
xxpermdi 42, 31, 47, 0
vaddudm 4, 14, 9
xxpermdi 36, 31, 36, 3
vaddudm 5, 15, 10
xxpermdi 37, 31, 37, 3
xxpermdi 43, 31, 48, 0
vaddudm 6, 16, 11
xxpermdi 38, 31, 38, 3
xxpermdi 44, 31, 49, 0
vaddudm 7, 17, 12
xxpermdi 39, 31, 39, 3
xxpermdi 45, 31, 50, 0
vaddudm 8, 18, 13
xxpermdi 40, 31, 40, 3
# carry reduction
vspltisb 9, 2
vsrd 10, 4, 31
vsrd 11, 7, 31
vand 7, 7, 25
vand 4, 4, 25
vaddudm 8, 8, 11
vsrd 12, 8, 31
vaddudm 5, 5, 10
vsrd 11, 5, 31
vand 8, 8, 25
vand 5, 5, 25
vaddudm 4, 4, 12
vsld 10, 12, 9
vaddudm 6, 6, 11
vsrd 13, 6, 31
vand 6, 6, 25
vaddudm 4, 4, 10
vsrd 10, 4, 31
vaddudm 7, 7, 13
vsrd 11, 7, 31
vand 7, 7, 25
vand 4, 4, 25
vaddudm 5, 5, 10
vsrd 10, 5, 31
vand 5, 5, 25
vaddudm 6, 6, 10
vaddudm 8, 8, 11
b do_final_update
do_final_update:
# combine 26 bit limbs
# v4, v5, v6, v7 and v8 are 26 bit vectors
vsld 5, 5, 31
vor 20, 4, 5
vspltisb 11, 12
vsrd 12, 6, 11
vsld 6, 6, 31
vsld 6, 6, 31
vor 20, 20, 6
vspltisb 11, 14
vsld 7, 7, 11
vor 21, 7, 12
mfvsrld 16, 40 # save last 2 bytes
vsld 8, 8, 11
vsld 8, 8, 31
vor 21, 21, 8
mfvsrld 17, 52
mfvsrld 19, 53
srdi 16, 16, 24
std 17, 0(3)
std 19, 8(3)
stw 16, 16(3)
Out_loop:
li 3, 0
RESTORE_REGS
blr
Out_no_poly1305:
li 3, 0
blr
SYM_FUNC_END(poly1305_p10le_4blocks)
#
# =======================================================================
# The following functions implement 64 x 64 bits multiplication poly1305.
#
SYM_FUNC_START_LOCAL(Poly1305_init_64)
# mask 0x0FFFFFFC0FFFFFFC
# mask 0x0FFFFFFC0FFFFFFF
addis 10, 2, rmask@toc@ha
addi 10, 10, rmask@toc@l
ld 11, 0(10)
ld 12, 8(10)
# initialize
# load key from r3
ld 9, 24(3)
ld 10, 32(3)
and. 9, 9, 11 # cramp mask r0
and. 10, 10, 12 # cramp mask r1
srdi 21, 10, 2
add 19, 21, 10 # s1: r19 - (r1 >> 2) *5
# setup r and s
li 25, 0
mtvsrdd 32+0, 9, 19 # r0, s1
mtvsrdd 32+1, 10, 9 # r1, r0
mtvsrdd 32+2, 19, 25 # s1
mtvsrdd 32+3, 9, 25 # r0
blr
SYM_FUNC_END(Poly1305_init_64)
# Poly1305_mult
# v6 = (h0, h1), v8 = h2
# v0 = (r0, s1), v1 = (r1, r0), v2 = s1, v3 = r0
#
# Output: v7, v10, v11
#
SYM_FUNC_START_LOCAL(Poly1305_mult)
#
# d0 = h0 * r0 + h1 * s1
vmsumudm 7, 6, 0, 9 # h0 * r0, h1 * s1
# d1 = h0 * r1 + h1 * r0 + h2 * s1
vmsumudm 11, 6, 1, 9 # h0 * r1, h1 * r0
vmsumudm 10, 8, 2, 11 # d1 += h2 * s1
# d2 = r0
vmsumudm 11, 8, 3, 9 # d2 = h2 * r0
blr
SYM_FUNC_END(Poly1305_mult)
#
# carry reduction
# h %=p
#
# Input: v7, v10, v11
# Output: r27, r28, r29
#
SYM_FUNC_START_LOCAL(Carry_reduction)
mfvsrld 27, 32+7
mfvsrld 28, 32+10
mfvsrld 29, 32+11
mfvsrd 20, 32+7 # h0.h
mfvsrd 21, 32+10 # h1.h
addc 28, 28, 20
adde 29, 29, 21
srdi 22, 29, 0x2
sldi 23, 22, 0x2
add 23, 23, 22 # (h2 & 3) * 5
addc 27, 27, 23 # h0
addze 28, 28 # h1
andi. 29, 29, 0x3 # h2
blr
SYM_FUNC_END(Carry_reduction)
#
# poly1305 multiplication
# h *= r, h %= p
# d0 = h0 * r0 + h1 * s1
# d1 = h0 * r1 + h1 * r0 + h2 * s1
# d2 = h0 * r0
#
#
# unsigned int poly1305_test_64s(unisgned char *state, const byte *src, size_t len, highbit)
# - no highbit if final leftover block (highbit = 0)
#
SYM_FUNC_START(poly1305_64s)
cmpdi 5, 0
ble Out_no_poly1305_64
mflr 0
std 0, 16(1)
stdu 1,-400(1)
SAVE_GPR 14, 112, 1
SAVE_GPR 15, 120, 1
SAVE_GPR 16, 128, 1
SAVE_GPR 17, 136, 1
SAVE_GPR 18, 144, 1
SAVE_GPR 19, 152, 1
SAVE_GPR 20, 160, 1
SAVE_GPR 21, 168, 1
SAVE_GPR 22, 176, 1
SAVE_GPR 23, 184, 1
SAVE_GPR 24, 192, 1
SAVE_GPR 25, 200, 1
SAVE_GPR 26, 208, 1
SAVE_GPR 27, 216, 1
SAVE_GPR 28, 224, 1
SAVE_GPR 29, 232, 1
SAVE_GPR 30, 240, 1
SAVE_GPR 31, 248, 1
# Init poly1305
bl Poly1305_init_64
li 25, 0 # offset to inp and outp
add 11, 25, 4
# load h
# h0, h1, h2?
ld 27, 0(3)
ld 28, 8(3)
lwz 29, 16(3)
li 30, 16
divdu 31, 5, 30
mtctr 31
mr 24, 6 # highbit
Loop_block_64:
vxor 9, 9, 9
ld 20, 0(11)
ld 21, 8(11)
addi 11, 11, 16
addc 27, 27, 20
adde 28, 28, 21
adde 29, 29, 24
li 22, 0
mtvsrdd 32+6, 27, 28 # h0, h1
mtvsrdd 32+8, 29, 22 # h2
bl Poly1305_mult
bl Carry_reduction
bdnz Loop_block_64
std 27, 0(3)
std 28, 8(3)
stw 29, 16(3)
li 3, 0
RESTORE_GPR 14, 112, 1
RESTORE_GPR 15, 120, 1
RESTORE_GPR 16, 128, 1
RESTORE_GPR 17, 136, 1
RESTORE_GPR 18, 144, 1
RESTORE_GPR 19, 152, 1
RESTORE_GPR 20, 160, 1
RESTORE_GPR 21, 168, 1
RESTORE_GPR 22, 176, 1
RESTORE_GPR 23, 184, 1
RESTORE_GPR 24, 192, 1
RESTORE_GPR 25, 200, 1
RESTORE_GPR 26, 208, 1
RESTORE_GPR 27, 216, 1
RESTORE_GPR 28, 224, 1
RESTORE_GPR 29, 232, 1
RESTORE_GPR 30, 240, 1
RESTORE_GPR 31, 248, 1
addi 1, 1, 400
ld 0, 16(1)
mtlr 0
blr
Out_no_poly1305_64:
li 3, 0
blr
SYM_FUNC_END(poly1305_64s)
#
# Input: r3 = h, r4 = s, r5 = mac
# mac = h + s
#
SYM_FUNC_START(poly1305_emit_64)
ld 10, 0(3)
ld 11, 8(3)
ld 12, 16(3)
# compare modulus
# h + 5 + (-p)
mr 6, 10
mr 7, 11
mr 8, 12
addic. 6, 6, 5
addze 7, 7
addze 8, 8
srdi 9, 8, 2 # overflow?
cmpdi 9, 0
beq Skip_h64
mr 10, 6
mr 11, 7
mr 12, 8
Skip_h64:
ld 6, 0(4)
ld 7, 8(4)
addc 10, 10, 6
adde 11, 11, 7
addze 12, 12
std 10, 0(5)
std 11, 8(5)
blr
SYM_FUNC_END(poly1305_emit_64)
SYM_DATA_START_LOCAL(RMASK)
.align 5
rmask:
.byte 0xff, 0xff, 0xff, 0x0f, 0xfc, 0xff, 0xff, 0x0f, 0xfc, 0xff, 0xff, 0x0f, 0xfc, 0xff, 0xff, 0x0f
cnum:
.long 0x03ffffff, 0x00000000, 0x03ffffff, 0x00000000
.long 0x1a, 0x00, 0x1a, 0x00
.long 0x01000000, 0x01000000, 0x01000000, 0x01000000
.long 0x00010203, 0x04050607, 0x10111213, 0x14151617
.long 0x08090a0b, 0x0c0d0e0f, 0x18191a1b, 0x1c1d1e1f
SYM_DATA_END(RMASK)
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