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|
C powerpc64/p9/poly1305-internal.asm
ifelse(`
Copyright (C) 2013, 2022 Niels Möller
Copyright (C) 2022 Mamone Tarsha
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
')
include_src(`powerpc64/p9/poly1305.m4')
C Register usage:
define(`SP', `r1')
define(`TOCP', `r2')
C State inputs
define(`H0', `r6')
define(`H1', `r7')
define(`H2', `r8')
C State outputs
define(`F0', `v1')
define(`F1', `v2')
.text
C _poly1305_set_key(struct poly1305_ctx *ctx, const uint8_t key[16])
define(`FUNC_ALIGN', `5')
PROLOGUE(_nettle_poly1305_set_key)
li r9, 0
addis r5, TOCP, .key_mask@got@ha
ld r5, .key_mask@got@l(r5)
ld r8, 0(r5)
ori r7, r8, 3
C Load R_0 and R_1
IF_LE(`
ld r5, 0(r4)
ld r6, 8(r4)
')
IF_BE(`
ldbrx r5, 0, r4
addi r4, r4, 8
ldbrx r6, 0, r4
')
and r5, r5, r7 C R_0 &= 0x0FFFFFFC0FFFFFFF
and r6, r6, r8 C R_1 &= 0x0FFFFFFC0FFFFFFC
srdi r10, r6, 2
sldi r7, r5, 2
sldi r8, r10, 2
add r7, r7, r5
add r8, r8, r10
C Store key
std r5, P1305_R0 (r3)
std r6, P1305_R1 (r3)
std r7, P1305_S0 (r3)
std r8, P1305_S1 (r3)
C Reset state
std r9, P1305_H0 (r3)
std r9, P1305_H1 (r3)
std r9, P1305_H2 (r3)
blr
EPILOGUE(_nettle_poly1305_set_key)
C void _nettle_poly1305_block(struct poly1305_ctx *ctx, const uint8_t *m, unsigned m128)
define(`FUNC_ALIGN', `5')
PROLOGUE(_nettle_poly1305_block)
ld H0, P1305_H0 (CTX)
ld H1, P1305_H1 (CTX)
ld H2, P1305_H2 (CTX)
BLOCK_R64(F0,F1,H0,H1,H2)
li r10, P1305_H1
xxswapd VSR(F0), VSR(F0)
xxswapd VSR(F1), VSR(F1)
stxsd F0, P1305_H0 (CTX)
stxvd2x VSR(F1), r10, CTX
blr
EPILOGUE(_nettle_poly1305_block)
C _poly1305_digest (struct poly1305_ctx *ctx, uint8_t *s)
define(`FUNC_ALIGN', `5')
PROLOGUE(_nettle_poly1305_digest)
C Load current state
ld r5, P1305_H0 (r3)
ld r6, P1305_H1 (r3)
ld r7, P1305_H2 (r3)
C Fold high part of H2
li r10, 0
srdi r9, r7, 2
sldi r8, r9, 2
add r8, r8, r9
andi. r7, r7, 3
addc r5, r5, r8
adde r6, r6, r10
adde r7, r7, r10
C Add 5 to state, save result if it carries
li r8, 5
li r9, 0
li r10, -4
addc r8, r8, r5
adde r9, r9, r6
adde. r10, r10, r7
iseleq r5, r8, r5
iseleq r6, r9, r6
C Load digest
IF_LE(`
ld r7, 0(r4)
ld r8, 8(r4)
')
IF_BE(`
li r10, 8
ldbrx r7, 0, r4
ldbrx r8, r10, r4
')
C Add hash to digest
addc r5, r5, r7
adde r6, r6, r8
C Store digest
IF_LE(`
std r5, 0(r4)
std r6, 8(r4)
')
IF_BE(`
stdbrx r5, 0, r4
stdbrx r6, r10, r4
')
C Reset hash
li r9, 0
std r9, P1305_H0 (r3)
std r9, P1305_H1 (r3)
std r9, P1305_H2 (r3)
blr
EPILOGUE(_nettle_poly1305_digest)
.rodata
.align 3
.key_mask:
.quad 0x0FFFFFFC0FFFFFFC
|
