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C powerpc64/p8/ghash-set-key.asm
ifelse(`
Copyright (C) 2020, 2022 Niels Möller and 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/.
')
C Register usage:
define(`SP', `r1')
define(`TOCP', `r2')
define(`CTX', `r3')
define(`KEY', `r4')
define(`ZERO', `v0')
define(`B1', `v1')
define(`EMSB', `v16')
define(`POLY', `v17')
define(`POLY_L', `v1')
define(`H', `v2')
define(`H2', `v3')
define(`H3', `v4')
define(`H4', `v5')
define(`H1M', `v6')
define(`H1L', `v7')
define(`H2M', `v8')
define(`H2L', `v9')
define(`Hl', `v10')
define(`Hm', `v11')
define(`Hp', `v12')
define(`Hl2', `v13')
define(`Hm2', `v14')
define(`Hp2', `v15')
define(`R', `v13')
define(`F', `v14')
define(`T', `v15')
define(`R2', `v16')
define(`F2', `v17')
define(`T2', `v18')
define(`LE_TEMP', `v18')
define(`LE_MASK', `v19')
.file "ghash-set-key.asm"
.text
C void _ghash_set_key (struct gcm_key *ctx, const union nettle_block16 *key)
C This function populates the gcm table as the following layout
C *******************************************************************************
C | H1M = (H1 div x⁶⁴)||((H1 mod x⁶⁴) × (x⁶⁴+x⁶³+x⁶²+x⁵⁷)) div x⁶⁴ |
C | H1L = (H1 mod x⁶⁴)||(((H1 mod x⁶⁴) × (x⁶³+x⁶²+x⁵⁷)) mod x⁶⁴) + (H1 div x⁶⁴) |
C | |
C | H2M = (H2 div x⁶⁴)||((H2 mod x⁶⁴) × (x⁶⁴+x⁶³+x⁶²+x⁵⁷)) div x⁶⁴ |
C | H2L = (H2 mod x⁶⁴)||(((H2 mod x⁶⁴) × (x⁶³+x⁶²+x⁵⁷)) mod x⁶⁴) + (H2 div x⁶⁴) |
C | |
C | H3M = (H3 div x⁶⁴)||((H3 mod x⁶⁴) × (x⁶⁴+x⁶³+x⁶²+x⁵⁷)) div x⁶⁴ |
C | H3L = (H3 mod x⁶⁴)||(((H3 mod x⁶⁴) × (x⁶³+x⁶²+x⁵⁷)) mod x⁶⁴) + (H3 div x⁶⁴) |
C | |
C | H4M = (H3 div x⁶⁴)||((H4 mod x⁶⁴) × (x⁶⁴+x⁶³+x⁶²+x⁵⁷)) div x⁶⁴ |
C | H4L = (H3 mod x⁶⁴)||(((H4 mod x⁶⁴) × (x⁶³+x⁶²+x⁵⁷)) mod x⁶⁴) + (H4 div x⁶⁴) |
C *******************************************************************************
define(`FUNC_ALIGN', `5')
PROLOGUE(_nettle_ghash_set_key)
DATA_LOAD_VEC(POLY,.polynomial,r7) C 0xC2000000000000000000000000000001
IF_LE(`
li r8,0
lvsl LE_MASK,0,r8 C 0x000102030405060708090A0B0C0D0E0F
vspltisb LE_TEMP,0x07 C 0x07070707070707070707070707070707
vxor LE_MASK,LE_MASK,LE_TEMP C 0x07060504030201000F0E0D0C0B0A0908
')
C 'H' is assigned by gcm_set_key() to the middle element of the table
lxvd2x VSR(H),0,KEY C load 'H'
C byte-reverse of each doubleword permuting on little-endian mode
IF_LE(`
vperm H,H,H,LE_MASK
')
C --- calculate H = H << 1 mod P(X), P(X) = (x¹²⁸+x¹²⁷+x¹²⁶+x¹²¹+1) ---
vupkhsb EMSB,H C extend most significant bit to first byte
vspltisb B1,1 C 0x01010101010101010101010101010101
vspltb EMSB,EMSB,0 C first byte quadword-extend
vsl H,H,B1 C H = H << 1
vand EMSB,EMSB,POLY C EMSB &= 0xC2000000000000000000000000000001
vxor ZERO,ZERO,ZERO C 0x00000000000000000000000000000000
vxor H,H,EMSB C H ^= EMSB
C --- calculate H^2 = H*H ---
xxmrghd VSR(POLY_L),VSR(ZERO),VSR(POLY) C 0x0000000000000000C200000000000000
C --- Hp = (H mod x⁶⁴) / x⁶⁴ mod P(X) ---
C --- Hp = (H mod x⁶⁴) × (x⁶⁴+x⁶³+x⁶²+x⁵⁷) mod P(X), deg(Hp) ≤ 127 ---
C --- Hp = (H mod x⁶⁴) × (x⁶⁴+x⁶³+x⁶²+x⁵⁷) ---
vpmsumd Hp,H,POLY_L C Hp = (H mod x⁶⁴) × (x⁶³+x⁶²+x⁵⁷)
xxswapd VSR(Hm),VSR(H)
xxmrgld VSR(Hl),VSR(H),VSR(ZERO) C Hl = (H mod x⁶⁴) × x⁶⁴
vxor Hm,Hm,Hp C Hm = Hm + Hp
vxor Hl,Hl,Hp C Hl = Hl + Hp
xxmrgld VSR(H1L),VSR(H),VSR(Hm) C H1L = (H mod x⁶⁴)||(Hl mod x⁶⁴)
xxmrghd VSR(H1M),VSR(H),VSR(Hl) C H1M = (H div x⁶⁴)||(Hl div x⁶⁴)
vpmsumd F,H1L,H C F = (H1Lh × Hh) + (H1Ll × Hl)
vpmsumd R,H1M,H C R = (H1Mh × Hh) + (H1Ml × Hl)
C --- rduction ---
vpmsumd T,F,POLY_L C T = (F mod x⁶⁴) × (x⁶³+x⁶²+x⁵⁷)
xxswapd VSR(H2),VSR(F)
vxor R,R,T C R = R + T
vxor H2,R,H2
xxmrgld VSR(Hl),VSR(H2),VSR(ZERO)
xxswapd VSR(Hm),VSR(H2)
vpmsumd Hp,H2,POLY_L
vxor Hl,Hl,Hp
vxor Hm,Hm,Hp
xxmrghd VSR(H2M),VSR(H2),VSR(Hl)
xxmrgld VSR(H2L),VSR(H2),VSR(Hm)
C store H1M, H1L, H2M, H2L
li r8,1*16
li r9,2*16
li r10,3*16
stxvd2x VSR(H1M),0,CTX
stxvd2x VSR(H1L),r8,CTX
stxvd2x VSR(H2M),r9,CTX
stxvd2x VSR(H2L),r10,CTX
C --- calculate H^3 = H^1*H^2, H^4 = H^2*H^2 ---
vpmsumd F,H1L,H2
vpmsumd F2,H2L,H2
vpmsumd R,H1M,H2
vpmsumd R2,H2M,H2
vpmsumd T,F,POLY_L
vpmsumd T2,F2,POLY_L
xxswapd VSR(H3),VSR(F)
xxswapd VSR(H4),VSR(F2)
vxor R,R,T
vxor R2,R2,T2
vxor H3,R,H3
vxor H4,R2,H4
xxmrgld VSR(Hl),VSR(H3),VSR(ZERO)
xxmrgld VSR(Hl2),VSR(H4),VSR(ZERO)
xxswapd VSR(Hm),VSR(H3)
xxswapd VSR(Hm2),VSR(H4)
vpmsumd Hp,H3,POLY_L
vpmsumd Hp2,H4,POLY_L
vxor Hl,Hl,Hp
vxor Hl2,Hl2,Hp2
vxor Hm,Hm,Hp
vxor Hm2,Hm2,Hp2
xxmrghd VSR(H1M),VSR(H3),VSR(Hl)
xxmrghd VSR(H2M),VSR(H4),VSR(Hl2)
xxmrgld VSR(H1L),VSR(H3),VSR(Hm)
xxmrgld VSR(H2L),VSR(H4),VSR(Hm2)
C store H3M, H3L, H4M, H4L
li r7,4*16
li r8,5*16
li r9,6*16
li r10,7*16
stxvd2x VSR(H1M),r7,CTX
stxvd2x VSR(H1L),r8,CTX
stxvd2x VSR(H2M),r9,CTX
stxvd2x VSR(H2L),r10,CTX
blr
EPILOGUE(_nettle_ghash_set_key)
.data
C 0xC2000000000000000000000000000001
.polynomial:
.align 4
IF_BE(`
.byte 0xC2
.rept 14
.byte 0x00
.endr
.byte 0x01
',`
.byte 0x01
.rept 14
.byte 0x00
.endr
.byte 0xC2
')
|
