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internal/sm2ec: ppc64le, change p256NegCond to constant-time

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Sun Yimin 2024-08-28 13:42:06 +08:00 committed by GitHub
parent b69000109b
commit 35d5ddeaf4
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1 changed files with 17 additions and 7 deletions
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24
internal/sm2ec/p256_asm_ppc64le.s
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@ -121,15 +121,20 @@ GLOBL p256mul<>(SB), 8, $96
#define PL V30
#define PH V31
#define SEL V4
#define ZER V5
#define CAR1 V6
// func p256NegCond(val *p256Point, cond int)
TEXT ·p256NegCond(SB), NOSPLIT, $0-16
MOVD val+0(FP), P1ptr
MOVD $16, R16
MOVD $48, R17
MOVD cond+8(FP), R6
CMP $0, R6
BC 12, 2, LR // just return if cond == 0
// cond is R1 + 16 (cond offset) + 32
LXVDSX (R1)(R17), SEL
VSPLTISB $0, ZER
// SEL controls whether to store a or b
VCMPEQUD SEL, ZER, SEL
MOVD $p256mul<>+0x00(SB), CPOOL
@ -145,12 +150,15 @@ TEXT ·p256NegCond(SB), NOSPLIT, $0-16
VSUBCUQ PL, Y1L, CAR1 // subtract part2 giving carry
VSUBUQM PL, Y1L, T1L // subtract part2 giving result
VSUBEUQM PH, Y1H, CAR1, T1H // subtract part1 using carry from part2
VSEL X1H, T1H, SEL, X1H
VSEL X1L, T1L, SEL, X1L
XXPERMDI T1H, T1H, $2, T1H
XXPERMDI T1L, T1L, $2, T1L
XXPERMDI X1H, X1H, $2, X1H
XXPERMDI X1L, X1L, $2, X1L
STXVD2X T1L, (R0+P1ptr)
STXVD2X T1H, (R16+P1ptr)
STXVD2X X1L, (R0+P1ptr)
STXVD2X X1H, (R16+P1ptr)
RET
#undef P1ptr
@ -161,6 +169,8 @@ TEXT ·p256NegCond(SB), NOSPLIT, $0-16
#undef T1H
#undef PL
#undef PH
#undef ZER
#undef SEL
#undef CAR1
#define P3ptr R3