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sm2/sm9: eliminate bounds checks in the loop of Select

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Sun Yimin 2023-06-21 11:52:32 +08:00 committed by GitHub
parent 2da0a9cebc
commit 9bcbf9bae9
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 13 additions and 13 deletions
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6
internal/sm2ec/sm2p256.go
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@ -322,9 +322,9 @@ func (table *sm2p256Table) Select(p *SM2P256Point, n uint8) {
panic("sm2ec: internal error: sm2p256Table called with out-of-bounds value") panic("sm2ec: internal error: sm2p256Table called with out-of-bounds value")
} }
p.Set(NewSM2P256Point()) p.Set(NewSM2P256Point())
for i := uint8(1); i < 16; i++ { for i, f := range table {
cond := subtle.ConstantTimeByteEq(i, n) cond := subtle.ConstantTimeByteEq(uint8(i+1), n)
p.Select(table[i-1], p, cond) p.Select(f, p, cond)
} }
} }

6
sm9/bn256/curve.go
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@ -270,8 +270,8 @@ func (table *curvePointTable) Select(p *curvePoint, n uint8) {
panic("sm9: internal error: curvePointTable called with out-of-bounds value") panic("sm9: internal error: curvePointTable called with out-of-bounds value")
} }
p.SetInfinity() p.SetInfinity()
for i := uint8(1); i < 16; i++ { for i, f := range table {
cond := subtle.ConstantTimeByteEq(i, n) cond := subtle.ConstantTimeByteEq(uint8(i+1), n)
p.Select(table[i-1], p, cond) p.Select(f, p, cond)
} }
} }

2
sm9/bn256/gfp_generic.go
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@ -30,7 +30,7 @@ func gfpNeg(c, a *gfP) {
for i, pi := range p2 { for i, pi := range p2 {
c[i], carry = bits.Sub64(pi, a[i], carry) c[i], carry = bits.Sub64(pi, a[i], carry)
} }
// required for "zero", bn256 treat infinity point as valid // required for "zero", bn256 treats infinity point as valid
gfpCarry(c, 0) gfpCarry(c, 0)
} }

6
sm9/bn256/gt.go
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@ -211,9 +211,9 @@ func (table *GTFieldTable) Select(p *GT, n uint8) {
panic("sm9: internal error: GTFieldTable called with out-of-bounds value") panic("sm9: internal error: GTFieldTable called with out-of-bounds value")
} }
p.p.SetOne() p.p.SetOne()
for i := uint8(1); i < 16; i++ { for i, f := range table {
cond := subtle.ConstantTimeByteEq(i, n) cond := subtle.ConstantTimeByteEq(uint8(i+1), n)
p.p.Select(table[i-1].p, p.p, cond) p.p.Select(f.p, p.p, cond)
} }
} }

6
sm9/bn256/twist.go
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@ -262,9 +262,9 @@ func (table *twistPointTable) Select(p *twistPoint, n uint8) {
panic("sm9: internal error: twistPointTable called with out-of-bounds value") panic("sm9: internal error: twistPointTable called with out-of-bounds value")
} }
p.SetInfinity() p.SetInfinity()
for i := uint8(1); i < 16; i++ { for i, f := range table {
cond := subtle.ConstantTimeByteEq(i, n) cond := subtle.ConstantTimeByteEq(uint8(i+1), n)
p.Select(table[i-1], p, cond) p.Select(f, p, cond)
} }
} }