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//go:build (!purego && arm64) || (!purego && amd64)
// +build !purego,arm64 !purego,amd64
package p384
import (
"crypto/elliptic"
"crypto/rand"
"math/big"
"testing"
"github.com/cloudflare/circl/internal/test"
)
func TestFpCmov(t *testing.T) {
var x, y, z fp384
for _, b := range []int{-2, -1, 1, 2} {
_, _ = rand.Read(x[:])
_, _ = rand.Read(y[:])
z = x
fp384Cmov(&z, &y, b)
got := z
want := y
if got != want {
test.ReportError(t, got, want, b, x, y)
}
}
_, _ = rand.Read(x[:])
_, _ = rand.Read(y[:])
z = x
fp384Cmov(&z, &y, 0)
got := z
want := x
if got != want {
test.ReportError(t, got, want, 0, x, y)
}
}
func TestFpNegZero(t *testing.T) {
zero, x := &fp384{}, &fp384{}
fp384Neg(x, zero)
got := x.BigInt()
want := zero.BigInt()
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x)
}
}
func TestFpSetBigInt(t *testing.T) {
P := elliptic.P384().Params().P
neg := big.NewInt(-0xFF) // negative
zero := big.NewInt(0) // zero
one := big.NewInt(1) // one
two96 := new(big.Int).Lsh(one, 96) // 2^96
two384 := new(big.Int).Lsh(one, 384) // 2^384
two384two96 := new(big.Int).Sub(two384, two96) // 2^384-2^96
two768 := new(big.Int).Lsh(one, 768) // 2^768
for id, b := range []*big.Int{
neg, zero, one, two96, two384, two384two96, two768,
} {
var x fp384
x.SetBigInt(b)
got := x.BigInt()
if b.BitLen() > 384 || b.Sign() < 0 {
b.Mod(b, P)
}
want := b
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, id)
}
}
}
func TestMulZero(t *testing.T) {
x, zero := &fp384{}, &fp384{}
_, _ = rand.Read(x[:])
fp384Mul(x, x, zero)
got := x.BigInt()
want := zero.BigInt()
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x)
}
}
func TestFp(t *testing.T) {
P := elliptic.P384().Params().P
x, y, z := &fp384{}, &fp384{}, &fp384{}
testTimes := 1 << 12
var bigR, bigR2, bigRinv big.Int
one := big.NewInt(1)
bigR.Lsh(one, 384).Mod(&bigR, P)
bigR2.Lsh(one, 2*384).Mod(&bigR2, P)
bigRinv.ModInverse(&bigR, P)
t.Run("Encode", func(t *testing.T) {
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(x[:])
bigX := x.BigInt()
// fp384
montEncode(z, x)
got := z.BigInt()
// big.Int
want := bigX.Mul(bigX, &bigR).Mod(bigX, P)
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x)
}
}
})
t.Run("Decode", func(t *testing.T) {
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(x[:])
bigX := x.BigInt()
// fp384
montDecode(z, x)
got := z.BigInt()
// big.Int
want := bigX.Mul(bigX, new(big.Int).ModInverse(&bigR, P)).Mod(bigX, P)
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x)
}
}
})
t.Run("Neg", func(t *testing.T) {
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(x[:])
bigX := x.BigInt()
// fp384
fp384Neg(z, x)
got := z.BigInt()
// big.Int
want := bigX.Neg(bigX).Mod(bigX, P)
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x)
}
}
})
t.Run("Add", func(t *testing.T) {
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(x[:])
_, _ = rand.Read(y[:])
bigX := x.BigInt()
bigY := y.BigInt()
// fp384
fp384Add(z, x, y)
got := z.BigInt()
// big.Int
want := bigX.Add(bigX, bigY)
want = want.Mod(want, P)
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x, y)
}
}
})
t.Run("Sub", func(t *testing.T) {
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(x[:])
_, _ = rand.Read(y[:])
bigX := x.BigInt()
bigY := y.BigInt()
// fp384
fp384Sub(z, x, y)
got := z.BigInt()
// big.Int
want := bigX.Sub(bigX, bigY)
want = want.Mod(want, P)
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x, y)
}
}
})
t.Run("Mul", func(t *testing.T) {
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(x[:])
_, _ = rand.Read(y[:])
bigX := x.BigInt()
bigY := y.BigInt()
// fp384
fp384Mul(z, x, y)
got := z.BigInt()
// big.Int
want := bigX.Mul(bigX, bigY).Mul(bigX, &bigRinv).Mod(bigX, P)
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x, y)
}
}
})
t.Run("Inv", func(t *testing.T) {
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(x[:])
bigX := x.BigInt()
// fp384
fp384Inv(z, x)
got := z.BigInt()
// big.Int
want := bigX.ModInverse(bigX, P).Mul(bigX, &bigR2).Mod(bigX, P)
if got.Cmp(want) != 0 {
test.ReportError(t, got, want, x)
}
}
})
}
func BenchmarkFp(b *testing.B) {
x, y, z := &fp384{}, &fp384{}, &fp384{}
b.Run("Add", func(b *testing.B) {
for i := 0; i < b.N; i++ {
fp384Add(z, x, y)
}
})
b.Run("Sub", func(b *testing.B) {
for i := 0; i < b.N; i++ {
fp384Sub(z, x, y)
}
})
b.Run("Mul", func(b *testing.B) {
for i := 0; i < b.N; i++ {
fp384Mul(z, x, y)
}
})
b.Run("Sqr", func(b *testing.B) {
for i := 0; i < b.N; i++ {
fp384Sqr(z, x)
}
})
b.Run("Inv", func(b *testing.B) {
for i := 0; i < b.N; i++ {
fp384Inv(z, x)
}
})
}
|
