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package curve4q
import (
"bytes"
"crypto/rand"
"fmt"
"io"
"testing"
"github.com/cloudflare/circl/ecc/fourq"
"github.com/cloudflare/circl/internal/test"
)
func TestDH(t *testing.T) {
var secretAlice, publicAlice, sharedAlice Key
var secretBob, publicBob, sharedBob Key
testTimes := 1 << 10
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(secretAlice[:])
_, _ = rand.Read(secretBob[:])
KeyGen(&publicAlice, &secretAlice)
KeyGen(&publicBob, &secretBob)
if ok := Shared(&sharedAlice, &secretAlice, &publicBob); !ok {
test.ReportError(t, ok, true, secretAlice, publicBob)
}
if ok := Shared(&sharedBob, &secretBob, &publicAlice); !ok {
test.ReportError(t, ok, true, secretBob, publicAlice)
}
got := sharedAlice
want := sharedBob
if !bytes.Equal(got[:], want[:]) {
test.ReportError(t, got, want, secretAlice, secretBob)
}
}
}
func TestDHLowOrder(t *testing.T) {
var secretAlice, validPublicAlice, invalidPublicAlice, sharedAlice Key
var secretBob, publicBob, sharedBob Key
t.Run("zeroPoint", func(t *testing.T) {
testTimes := 1 << 10
for i := 0; i < testTimes; i++ {
_, _ = rand.Read(secretAlice[:])
_, _ = rand.Read(secretBob[:])
KeyGen(&validPublicAlice, &secretAlice)
KeyGen(&publicBob, &secretBob)
zeroPoint := fourq.Point{}
zeroPoint.SetIdentity()
zeroPoint.Marshal((*[Size]byte)(&invalidPublicAlice))
ok := Shared(&sharedAlice, &secretAlice, &publicBob)
test.CheckOk(ok, "shared must not fail", t)
ok = Shared(&sharedBob, &secretBob, &validPublicAlice)
test.CheckOk(ok, "shared must not fail", t)
invalid := Shared(&sharedBob, &secretBob, &invalidPublicAlice)
test.CheckOk(!invalid, "shared must fail", t)
}
})
t.Run("lowOrderPoint", func(t *testing.T) {
KeyGen(&validPublicAlice, &secretAlice)
KeyGen(&publicBob, &secretBob)
// Point of order 56
lowOrderPoint := fourq.Point{
X: fourq.Fq{
fourq.Fp{0xc0, 0xe5, 0x21, 0x04, 0xaa, 0xe1, 0x93, 0xd8, 0x9b, 0x50, 0x42, 0x54, 0xd6, 0x46, 0x86, 0x74},
fourq.Fp{0x21, 0x25, 0x4d, 0x9a, 0xda, 0x8f, 0xad, 0x28, 0xa2, 0x3d, 0xfd, 0x02, 0x13, 0xea, 0xd2, 0x56},
},
Y: fourq.Fq{
fourq.Fp{0xaf, 0x71, 0xe4, 0x3b, 0x22, 0x21, 0x41, 0xef, 0x12, 0xba, 0x67, 0x02, 0x57, 0x1, 0xe5, 0x58},
fourq.Fp{0x0e, 0x1a, 0xf5, 0xe5, 0xb8, 0x24, 0x9c, 0xe0, 0xed, 0xc3, 0xc4, 0x69, 0x7, 0x32, 0x8e, 0x2c},
},
}
ok := lowOrderPoint.IsOnCurve()
test.CheckOk(ok, "point is on curve", t)
lowOrderPoint.Marshal((*[Size]byte)(&invalidPublicAlice))
invalid := Shared(&sharedBob, &secretBob, &invalidPublicAlice)
test.CheckOk(!invalid, "shared must fail", t)
})
}
func BenchmarkDH(b *testing.B) {
var secret, public, shared Key
_, _ = rand.Read(secret[:])
_, _ = rand.Read(public[:])
b.Run("keygen", func(b *testing.B) {
for i := 0; i < b.N; i++ {
KeyGen(&public, &secret)
}
})
b.Run("shared", func(b *testing.B) {
for i := 0; i < b.N; i++ {
Shared(&shared, &secret, &public)
}
})
}
func ExampleKey() {
var AliceSecret, BobSecret,
AlicePublic, BobPublic,
AliceShared, BobShared Key
// Generating Alice's secret and public keys
_, _ = io.ReadFull(rand.Reader, AliceSecret[:])
KeyGen(&AlicePublic, &AliceSecret)
// Generating Bob's secret and public keys
_, _ = io.ReadFull(rand.Reader, BobSecret[:])
KeyGen(&BobPublic, &BobSecret)
// Deriving Alice's shared key
Shared(&AliceShared, &AliceSecret, &BobPublic)
// Deriving Bob's shared key
Shared(&BobShared, &BobSecret, &AlicePublic)
fmt.Println(AliceShared == BobShared)
// Output: true
}
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