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package x25519
import (
"crypto/rand"
"encoding/hex"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"testing"
"github.com/cloudflare/circl/internal/test"
)
func hexStr2Key(k *Key, s string) {
b, err := hex.DecodeString(s)
if err != nil {
panic("Can't convert string to key")
}
copy(k[:], b)
}
// Indicates whether long tests should be run
var runLongTest = flag.Bool("long", false, "runs longer tests")
type katVector struct {
Public string `json:"input"`
Shared string `json:"output"`
Private string `json:"scalar"`
}
func TestRFC7748Kat(t *testing.T) {
const nameFile = "testdata/rfc7748_kat_test.json"
var kat []katVector
jsonFile, err := os.Open(nameFile)
if err != nil {
t.Fatalf("File %v can not be opened. Error: %v", nameFile, err)
}
defer jsonFile.Close()
input, _ := ioutil.ReadAll(jsonFile)
err = json.Unmarshal(input, &kat)
if err != nil {
t.Fatalf("File %v can not be loaded. Error: %v", nameFile, err)
}
var priv, pub, got, want Key
for _, v := range kat {
hexStr2Key(&pub, v.Public)
hexStr2Key(&priv, v.Private)
Shared(&got, &priv, &pub)
hexStr2Key(&want, v.Shared)
if got != want {
test.ReportError(t, got, want, v)
}
}
}
type katTimes struct {
Times uint32 `json:"times"`
Key string `json:"key"`
}
func TestRFC7748Times(t *testing.T) {
const nameFile = "testdata/rfc7748_times_test.json"
jsonFile, err := os.Open(nameFile)
if err != nil {
t.Fatalf("File %v can not be opened. Error: %v", nameFile, err)
}
defer jsonFile.Close()
input, _ := ioutil.ReadAll(jsonFile)
var kat []katTimes
err = json.Unmarshal(input, &kat)
if err != nil {
t.Fatalf("File %v can not be loaded. Error: %v", nameFile, err)
}
var got, want Key
for _, v := range kat {
if !*runLongTest && v.Times == uint32(1000000) {
t.Log("Skipped one long test, add -long flag to run longer tests")
continue
}
u := Key{9}
k := u
r := u
for i := uint32(0); i < v.Times; i++ {
Shared(&r, &k, &u)
u = k
k = r
}
got = k
hexStr2Key(&want, v.Key)
if got != want {
test.ReportError(t, got, want, v.Times)
}
}
}
func TestBase(t *testing.T) {
testTimes := 1 << 10
var got, want, secret Key
gen := Key{9}
for i := 0; i < testTimes; i++ {
_, _ = io.ReadFull(rand.Reader, secret[:])
KeyGen(&got, &secret)
Shared(&want, &secret, &gen)
if got != want {
test.ReportError(t, got, want, secret)
}
}
}
func TestWycheproof(t *testing.T) {
// Test vectors from Wycheproof v0.4.12
const nameFile = "testdata/wycheproof_kat.json"
jsonFile, err := os.Open(nameFile)
if err != nil {
t.Fatalf("File %v can not be opened. Error: %v", nameFile, err)
}
defer jsonFile.Close()
input, _ := ioutil.ReadAll(jsonFile)
var vecRaw []struct {
TcID int `json:"tcId"`
Comment string `json:"comment"`
Curve string `json:"curve"`
Public string `json:"public"`
Private string `json:"private"`
Shared string `json:"shared"`
Result string `json:"result"`
Flags []string `json:"flags"`
}
err = json.Unmarshal(input, &vecRaw)
if err != nil {
t.Fatalf("File %v can not be loaded. Error: %v", nameFile, err)
}
var got, want, priv, pub Key
for _, v := range vecRaw {
hexStr2Key(&pub, v.Public)
hexStr2Key(&priv, v.Private)
hexStr2Key(&want, v.Shared)
ok := Shared(&got, &priv, &pub)
if got != want {
test.ReportError(t, got, want, v.TcID, priv, pub)
}
if !ok && v.Result != "acceptable" {
test.ReportError(t, got, want, v.TcID, priv, pub)
}
}
}
func BenchmarkX25519(b *testing.B) {
var x, y, z Key
_, _ = io.ReadFull(rand.Reader, x[:])
_, _ = io.ReadFull(rand.Reader, y[:])
_, _ = io.ReadFull(rand.Reader, z[:])
b.Run("KeyGen", func(b *testing.B) {
for i := 0; i < b.N; i++ {
KeyGen(&x, &y)
}
})
b.Run("Shared", func(b *testing.B) {
for i := 0; i < b.N; i++ {
Shared(&z, &x, &y)
}
})
}
func Example_x25519() {
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
okA := Shared(&AliceShared, &AliceSecret, &BobPublic)
// Deriving Bob's shared key
okB := Shared(&BobShared, &BobSecret, &AlicePublic)
fmt.Println(AliceShared == BobShared && okA && okB)
// Output: true
}
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