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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wycheproof
import (
"bytes"
"crypto/ecdh"
"fmt"
"testing"
)
func TestECDHStdLib(t *testing.T) {
type ECDHTestVector struct {
// A brief description of the test case
Comment string `json:"comment,omitempty"`
// A list of flags
Flags []string `json:"flags,omitempty"`
// the private key
Private string `json:"private,omitempty"`
// Encoded public key
Public string `json:"public,omitempty"`
// Test result
Result string `json:"result,omitempty"`
// The shared secret key
Shared string `json:"shared,omitempty"`
// Identifier of the test case
TcID int `json:"tcId,omitempty"`
}
type ECDHTestGroup struct {
Curve string `json:"curve,omitempty"`
Tests []*ECDHTestVector `json:"tests,omitempty"`
}
type Root struct {
TestGroups []*ECDHTestGroup `json:"testGroups,omitempty"`
}
flagsShouldPass := map[string]bool{
// We don't support compressed points.
"CompressedPoint": false,
// We don't support decoding custom curves.
"UnnamedCurve": false,
// WrongOrder and UnusedParam are only found with UnnamedCurve.
"WrongOrder": false,
"UnusedParam": false,
// X25519 specific flags
"Twist": true,
"SmallPublicKey": false,
"LowOrderPublic": false,
"ZeroSharedSecret": false,
"NonCanonicalPublic": true,
}
// curveToCurve is a map of all elliptic curves supported
// by crypto/elliptic, which can subsequently be parsed and tested.
curveToCurve := map[string]ecdh.Curve{
"secp256r1": ecdh.P256(),
"secp384r1": ecdh.P384(),
"secp521r1": ecdh.P521(),
"curve25519": ecdh.X25519(),
}
curveToKeySize := map[string]int{
"secp256r1": 32,
"secp384r1": 48,
"secp521r1": 66,
"curve25519": 32,
}
for _, f := range []string{
"ecdh_secp256r1_ecpoint_test.json",
"ecdh_secp384r1_ecpoint_test.json",
"ecdh_secp521r1_ecpoint_test.json",
"x25519_test.json",
} {
var root Root
readTestVector(t, f, &root)
for _, tg := range root.TestGroups {
if _, ok := curveToCurve[tg.Curve]; !ok {
continue
}
for _, tt := range tg.Tests {
tg, tt := tg, tt
t.Run(fmt.Sprintf("%s/%d", tg.Curve, tt.TcID), func(t *testing.T) {
t.Logf("Type: %v", tt.Result)
t.Logf("Flags: %q", tt.Flags)
t.Log(tt.Comment)
shouldPass := shouldPass(tt.Result, tt.Flags, flagsShouldPass)
curve := curveToCurve[tg.Curve]
p := decodeHex(tt.Public)
pub, err := curve.NewPublicKey(p)
if err != nil {
if shouldPass {
t.Errorf("NewPublicKey: %v", err)
}
return
}
privBytes := decodeHex(tt.Private)
if len(privBytes) != curveToKeySize[tg.Curve] {
t.Skipf("non-standard key size %d", len(privBytes))
}
priv, err := curve.NewPrivateKey(privBytes)
if err != nil {
if shouldPass {
t.Errorf("NewPrivateKey: %v", err)
}
return
}
shared := decodeHex(tt.Shared)
x, err := priv.ECDH(pub)
if err != nil {
if tg.Curve == "curve25519" && !shouldPass {
// ECDH is expected to only return an error when using X25519,
// in all other cases an error is unexpected.
return
}
t.Fatalf("ECDH: %v", err)
}
if bytes.Equal(shared, x) != shouldPass {
if shouldPass {
t.Errorf("ECDH = %x, want %x", shared, x)
} else {
t.Errorf("ECDH = %x, want anything else", shared)
}
}
})
}
}
}
}