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// Copyright 2020 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 ecdsa_test
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"testing"
)
func testEqual(t *testing.T, c elliptic.Curve) {
private, _ := ecdsa.GenerateKey(c, rand.Reader)
public := &private.PublicKey
if !public.Equal(public) {
t.Errorf("public key is not equal to itself: %v", public)
}
if !public.Equal(crypto.Signer(private).Public().(*ecdsa.PublicKey)) {
t.Errorf("private.Public() is not Equal to public: %q", public)
}
if !private.Equal(private) {
t.Errorf("private key is not equal to itself: %v", private)
}
enc, err := x509.MarshalPKCS8PrivateKey(private)
if err != nil {
t.Fatal(err)
}
decoded, err := x509.ParsePKCS8PrivateKey(enc)
if err != nil {
t.Fatal(err)
}
if !public.Equal(decoded.(crypto.Signer).Public()) {
t.Errorf("public key is not equal to itself after decoding: %v", public)
}
if !private.Equal(decoded) {
t.Errorf("private key is not equal to itself after decoding: %v", private)
}
other, _ := ecdsa.GenerateKey(c, rand.Reader)
if public.Equal(other.Public()) {
t.Errorf("different public keys are Equal")
}
if private.Equal(other) {
t.Errorf("different private keys are Equal")
}
// Ensure that keys with the same coordinates but on different curves
// aren't considered Equal.
differentCurve := &ecdsa.PublicKey{}
*differentCurve = *public // make a copy of the public key
if differentCurve.Curve == elliptic.P256() {
differentCurve.Curve = elliptic.P224()
} else {
differentCurve.Curve = elliptic.P256()
}
if public.Equal(differentCurve) {
t.Errorf("public keys with different curves are Equal")
}
}
func TestEqual(t *testing.T) {
t.Run("P224", func(t *testing.T) { testEqual(t, elliptic.P224()) })
if testing.Short() {
return
}
t.Run("P256", func(t *testing.T) { testEqual(t, elliptic.P256()) })
t.Run("P384", func(t *testing.T) { testEqual(t, elliptic.P384()) })
t.Run("P521", func(t *testing.T) { testEqual(t, elliptic.P521()) })
}