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publickey_test.go
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publickey_test.go
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// Copyright 2021 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cryptoutils
import (
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"strings"
"testing"
"github.com/google/go-cmp/cmp"
)
func verifyPublicKeyPEMRoundtrip(t *testing.T, pub crypto.PublicKey) {
t.Helper()
pemBytes, err := MarshalPublicKeyToPEM(pub)
if err != nil {
t.Fatalf("MarshalPublicKeyToPEM returned error: %v", err)
}
rtPub, err := UnmarshalPEMToPublicKey(pemBytes)
if err != nil {
t.Fatalf("UnmarshalPEMToPublicKey returned error: %v", err)
}
if d := cmp.Diff(pub, rtPub); d != "" {
t.Errorf("round-tripped public key was malformed (-before +after): %s", d)
}
}
func TestECDSAPublicKeyPEMRoundtrip(t *testing.T) {
t.Parallel()
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
t.Fatalf("ecdsa.GenerateKey failed: %v", err)
}
verifyPublicKeyPEMRoundtrip(t, priv.Public())
}
func TestEd25519PublicKeyPEMRoundtrip(t *testing.T) {
t.Parallel()
pub, _, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
t.Fatalf("ed25519.GenerateKey failed: %v", err)
}
verifyPublicKeyPEMRoundtrip(t, pub)
}
func TestRSAPublicKeyPEMRoundtrip(t *testing.T) {
t.Parallel()
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
t.Fatalf("rsa.GenerateKey failed: %v", err)
}
verifyPublicKeyPEMRoundtrip(t, priv.Public())
}
func TestSKIDRSA(t *testing.T) {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
t.Fatalf("rsa.GenerateKey failed: %v", err)
}
skid, err := SKID(priv.Public())
if err != nil {
t.Fatalf("SKID failed: %v", err)
}
// Expect SKID is 160 bits (20 bytes)
if len(skid) != 20 {
t.Fatalf("SKID failed: %v", skid)
}
}
func TestSKIDECDSA(t *testing.T) {
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
t.Fatalf("ecdsa.GenerateKey failed: %v", err)
}
skid, err := SKID(priv.Public())
if err != nil {
t.Fatalf("SKID failed: %v", err)
}
// Expect SKID is 160 bits (20 bytes)
if len(skid) != 20 {
t.Fatalf("SKID failed: %v", skid)
}
}
func TestSKIDED25519(t *testing.T) {
pub, _, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
t.Fatalf("ed25519.GenerateKey failed: %v", err)
}
skid, err := SKID(pub)
if err != nil {
t.Fatalf("SKID failed: %v", err)
}
// Expect SKID is 160 bits (20 bytes)
if len(skid) != 20 {
t.Fatalf("SKID failed: %v", skid)
}
}
func TestEqualKeys(t *testing.T) {
// Test RSA (success and failure)
privRsa, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
t.Fatalf("rsa.GenerateKey failed: %v", err)
}
privRsa2, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
t.Fatalf("rsa.GenerateKey failed: %v", err)
}
if err := EqualKeys(privRsa.Public(), privRsa.Public()); err != nil {
t.Fatalf("unexpected error for rsa equality, got %v", err)
}
if err := EqualKeys(privRsa.Public(), privRsa2.Public()); err == nil || !strings.Contains(err.Error(), "rsa public keys are not equal") {
t.Fatalf("expected error for different rsa keys, got %v", err)
}
// Test ECDSA (success and failure)
privEcdsa, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
t.Fatalf("ecdsa.GenerateKey failed: %v", err)
}
privEcdsa2, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
t.Fatalf("ecdsa.GenerateKey failed: %v", err)
}
if err := EqualKeys(privEcdsa.Public(), privEcdsa.Public()); err != nil {
t.Fatalf("unexpected error for ecdsa equality, got %v", err)
}
if err := EqualKeys(privEcdsa.Public(), privEcdsa2.Public()); err == nil || !strings.Contains(err.Error(), "ecdsa public keys are not equal") {
t.Fatalf("expected error for different ecdsa keys, got %v", err)
}
// Test ED25519 (success and failure)
pubEd, _, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
t.Fatalf("ed25519.GenerateKey failed: %v", err)
}
pubEd2, _, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
t.Fatalf("ed25519.GenerateKey failed: %v", err)
}
if err := EqualKeys(pubEd, pubEd); err != nil {
t.Fatalf("unexpected error for ed25519 equality, got %v", err)
}
if err := EqualKeys(pubEd, pubEd2); err == nil || !strings.Contains(err.Error(), "ed25519 public keys are not equal") {
t.Fatalf("expected error for different ed25519 keys, got %v", err)
}
// Keys of different type are not equal
if err := EqualKeys(privRsa.Public(), pubEd); err == nil || !strings.Contains(err.Error(), "are not equal") {
t.Fatalf("expected error for different key types, got %v", err)
}
// Fails with unexpected key type
type PublicKey struct{}
if err := EqualKeys(PublicKey{}, PublicKey{}); err == nil || err.Error() != "unsupported key type" {
t.Fatalf("expected error for unsupported key type, got %v", err)
}
}
func TestValidatePubKeyUnsupported(t *testing.T) {
// Fails with unexpected key type
type PublicKey struct{}
err := ValidatePubKey(PublicKey{})
if err == nil || err.Error() != "unsupported public key type" {
t.Errorf("expected unsupported public key type, got %v", err)
}
}
func TestValidatePubKeyRsa(t *testing.T) {
// Validate common RSA key sizes
for _, bits := range []int{2048, 3072, 4096} {
priv, err := rsa.GenerateKey(rand.Reader, bits)
if err != nil {
t.Fatalf("rsa.GenerateKey failed: %v", err)
}
if err := ValidatePubKey(priv.Public()); err != nil {
t.Errorf("unexpected error validating public key: %v", err)
}
}
// Fails with small key size
priv, err := rsa.GenerateKey(rand.Reader, 1024)
if err != nil {
t.Fatalf("rsa.GenerateKey failed: %v", err)
}
if err := ValidatePubKey(priv.Public()); err == nil || err.Error() != "key too small: 1024" {
t.Errorf("expected rsa key size too small, got %v", err)
}
// Fails with large key size
priv, err = rsa.GenerateKey(rand.Reader, 5000)
if err != nil {
t.Fatalf("rsa.GenerateKey failed: %v", err)
}
if err := ValidatePubKey(priv.Public()); err == nil || err.Error() != "key too large: 5000 > 4096" {
t.Errorf("expected rsa key size too large, got %v", err)
}
// Fails with key size that's not a multiple of 8
priv, err = rsa.GenerateKey(rand.Reader, 4095)
if err != nil {
t.Fatalf("rsa.GenerateKey failed: %v", err)
}
if err := ValidatePubKey(priv.Public()); err == nil || err.Error() != "key length wasn't a multiple of 8: 4095" {
t.Errorf("expected rsa key multiple error, got %v", err)
}
}
func TestValidatePubKeyEcdsa(t *testing.T) {
for _, curve := range []elliptic.Curve{elliptic.P256(), elliptic.P384(), elliptic.P521()} {
priv, err := ecdsa.GenerateKey(curve, rand.Reader)
if err != nil {
t.Fatalf("ecdsa.GenerateKey failed: %v", err)
}
if err := ValidatePubKey(priv.Public()); err != nil {
t.Errorf("unexpected error validating public key: %v", err)
}
}
// Fails with smalller curve
priv, err := ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
if err != nil {
t.Fatalf("ecdsa.GenerateKey failed: %v", err)
}
if err := ValidatePubKey(priv.Public()); err == nil || err.Error() != "unsupported ec curve, expected NIST P-256, P-384, or P-521" {
t.Errorf("expected unsupported curve, got %v", err)
}
// Fails with unknown curve
err = ValidatePubKey(&ecdsa.PublicKey{})
if err == nil || err.Error() != "unexpected ec curve" {
t.Errorf("expected unexpected curve, got %v", err)
}
}
func TestValidatePubKeyEd25519(t *testing.T) {
pub, _, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
t.Fatalf("ed25519.GenerateKey failed: %v", err)
}
if err := ValidatePubKey(pub); err != nil {
t.Errorf("unexpected error validating public key: %v", err)
}
// Only success, ED25519 keys do not support customization
}