// Copyright 2009 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 rsa
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/sha1"
"encoding/base64"
"encoding/hex"
"io"
"math/big"
"testing"
"testing/quick"
)
func decodeBase64(in string) []byte {
out := make([]byte, base64.StdEncoding.DecodedLen(len(in)))
n, err := base64.StdEncoding.Decode(out, []byte(in))
if err != nil {
return nil
}
return out[0:n]
}
type DecryptPKCS1v15Test struct {
in, out string
}
// These test vectors were generated with `openssl rsautl -pkcs -encrypt`
var decryptPKCS1v15Tests = []DecryptPKCS1v15Test{
{
"gIcUIoVkD6ATMBk/u/nlCZCCWRKdkfjCgFdo35VpRXLduiKXhNz1XupLLzTXAybEq15juc+EgY5o0DHv/nt3yg==",
"x",
},
{
"Y7TOCSqofGhkRb+jaVRLzK8xw2cSo1IVES19utzv6hwvx+M8kFsoWQm5DzBeJCZTCVDPkTpavUuEbgp8hnUGDw==",
"testing.",
},
{
"arReP9DJtEVyV2Dg3dDp4c/PSk1O6lxkoJ8HcFupoRorBZG+7+1fDAwT1olNddFnQMjmkb8vxwmNMoTAT/BFjQ==",
"testing.\n",
},
{
"WtaBXIoGC54+vH0NH0CHHE+dRDOsMc/6BrfFu2lEqcKL9+uDuWaf+Xj9mrbQCjjZcpQuX733zyok/jsnqe/Ftw==",
"01234567890123456789012345678901234567890123456789012",
},
}
func TestDecryptPKCS1v15(t *testing.T) {
decryptionFuncs := []func([]byte) ([]byte, error){
func(ciphertext []byte) (plaintext []byte, err error) {
return DecryptPKCS1v15(nil, rsaPrivateKey, ciphertext)
},
func(ciphertext []byte) (plaintext []byte, err error) {
return rsaPrivateKey.Decrypt(nil, ciphertext, nil)
},
}
for _, decryptFunc := range decryptionFuncs {
for i, test := range decryptPKCS1v15Tests {
out, err := decryptFunc(decodeBase64(test.in))
if err != nil {
t.Errorf("#%d error decrypting", i)
}
want := []byte(test.out)
if !bytes.Equal(out, want) {
t.Errorf("#%d got:%#v want:%#v", i, out, want)
}
}
}
}
func TestEncryptPKCS1v15(t *testing.T) {
random := rand.Reader
k := (rsaPrivateKey.N.BitLen() + 7) / 8
tryEncryptDecrypt := func(in []byte, blind bool) bool {
if len(in) > k-11 {
in = in[0 : k-11]
}
ciphertext, err := EncryptPKCS1v15(random, &rsaPrivateKey.PublicKey, in)
if err != nil {
t.Errorf("error encrypting: %s", err)
return false
}
var rand io.Reader
if !blind {
rand = nil
} else {
rand = random
}
plaintext, err := DecryptPKCS1v15(rand, rsaPrivateKey, ciphertext)
if err != nil {
t.Errorf("error decrypting: %s", err)
return false
}
if !bytes.Equal(plaintext, in) {
t.Errorf("output mismatch: %#v %#v", plaintext, in)
return false
}
return true
}
config := new(quick.Config)
if testing.Short() {
config.MaxCount = 10
}
quick.Check(tryEncryptDecrypt, config)
}
// These test vectors were generated with `openssl rsautl -pkcs -encrypt`
var decryptPKCS1v15SessionKeyTests = []DecryptPKCS1v15Test{
{
"e6ukkae6Gykq0fKzYwULpZehX+UPXYzMoB5mHQUDEiclRbOTqas4Y0E6nwns1BBpdvEJcilhl5zsox/6DtGsYg==",
"1234",
},
{
"Dtis4uk/q/LQGGqGk97P59K03hkCIVFMEFZRgVWOAAhxgYpCRG0MX2adptt92l67IqMki6iVQyyt0TtX3IdtEw==",
"FAIL",
},
{
"LIyFyCYCptPxrvTxpol8F3M7ZivlMsf53zs0vHRAv+rDIh2YsHS69ePMoPMe3TkOMZ3NupiL3takPxIs1sK+dw==",
"abcd",
},
{
"bafnobel46bKy76JzqU/RIVOH0uAYvzUtauKmIidKgM0sMlvobYVAVQPeUQ/oTGjbIZ1v/6Gyi5AO4DtHruGdw==",
"FAIL",
},
}
func TestEncryptPKCS1v15SessionKey(t *testing.T) {
for i, test := range decryptPKCS1v15SessionKeyTests {
key := []byte("FAIL")
err := DecryptPKCS1v15SessionKey(nil, rsaPrivateKey, decodeBase64(test.in), key)
if err != nil {
t.Errorf("#%d error decrypting", i)
}
want := []byte(test.out)
if !bytes.Equal(key, want) {
t.Errorf("#%d got:%#v want:%#v", i, key, want)
}
}
}
func TestEncryptPKCS1v15DecrypterSessionKey(t *testing.T) {
for i, test := range decryptPKCS1v15SessionKeyTests {
plaintext, err := rsaPrivateKey.Decrypt(rand.Reader, decodeBase64(test.in), &PKCS1v15DecryptOptions{SessionKeyLen: 4})
if err != nil {
t.Fatalf("#%d: error decrypting: %s", i, err)
}
if len(plaintext) != 4 {
t.Fatalf("#%d: incorrect length plaintext: got %d, want 4", i, len(plaintext))
}
if test.out != "FAIL" && !bytes.Equal(plaintext, []byte(test.out)) {
t.Errorf("#%d: incorrect plaintext: got %x, want %x", i, plaintext, test.out)
}
}
}
func TestNonZeroRandomBytes(t *testing.T) {
random := rand.Reader
b := make([]byte, 512)
err := nonZeroRandomBytes(b, random)
if err != nil {
t.Errorf("returned error: %s", err)
}
for _, b := range b {
if b == 0 {
t.Errorf("Zero octet found")
return
}
}
}
type signPKCS1v15Test struct {
in, out string
}
// These vectors have been tested with
// `openssl rsautl -verify -inkey pk -in signature | hexdump -C`
var signPKCS1v15Tests = []signPKCS1v15Test{
{"Test.\n", "a4f3fa6ea93bcdd0c57be020c1193ecbfd6f200a3d95c409769b029578fa0e336ad9a347600e40d3ae823b8c7e6bad88cc07c1d54c3a1523cbbb6d58efc362ae"},
}
func TestSignPKCS1v15(t *testing.T) {
for i, test := range signPKCS1v15Tests {
h := sha1.New()
h.Write([]byte(test.in))
digest := h.Sum(nil)
s, err := SignPKCS1v15(nil, rsaPrivateKey, crypto.SHA1, digest)
if err != nil {
t.Errorf("#%d %s", i, err)
}
expected, _ := hex.DecodeString(test.out)
if !bytes.Equal(s, expected) {
t.Errorf("#%d got: %x want: %x", i, s, expected)
}
}
}
func TestVerifyPKCS1v15(t *testing.T) {
for i, test := range signPKCS1v15Tests {
h := sha1.New()
h.Write([]byte(test.in))
digest := h.Sum(nil)
sig, _ := hex.DecodeString(test.out)
err := VerifyPKCS1v15(&rsaPrivateKey.PublicKey, crypto.SHA1, digest, sig)
if err != nil {
t.Errorf("#%d %s", i, err)
}
}
}
func TestOverlongMessagePKCS1v15(t *testing.T) {
ciphertext := decodeBase64("fjOVdirUzFoLlukv80dBllMLjXythIf22feqPrNo0YoIjzyzyoMFiLjAc/Y4krkeZ11XFThIrEvw\nkRiZcCq5ng==")
_, err := DecryptPKCS1v15(nil, rsaPrivateKey, ciphertext)
if err == nil {
t.Error("RSA decrypted a message that was too long.")
}
}
func TestUnpaddedSignature(t *testing.T) {
msg := []byte("Thu Dec 19 18:06:16 EST 2013\n")
// This base64 value was generated with:
// % echo Thu Dec 19 18:06:16 EST 2013 > /tmp/msg
// % openssl rsautl -sign -inkey key -out /tmp/sig -in /tmp/msg
//
// Where "key" contains the RSA private key given at the bottom of this
// file.
expectedSig := decodeBase64("pX4DR8azytjdQ1rtUiC040FjkepuQut5q2ZFX1pTjBrOVKNjgsCDyiJDGZTCNoh9qpXYbhl7iEym30BWWwuiZg==")
sig, err := SignPKCS1v15(nil, rsaPrivateKey, crypto.Hash(0), msg)
if err != nil {
t.Fatalf("SignPKCS1v15 failed: %s", err)
}
if !bytes.Equal(sig, expectedSig) {
t.Fatalf("signature is not expected value: got %x, want %x", sig, expectedSig)
}
if err := VerifyPKCS1v15(&rsaPrivateKey.PublicKey, crypto.Hash(0), msg, sig); err != nil {
t.Fatalf("signature failed to verify: %s", err)
}
}
func TestShortSessionKey(t *testing.T) {
// This tests that attempting to decrypt a session key where the
// ciphertext is too small doesn't run outside the array bounds.
ciphertext, err := EncryptPKCS1v15(rand.Reader, &rsaPrivateKey.PublicKey, []byte{1})
if err != nil {
t.Fatalf("Failed to encrypt short message: %s", err)
}
var key [32]byte
if err := DecryptPKCS1v15SessionKey(nil, rsaPrivateKey, ciphertext, key[:]); err != nil {
t.Fatalf("Failed to decrypt short message: %s", err)
}
for _, v := range key {
if v != 0 {
t.Fatal("key was modified when ciphertext was invalid")
}
}
}
// In order to generate new test vectors you'll need the PEM form of this key:
// -----BEGIN RSA PRIVATE KEY-----
// MIIBOgIBAAJBALKZD0nEffqM1ACuak0bijtqE2QrI/KLADv7l3kK3ppMyCuLKoF0
// fd7Ai2KW5ToIwzFofvJcS/STa6HA5gQenRUCAwEAAQJBAIq9amn00aS0h/CrjXqu
// /ThglAXJmZhOMPVn4eiu7/ROixi9sex436MaVeMqSNf7Ex9a8fRNfWss7Sqd9eWu
// RTUCIQDasvGASLqmjeffBNLTXV2A5g4t+kLVCpsEIZAycV5GswIhANEPLmax0ME/
// EO+ZJ79TJKN5yiGBRsv5yvx5UiHxajEXAiAhAol5N4EUyq6I9w1rYdhPMGpLfk7A
// IU2snfRJ6Nq2CQIgFrPsWRCkV+gOYcajD17rEqmuLrdIRexpg8N1DOSXoJ8CIGlS
// tAboUGBxTDq3ZroNism3DaMIbKPyYrAqhKov1h5V
// -----END RSA PRIVATE KEY-----
var rsaPrivateKey = &PrivateKey{
PublicKey: PublicKey{
N: fromBase10("9353930466774385905609975137998169297361893554149986716853295022578535724979677252958524466350471210367835187480748268864277464700638583474144061408845077"),
E: 65537,
},
D: fromBase10("7266398431328116344057699379749222532279343923819063639497049039389899328538543087657733766554155839834519529439851673014800261285757759040931985506583861"),
Primes: []*big.Int{
fromBase10("98920366548084643601728869055592650835572950932266967461790948584315647051443"),
fromBase10("94560208308847015747498523884063394671606671904944666360068158221458669711639"),
},
}