pkcs1v15_test.go

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package rsa
     6  
     7  import (
     8  	"bytes"
     9  	"crypto"
    10  	"crypto/rand"
    11  	"crypto/sha1"
    12  	"crypto/sha256"
    13  	"encoding/base64"
    14  	"encoding/hex"
    15  	"io"
    16  	"math/big"
    17  	"testing"
    18  	"testing/quick"
    19  )
    20  
    21  func decodeBase64(in string) []byte {
    22  	out := make([]byte, base64.StdEncoding.DecodedLen(len(in)))
    23  	n, err := base64.StdEncoding.Decode(out, []byte(in))
    24  	if err != nil {
    25  		return nil
    26  	}
    27  	return out[0:n]
    28  }
    29  
    30  type DecryptPKCS1v15Test struct {
    31  	in, out string
    32  }
    33  
    34  // These test vectors were generated with `openssl rsautl -pkcs -encrypt`
    35  var decryptPKCS1v15Tests = []DecryptPKCS1v15Test{
    36  	{
    37  		"gIcUIoVkD6ATMBk/u/nlCZCCWRKdkfjCgFdo35VpRXLduiKXhNz1XupLLzTXAybEq15juc+EgY5o0DHv/nt3yg==",
    38  		"x",
    39  	},
    40  	{
    41  		"Y7TOCSqofGhkRb+jaVRLzK8xw2cSo1IVES19utzv6hwvx+M8kFsoWQm5DzBeJCZTCVDPkTpavUuEbgp8hnUGDw==",
    42  		"testing.",
    43  	},
    44  	{
    45  		"arReP9DJtEVyV2Dg3dDp4c/PSk1O6lxkoJ8HcFupoRorBZG+7+1fDAwT1olNddFnQMjmkb8vxwmNMoTAT/BFjQ==",
    46  		"testing.\n",
    47  	},
    48  	{
    49  		"WtaBXIoGC54+vH0NH0CHHE+dRDOsMc/6BrfFu2lEqcKL9+uDuWaf+Xj9mrbQCjjZcpQuX733zyok/jsnqe/Ftw==",
    50  		"01234567890123456789012345678901234567890123456789012",
    51  	},
    52  }
    53  
    54  func TestDecryptPKCS1v15(t *testing.T) {
    55  	decryptionFuncs := []func([]byte) ([]byte, error){
    56  		func(ciphertext []byte) (plaintext []byte, err error) {
    57  			return DecryptPKCS1v15(nil, rsaPrivateKey, ciphertext)
    58  		},
    59  		func(ciphertext []byte) (plaintext []byte, err error) {
    60  			return rsaPrivateKey.Decrypt(nil, ciphertext, nil)
    61  		},
    62  	}
    63  
    64  	for _, decryptFunc := range decryptionFuncs {
    65  		for i, test := range decryptPKCS1v15Tests {
    66  			out, err := decryptFunc(decodeBase64(test.in))
    67  			if err != nil {
    68  				t.Errorf("#%d error decrypting", i)
    69  			}
    70  			want := []byte(test.out)
    71  			if !bytes.Equal(out, want) {
    72  				t.Errorf("#%d got:%#v want:%#v", i, out, want)
    73  			}
    74  		}
    75  	}
    76  }
    77  
    78  func TestEncryptPKCS1v15(t *testing.T) {
    79  	random := rand.Reader
    80  	k := (rsaPrivateKey.N.BitLen() + 7) / 8
    81  
    82  	tryEncryptDecrypt := func(in []byte, blind bool) bool {
    83  		if len(in) > k-11 {
    84  			in = in[0 : k-11]
    85  		}
    86  
    87  		ciphertext, err := EncryptPKCS1v15(random, &rsaPrivateKey.PublicKey, in)
    88  		if err != nil {
    89  			t.Errorf("error encrypting: %s", err)
    90  			return false
    91  		}
    92  
    93  		var rand io.Reader
    94  		if !blind {
    95  			rand = nil
    96  		} else {
    97  			rand = random
    98  		}
    99  		plaintext, err := DecryptPKCS1v15(rand, rsaPrivateKey, ciphertext)
   100  		if err != nil {
   101  			t.Errorf("error decrypting: %s", err)
   102  			return false
   103  		}
   104  
   105  		if !bytes.Equal(plaintext, in) {
   106  			t.Errorf("output mismatch: %#v %#v", plaintext, in)
   107  			return false
   108  		}
   109  		return true
   110  	}
   111  
   112  	config := new(quick.Config)
   113  	if testing.Short() {
   114  		config.MaxCount = 10
   115  	}
   116  	quick.Check(tryEncryptDecrypt, config)
   117  }
   118  
   119  // These test vectors were generated with `openssl rsautl -pkcs -encrypt`
   120  var decryptPKCS1v15SessionKeyTests = []DecryptPKCS1v15Test{
   121  	{
   122  		"e6ukkae6Gykq0fKzYwULpZehX+UPXYzMoB5mHQUDEiclRbOTqas4Y0E6nwns1BBpdvEJcilhl5zsox/6DtGsYg==",
   123  		"1234",
   124  	},
   125  	{
   126  		"Dtis4uk/q/LQGGqGk97P59K03hkCIVFMEFZRgVWOAAhxgYpCRG0MX2adptt92l67IqMki6iVQyyt0TtX3IdtEw==",
   127  		"FAIL",
   128  	},
   129  	{
   130  		"LIyFyCYCptPxrvTxpol8F3M7ZivlMsf53zs0vHRAv+rDIh2YsHS69ePMoPMe3TkOMZ3NupiL3takPxIs1sK+dw==",
   131  		"abcd",
   132  	},
   133  	{
   134  		"bafnobel46bKy76JzqU/RIVOH0uAYvzUtauKmIidKgM0sMlvobYVAVQPeUQ/oTGjbIZ1v/6Gyi5AO4DtHruGdw==",
   135  		"FAIL",
   136  	},
   137  }
   138  
   139  func TestEncryptPKCS1v15SessionKey(t *testing.T) {
   140  	for i, test := range decryptPKCS1v15SessionKeyTests {
   141  		key := []byte("FAIL")
   142  		err := DecryptPKCS1v15SessionKey(nil, rsaPrivateKey, decodeBase64(test.in), key)
   143  		if err != nil {
   144  			t.Errorf("#%d error decrypting", i)
   145  		}
   146  		want := []byte(test.out)
   147  		if !bytes.Equal(key, want) {
   148  			t.Errorf("#%d got:%#v want:%#v", i, key, want)
   149  		}
   150  	}
   151  }
   152  
   153  func TestEncryptPKCS1v15DecrypterSessionKey(t *testing.T) {
   154  	for i, test := range decryptPKCS1v15SessionKeyTests {
   155  		plaintext, err := rsaPrivateKey.Decrypt(rand.Reader, decodeBase64(test.in), &PKCS1v15DecryptOptions{SessionKeyLen: 4})
   156  		if err != nil {
   157  			t.Fatalf("#%d: error decrypting: %s", i, err)
   158  		}
   159  		if len(plaintext) != 4 {
   160  			t.Fatalf("#%d: incorrect length plaintext: got %d, want 4", i, len(plaintext))
   161  		}
   162  
   163  		if test.out != "FAIL" && !bytes.Equal(plaintext, []byte(test.out)) {
   164  			t.Errorf("#%d: incorrect plaintext: got %x, want %x", i, plaintext, test.out)
   165  		}
   166  	}
   167  }
   168  
   169  func TestNonZeroRandomBytes(t *testing.T) {
   170  	random := rand.Reader
   171  
   172  	b := make([]byte, 512)
   173  	err := nonZeroRandomBytes(b, random)
   174  	if err != nil {
   175  		t.Errorf("returned error: %s", err)
   176  	}
   177  	for _, b := range b {
   178  		if b == 0 {
   179  			t.Errorf("Zero octet found")
   180  			return
   181  		}
   182  	}
   183  }
   184  
   185  type signPKCS1v15Test struct {
   186  	in, out string
   187  }
   188  
   189  // These vectors have been tested with
   190  //   `openssl rsautl -verify -inkey pk -in signature | hexdump -C`
   191  var signPKCS1v15Tests = []signPKCS1v15Test{
   192  	{"Test.\n", "a4f3fa6ea93bcdd0c57be020c1193ecbfd6f200a3d95c409769b029578fa0e336ad9a347600e40d3ae823b8c7e6bad88cc07c1d54c3a1523cbbb6d58efc362ae"},
   193  }
   194  
   195  func TestSignPKCS1v15(t *testing.T) {
   196  	for i, test := range signPKCS1v15Tests {
   197  		h := sha1.New()
   198  		h.Write([]byte(test.in))
   199  		digest := h.Sum(nil)
   200  
   201  		s, err := SignPKCS1v15(nil, rsaPrivateKey, crypto.SHA1, digest)
   202  		if err != nil {
   203  			t.Errorf("#%d %s", i, err)
   204  		}
   205  
   206  		expected, _ := hex.DecodeString(test.out)
   207  		if !bytes.Equal(s, expected) {
   208  			t.Errorf("#%d got: %x want: %x", i, s, expected)
   209  		}
   210  	}
   211  }
   212  
   213  func TestVerifyPKCS1v15(t *testing.T) {
   214  	for i, test := range signPKCS1v15Tests {
   215  		h := sha1.New()
   216  		h.Write([]byte(test.in))
   217  		digest := h.Sum(nil)
   218  
   219  		sig, _ := hex.DecodeString(test.out)
   220  
   221  		err := VerifyPKCS1v15(&rsaPrivateKey.PublicKey, crypto.SHA1, digest, sig)
   222  		if err != nil {
   223  			t.Errorf("#%d %s", i, err)
   224  		}
   225  	}
   226  }
   227  
   228  func TestOverlongMessagePKCS1v15(t *testing.T) {
   229  	ciphertext := decodeBase64("fjOVdirUzFoLlukv80dBllMLjXythIf22feqPrNo0YoIjzyzyoMFiLjAc/Y4krkeZ11XFThIrEvw\nkRiZcCq5ng==")
   230  	_, err := DecryptPKCS1v15(nil, rsaPrivateKey, ciphertext)
   231  	if err == nil {
   232  		t.Error("RSA decrypted a message that was too long.")
   233  	}
   234  }
   235  
   236  func TestUnpaddedSignature(t *testing.T) {
   237  	msg := []byte("Thu Dec 19 18:06:16 EST 2013\n")
   238  	// This base64 value was generated with:
   239  	// % echo Thu Dec 19 18:06:16 EST 2013 > /tmp/msg
   240  	// % openssl rsautl -sign -inkey key -out /tmp/sig -in /tmp/msg
   241  	//
   242  	// Where "key" contains the RSA private key given at the bottom of this
   243  	// file.
   244  	expectedSig := decodeBase64("pX4DR8azytjdQ1rtUiC040FjkepuQut5q2ZFX1pTjBrOVKNjgsCDyiJDGZTCNoh9qpXYbhl7iEym30BWWwuiZg==")
   245  
   246  	sig, err := SignPKCS1v15(nil, rsaPrivateKey, crypto.Hash(0), msg)
   247  	if err != nil {
   248  		t.Fatalf("SignPKCS1v15 failed: %s", err)
   249  	}
   250  	if !bytes.Equal(sig, expectedSig) {
   251  		t.Fatalf("signature is not expected value: got %x, want %x", sig, expectedSig)
   252  	}
   253  	if err := VerifyPKCS1v15(&rsaPrivateKey.PublicKey, crypto.Hash(0), msg, sig); err != nil {
   254  		t.Fatalf("signature failed to verify: %s", err)
   255  	}
   256  }
   257  
   258  func TestShortSessionKey(t *testing.T) {
   259  	// This tests that attempting to decrypt a session key where the
   260  	// ciphertext is too small doesn't run outside the array bounds.
   261  	ciphertext, err := EncryptPKCS1v15(rand.Reader, &rsaPrivateKey.PublicKey, []byte{1})
   262  	if err != nil {
   263  		t.Fatalf("Failed to encrypt short message: %s", err)
   264  	}
   265  
   266  	var key [32]byte
   267  	if err := DecryptPKCS1v15SessionKey(nil, rsaPrivateKey, ciphertext, key[:]); err != nil {
   268  		t.Fatalf("Failed to decrypt short message: %s", err)
   269  	}
   270  
   271  	for _, v := range key {
   272  		if v != 0 {
   273  			t.Fatal("key was modified when ciphertext was invalid")
   274  		}
   275  	}
   276  }
   277  
   278  // In order to generate new test vectors you'll need the PEM form of this key (and s/TESTING/PRIVATE/):
   279  // -----BEGIN RSA TESTING KEY-----
   280  // MIIBOgIBAAJBALKZD0nEffqM1ACuak0bijtqE2QrI/KLADv7l3kK3ppMyCuLKoF0
   281  // fd7Ai2KW5ToIwzFofvJcS/STa6HA5gQenRUCAwEAAQJBAIq9amn00aS0h/CrjXqu
   282  // /ThglAXJmZhOMPVn4eiu7/ROixi9sex436MaVeMqSNf7Ex9a8fRNfWss7Sqd9eWu
   283  // RTUCIQDasvGASLqmjeffBNLTXV2A5g4t+kLVCpsEIZAycV5GswIhANEPLmax0ME/
   284  // EO+ZJ79TJKN5yiGBRsv5yvx5UiHxajEXAiAhAol5N4EUyq6I9w1rYdhPMGpLfk7A
   285  // IU2snfRJ6Nq2CQIgFrPsWRCkV+gOYcajD17rEqmuLrdIRexpg8N1DOSXoJ8CIGlS
   286  // tAboUGBxTDq3ZroNism3DaMIbKPyYrAqhKov1h5V
   287  // -----END RSA TESTING KEY-----
   288  
   289  var rsaPrivateKey = &PrivateKey{
   290  	PublicKey: PublicKey{
   291  		N: fromBase10("9353930466774385905609975137998169297361893554149986716853295022578535724979677252958524466350471210367835187480748268864277464700638583474144061408845077"),
   292  		E: 65537,
   293  	},
   294  	D: fromBase10("7266398431328116344057699379749222532279343923819063639497049039389899328538543087657733766554155839834519529439851673014800261285757759040931985506583861"),
   295  	Primes: []*big.Int{
   296  		fromBase10("98920366548084643601728869055592650835572950932266967461790948584315647051443"),
   297  		fromBase10("94560208308847015747498523884063394671606671904944666360068158221458669711639"),
   298  	},
   299  }
   300  
   301  func TestShortPKCS1v15Signature(t *testing.T) {
   302  	pub := &PublicKey{
   303  		E: 65537,
   304  		N: fromBase10("8272693557323587081220342447407965471608219912416565371060697606400726784709760494166080686904546560026343451112103559482851304715739629410219358933351333"),
   305  	}
   306  	sig, err := hex.DecodeString("193a310d0dcf64094c6e3a00c8219b80ded70535473acff72c08e1222974bb24a93a535b1dc4c59fc0e65775df7ba2007dd20e9193f4c4025a18a7070aee93")
   307  	if err != nil {
   308  		t.Fatalf("failed to decode signature: %s", err)
   309  	}
   310  
   311  	h := sha256.Sum256([]byte("hello"))
   312  	err = VerifyPKCS1v15(pub, crypto.SHA256, h[:], sig)
   313  	if err == nil {
   314  		t.Fatal("VerifyPKCS1v15 accepted a truncated signature")
   315  	}
   316  }
   317
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