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_test
     6  
     7  import (
     8  	"bytes"
     9  	"crypto"
    10  	"crypto/rand"
    11  	. "crypto/rsa"
    12  	"crypto/sha1"
    13  	"crypto/sha256"
    14  	"crypto/x509"
    15  	"encoding/base64"
    16  	"encoding/hex"
    17  	"encoding/pem"
    18  	"io"
    19  	"testing"
    20  	"testing/quick"
    21  )
    22  
    23  func decodeBase64(in string) []byte {
    24  	out := make([]byte, base64.StdEncoding.DecodedLen(len(in)))
    25  	n, err := base64.StdEncoding.Decode(out, []byte(in))
    26  	if err != nil {
    27  		return nil
    28  	}
    29  	return out[0:n]
    30  }
    31  
    32  type DecryptPKCS1v15Test struct {
    33  	in, out string
    34  }
    35  
    36  // These test vectors were generated with `openssl rsautl -pkcs -encrypt`
    37  var decryptPKCS1v15Tests = []DecryptPKCS1v15Test{
    38  	{
    39  		"gIcUIoVkD6ATMBk/u/nlCZCCWRKdkfjCgFdo35VpRXLduiKXhNz1XupLLzTXAybEq15juc+EgY5o0DHv/nt3yg==",
    40  		"x",
    41  	},
    42  	{
    43  		"Y7TOCSqofGhkRb+jaVRLzK8xw2cSo1IVES19utzv6hwvx+M8kFsoWQm5DzBeJCZTCVDPkTpavUuEbgp8hnUGDw==",
    44  		"testing.",
    45  	},
    46  	{
    47  		"arReP9DJtEVyV2Dg3dDp4c/PSk1O6lxkoJ8HcFupoRorBZG+7+1fDAwT1olNddFnQMjmkb8vxwmNMoTAT/BFjQ==",
    48  		"testing.\n",
    49  	},
    50  	{
    51  		"WtaBXIoGC54+vH0NH0CHHE+dRDOsMc/6BrfFu2lEqcKL9+uDuWaf+Xj9mrbQCjjZcpQuX733zyok/jsnqe/Ftw==",
    52  		"01234567890123456789012345678901234567890123456789012",
    53  	},
    54  }
    55  
    56  func TestDecryptPKCS1v15(t *testing.T) {
    57  	t.Setenv("GODEBUG", "rsa1024min=0")
    58  
    59  	decryptionFuncs := []func([]byte) ([]byte, error){
    60  		func(ciphertext []byte) (plaintext []byte, err error) {
    61  			return DecryptPKCS1v15(nil, test512Key, ciphertext)
    62  		},
    63  		func(ciphertext []byte) (plaintext []byte, err error) {
    64  			return test512Key.Decrypt(nil, ciphertext, nil)
    65  		},
    66  	}
    67  
    68  	for _, decryptFunc := range decryptionFuncs {
    69  		for i, test := range decryptPKCS1v15Tests {
    70  			out, err := decryptFunc(decodeBase64(test.in))
    71  			if err != nil {
    72  				t.Errorf("#%d error decrypting: %v", i, err)
    73  			}
    74  			want := []byte(test.out)
    75  			if !bytes.Equal(out, want) {
    76  				t.Errorf("#%d got:%#v want:%#v", i, out, want)
    77  			}
    78  		}
    79  	}
    80  }
    81  
    82  func TestEncryptPKCS1v15(t *testing.T) {
    83  	random := rand.Reader
    84  	k := (rsaPrivateKey.N.BitLen() + 7) / 8
    85  
    86  	tryEncryptDecrypt := func(in []byte, blind bool) bool {
    87  		if len(in) > k-11 {
    88  			in = in[0 : k-11]
    89  		}
    90  
    91  		ciphertext, err := EncryptPKCS1v15(random, &rsaPrivateKey.PublicKey, in)
    92  		if err != nil {
    93  			t.Errorf("error encrypting: %s", err)
    94  			return false
    95  		}
    96  
    97  		var rand io.Reader
    98  		if !blind {
    99  			rand = nil
   100  		} else {
   101  			rand = random
   102  		}
   103  		plaintext, err := DecryptPKCS1v15(rand, rsaPrivateKey, ciphertext)
   104  		if err != nil {
   105  			t.Errorf("error decrypting: %s", err)
   106  			return false
   107  		}
   108  
   109  		if !bytes.Equal(plaintext, in) {
   110  			t.Errorf("output mismatch: %#v %#v", plaintext, in)
   111  			return false
   112  		}
   113  		return true
   114  	}
   115  
   116  	config := new(quick.Config)
   117  	if testing.Short() {
   118  		config.MaxCount = 10
   119  	}
   120  	quick.Check(tryEncryptDecrypt, config)
   121  }
   122  
   123  // These test vectors were generated with `openssl rsautl -pkcs -encrypt`
   124  var decryptPKCS1v15SessionKeyTests = []DecryptPKCS1v15Test{
   125  	{
   126  		"e6ukkae6Gykq0fKzYwULpZehX+UPXYzMoB5mHQUDEiclRbOTqas4Y0E6nwns1BBpdvEJcilhl5zsox/6DtGsYg==",
   127  		"1234",
   128  	},
   129  	{
   130  		"Dtis4uk/q/LQGGqGk97P59K03hkCIVFMEFZRgVWOAAhxgYpCRG0MX2adptt92l67IqMki6iVQyyt0TtX3IdtEw==",
   131  		"FAIL",
   132  	},
   133  	{
   134  		"LIyFyCYCptPxrvTxpol8F3M7ZivlMsf53zs0vHRAv+rDIh2YsHS69ePMoPMe3TkOMZ3NupiL3takPxIs1sK+dw==",
   135  		"abcd",
   136  	},
   137  	{
   138  		"bafnobel46bKy76JzqU/RIVOH0uAYvzUtauKmIidKgM0sMlvobYVAVQPeUQ/oTGjbIZ1v/6Gyi5AO4DtHruGdw==",
   139  		"FAIL",
   140  	},
   141  }
   142  
   143  func TestEncryptPKCS1v15SessionKey(t *testing.T) {
   144  	t.Setenv("GODEBUG", "rsa1024min=0")
   145  	for i, test := range decryptPKCS1v15SessionKeyTests {
   146  		key := []byte("FAIL")
   147  		err := DecryptPKCS1v15SessionKey(nil, test512Key, decodeBase64(test.in), key)
   148  		if err != nil {
   149  			t.Errorf("#%d error decrypting", i)
   150  		}
   151  		want := []byte(test.out)
   152  		if !bytes.Equal(key, want) {
   153  			t.Errorf("#%d got:%#v want:%#v", i, key, want)
   154  		}
   155  	}
   156  }
   157  
   158  func TestEncryptPKCS1v15DecrypterSessionKey(t *testing.T) {
   159  	t.Setenv("GODEBUG", "rsa1024min=0")
   160  	for i, test := range decryptPKCS1v15SessionKeyTests {
   161  		plaintext, err := test512Key.Decrypt(rand.Reader, decodeBase64(test.in), &PKCS1v15DecryptOptions{SessionKeyLen: 4})
   162  		if err != nil {
   163  			t.Fatalf("#%d: error decrypting: %s", i, err)
   164  		}
   165  		if len(plaintext) != 4 {
   166  			t.Fatalf("#%d: incorrect length plaintext: got %d, want 4", i, len(plaintext))
   167  		}
   168  
   169  		if test.out != "FAIL" && !bytes.Equal(plaintext, []byte(test.out)) {
   170  			t.Errorf("#%d: incorrect plaintext: got %x, want %x", i, plaintext, test.out)
   171  		}
   172  	}
   173  }
   174  
   175  func TestNonZeroRandomBytes(t *testing.T) {
   176  	random := rand.Reader
   177  
   178  	b := make([]byte, 512)
   179  	err := NonZeroRandomBytes(b, random)
   180  	if err != nil {
   181  		t.Errorf("returned error: %s", err)
   182  	}
   183  	for _, b := range b {
   184  		if b == 0 {
   185  			t.Errorf("Zero octet found")
   186  			return
   187  		}
   188  	}
   189  }
   190  
   191  type signPKCS1v15Test struct {
   192  	in, out string
   193  }
   194  
   195  // These vectors have been tested with
   196  //
   197  //	`openssl rsautl -verify -inkey pk -in signature | hexdump -C`
   198  var signPKCS1v15Tests = []signPKCS1v15Test{
   199  	{"Test.\n", "a4f3fa6ea93bcdd0c57be020c1193ecbfd6f200a3d95c409769b029578fa0e336ad9a347600e40d3ae823b8c7e6bad88cc07c1d54c3a1523cbbb6d58efc362ae"},
   200  }
   201  
   202  func TestSignPKCS1v15(t *testing.T) {
   203  	t.Setenv("GODEBUG", "rsa1024min=0")
   204  	for i, test := range signPKCS1v15Tests {
   205  		h := sha1.New()
   206  		h.Write([]byte(test.in))
   207  		digest := h.Sum(nil)
   208  
   209  		s, err := SignPKCS1v15(nil, test512Key, crypto.SHA1, digest)
   210  		if err != nil {
   211  			t.Errorf("#%d %s", i, err)
   212  		}
   213  
   214  		expected, _ := hex.DecodeString(test.out)
   215  		if !bytes.Equal(s, expected) {
   216  			t.Errorf("#%d got: %x want: %x", i, s, expected)
   217  		}
   218  	}
   219  }
   220  
   221  func TestVerifyPKCS1v15(t *testing.T) {
   222  	t.Setenv("GODEBUG", "rsa1024min=0")
   223  	for i, test := range signPKCS1v15Tests {
   224  		h := sha1.New()
   225  		h.Write([]byte(test.in))
   226  		digest := h.Sum(nil)
   227  
   228  		sig, _ := hex.DecodeString(test.out)
   229  
   230  		err := VerifyPKCS1v15(&test512Key.PublicKey, crypto.SHA1, digest, sig)
   231  		if err != nil {
   232  			t.Errorf("#%d %s", i, err)
   233  		}
   234  	}
   235  }
   236  
   237  func TestOverlongMessagePKCS1v15(t *testing.T) {
   238  	t.Setenv("GODEBUG", "rsa1024min=0")
   239  	ciphertext := decodeBase64("fjOVdirUzFoLlukv80dBllMLjXythIf22feqPrNo0YoIjzyzyoMFiLjAc/Y4krkeZ11XFThIrEvw\nkRiZcCq5ng==")
   240  	_, err := DecryptPKCS1v15(nil, test512Key, ciphertext)
   241  	if err == nil {
   242  		t.Error("RSA decrypted a message that was too long.")
   243  	}
   244  }
   245  
   246  func TestUnpaddedSignature(t *testing.T) {
   247  	t.Setenv("GODEBUG", "rsa1024min=0")
   248  
   249  	msg := []byte("Thu Dec 19 18:06:16 EST 2013\n")
   250  	// This base64 value was generated with:
   251  	// % echo Thu Dec 19 18:06:16 EST 2013 > /tmp/msg
   252  	// % openssl rsautl -sign -inkey key -out /tmp/sig -in /tmp/msg
   253  	//
   254  	// Where "key" contains the RSA private key given at the bottom of this
   255  	// file.
   256  	expectedSig := decodeBase64("pX4DR8azytjdQ1rtUiC040FjkepuQut5q2ZFX1pTjBrOVKNjgsCDyiJDGZTCNoh9qpXYbhl7iEym30BWWwuiZg==")
   257  
   258  	sig, err := SignPKCS1v15(nil, test512Key, crypto.Hash(0), msg)
   259  	if err != nil {
   260  		t.Fatalf("SignPKCS1v15 failed: %s", err)
   261  	}
   262  	if !bytes.Equal(sig, expectedSig) {
   263  		t.Fatalf("signature is not expected value: got %x, want %x", sig, expectedSig)
   264  	}
   265  	if err := VerifyPKCS1v15(&test512Key.PublicKey, crypto.Hash(0), msg, sig); err != nil {
   266  		t.Fatalf("signature failed to verify: %s", err)
   267  	}
   268  }
   269  
   270  func TestShortSessionKey(t *testing.T) {
   271  	// This tests that attempting to decrypt a session key where the
   272  	// ciphertext is too small doesn't run outside the array bounds.
   273  	ciphertext, err := EncryptPKCS1v15(rand.Reader, &rsaPrivateKey.PublicKey, []byte{1})
   274  	if err != nil {
   275  		t.Fatalf("Failed to encrypt short message: %s", err)
   276  	}
   277  
   278  	var key [32]byte
   279  	if err := DecryptPKCS1v15SessionKey(nil, rsaPrivateKey, ciphertext, key[:]); err != nil {
   280  		t.Fatalf("Failed to decrypt short message: %s", err)
   281  	}
   282  
   283  	for _, v := range key {
   284  		if v != 0 {
   285  			t.Fatal("key was modified when ciphertext was invalid")
   286  		}
   287  	}
   288  }
   289  
   290  func parsePublicKey(s string) *PublicKey {
   291  	p, _ := pem.Decode([]byte(s))
   292  	k, err := x509.ParsePKCS1PublicKey(p.Bytes)
   293  	if err != nil {
   294  		panic(err)
   295  	}
   296  	return k
   297  }
   298  
   299  func TestShortPKCS1v15Signature(t *testing.T) {
   300  	pub := parsePublicKey(`-----BEGIN RSA PUBLIC KEY-----
   301  MEgCQQCd9BVzo775lkohasxjnefF1nCMcNoibqIWEVDe/K7M2GSoO4zlSQB+gkix
   302  O3AnTcdHB51iaZpWfxPSnew8yfulAgMBAAE=
   303  -----END RSA PUBLIC KEY-----`)
   304  	sig, err := hex.DecodeString("193a310d0dcf64094c6e3a00c8219b80ded70535473acff72c08e1222974bb24a93a535b1dc4c59fc0e65775df7ba2007dd20e9193f4c4025a18a7070aee93")
   305  	if err != nil {
   306  		t.Fatalf("failed to decode signature: %s", err)
   307  	}
   308  
   309  	h := sha256.Sum256([]byte("hello"))
   310  	err = VerifyPKCS1v15(pub, crypto.SHA256, h[:], sig)
   311  	if err == nil {
   312  		t.Fatal("VerifyPKCS1v15 accepted a truncated signature")
   313  	}
   314  }
   315
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