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Source file src/crypto/rsa/pkcs1v15_test.go

Documentation: crypto/rsa

  // 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"),
  	},
  }
  

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