Source file src/crypto/tls/tls_test.go

Documentation: crypto/tls

		 1  // Copyright 2012 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 tls
		 6  
		 7  import (
		 8  	"bytes"
		 9  	"context"
		10  	"crypto"
		11  	"crypto/x509"
		12  	"encoding/json"
		13  	"errors"
		14  	"fmt"
		15  	"internal/testenv"
		16  	"io"
		17  	"math"
		18  	"net"
		19  	"os"
		20  	"reflect"
		21  	"sort"
		22  	"strings"
		23  	"testing"
		24  	"time"
		25  )
		26  
		27  var rsaCertPEM = `-----BEGIN CERTIFICATE-----
		28  MIIB0zCCAX2gAwIBAgIJAI/M7BYjwB+uMA0GCSqGSIb3DQEBBQUAMEUxCzAJBgNV
		29  BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
		30  aWRnaXRzIFB0eSBMdGQwHhcNMTIwOTEyMjE1MjAyWhcNMTUwOTEyMjE1MjAyWjBF
		31  MQswCQYDVQQGEwJBVTETMBEGA1UECAwKU29tZS1TdGF0ZTEhMB8GA1UECgwYSW50
		32  ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBANLJ
		33  hPHhITqQbPklG3ibCVxwGMRfp/v4XqhfdQHdcVfHap6NQ5Wok/4xIA+ui35/MmNa
		34  rtNuC+BdZ1tMuVCPFZcCAwEAAaNQME4wHQYDVR0OBBYEFJvKs8RfJaXTH08W+SGv
		35  zQyKn0H8MB8GA1UdIwQYMBaAFJvKs8RfJaXTH08W+SGvzQyKn0H8MAwGA1UdEwQF
		36  MAMBAf8wDQYJKoZIhvcNAQEFBQADQQBJlffJHybjDGxRMqaRmDhX0+6v02TUKZsW
		37  r5QuVbpQhH6u+0UgcW0jp9QwpxoPTLTWGXEWBBBurxFwiCBhkQ+V
		38  -----END CERTIFICATE-----
		39  `
		40  
		41  var rsaKeyPEM = testingKey(`-----BEGIN RSA TESTING KEY-----
		42  MIIBOwIBAAJBANLJhPHhITqQbPklG3ibCVxwGMRfp/v4XqhfdQHdcVfHap6NQ5Wo
		43  k/4xIA+ui35/MmNartNuC+BdZ1tMuVCPFZcCAwEAAQJAEJ2N+zsR0Xn8/Q6twa4G
		44  6OB1M1WO+k+ztnX/1SvNeWu8D6GImtupLTYgjZcHufykj09jiHmjHx8u8ZZB/o1N
		45  MQIhAPW+eyZo7ay3lMz1V01WVjNKK9QSn1MJlb06h/LuYv9FAiEA25WPedKgVyCW
		46  SmUwbPw8fnTcpqDWE3yTO3vKcebqMSsCIBF3UmVue8YU3jybC3NxuXq3wNm34R8T
		47  xVLHwDXh/6NJAiEAl2oHGGLz64BuAfjKrqwz7qMYr9HCLIe/YsoWq/olzScCIQDi
		48  D2lWusoe2/nEqfDVVWGWlyJ7yOmqaVm/iNUN9B2N2g==
		49  -----END RSA TESTING KEY-----
		50  `)
		51  
		52  // keyPEM is the same as rsaKeyPEM, but declares itself as just
		53  // "PRIVATE KEY", not "RSA PRIVATE KEY".	https://golang.org/issue/4477
		54  var keyPEM = testingKey(`-----BEGIN TESTING KEY-----
		55  MIIBOwIBAAJBANLJhPHhITqQbPklG3ibCVxwGMRfp/v4XqhfdQHdcVfHap6NQ5Wo
		56  k/4xIA+ui35/MmNartNuC+BdZ1tMuVCPFZcCAwEAAQJAEJ2N+zsR0Xn8/Q6twa4G
		57  6OB1M1WO+k+ztnX/1SvNeWu8D6GImtupLTYgjZcHufykj09jiHmjHx8u8ZZB/o1N
		58  MQIhAPW+eyZo7ay3lMz1V01WVjNKK9QSn1MJlb06h/LuYv9FAiEA25WPedKgVyCW
		59  SmUwbPw8fnTcpqDWE3yTO3vKcebqMSsCIBF3UmVue8YU3jybC3NxuXq3wNm34R8T
		60  xVLHwDXh/6NJAiEAl2oHGGLz64BuAfjKrqwz7qMYr9HCLIe/YsoWq/olzScCIQDi
		61  D2lWusoe2/nEqfDVVWGWlyJ7yOmqaVm/iNUN9B2N2g==
		62  -----END TESTING KEY-----
		63  `)
		64  
		65  var ecdsaCertPEM = `-----BEGIN CERTIFICATE-----
		66  MIIB/jCCAWICCQDscdUxw16XFDAJBgcqhkjOPQQBMEUxCzAJBgNVBAYTAkFVMRMw
		67  EQYDVQQIEwpTb21lLVN0YXRlMSEwHwYDVQQKExhJbnRlcm5ldCBXaWRnaXRzIFB0
		68  eSBMdGQwHhcNMTIxMTE0MTI0MDQ4WhcNMTUxMTE0MTI0MDQ4WjBFMQswCQYDVQQG
		69  EwJBVTETMBEGA1UECBMKU29tZS1TdGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lk
		70  Z2l0cyBQdHkgTHRkMIGbMBAGByqGSM49AgEGBSuBBAAjA4GGAAQBY9+my9OoeSUR
		71  lDQdV/x8LsOuLilthhiS1Tz4aGDHIPwC1mlvnf7fg5lecYpMCrLLhauAc1UJXcgl
		72  01xoLuzgtAEAgv2P/jgytzRSpUYvgLBt1UA0leLYBy6mQQbrNEuqT3INapKIcUv8
		73  XxYP0xMEUksLPq6Ca+CRSqTtrd/23uTnapkwCQYHKoZIzj0EAQOBigAwgYYCQXJo
		74  A7Sl2nLVf+4Iu/tAX/IF4MavARKC4PPHK3zfuGfPR3oCCcsAoz3kAzOeijvd0iXb
		75  H5jBImIxPL4WxQNiBTexAkF8D1EtpYuWdlVQ80/h/f4pBcGiXPqX5h2PQSQY7hP1
		76  +jwM1FGS4fREIOvlBYr/SzzQRtwrvrzGYxDEDbsC0ZGRnA==
		77  -----END CERTIFICATE-----
		78  `
		79  
		80  var ecdsaKeyPEM = testingKey(`-----BEGIN EC PARAMETERS-----
		81  BgUrgQQAIw==
		82  -----END EC PARAMETERS-----
		83  -----BEGIN EC TESTING KEY-----
		84  MIHcAgEBBEIBrsoKp0oqcv6/JovJJDoDVSGWdirrkgCWxrprGlzB9o0X8fV675X0
		85  NwuBenXFfeZvVcwluO7/Q9wkYoPd/t3jGImgBwYFK4EEACOhgYkDgYYABAFj36bL
		86  06h5JRGUNB1X/Hwuw64uKW2GGJLVPPhoYMcg/ALWaW+d/t+DmV5xikwKssuFq4Bz
		87  VQldyCXTXGgu7OC0AQCC/Y/+ODK3NFKlRi+AsG3VQDSV4tgHLqZBBus0S6pPcg1q
		88  kohxS/xfFg/TEwRSSws+roJr4JFKpO2t3/be5OdqmQ==
		89  -----END EC TESTING KEY-----
		90  `)
		91  
		92  var keyPairTests = []struct {
		93  	algo string
		94  	cert string
		95  	key	string
		96  }{
		97  	{"ECDSA", ecdsaCertPEM, ecdsaKeyPEM},
		98  	{"RSA", rsaCertPEM, rsaKeyPEM},
		99  	{"RSA-untyped", rsaCertPEM, keyPEM}, // golang.org/issue/4477
	 100  }
	 101  
	 102  func TestX509KeyPair(t *testing.T) {
	 103  	t.Parallel()
	 104  	var pem []byte
	 105  	for _, test := range keyPairTests {
	 106  		pem = []byte(test.cert + test.key)
	 107  		if _, err := X509KeyPair(pem, pem); err != nil {
	 108  			t.Errorf("Failed to load %s cert followed by %s key: %s", test.algo, test.algo, err)
	 109  		}
	 110  		pem = []byte(test.key + test.cert)
	 111  		if _, err := X509KeyPair(pem, pem); err != nil {
	 112  			t.Errorf("Failed to load %s key followed by %s cert: %s", test.algo, test.algo, err)
	 113  		}
	 114  	}
	 115  }
	 116  
	 117  func TestX509KeyPairErrors(t *testing.T) {
	 118  	_, err := X509KeyPair([]byte(rsaKeyPEM), []byte(rsaCertPEM))
	 119  	if err == nil {
	 120  		t.Fatalf("X509KeyPair didn't return an error when arguments were switched")
	 121  	}
	 122  	if subStr := "been switched"; !strings.Contains(err.Error(), subStr) {
	 123  		t.Fatalf("Expected %q in the error when switching arguments to X509KeyPair, but the error was %q", subStr, err)
	 124  	}
	 125  
	 126  	_, err = X509KeyPair([]byte(rsaCertPEM), []byte(rsaCertPEM))
	 127  	if err == nil {
	 128  		t.Fatalf("X509KeyPair didn't return an error when both arguments were certificates")
	 129  	}
	 130  	if subStr := "certificate"; !strings.Contains(err.Error(), subStr) {
	 131  		t.Fatalf("Expected %q in the error when both arguments to X509KeyPair were certificates, but the error was %q", subStr, err)
	 132  	}
	 133  
	 134  	const nonsensePEM = `
	 135  -----BEGIN NONSENSE-----
	 136  Zm9vZm9vZm9v
	 137  -----END NONSENSE-----
	 138  `
	 139  
	 140  	_, err = X509KeyPair([]byte(nonsensePEM), []byte(nonsensePEM))
	 141  	if err == nil {
	 142  		t.Fatalf("X509KeyPair didn't return an error when both arguments were nonsense")
	 143  	}
	 144  	if subStr := "NONSENSE"; !strings.Contains(err.Error(), subStr) {
	 145  		t.Fatalf("Expected %q in the error when both arguments to X509KeyPair were nonsense, but the error was %q", subStr, err)
	 146  	}
	 147  }
	 148  
	 149  func TestX509MixedKeyPair(t *testing.T) {
	 150  	if _, err := X509KeyPair([]byte(rsaCertPEM), []byte(ecdsaKeyPEM)); err == nil {
	 151  		t.Error("Load of RSA certificate succeeded with ECDSA private key")
	 152  	}
	 153  	if _, err := X509KeyPair([]byte(ecdsaCertPEM), []byte(rsaKeyPEM)); err == nil {
	 154  		t.Error("Load of ECDSA certificate succeeded with RSA private key")
	 155  	}
	 156  }
	 157  
	 158  func newLocalListener(t testing.TB) net.Listener {
	 159  	ln, err := net.Listen("tcp", "127.0.0.1:0")
	 160  	if err != nil {
	 161  		ln, err = net.Listen("tcp6", "[::1]:0")
	 162  	}
	 163  	if err != nil {
	 164  		t.Fatal(err)
	 165  	}
	 166  	return ln
	 167  }
	 168  
	 169  func TestDialTimeout(t *testing.T) {
	 170  	if testing.Short() {
	 171  		t.Skip("skipping in short mode")
	 172  	}
	 173  	listener := newLocalListener(t)
	 174  
	 175  	addr := listener.Addr().String()
	 176  	defer listener.Close()
	 177  
	 178  	complete := make(chan bool)
	 179  	defer close(complete)
	 180  
	 181  	go func() {
	 182  		conn, err := listener.Accept()
	 183  		if err != nil {
	 184  			t.Error(err)
	 185  			return
	 186  		}
	 187  		<-complete
	 188  		conn.Close()
	 189  	}()
	 190  
	 191  	dialer := &net.Dialer{
	 192  		Timeout: 10 * time.Millisecond,
	 193  	}
	 194  
	 195  	var err error
	 196  	if _, err = DialWithDialer(dialer, "tcp", addr, nil); err == nil {
	 197  		t.Fatal("DialWithTimeout completed successfully")
	 198  	}
	 199  
	 200  	if !isTimeoutError(err) {
	 201  		t.Errorf("resulting error not a timeout: %v\nType %T: %#v", err, err, err)
	 202  	}
	 203  }
	 204  
	 205  func TestDeadlineOnWrite(t *testing.T) {
	 206  	if testing.Short() {
	 207  		t.Skip("skipping in short mode")
	 208  	}
	 209  
	 210  	ln := newLocalListener(t)
	 211  	defer ln.Close()
	 212  
	 213  	srvCh := make(chan *Conn, 1)
	 214  
	 215  	go func() {
	 216  		sconn, err := ln.Accept()
	 217  		if err != nil {
	 218  			srvCh <- nil
	 219  			return
	 220  		}
	 221  		srv := Server(sconn, testConfig.Clone())
	 222  		if err := srv.Handshake(); err != nil {
	 223  			srvCh <- nil
	 224  			return
	 225  		}
	 226  		srvCh <- srv
	 227  	}()
	 228  
	 229  	clientConfig := testConfig.Clone()
	 230  	clientConfig.MaxVersion = VersionTLS12
	 231  	conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
	 232  	if err != nil {
	 233  		t.Fatal(err)
	 234  	}
	 235  	defer conn.Close()
	 236  
	 237  	srv := <-srvCh
	 238  	if srv == nil {
	 239  		t.Error(err)
	 240  	}
	 241  
	 242  	// Make sure the client/server is setup correctly and is able to do a typical Write/Read
	 243  	buf := make([]byte, 6)
	 244  	if _, err := srv.Write([]byte("foobar")); err != nil {
	 245  		t.Errorf("Write err: %v", err)
	 246  	}
	 247  	if n, err := conn.Read(buf); n != 6 || err != nil || string(buf) != "foobar" {
	 248  		t.Errorf("Read = %d, %v, data %q; want 6, nil, foobar", n, err, buf)
	 249  	}
	 250  
	 251  	// Set a deadline which should cause Write to timeout
	 252  	if err = srv.SetDeadline(time.Now()); err != nil {
	 253  		t.Fatalf("SetDeadline(time.Now()) err: %v", err)
	 254  	}
	 255  	if _, err = srv.Write([]byte("should fail")); err == nil {
	 256  		t.Fatal("Write should have timed out")
	 257  	}
	 258  
	 259  	// Clear deadline and make sure it still times out
	 260  	if err = srv.SetDeadline(time.Time{}); err != nil {
	 261  		t.Fatalf("SetDeadline(time.Time{}) err: %v", err)
	 262  	}
	 263  	if _, err = srv.Write([]byte("This connection is permanently broken")); err == nil {
	 264  		t.Fatal("Write which previously failed should still time out")
	 265  	}
	 266  
	 267  	// Verify the error
	 268  	if ne := err.(net.Error); ne.Temporary() != false {
	 269  		t.Error("Write timed out but incorrectly classified the error as Temporary")
	 270  	}
	 271  	if !isTimeoutError(err) {
	 272  		t.Error("Write timed out but did not classify the error as a Timeout")
	 273  	}
	 274  }
	 275  
	 276  type readerFunc func([]byte) (int, error)
	 277  
	 278  func (f readerFunc) Read(b []byte) (int, error) { return f(b) }
	 279  
	 280  // TestDialer tests that tls.Dialer.DialContext can abort in the middle of a handshake.
	 281  // (The other cases are all handled by the existing dial tests in this package, which
	 282  // all also flow through the same code shared code paths)
	 283  func TestDialer(t *testing.T) {
	 284  	ln := newLocalListener(t)
	 285  	defer ln.Close()
	 286  
	 287  	unblockServer := make(chan struct{}) // close-only
	 288  	defer close(unblockServer)
	 289  	go func() {
	 290  		conn, err := ln.Accept()
	 291  		if err != nil {
	 292  			return
	 293  		}
	 294  		defer conn.Close()
	 295  		<-unblockServer
	 296  	}()
	 297  
	 298  	ctx, cancel := context.WithCancel(context.Background())
	 299  	d := Dialer{Config: &Config{
	 300  		Rand: readerFunc(func(b []byte) (n int, err error) {
	 301  			// By the time crypto/tls wants randomness, that means it has a TCP
	 302  			// connection, so we're past the Dialer's dial and now blocked
	 303  			// in a handshake. Cancel our context and see if we get unstuck.
	 304  			// (Our TCP listener above never reads or writes, so the Handshake
	 305  			// would otherwise be stuck forever)
	 306  			cancel()
	 307  			return len(b), nil
	 308  		}),
	 309  		ServerName: "foo",
	 310  	}}
	 311  	_, err := d.DialContext(ctx, "tcp", ln.Addr().String())
	 312  	if err != context.Canceled {
	 313  		t.Errorf("err = %v; want context.Canceled", err)
	 314  	}
	 315  }
	 316  
	 317  func isTimeoutError(err error) bool {
	 318  	if ne, ok := err.(net.Error); ok {
	 319  		return ne.Timeout()
	 320  	}
	 321  	return false
	 322  }
	 323  
	 324  // tests that Conn.Read returns (non-zero, io.EOF) instead of
	 325  // (non-zero, nil) when a Close (alertCloseNotify) is sitting right
	 326  // behind the application data in the buffer.
	 327  func TestConnReadNonzeroAndEOF(t *testing.T) {
	 328  	// This test is racy: it assumes that after a write to a
	 329  	// localhost TCP connection, the peer TCP connection can
	 330  	// immediately read it. Because it's racy, we skip this test
	 331  	// in short mode, and then retry it several times with an
	 332  	// increasing sleep in between our final write (via srv.Close
	 333  	// below) and the following read.
	 334  	if testing.Short() {
	 335  		t.Skip("skipping in short mode")
	 336  	}
	 337  	var err error
	 338  	for delay := time.Millisecond; delay <= 64*time.Millisecond; delay *= 2 {
	 339  		if err = testConnReadNonzeroAndEOF(t, delay); err == nil {
	 340  			return
	 341  		}
	 342  	}
	 343  	t.Error(err)
	 344  }
	 345  
	 346  func testConnReadNonzeroAndEOF(t *testing.T, delay time.Duration) error {
	 347  	ln := newLocalListener(t)
	 348  	defer ln.Close()
	 349  
	 350  	srvCh := make(chan *Conn, 1)
	 351  	var serr error
	 352  	go func() {
	 353  		sconn, err := ln.Accept()
	 354  		if err != nil {
	 355  			serr = err
	 356  			srvCh <- nil
	 357  			return
	 358  		}
	 359  		serverConfig := testConfig.Clone()
	 360  		srv := Server(sconn, serverConfig)
	 361  		if err := srv.Handshake(); err != nil {
	 362  			serr = fmt.Errorf("handshake: %v", err)
	 363  			srvCh <- nil
	 364  			return
	 365  		}
	 366  		srvCh <- srv
	 367  	}()
	 368  
	 369  	clientConfig := testConfig.Clone()
	 370  	// In TLS 1.3, alerts are encrypted and disguised as application data, so
	 371  	// the opportunistic peek won't work.
	 372  	clientConfig.MaxVersion = VersionTLS12
	 373  	conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
	 374  	if err != nil {
	 375  		t.Fatal(err)
	 376  	}
	 377  	defer conn.Close()
	 378  
	 379  	srv := <-srvCh
	 380  	if srv == nil {
	 381  		return serr
	 382  	}
	 383  
	 384  	buf := make([]byte, 6)
	 385  
	 386  	srv.Write([]byte("foobar"))
	 387  	n, err := conn.Read(buf)
	 388  	if n != 6 || err != nil || string(buf) != "foobar" {
	 389  		return fmt.Errorf("Read = %d, %v, data %q; want 6, nil, foobar", n, err, buf)
	 390  	}
	 391  
	 392  	srv.Write([]byte("abcdef"))
	 393  	srv.Close()
	 394  	time.Sleep(delay)
	 395  	n, err = conn.Read(buf)
	 396  	if n != 6 || string(buf) != "abcdef" {
	 397  		return fmt.Errorf("Read = %d, buf= %q; want 6, abcdef", n, buf)
	 398  	}
	 399  	if err != io.EOF {
	 400  		return fmt.Errorf("Second Read error = %v; want io.EOF", err)
	 401  	}
	 402  	return nil
	 403  }
	 404  
	 405  func TestTLSUniqueMatches(t *testing.T) {
	 406  	ln := newLocalListener(t)
	 407  	defer ln.Close()
	 408  
	 409  	serverTLSUniques := make(chan []byte)
	 410  	parentDone := make(chan struct{})
	 411  	childDone := make(chan struct{})
	 412  	defer close(parentDone)
	 413  	go func() {
	 414  		defer close(childDone)
	 415  		for i := 0; i < 2; i++ {
	 416  			sconn, err := ln.Accept()
	 417  			if err != nil {
	 418  				t.Error(err)
	 419  				return
	 420  			}
	 421  			serverConfig := testConfig.Clone()
	 422  			serverConfig.MaxVersion = VersionTLS12 // TLSUnique is not defined in TLS 1.3
	 423  			srv := Server(sconn, serverConfig)
	 424  			if err := srv.Handshake(); err != nil {
	 425  				t.Error(err)
	 426  				return
	 427  			}
	 428  			select {
	 429  			case <-parentDone:
	 430  				return
	 431  			case serverTLSUniques <- srv.ConnectionState().TLSUnique:
	 432  			}
	 433  		}
	 434  	}()
	 435  
	 436  	clientConfig := testConfig.Clone()
	 437  	clientConfig.ClientSessionCache = NewLRUClientSessionCache(1)
	 438  	conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
	 439  	if err != nil {
	 440  		t.Fatal(err)
	 441  	}
	 442  
	 443  	var serverTLSUniquesValue []byte
	 444  	select {
	 445  	case <-childDone:
	 446  		return
	 447  	case serverTLSUniquesValue = <-serverTLSUniques:
	 448  	}
	 449  
	 450  	if !bytes.Equal(conn.ConnectionState().TLSUnique, serverTLSUniquesValue) {
	 451  		t.Error("client and server channel bindings differ")
	 452  	}
	 453  	conn.Close()
	 454  
	 455  	conn, err = Dial("tcp", ln.Addr().String(), clientConfig)
	 456  	if err != nil {
	 457  		t.Fatal(err)
	 458  	}
	 459  	defer conn.Close()
	 460  	if !conn.ConnectionState().DidResume {
	 461  		t.Error("second session did not use resumption")
	 462  	}
	 463  
	 464  	select {
	 465  	case <-childDone:
	 466  		return
	 467  	case serverTLSUniquesValue = <-serverTLSUniques:
	 468  	}
	 469  
	 470  	if !bytes.Equal(conn.ConnectionState().TLSUnique, serverTLSUniquesValue) {
	 471  		t.Error("client and server channel bindings differ when session resumption is used")
	 472  	}
	 473  }
	 474  
	 475  func TestVerifyHostname(t *testing.T) {
	 476  	testenv.MustHaveExternalNetwork(t)
	 477  
	 478  	c, err := Dial("tcp", "www.google.com:https", nil)
	 479  	if err != nil {
	 480  		t.Fatal(err)
	 481  	}
	 482  	if err := c.VerifyHostname("www.google.com"); err != nil {
	 483  		t.Fatalf("verify www.google.com: %v", err)
	 484  	}
	 485  	if err := c.VerifyHostname("www.yahoo.com"); err == nil {
	 486  		t.Fatalf("verify www.yahoo.com succeeded")
	 487  	}
	 488  
	 489  	c, err = Dial("tcp", "www.google.com:https", &Config{InsecureSkipVerify: true})
	 490  	if err != nil {
	 491  		t.Fatal(err)
	 492  	}
	 493  	if err := c.VerifyHostname("www.google.com"); err == nil {
	 494  		t.Fatalf("verify www.google.com succeeded with InsecureSkipVerify=true")
	 495  	}
	 496  }
	 497  
	 498  func TestConnCloseBreakingWrite(t *testing.T) {
	 499  	ln := newLocalListener(t)
	 500  	defer ln.Close()
	 501  
	 502  	srvCh := make(chan *Conn, 1)
	 503  	var serr error
	 504  	var sconn net.Conn
	 505  	go func() {
	 506  		var err error
	 507  		sconn, err = ln.Accept()
	 508  		if err != nil {
	 509  			serr = err
	 510  			srvCh <- nil
	 511  			return
	 512  		}
	 513  		serverConfig := testConfig.Clone()
	 514  		srv := Server(sconn, serverConfig)
	 515  		if err := srv.Handshake(); err != nil {
	 516  			serr = fmt.Errorf("handshake: %v", err)
	 517  			srvCh <- nil
	 518  			return
	 519  		}
	 520  		srvCh <- srv
	 521  	}()
	 522  
	 523  	cconn, err := net.Dial("tcp", ln.Addr().String())
	 524  	if err != nil {
	 525  		t.Fatal(err)
	 526  	}
	 527  	defer cconn.Close()
	 528  
	 529  	conn := &changeImplConn{
	 530  		Conn: cconn,
	 531  	}
	 532  
	 533  	clientConfig := testConfig.Clone()
	 534  	tconn := Client(conn, clientConfig)
	 535  	if err := tconn.Handshake(); err != nil {
	 536  		t.Fatal(err)
	 537  	}
	 538  
	 539  	srv := <-srvCh
	 540  	if srv == nil {
	 541  		t.Fatal(serr)
	 542  	}
	 543  	defer sconn.Close()
	 544  
	 545  	connClosed := make(chan struct{})
	 546  	conn.closeFunc = func() error {
	 547  		close(connClosed)
	 548  		return nil
	 549  	}
	 550  
	 551  	inWrite := make(chan bool, 1)
	 552  	var errConnClosed = errors.New("conn closed for test")
	 553  	conn.writeFunc = func(p []byte) (n int, err error) {
	 554  		inWrite <- true
	 555  		<-connClosed
	 556  		return 0, errConnClosed
	 557  	}
	 558  
	 559  	closeReturned := make(chan bool, 1)
	 560  	go func() {
	 561  		<-inWrite
	 562  		tconn.Close() // test that this doesn't block forever.
	 563  		closeReturned <- true
	 564  	}()
	 565  
	 566  	_, err = tconn.Write([]byte("foo"))
	 567  	if err != errConnClosed {
	 568  		t.Errorf("Write error = %v; want errConnClosed", err)
	 569  	}
	 570  
	 571  	<-closeReturned
	 572  	if err := tconn.Close(); err != net.ErrClosed {
	 573  		t.Errorf("Close error = %v; want net.ErrClosed", err)
	 574  	}
	 575  }
	 576  
	 577  func TestConnCloseWrite(t *testing.T) {
	 578  	ln := newLocalListener(t)
	 579  	defer ln.Close()
	 580  
	 581  	clientDoneChan := make(chan struct{})
	 582  
	 583  	serverCloseWrite := func() error {
	 584  		sconn, err := ln.Accept()
	 585  		if err != nil {
	 586  			return fmt.Errorf("accept: %v", err)
	 587  		}
	 588  		defer sconn.Close()
	 589  
	 590  		serverConfig := testConfig.Clone()
	 591  		srv := Server(sconn, serverConfig)
	 592  		if err := srv.Handshake(); err != nil {
	 593  			return fmt.Errorf("handshake: %v", err)
	 594  		}
	 595  		defer srv.Close()
	 596  
	 597  		data, err := io.ReadAll(srv)
	 598  		if err != nil {
	 599  			return err
	 600  		}
	 601  		if len(data) > 0 {
	 602  			return fmt.Errorf("Read data = %q; want nothing", data)
	 603  		}
	 604  
	 605  		if err := srv.CloseWrite(); err != nil {
	 606  			return fmt.Errorf("server CloseWrite: %v", err)
	 607  		}
	 608  
	 609  		// Wait for clientCloseWrite to finish, so we know we
	 610  		// tested the CloseWrite before we defer the
	 611  		// sconn.Close above, which would also cause the
	 612  		// client to unblock like CloseWrite.
	 613  		<-clientDoneChan
	 614  		return nil
	 615  	}
	 616  
	 617  	clientCloseWrite := func() error {
	 618  		defer close(clientDoneChan)
	 619  
	 620  		clientConfig := testConfig.Clone()
	 621  		conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
	 622  		if err != nil {
	 623  			return err
	 624  		}
	 625  		if err := conn.Handshake(); err != nil {
	 626  			return err
	 627  		}
	 628  		defer conn.Close()
	 629  
	 630  		if err := conn.CloseWrite(); err != nil {
	 631  			return fmt.Errorf("client CloseWrite: %v", err)
	 632  		}
	 633  
	 634  		if _, err := conn.Write([]byte{0}); err != errShutdown {
	 635  			return fmt.Errorf("CloseWrite error = %v; want errShutdown", err)
	 636  		}
	 637  
	 638  		data, err := io.ReadAll(conn)
	 639  		if err != nil {
	 640  			return err
	 641  		}
	 642  		if len(data) > 0 {
	 643  			return fmt.Errorf("Read data = %q; want nothing", data)
	 644  		}
	 645  		return nil
	 646  	}
	 647  
	 648  	errChan := make(chan error, 2)
	 649  
	 650  	go func() { errChan <- serverCloseWrite() }()
	 651  	go func() { errChan <- clientCloseWrite() }()
	 652  
	 653  	for i := 0; i < 2; i++ {
	 654  		select {
	 655  		case err := <-errChan:
	 656  			if err != nil {
	 657  				t.Fatal(err)
	 658  			}
	 659  		case <-time.After(10 * time.Second):
	 660  			t.Fatal("deadlock")
	 661  		}
	 662  	}
	 663  
	 664  	// Also test CloseWrite being called before the handshake is
	 665  	// finished:
	 666  	{
	 667  		ln2 := newLocalListener(t)
	 668  		defer ln2.Close()
	 669  
	 670  		netConn, err := net.Dial("tcp", ln2.Addr().String())
	 671  		if err != nil {
	 672  			t.Fatal(err)
	 673  		}
	 674  		defer netConn.Close()
	 675  		conn := Client(netConn, testConfig.Clone())
	 676  
	 677  		if err := conn.CloseWrite(); err != errEarlyCloseWrite {
	 678  			t.Errorf("CloseWrite error = %v; want errEarlyCloseWrite", err)
	 679  		}
	 680  	}
	 681  }
	 682  
	 683  func TestWarningAlertFlood(t *testing.T) {
	 684  	ln := newLocalListener(t)
	 685  	defer ln.Close()
	 686  
	 687  	server := func() error {
	 688  		sconn, err := ln.Accept()
	 689  		if err != nil {
	 690  			return fmt.Errorf("accept: %v", err)
	 691  		}
	 692  		defer sconn.Close()
	 693  
	 694  		serverConfig := testConfig.Clone()
	 695  		srv := Server(sconn, serverConfig)
	 696  		if err := srv.Handshake(); err != nil {
	 697  			return fmt.Errorf("handshake: %v", err)
	 698  		}
	 699  		defer srv.Close()
	 700  
	 701  		_, err = io.ReadAll(srv)
	 702  		if err == nil {
	 703  			return errors.New("unexpected lack of error from server")
	 704  		}
	 705  		const expected = "too many ignored"
	 706  		if str := err.Error(); !strings.Contains(str, expected) {
	 707  			return fmt.Errorf("expected error containing %q, but saw: %s", expected, str)
	 708  		}
	 709  
	 710  		return nil
	 711  	}
	 712  
	 713  	errChan := make(chan error, 1)
	 714  	go func() { errChan <- server() }()
	 715  
	 716  	clientConfig := testConfig.Clone()
	 717  	clientConfig.MaxVersion = VersionTLS12 // there are no warning alerts in TLS 1.3
	 718  	conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
	 719  	if err != nil {
	 720  		t.Fatal(err)
	 721  	}
	 722  	defer conn.Close()
	 723  	if err := conn.Handshake(); err != nil {
	 724  		t.Fatal(err)
	 725  	}
	 726  
	 727  	for i := 0; i < maxUselessRecords+1; i++ {
	 728  		conn.sendAlert(alertNoRenegotiation)
	 729  	}
	 730  
	 731  	if err := <-errChan; err != nil {
	 732  		t.Fatal(err)
	 733  	}
	 734  }
	 735  
	 736  func TestCloneFuncFields(t *testing.T) {
	 737  	const expectedCount = 6
	 738  	called := 0
	 739  
	 740  	c1 := Config{
	 741  		Time: func() time.Time {
	 742  			called |= 1 << 0
	 743  			return time.Time{}
	 744  		},
	 745  		GetCertificate: func(*ClientHelloInfo) (*Certificate, error) {
	 746  			called |= 1 << 1
	 747  			return nil, nil
	 748  		},
	 749  		GetClientCertificate: func(*CertificateRequestInfo) (*Certificate, error) {
	 750  			called |= 1 << 2
	 751  			return nil, nil
	 752  		},
	 753  		GetConfigForClient: func(*ClientHelloInfo) (*Config, error) {
	 754  			called |= 1 << 3
	 755  			return nil, nil
	 756  		},
	 757  		VerifyPeerCertificate: func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
	 758  			called |= 1 << 4
	 759  			return nil
	 760  		},
	 761  		VerifyConnection: func(ConnectionState) error {
	 762  			called |= 1 << 5
	 763  			return nil
	 764  		},
	 765  	}
	 766  
	 767  	c2 := c1.Clone()
	 768  
	 769  	c2.Time()
	 770  	c2.GetCertificate(nil)
	 771  	c2.GetClientCertificate(nil)
	 772  	c2.GetConfigForClient(nil)
	 773  	c2.VerifyPeerCertificate(nil, nil)
	 774  	c2.VerifyConnection(ConnectionState{})
	 775  
	 776  	if called != (1<<expectedCount)-1 {
	 777  		t.Fatalf("expected %d calls but saw calls %b", expectedCount, called)
	 778  	}
	 779  }
	 780  
	 781  func TestCloneNonFuncFields(t *testing.T) {
	 782  	var c1 Config
	 783  	v := reflect.ValueOf(&c1).Elem()
	 784  
	 785  	typ := v.Type()
	 786  	for i := 0; i < typ.NumField(); i++ {
	 787  		f := v.Field(i)
	 788  		// testing/quick can't handle functions or interfaces and so
	 789  		// isn't used here.
	 790  		switch fn := typ.Field(i).Name; fn {
	 791  		case "Rand":
	 792  			f.Set(reflect.ValueOf(io.Reader(os.Stdin)))
	 793  		case "Time", "GetCertificate", "GetConfigForClient", "VerifyPeerCertificate", "VerifyConnection", "GetClientCertificate":
	 794  			// DeepEqual can't compare functions. If you add a
	 795  			// function field to this list, you must also change
	 796  			// TestCloneFuncFields to ensure that the func field is
	 797  			// cloned.
	 798  		case "Certificates":
	 799  			f.Set(reflect.ValueOf([]Certificate{
	 800  				{Certificate: [][]byte{{'b'}}},
	 801  			}))
	 802  		case "NameToCertificate":
	 803  			f.Set(reflect.ValueOf(map[string]*Certificate{"a": nil}))
	 804  		case "RootCAs", "ClientCAs":
	 805  			f.Set(reflect.ValueOf(x509.NewCertPool()))
	 806  		case "ClientSessionCache":
	 807  			f.Set(reflect.ValueOf(NewLRUClientSessionCache(10)))
	 808  		case "KeyLogWriter":
	 809  			f.Set(reflect.ValueOf(io.Writer(os.Stdout)))
	 810  		case "NextProtos":
	 811  			f.Set(reflect.ValueOf([]string{"a", "b"}))
	 812  		case "ServerName":
	 813  			f.Set(reflect.ValueOf("b"))
	 814  		case "ClientAuth":
	 815  			f.Set(reflect.ValueOf(VerifyClientCertIfGiven))
	 816  		case "InsecureSkipVerify", "SessionTicketsDisabled", "DynamicRecordSizingDisabled", "PreferServerCipherSuites":
	 817  			f.Set(reflect.ValueOf(true))
	 818  		case "MinVersion", "MaxVersion":
	 819  			f.Set(reflect.ValueOf(uint16(VersionTLS12)))
	 820  		case "SessionTicketKey":
	 821  			f.Set(reflect.ValueOf([32]byte{}))
	 822  		case "CipherSuites":
	 823  			f.Set(reflect.ValueOf([]uint16{1, 2}))
	 824  		case "CurvePreferences":
	 825  			f.Set(reflect.ValueOf([]CurveID{CurveP256}))
	 826  		case "Renegotiation":
	 827  			f.Set(reflect.ValueOf(RenegotiateOnceAsClient))
	 828  		case "mutex", "autoSessionTicketKeys", "sessionTicketKeys":
	 829  			continue // these are unexported fields that are handled separately
	 830  		default:
	 831  			t.Errorf("all fields must be accounted for, but saw unknown field %q", fn)
	 832  		}
	 833  	}
	 834  	// Set the unexported fields related to session ticket keys, which are copied with Clone().
	 835  	c1.autoSessionTicketKeys = []ticketKey{c1.ticketKeyFromBytes(c1.SessionTicketKey)}
	 836  	c1.sessionTicketKeys = []ticketKey{c1.ticketKeyFromBytes(c1.SessionTicketKey)}
	 837  
	 838  	c2 := c1.Clone()
	 839  	if !reflect.DeepEqual(&c1, c2) {
	 840  		t.Errorf("clone failed to copy a field")
	 841  	}
	 842  }
	 843  
	 844  func TestCloneNilConfig(t *testing.T) {
	 845  	var config *Config
	 846  	if cc := config.Clone(); cc != nil {
	 847  		t.Fatalf("Clone with nil should return nil, got: %+v", cc)
	 848  	}
	 849  }
	 850  
	 851  // changeImplConn is a net.Conn which can change its Write and Close
	 852  // methods.
	 853  type changeImplConn struct {
	 854  	net.Conn
	 855  	writeFunc func([]byte) (int, error)
	 856  	closeFunc func() error
	 857  }
	 858  
	 859  func (w *changeImplConn) Write(p []byte) (n int, err error) {
	 860  	if w.writeFunc != nil {
	 861  		return w.writeFunc(p)
	 862  	}
	 863  	return w.Conn.Write(p)
	 864  }
	 865  
	 866  func (w *changeImplConn) Close() error {
	 867  	if w.closeFunc != nil {
	 868  		return w.closeFunc()
	 869  	}
	 870  	return w.Conn.Close()
	 871  }
	 872  
	 873  func throughput(b *testing.B, version uint16, totalBytes int64, dynamicRecordSizingDisabled bool) {
	 874  	ln := newLocalListener(b)
	 875  	defer ln.Close()
	 876  
	 877  	N := b.N
	 878  
	 879  	// Less than 64KB because Windows appears to use a TCP rwin < 64KB.
	 880  	// See Issue #15899.
	 881  	const bufsize = 32 << 10
	 882  
	 883  	go func() {
	 884  		buf := make([]byte, bufsize)
	 885  		for i := 0; i < N; i++ {
	 886  			sconn, err := ln.Accept()
	 887  			if err != nil {
	 888  				// panic rather than synchronize to avoid benchmark overhead
	 889  				// (cannot call b.Fatal in goroutine)
	 890  				panic(fmt.Errorf("accept: %v", err))
	 891  			}
	 892  			serverConfig := testConfig.Clone()
	 893  			serverConfig.CipherSuites = nil // the defaults may prefer faster ciphers
	 894  			serverConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
	 895  			srv := Server(sconn, serverConfig)
	 896  			if err := srv.Handshake(); err != nil {
	 897  				panic(fmt.Errorf("handshake: %v", err))
	 898  			}
	 899  			if _, err := io.CopyBuffer(srv, srv, buf); err != nil {
	 900  				panic(fmt.Errorf("copy buffer: %v", err))
	 901  			}
	 902  		}
	 903  	}()
	 904  
	 905  	b.SetBytes(totalBytes)
	 906  	clientConfig := testConfig.Clone()
	 907  	clientConfig.CipherSuites = nil // the defaults may prefer faster ciphers
	 908  	clientConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
	 909  	clientConfig.MaxVersion = version
	 910  
	 911  	buf := make([]byte, bufsize)
	 912  	chunks := int(math.Ceil(float64(totalBytes) / float64(len(buf))))
	 913  	for i := 0; i < N; i++ {
	 914  		conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
	 915  		if err != nil {
	 916  			b.Fatal(err)
	 917  		}
	 918  		for j := 0; j < chunks; j++ {
	 919  			_, err := conn.Write(buf)
	 920  			if err != nil {
	 921  				b.Fatal(err)
	 922  			}
	 923  			_, err = io.ReadFull(conn, buf)
	 924  			if err != nil {
	 925  				b.Fatal(err)
	 926  			}
	 927  		}
	 928  		conn.Close()
	 929  	}
	 930  }
	 931  
	 932  func BenchmarkThroughput(b *testing.B) {
	 933  	for _, mode := range []string{"Max", "Dynamic"} {
	 934  		for size := 1; size <= 64; size <<= 1 {
	 935  			name := fmt.Sprintf("%sPacket/%dMB", mode, size)
	 936  			b.Run(name, func(b *testing.B) {
	 937  				b.Run("TLSv12", func(b *testing.B) {
	 938  					throughput(b, VersionTLS12, int64(size<<20), mode == "Max")
	 939  				})
	 940  				b.Run("TLSv13", func(b *testing.B) {
	 941  					throughput(b, VersionTLS13, int64(size<<20), mode == "Max")
	 942  				})
	 943  			})
	 944  		}
	 945  	}
	 946  }
	 947  
	 948  type slowConn struct {
	 949  	net.Conn
	 950  	bps int
	 951  }
	 952  
	 953  func (c *slowConn) Write(p []byte) (int, error) {
	 954  	if c.bps == 0 {
	 955  		panic("too slow")
	 956  	}
	 957  	t0 := time.Now()
	 958  	wrote := 0
	 959  	for wrote < len(p) {
	 960  		time.Sleep(100 * time.Microsecond)
	 961  		allowed := int(time.Since(t0).Seconds()*float64(c.bps)) / 8
	 962  		if allowed > len(p) {
	 963  			allowed = len(p)
	 964  		}
	 965  		if wrote < allowed {
	 966  			n, err := c.Conn.Write(p[wrote:allowed])
	 967  			wrote += n
	 968  			if err != nil {
	 969  				return wrote, err
	 970  			}
	 971  		}
	 972  	}
	 973  	return len(p), nil
	 974  }
	 975  
	 976  func latency(b *testing.B, version uint16, bps int, dynamicRecordSizingDisabled bool) {
	 977  	ln := newLocalListener(b)
	 978  	defer ln.Close()
	 979  
	 980  	N := b.N
	 981  
	 982  	go func() {
	 983  		for i := 0; i < N; i++ {
	 984  			sconn, err := ln.Accept()
	 985  			if err != nil {
	 986  				// panic rather than synchronize to avoid benchmark overhead
	 987  				// (cannot call b.Fatal in goroutine)
	 988  				panic(fmt.Errorf("accept: %v", err))
	 989  			}
	 990  			serverConfig := testConfig.Clone()
	 991  			serverConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
	 992  			srv := Server(&slowConn{sconn, bps}, serverConfig)
	 993  			if err := srv.Handshake(); err != nil {
	 994  				panic(fmt.Errorf("handshake: %v", err))
	 995  			}
	 996  			io.Copy(srv, srv)
	 997  		}
	 998  	}()
	 999  
	1000  	clientConfig := testConfig.Clone()
	1001  	clientConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
	1002  	clientConfig.MaxVersion = version
	1003  
	1004  	buf := make([]byte, 16384)
	1005  	peek := make([]byte, 1)
	1006  
	1007  	for i := 0; i < N; i++ {
	1008  		conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
	1009  		if err != nil {
	1010  			b.Fatal(err)
	1011  		}
	1012  		// make sure we're connected and previous connection has stopped
	1013  		if _, err := conn.Write(buf[:1]); err != nil {
	1014  			b.Fatal(err)
	1015  		}
	1016  		if _, err := io.ReadFull(conn, peek); err != nil {
	1017  			b.Fatal(err)
	1018  		}
	1019  		if _, err := conn.Write(buf); err != nil {
	1020  			b.Fatal(err)
	1021  		}
	1022  		if _, err = io.ReadFull(conn, peek); err != nil {
	1023  			b.Fatal(err)
	1024  		}
	1025  		conn.Close()
	1026  	}
	1027  }
	1028  
	1029  func BenchmarkLatency(b *testing.B) {
	1030  	for _, mode := range []string{"Max", "Dynamic"} {
	1031  		for _, kbps := range []int{200, 500, 1000, 2000, 5000} {
	1032  			name := fmt.Sprintf("%sPacket/%dkbps", mode, kbps)
	1033  			b.Run(name, func(b *testing.B) {
	1034  				b.Run("TLSv12", func(b *testing.B) {
	1035  					latency(b, VersionTLS12, kbps*1000, mode == "Max")
	1036  				})
	1037  				b.Run("TLSv13", func(b *testing.B) {
	1038  					latency(b, VersionTLS13, kbps*1000, mode == "Max")
	1039  				})
	1040  			})
	1041  		}
	1042  	}
	1043  }
	1044  
	1045  func TestConnectionStateMarshal(t *testing.T) {
	1046  	cs := &ConnectionState{}
	1047  	_, err := json.Marshal(cs)
	1048  	if err != nil {
	1049  		t.Errorf("json.Marshal failed on ConnectionState: %v", err)
	1050  	}
	1051  }
	1052  
	1053  func TestConnectionState(t *testing.T) {
	1054  	issuer, err := x509.ParseCertificate(testRSACertificateIssuer)
	1055  	if err != nil {
	1056  		panic(err)
	1057  	}
	1058  	rootCAs := x509.NewCertPool()
	1059  	rootCAs.AddCert(issuer)
	1060  
	1061  	now := func() time.Time { return time.Unix(1476984729, 0) }
	1062  
	1063  	const alpnProtocol = "golang"
	1064  	const serverName = "example.golang"
	1065  	var scts = [][]byte{[]byte("dummy sct 1"), []byte("dummy sct 2")}
	1066  	var ocsp = []byte("dummy ocsp")
	1067  
	1068  	for _, v := range []uint16{VersionTLS12, VersionTLS13} {
	1069  		var name string
	1070  		switch v {
	1071  		case VersionTLS12:
	1072  			name = "TLSv12"
	1073  		case VersionTLS13:
	1074  			name = "TLSv13"
	1075  		}
	1076  		t.Run(name, func(t *testing.T) {
	1077  			config := &Config{
	1078  				Time:				 now,
	1079  				Rand:				 zeroSource{},
	1080  				Certificates: make([]Certificate, 1),
	1081  				MaxVersion:	 v,
	1082  				RootCAs:			rootCAs,
	1083  				ClientCAs:		rootCAs,
	1084  				ClientAuth:	 RequireAndVerifyClientCert,
	1085  				NextProtos:	 []string{alpnProtocol},
	1086  				ServerName:	 serverName,
	1087  			}
	1088  			config.Certificates[0].Certificate = [][]byte{testRSACertificate}
	1089  			config.Certificates[0].PrivateKey = testRSAPrivateKey
	1090  			config.Certificates[0].SignedCertificateTimestamps = scts
	1091  			config.Certificates[0].OCSPStaple = ocsp
	1092  
	1093  			ss, cs, err := testHandshake(t, config, config)
	1094  			if err != nil {
	1095  				t.Fatalf("Handshake failed: %v", err)
	1096  			}
	1097  
	1098  			if ss.Version != v || cs.Version != v {
	1099  				t.Errorf("Got versions %x (server) and %x (client), expected %x", ss.Version, cs.Version, v)
	1100  			}
	1101  
	1102  			if !ss.HandshakeComplete || !cs.HandshakeComplete {
	1103  				t.Errorf("Got HandshakeComplete %v (server) and %v (client), expected true", ss.HandshakeComplete, cs.HandshakeComplete)
	1104  			}
	1105  
	1106  			if ss.DidResume || cs.DidResume {
	1107  				t.Errorf("Got DidResume %v (server) and %v (client), expected false", ss.DidResume, cs.DidResume)
	1108  			}
	1109  
	1110  			if ss.CipherSuite == 0 || cs.CipherSuite == 0 {
	1111  				t.Errorf("Got invalid cipher suite: %v (server) and %v (client)", ss.CipherSuite, cs.CipherSuite)
	1112  			}
	1113  
	1114  			if ss.NegotiatedProtocol != alpnProtocol || cs.NegotiatedProtocol != alpnProtocol {
	1115  				t.Errorf("Got negotiated protocol %q (server) and %q (client), expected %q", ss.NegotiatedProtocol, cs.NegotiatedProtocol, alpnProtocol)
	1116  			}
	1117  
	1118  			if !cs.NegotiatedProtocolIsMutual {
	1119  				t.Errorf("Got false NegotiatedProtocolIsMutual on the client side")
	1120  			}
	1121  			// NegotiatedProtocolIsMutual on the server side is unspecified.
	1122  
	1123  			if ss.ServerName != serverName {
	1124  				t.Errorf("Got server name %q, expected %q", ss.ServerName, serverName)
	1125  			}
	1126  			if cs.ServerName != serverName {
	1127  				t.Errorf("Got server name on client connection %q, expected %q", cs.ServerName, serverName)
	1128  			}
	1129  
	1130  			if len(ss.PeerCertificates) != 1 || len(cs.PeerCertificates) != 1 {
	1131  				t.Errorf("Got %d (server) and %d (client) peer certificates, expected %d", len(ss.PeerCertificates), len(cs.PeerCertificates), 1)
	1132  			}
	1133  
	1134  			if len(ss.VerifiedChains) != 1 || len(cs.VerifiedChains) != 1 {
	1135  				t.Errorf("Got %d (server) and %d (client) verified chains, expected %d", len(ss.VerifiedChains), len(cs.VerifiedChains), 1)
	1136  			} else if len(ss.VerifiedChains[0]) != 2 || len(cs.VerifiedChains[0]) != 2 {
	1137  				t.Errorf("Got %d (server) and %d (client) long verified chain, expected %d", len(ss.VerifiedChains[0]), len(cs.VerifiedChains[0]), 2)
	1138  			}
	1139  
	1140  			if len(cs.SignedCertificateTimestamps) != 2 {
	1141  				t.Errorf("Got %d SCTs, expected %d", len(cs.SignedCertificateTimestamps), 2)
	1142  			}
	1143  			if !bytes.Equal(cs.OCSPResponse, ocsp) {
	1144  				t.Errorf("Got OCSPs %x, expected %x", cs.OCSPResponse, ocsp)
	1145  			}
	1146  			// Only TLS 1.3 supports OCSP and SCTs on client certs.
	1147  			if v == VersionTLS13 {
	1148  				if len(ss.SignedCertificateTimestamps) != 2 {
	1149  					t.Errorf("Got %d client SCTs, expected %d", len(ss.SignedCertificateTimestamps), 2)
	1150  				}
	1151  				if !bytes.Equal(ss.OCSPResponse, ocsp) {
	1152  					t.Errorf("Got client OCSPs %x, expected %x", ss.OCSPResponse, ocsp)
	1153  				}
	1154  			}
	1155  
	1156  			if v == VersionTLS13 {
	1157  				if ss.TLSUnique != nil || cs.TLSUnique != nil {
	1158  					t.Errorf("Got TLSUnique %x (server) and %x (client), expected nil in TLS 1.3", ss.TLSUnique, cs.TLSUnique)
	1159  				}
	1160  			} else {
	1161  				if ss.TLSUnique == nil || cs.TLSUnique == nil {
	1162  					t.Errorf("Got TLSUnique %x (server) and %x (client), expected non-nil", ss.TLSUnique, cs.TLSUnique)
	1163  				}
	1164  			}
	1165  		})
	1166  	}
	1167  }
	1168  
	1169  // Issue 28744: Ensure that we don't modify memory
	1170  // that Config doesn't own such as Certificates.
	1171  func TestBuildNameToCertificate_doesntModifyCertificates(t *testing.T) {
	1172  	c0 := Certificate{
	1173  		Certificate: [][]byte{testRSACertificate},
	1174  		PrivateKey:	testRSAPrivateKey,
	1175  	}
	1176  	c1 := Certificate{
	1177  		Certificate: [][]byte{testSNICertificate},
	1178  		PrivateKey:	testRSAPrivateKey,
	1179  	}
	1180  	config := testConfig.Clone()
	1181  	config.Certificates = []Certificate{c0, c1}
	1182  
	1183  	config.BuildNameToCertificate()
	1184  	got := config.Certificates
	1185  	want := []Certificate{c0, c1}
	1186  	if !reflect.DeepEqual(got, want) {
	1187  		t.Fatalf("Certificates were mutated by BuildNameToCertificate\nGot: %#v\nWant: %#v\n", got, want)
	1188  	}
	1189  }
	1190  
	1191  func testingKey(s string) string { return strings.ReplaceAll(s, "TESTING KEY", "PRIVATE KEY") }
	1192  
	1193  func TestClientHelloInfo_SupportsCertificate(t *testing.T) {
	1194  	rsaCert := &Certificate{
	1195  		Certificate: [][]byte{testRSACertificate},
	1196  		PrivateKey:	testRSAPrivateKey,
	1197  	}
	1198  	pkcs1Cert := &Certificate{
	1199  		Certificate:									[][]byte{testRSACertificate},
	1200  		PrivateKey:									 testRSAPrivateKey,
	1201  		SupportedSignatureAlgorithms: []SignatureScheme{PKCS1WithSHA1, PKCS1WithSHA256},
	1202  	}
	1203  	ecdsaCert := &Certificate{
	1204  		// ECDSA P-256 certificate
	1205  		Certificate: [][]byte{testP256Certificate},
	1206  		PrivateKey:	testP256PrivateKey,
	1207  	}
	1208  	ed25519Cert := &Certificate{
	1209  		Certificate: [][]byte{testEd25519Certificate},
	1210  		PrivateKey:	testEd25519PrivateKey,
	1211  	}
	1212  
	1213  	tests := []struct {
	1214  		c			 *Certificate
	1215  		chi		 *ClientHelloInfo
	1216  		wantErr string
	1217  	}{
	1218  		{rsaCert, &ClientHelloInfo{
	1219  			ServerName:				"example.golang",
	1220  			SignatureSchemes:	[]SignatureScheme{PSSWithSHA256},
	1221  			SupportedVersions: []uint16{VersionTLS13},
	1222  		}, ""},
	1223  		{ecdsaCert, &ClientHelloInfo{
	1224  			SignatureSchemes:	[]SignatureScheme{PSSWithSHA256, ECDSAWithP256AndSHA256},
	1225  			SupportedVersions: []uint16{VersionTLS13, VersionTLS12},
	1226  		}, ""},
	1227  		{rsaCert, &ClientHelloInfo{
	1228  			ServerName:				"example.com",
	1229  			SignatureSchemes:	[]SignatureScheme{PSSWithSHA256},
	1230  			SupportedVersions: []uint16{VersionTLS13},
	1231  		}, "not valid for requested server name"},
	1232  		{ecdsaCert, &ClientHelloInfo{
	1233  			SignatureSchemes:	[]SignatureScheme{ECDSAWithP384AndSHA384},
	1234  			SupportedVersions: []uint16{VersionTLS13},
	1235  		}, "signature algorithms"},
	1236  		{pkcs1Cert, &ClientHelloInfo{
	1237  			SignatureSchemes:	[]SignatureScheme{PSSWithSHA256, ECDSAWithP256AndSHA256},
	1238  			SupportedVersions: []uint16{VersionTLS13},
	1239  		}, "signature algorithms"},
	1240  
	1241  		{rsaCert, &ClientHelloInfo{
	1242  			CipherSuites:			[]uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
	1243  			SignatureSchemes:	[]SignatureScheme{PKCS1WithSHA1},
	1244  			SupportedVersions: []uint16{VersionTLS13, VersionTLS12},
	1245  		}, "signature algorithms"},
	1246  		{rsaCert, &ClientHelloInfo{
	1247  			CipherSuites:			[]uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
	1248  			SignatureSchemes:	[]SignatureScheme{PKCS1WithSHA1},
	1249  			SupportedVersions: []uint16{VersionTLS13, VersionTLS12},
	1250  			config: &Config{
	1251  				MaxVersion: VersionTLS12,
	1252  			},
	1253  		}, ""}, // Check that mutual version selection works.
	1254  
	1255  		{ecdsaCert, &ClientHelloInfo{
	1256  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1257  			SupportedCurves:	 []CurveID{CurveP256},
	1258  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1259  			SignatureSchemes:	[]SignatureScheme{ECDSAWithP256AndSHA256},
	1260  			SupportedVersions: []uint16{VersionTLS12},
	1261  		}, ""},
	1262  		{ecdsaCert, &ClientHelloInfo{
	1263  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1264  			SupportedCurves:	 []CurveID{CurveP256},
	1265  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1266  			SignatureSchemes:	[]SignatureScheme{ECDSAWithP384AndSHA384},
	1267  			SupportedVersions: []uint16{VersionTLS12},
	1268  		}, ""}, // TLS 1.2 does not restrict curves based on the SignatureScheme.
	1269  		{ecdsaCert, &ClientHelloInfo{
	1270  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1271  			SupportedCurves:	 []CurveID{CurveP256},
	1272  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1273  			SignatureSchemes:	nil,
	1274  			SupportedVersions: []uint16{VersionTLS12},
	1275  		}, ""}, // TLS 1.2 comes with default signature schemes.
	1276  		{ecdsaCert, &ClientHelloInfo{
	1277  			CipherSuites:			[]uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
	1278  			SupportedCurves:	 []CurveID{CurveP256},
	1279  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1280  			SignatureSchemes:	[]SignatureScheme{ECDSAWithP256AndSHA256},
	1281  			SupportedVersions: []uint16{VersionTLS12},
	1282  		}, "cipher suite"},
	1283  		{ecdsaCert, &ClientHelloInfo{
	1284  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1285  			SupportedCurves:	 []CurveID{CurveP256},
	1286  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1287  			SignatureSchemes:	[]SignatureScheme{ECDSAWithP256AndSHA256},
	1288  			SupportedVersions: []uint16{VersionTLS12},
	1289  			config: &Config{
	1290  				CipherSuites: []uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
	1291  			},
	1292  		}, "cipher suite"},
	1293  		{ecdsaCert, &ClientHelloInfo{
	1294  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1295  			SupportedCurves:	 []CurveID{CurveP384},
	1296  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1297  			SignatureSchemes:	[]SignatureScheme{ECDSAWithP256AndSHA256},
	1298  			SupportedVersions: []uint16{VersionTLS12},
	1299  		}, "certificate curve"},
	1300  		{ecdsaCert, &ClientHelloInfo{
	1301  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1302  			SupportedCurves:	 []CurveID{CurveP256},
	1303  			SupportedPoints:	 []uint8{1},
	1304  			SignatureSchemes:	[]SignatureScheme{ECDSAWithP256AndSHA256},
	1305  			SupportedVersions: []uint16{VersionTLS12},
	1306  		}, "doesn't support ECDHE"},
	1307  		{ecdsaCert, &ClientHelloInfo{
	1308  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1309  			SupportedCurves:	 []CurveID{CurveP256},
	1310  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1311  			SignatureSchemes:	[]SignatureScheme{PSSWithSHA256},
	1312  			SupportedVersions: []uint16{VersionTLS12},
	1313  		}, "signature algorithms"},
	1314  
	1315  		{ed25519Cert, &ClientHelloInfo{
	1316  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1317  			SupportedCurves:	 []CurveID{CurveP256}, // only relevant for ECDHE support
	1318  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1319  			SignatureSchemes:	[]SignatureScheme{Ed25519},
	1320  			SupportedVersions: []uint16{VersionTLS12},
	1321  		}, ""},
	1322  		{ed25519Cert, &ClientHelloInfo{
	1323  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1324  			SupportedCurves:	 []CurveID{CurveP256}, // only relevant for ECDHE support
	1325  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1326  			SignatureSchemes:	[]SignatureScheme{Ed25519},
	1327  			SupportedVersions: []uint16{VersionTLS10},
	1328  		}, "doesn't support Ed25519"},
	1329  		{ed25519Cert, &ClientHelloInfo{
	1330  			CipherSuites:			[]uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
	1331  			SupportedCurves:	 []CurveID{},
	1332  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1333  			SignatureSchemes:	[]SignatureScheme{Ed25519},
	1334  			SupportedVersions: []uint16{VersionTLS12},
	1335  		}, "doesn't support ECDHE"},
	1336  
	1337  		{rsaCert, &ClientHelloInfo{
	1338  			CipherSuites:			[]uint16{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA},
	1339  			SupportedCurves:	 []CurveID{CurveP256}, // only relevant for ECDHE support
	1340  			SupportedPoints:	 []uint8{pointFormatUncompressed},
	1341  			SupportedVersions: []uint16{VersionTLS10},
	1342  		}, ""},
	1343  		{rsaCert, &ClientHelloInfo{
	1344  			CipherSuites:			[]uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
	1345  			SupportedVersions: []uint16{VersionTLS12},
	1346  		}, ""}, // static RSA fallback
	1347  	}
	1348  	for i, tt := range tests {
	1349  		err := tt.chi.SupportsCertificate(tt.c)
	1350  		switch {
	1351  		case tt.wantErr == "" && err != nil:
	1352  			t.Errorf("%d: unexpected error: %v", i, err)
	1353  		case tt.wantErr != "" && err == nil:
	1354  			t.Errorf("%d: unexpected success", i)
	1355  		case tt.wantErr != "" && !strings.Contains(err.Error(), tt.wantErr):
	1356  			t.Errorf("%d: got error %q, expected %q", i, err, tt.wantErr)
	1357  		}
	1358  	}
	1359  }
	1360  
	1361  func TestCipherSuites(t *testing.T) {
	1362  	var lastID uint16
	1363  	for _, c := range CipherSuites() {
	1364  		if lastID > c.ID {
	1365  			t.Errorf("CipherSuites are not ordered by ID: got %#04x after %#04x", c.ID, lastID)
	1366  		} else {
	1367  			lastID = c.ID
	1368  		}
	1369  
	1370  		if c.Insecure {
	1371  			t.Errorf("%#04x: Insecure CipherSuite returned by CipherSuites()", c.ID)
	1372  		}
	1373  	}
	1374  	lastID = 0
	1375  	for _, c := range InsecureCipherSuites() {
	1376  		if lastID > c.ID {
	1377  			t.Errorf("InsecureCipherSuites are not ordered by ID: got %#04x after %#04x", c.ID, lastID)
	1378  		} else {
	1379  			lastID = c.ID
	1380  		}
	1381  
	1382  		if !c.Insecure {
	1383  			t.Errorf("%#04x: not Insecure CipherSuite returned by InsecureCipherSuites()", c.ID)
	1384  		}
	1385  	}
	1386  
	1387  	CipherSuiteByID := func(id uint16) *CipherSuite {
	1388  		for _, c := range CipherSuites() {
	1389  			if c.ID == id {
	1390  				return c
	1391  			}
	1392  		}
	1393  		for _, c := range InsecureCipherSuites() {
	1394  			if c.ID == id {
	1395  				return c
	1396  			}
	1397  		}
	1398  		return nil
	1399  	}
	1400  
	1401  	for _, c := range cipherSuites {
	1402  		cc := CipherSuiteByID(c.id)
	1403  		if cc == nil {
	1404  			t.Errorf("%#04x: no CipherSuite entry", c.id)
	1405  			continue
	1406  		}
	1407  
	1408  		if tls12Only := c.flags&suiteTLS12 != 0; tls12Only && len(cc.SupportedVersions) != 1 {
	1409  			t.Errorf("%#04x: suite is TLS 1.2 only, but SupportedVersions is %v", c.id, cc.SupportedVersions)
	1410  		} else if !tls12Only && len(cc.SupportedVersions) != 3 {
	1411  			t.Errorf("%#04x: suite TLS 1.0-1.2, but SupportedVersions is %v", c.id, cc.SupportedVersions)
	1412  		}
	1413  
	1414  		if got := CipherSuiteName(c.id); got != cc.Name {
	1415  			t.Errorf("%#04x: unexpected CipherSuiteName: got %q, expected %q", c.id, got, cc.Name)
	1416  		}
	1417  	}
	1418  	for _, c := range cipherSuitesTLS13 {
	1419  		cc := CipherSuiteByID(c.id)
	1420  		if cc == nil {
	1421  			t.Errorf("%#04x: no CipherSuite entry", c.id)
	1422  			continue
	1423  		}
	1424  
	1425  		if cc.Insecure {
	1426  			t.Errorf("%#04x: Insecure %v, expected false", c.id, cc.Insecure)
	1427  		}
	1428  		if len(cc.SupportedVersions) != 1 || cc.SupportedVersions[0] != VersionTLS13 {
	1429  			t.Errorf("%#04x: suite is TLS 1.3 only, but SupportedVersions is %v", c.id, cc.SupportedVersions)
	1430  		}
	1431  
	1432  		if got := CipherSuiteName(c.id); got != cc.Name {
	1433  			t.Errorf("%#04x: unexpected CipherSuiteName: got %q, expected %q", c.id, got, cc.Name)
	1434  		}
	1435  	}
	1436  
	1437  	if got := CipherSuiteName(0xabc); got != "0x0ABC" {
	1438  		t.Errorf("unexpected fallback CipherSuiteName: got %q, expected 0x0ABC", got)
	1439  	}
	1440  
	1441  	if len(cipherSuitesPreferenceOrder) != len(cipherSuites) {
	1442  		t.Errorf("cipherSuitesPreferenceOrder is not the same size as cipherSuites")
	1443  	}
	1444  	if len(cipherSuitesPreferenceOrderNoAES) != len(cipherSuitesPreferenceOrder) {
	1445  		t.Errorf("cipherSuitesPreferenceOrderNoAES is not the same size as cipherSuitesPreferenceOrder")
	1446  	}
	1447  
	1448  	// Check that disabled suites are at the end of the preference lists, and
	1449  	// that they are marked insecure.
	1450  	for i, id := range disabledCipherSuites {
	1451  		offset := len(cipherSuitesPreferenceOrder) - len(disabledCipherSuites)
	1452  		if cipherSuitesPreferenceOrder[offset+i] != id {
	1453  			t.Errorf("disabledCipherSuites[%d]: not at the end of cipherSuitesPreferenceOrder", i)
	1454  		}
	1455  		if cipherSuitesPreferenceOrderNoAES[offset+i] != id {
	1456  			t.Errorf("disabledCipherSuites[%d]: not at the end of cipherSuitesPreferenceOrderNoAES", i)
	1457  		}
	1458  		c := CipherSuiteByID(id)
	1459  		if c == nil {
	1460  			t.Errorf("%#04x: no CipherSuite entry", id)
	1461  			continue
	1462  		}
	1463  		if !c.Insecure {
	1464  			t.Errorf("%#04x: disabled by default but not marked insecure", id)
	1465  		}
	1466  	}
	1467  
	1468  	for i, prefOrder := range [][]uint16{cipherSuitesPreferenceOrder, cipherSuitesPreferenceOrderNoAES} {
	1469  		// Check that insecure and HTTP/2 bad cipher suites are at the end of
	1470  		// the preference lists.
	1471  		var sawInsecure, sawBad bool
	1472  		for _, id := range prefOrder {
	1473  			c := CipherSuiteByID(id)
	1474  			if c == nil {
	1475  				t.Errorf("%#04x: no CipherSuite entry", id)
	1476  				continue
	1477  			}
	1478  
	1479  			if c.Insecure {
	1480  				sawInsecure = true
	1481  			} else if sawInsecure {
	1482  				t.Errorf("%#04x: secure suite after insecure one(s)", id)
	1483  			}
	1484  
	1485  			if http2isBadCipher(id) {
	1486  				sawBad = true
	1487  			} else if sawBad {
	1488  				t.Errorf("%#04x: non-bad suite after bad HTTP/2 one(s)", id)
	1489  			}
	1490  		}
	1491  
	1492  		// Check that the list is sorted according to the documented criteria.
	1493  		isBetter := func(a, b int) bool {
	1494  			aSuite, bSuite := cipherSuiteByID(prefOrder[a]), cipherSuiteByID(prefOrder[b])
	1495  			aName, bName := CipherSuiteName(prefOrder[a]), CipherSuiteName(prefOrder[b])
	1496  			// * < RC4
	1497  			if !strings.Contains(aName, "RC4") && strings.Contains(bName, "RC4") {
	1498  				return true
	1499  			} else if strings.Contains(aName, "RC4") && !strings.Contains(bName, "RC4") {
	1500  				return false
	1501  			}
	1502  			// * < CBC_SHA256
	1503  			if !strings.Contains(aName, "CBC_SHA256") && strings.Contains(bName, "CBC_SHA256") {
	1504  				return true
	1505  			} else if strings.Contains(aName, "CBC_SHA256") && !strings.Contains(bName, "CBC_SHA256") {
	1506  				return false
	1507  			}
	1508  			// * < 3DES
	1509  			if !strings.Contains(aName, "3DES") && strings.Contains(bName, "3DES") {
	1510  				return true
	1511  			} else if strings.Contains(aName, "3DES") && !strings.Contains(bName, "3DES") {
	1512  				return false
	1513  			}
	1514  			// ECDHE < *
	1515  			if aSuite.flags&suiteECDHE != 0 && bSuite.flags&suiteECDHE == 0 {
	1516  				return true
	1517  			} else if aSuite.flags&suiteECDHE == 0 && bSuite.flags&suiteECDHE != 0 {
	1518  				return false
	1519  			}
	1520  			// AEAD < CBC
	1521  			if aSuite.aead != nil && bSuite.aead == nil {
	1522  				return true
	1523  			} else if aSuite.aead == nil && bSuite.aead != nil {
	1524  				return false
	1525  			}
	1526  			// AES < ChaCha20
	1527  			if strings.Contains(aName, "AES") && strings.Contains(bName, "CHACHA20") {
	1528  				return i == 0 // true for cipherSuitesPreferenceOrder
	1529  			} else if strings.Contains(aName, "CHACHA20") && strings.Contains(bName, "AES") {
	1530  				return i != 0 // true for cipherSuitesPreferenceOrderNoAES
	1531  			}
	1532  			// AES-128 < AES-256
	1533  			if strings.Contains(aName, "AES_128") && strings.Contains(bName, "AES_256") {
	1534  				return true
	1535  			} else if strings.Contains(aName, "AES_256") && strings.Contains(bName, "AES_128") {
	1536  				return false
	1537  			}
	1538  			// ECDSA < RSA
	1539  			if aSuite.flags&suiteECSign != 0 && bSuite.flags&suiteECSign == 0 {
	1540  				return true
	1541  			} else if aSuite.flags&suiteECSign == 0 && bSuite.flags&suiteECSign != 0 {
	1542  				return false
	1543  			}
	1544  			t.Fatalf("two ciphersuites are equal by all criteria: %v and %v", aName, bName)
	1545  			panic("unreachable")
	1546  		}
	1547  		if !sort.SliceIsSorted(prefOrder, isBetter) {
	1548  			t.Error("preference order is not sorted according to the rules")
	1549  		}
	1550  	}
	1551  }
	1552  
	1553  // http2isBadCipher is copied from net/http.
	1554  // TODO: if it ends up exposed somewhere, use that instead.
	1555  func http2isBadCipher(cipher uint16) bool {
	1556  	switch cipher {
	1557  	case TLS_RSA_WITH_RC4_128_SHA,
	1558  		TLS_RSA_WITH_3DES_EDE_CBC_SHA,
	1559  		TLS_RSA_WITH_AES_128_CBC_SHA,
	1560  		TLS_RSA_WITH_AES_256_CBC_SHA,
	1561  		TLS_RSA_WITH_AES_128_CBC_SHA256,
	1562  		TLS_RSA_WITH_AES_128_GCM_SHA256,
	1563  		TLS_RSA_WITH_AES_256_GCM_SHA384,
	1564  		TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
	1565  		TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
	1566  		TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
	1567  		TLS_ECDHE_RSA_WITH_RC4_128_SHA,
	1568  		TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
	1569  		TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
	1570  		TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
	1571  		TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
	1572  		TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256:
	1573  		return true
	1574  	default:
	1575  		return false
	1576  	}
	1577  }
	1578  
	1579  type brokenSigner struct{ crypto.Signer }
	1580  
	1581  func (s brokenSigner) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) (signature []byte, err error) {
	1582  	// Replace opts with opts.HashFunc(), so rsa.PSSOptions are discarded.
	1583  	return s.Signer.Sign(rand, digest, opts.HashFunc())
	1584  }
	1585  
	1586  // TestPKCS1OnlyCert uses a client certificate with a broken crypto.Signer that
	1587  // always makes PKCS #1 v1.5 signatures, so can't be used with RSA-PSS.
	1588  func TestPKCS1OnlyCert(t *testing.T) {
	1589  	clientConfig := testConfig.Clone()
	1590  	clientConfig.Certificates = []Certificate{{
	1591  		Certificate: [][]byte{testRSACertificate},
	1592  		PrivateKey:	brokenSigner{testRSAPrivateKey},
	1593  	}}
	1594  	serverConfig := testConfig.Clone()
	1595  	serverConfig.MaxVersion = VersionTLS12 // TLS 1.3 doesn't support PKCS #1 v1.5
	1596  	serverConfig.ClientAuth = RequireAnyClientCert
	1597  
	1598  	// If RSA-PSS is selected, the handshake should fail.
	1599  	if _, _, err := testHandshake(t, clientConfig, serverConfig); err == nil {
	1600  		t.Fatal("expected broken certificate to cause connection to fail")
	1601  	}
	1602  
	1603  	clientConfig.Certificates[0].SupportedSignatureAlgorithms =
	1604  		[]SignatureScheme{PKCS1WithSHA1, PKCS1WithSHA256}
	1605  
	1606  	// But if the certificate restricts supported algorithms, RSA-PSS should not
	1607  	// be selected, and the handshake should succeed.
	1608  	if _, _, err := testHandshake(t, clientConfig, serverConfig); err != nil {
	1609  		t.Error(err)
	1610  	}
	1611  }
	1612  

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