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Source file src/crypto/ecdh/ecdh_test.go

Documentation: crypto/ecdh

     1  // Copyright 2022 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 ecdh_test
     6  
     7  import (
     8  	"bytes"
     9  	"crypto"
    10  	"crypto/cipher"
    11  	"crypto/ecdh"
    12  	"crypto/rand"
    13  	"crypto/sha256"
    14  	"encoding/hex"
    15  	"fmt"
    16  	"internal/testenv"
    17  	"io"
    18  	"os"
    19  	"os/exec"
    20  	"path/filepath"
    21  	"regexp"
    22  	"strings"
    23  	"testing"
    24  
    25  	"golang.org/x/crypto/chacha20"
    26  )
    27  
    28  // Check that PublicKey and PrivateKey implement the interfaces documented in
    29  // crypto.PublicKey and crypto.PrivateKey.
    30  var _ interface {
    31  	Equal(x crypto.PublicKey) bool
    32  } = &ecdh.PublicKey{}
    33  var _ interface {
    34  	Public() crypto.PublicKey
    35  	Equal(x crypto.PrivateKey) bool
    36  } = &ecdh.PrivateKey{}
    37  
    38  func TestECDH(t *testing.T) {
    39  	testAllCurves(t, func(t *testing.T, curve ecdh.Curve) {
    40  		aliceKey, err := curve.GenerateKey(rand.Reader)
    41  		if err != nil {
    42  			t.Fatal(err)
    43  		}
    44  		bobKey, err := curve.GenerateKey(rand.Reader)
    45  		if err != nil {
    46  			t.Fatal(err)
    47  		}
    48  
    49  		alicePubKey, err := curve.NewPublicKey(aliceKey.PublicKey().Bytes())
    50  		if err != nil {
    51  			t.Error(err)
    52  		}
    53  		if !bytes.Equal(aliceKey.PublicKey().Bytes(), alicePubKey.Bytes()) {
    54  			t.Error("encoded and decoded public keys are different")
    55  		}
    56  		if !aliceKey.PublicKey().Equal(alicePubKey) {
    57  			t.Error("encoded and decoded public keys are different")
    58  		}
    59  
    60  		alicePrivKey, err := curve.NewPrivateKey(aliceKey.Bytes())
    61  		if err != nil {
    62  			t.Error(err)
    63  		}
    64  		if !bytes.Equal(aliceKey.Bytes(), alicePrivKey.Bytes()) {
    65  			t.Error("encoded and decoded private keys are different")
    66  		}
    67  		if !aliceKey.Equal(alicePrivKey) {
    68  			t.Error("encoded and decoded private keys are different")
    69  		}
    70  
    71  		bobSecret, err := bobKey.ECDH(aliceKey.PublicKey())
    72  		if err != nil {
    73  			t.Fatal(err)
    74  		}
    75  		aliceSecret, err := aliceKey.ECDH(bobKey.PublicKey())
    76  		if err != nil {
    77  			t.Fatal(err)
    78  		}
    79  
    80  		if !bytes.Equal(bobSecret, aliceSecret) {
    81  			t.Error("two ECDH computations came out different")
    82  		}
    83  	})
    84  }
    85  
    86  type countingReader struct {
    87  	r io.Reader
    88  	n int
    89  }
    90  
    91  func (r *countingReader) Read(p []byte) (int, error) {
    92  	n, err := r.r.Read(p)
    93  	r.n += n
    94  	return n, err
    95  }
    96  
    97  func TestGenerateKey(t *testing.T) {
    98  	testAllCurves(t, func(t *testing.T, curve ecdh.Curve) {
    99  		r := &countingReader{r: rand.Reader}
   100  		k, err := curve.GenerateKey(r)
   101  		if err != nil {
   102  			t.Fatal(err)
   103  		}
   104  
   105  		// GenerateKey does rejection sampling. If the masking works correctly,
   106  		// the probability of a rejection is 1-ord(G)/2^ceil(log2(ord(G))),
   107  		// which for all curves is small enough (at most 2^-32, for P-256) that
   108  		// a bit flip is more likely to make this test fail than bad luck.
   109  		// Account for the extra MaybeReadByte byte, too.
   110  		if got, expected := r.n, len(k.Bytes())+1; got > expected {
   111  			t.Errorf("expected GenerateKey to consume at most %v bytes, got %v", expected, got)
   112  		}
   113  	})
   114  }
   115  
   116  var vectors = map[ecdh.Curve]struct {
   117  	PrivateKey, PublicKey string
   118  	PeerPublicKey         string
   119  	SharedSecret          string
   120  }{
   121  	// NIST vectors from CAVS 14.1, ECC CDH Primitive (SP800-56A).
   122  	ecdh.P256(): {
   123  		PrivateKey: "7d7dc5f71eb29ddaf80d6214632eeae03d9058af1fb6d22ed80badb62bc1a534",
   124  		PublicKey: "04ead218590119e8876b29146ff89ca61770c4edbbf97d38ce385ed281d8a6b230" +
   125  			"28af61281fd35e2fa7002523acc85a429cb06ee6648325389f59edfce1405141",
   126  		PeerPublicKey: "04700c48f77f56584c5cc632ca65640db91b6bacce3a4df6b42ce7cc838833d287" +
   127  			"db71e509e3fd9b060ddb20ba5c51dcc5948d46fbf640dfe0441782cab85fa4ac",
   128  		SharedSecret: "46fc62106420ff012e54a434fbdd2d25ccc5852060561e68040dd7778997bd7b",
   129  	},
   130  	ecdh.P384(): {
   131  		PrivateKey: "3cc3122a68f0d95027ad38c067916ba0eb8c38894d22e1b15618b6818a661774ad463b205da88cf699ab4d43c9cf98a1",
   132  		PublicKey: "049803807f2f6d2fd966cdd0290bd410c0190352fbec7ff6247de1302df86f25d34fe4a97bef60cff548355c015dbb3e5f" +
   133  			"ba26ca69ec2f5b5d9dad20cc9da711383a9dbe34ea3fa5a2af75b46502629ad54dd8b7d73a8abb06a3a3be47d650cc99",
   134  		PeerPublicKey: "04a7c76b970c3b5fe8b05d2838ae04ab47697b9eaf52e764592efda27fe7513272734466b400091adbf2d68c58e0c50066" +
   135  			"ac68f19f2e1cb879aed43a9969b91a0839c4c38a49749b661efedf243451915ed0905a32b060992b468c64766fc8437a",
   136  		SharedSecret: "5f9d29dc5e31a163060356213669c8ce132e22f57c9a04f40ba7fcead493b457e5621e766c40a2e3d4d6a04b25e533f1",
   137  	},
   138  	// For some reason all field elements in the test vector (both scalars and
   139  	// base field elements), but not the shared secret output, have two extra
   140  	// leading zero bytes (which in big-endian are irrelevant). Removed here.
   141  	ecdh.P521(): {
   142  		PrivateKey: "017eecc07ab4b329068fba65e56a1f8890aa935e57134ae0ffcce802735151f4eac6564f6ee9974c5e6887a1fefee5743ae2241bfeb95d5ce31ddcb6f9edb4d6fc47",
   143  		PublicKey: "0400602f9d0cf9e526b29e22381c203c48a886c2b0673033366314f1ffbcba240ba42f4ef38a76174635f91e6b4ed34275eb01c8467d05ca80315bf1a7bbd945f550a5" +
   144  			"01b7c85f26f5d4b2d7355cf6b02117659943762b6d1db5ab4f1dbc44ce7b2946eb6c7de342962893fd387d1b73d7a8672d1f236961170b7eb3579953ee5cdc88cd2d",
   145  		PeerPublicKey: "0400685a48e86c79f0f0875f7bc18d25eb5fc8c0b07e5da4f4370f3a9490340854334b1e1b87fa395464c60626124a4e70d0f785601d37c09870ebf176666877a2046d" +
   146  			"01ba52c56fc8776d9e8f5db4f0cc27636d0b741bbe05400697942e80b739884a83bde99e0f6716939e632bc8986fa18dccd443a348b6c3e522497955a4f3c302f676",
   147  		SharedSecret: "005fc70477c3e63bc3954bd0df3ea0d1f41ee21746ed95fc5e1fdf90930d5e136672d72cc770742d1711c3c3a4c334a0ad9759436a4d3c5bf6e74b9578fac148c831",
   148  	},
   149  	// X25519 test vector from RFC 7748, Section 6.1.
   150  	ecdh.X25519(): {
   151  		PrivateKey:    "77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a",
   152  		PublicKey:     "8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a",
   153  		PeerPublicKey: "de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f",
   154  		SharedSecret:  "4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742",
   155  	},
   156  }
   157  
   158  func TestVectors(t *testing.T) {
   159  	testAllCurves(t, func(t *testing.T, curve ecdh.Curve) {
   160  		v := vectors[curve]
   161  		key, err := curve.NewPrivateKey(hexDecode(t, v.PrivateKey))
   162  		if err != nil {
   163  			t.Fatal(err)
   164  		}
   165  		if !bytes.Equal(key.PublicKey().Bytes(), hexDecode(t, v.PublicKey)) {
   166  			t.Error("public key derived from the private key does not match")
   167  		}
   168  		peer, err := curve.NewPublicKey(hexDecode(t, v.PeerPublicKey))
   169  		if err != nil {
   170  			t.Fatal(err)
   171  		}
   172  		secret, err := key.ECDH(peer)
   173  		if err != nil {
   174  			t.Fatal(err)
   175  		}
   176  		if !bytes.Equal(secret, hexDecode(t, v.SharedSecret)) {
   177  			t.Errorf("shared secret does not match: %x %x %s %x", secret, sha256.Sum256(secret), v.SharedSecret,
   178  				sha256.Sum256(hexDecode(t, v.SharedSecret)))
   179  		}
   180  	})
   181  }
   182  
   183  func hexDecode(t *testing.T, s string) []byte {
   184  	b, err := hex.DecodeString(s)
   185  	if err != nil {
   186  		t.Fatal("invalid hex string:", s)
   187  	}
   188  	return b
   189  }
   190  
   191  func TestString(t *testing.T) {
   192  	testAllCurves(t, func(t *testing.T, curve ecdh.Curve) {
   193  		s := fmt.Sprintf("%s", curve)
   194  		if s[:1] != "P" && s[:1] != "X" {
   195  			t.Errorf("unexpected Curve string encoding: %q", s)
   196  		}
   197  	})
   198  }
   199  
   200  func TestX25519Failure(t *testing.T) {
   201  	identity := hexDecode(t, "0000000000000000000000000000000000000000000000000000000000000000")
   202  	lowOrderPoint := hexDecode(t, "e0eb7a7c3b41b8ae1656e3faf19fc46ada098deb9c32b1fd866205165f49b800")
   203  	randomScalar := make([]byte, 32)
   204  	rand.Read(randomScalar)
   205  
   206  	t.Run("identity point", func(t *testing.T) { testX25519Failure(t, randomScalar, identity) })
   207  	t.Run("low order point", func(t *testing.T) { testX25519Failure(t, randomScalar, lowOrderPoint) })
   208  }
   209  
   210  func testX25519Failure(t *testing.T, private, public []byte) {
   211  	priv, err := ecdh.X25519().NewPrivateKey(private)
   212  	if err != nil {
   213  		t.Fatal(err)
   214  	}
   215  	pub, err := ecdh.X25519().NewPublicKey(public)
   216  	if err != nil {
   217  		t.Fatal(err)
   218  	}
   219  	secret, err := priv.ECDH(pub)
   220  	if err == nil {
   221  		t.Error("expected ECDH error")
   222  	}
   223  	if secret != nil {
   224  		t.Errorf("unexpected ECDH output: %x", secret)
   225  	}
   226  }
   227  
   228  var invalidPrivateKeys = map[ecdh.Curve][]string{
   229  	ecdh.P256(): {
   230  		// Bad lengths.
   231  		"",
   232  		"01",
   233  		"01010101010101010101010101010101010101010101010101010101010101",
   234  		"000101010101010101010101010101010101010101010101010101010101010101",
   235  		strings.Repeat("01", 200),
   236  		// Zero.
   237  		"0000000000000000000000000000000000000000000000000000000000000000",
   238  		// Order of the curve and above.
   239  		"ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551",
   240  		"ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632552",
   241  		"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
   242  	},
   243  	ecdh.P384(): {
   244  		// Bad lengths.
   245  		"",
   246  		"01",
   247  		"0101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101",
   248  		"00010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101",
   249  		strings.Repeat("01", 200),
   250  		// Zero.
   251  		"000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
   252  		// Order of the curve and above.
   253  		"ffffffffffffffffffffffffffffffffffffffffffffffffc7634d81f4372ddf581a0db248b0a77aecec196accc52973",
   254  		"ffffffffffffffffffffffffffffffffffffffffffffffffc7634d81f4372ddf581a0db248b0a77aecec196accc52974",
   255  		"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
   256  	},
   257  	ecdh.P521(): {
   258  		// Bad lengths.
   259  		"",
   260  		"01",
   261  		"0101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101",
   262  		"00010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101",
   263  		strings.Repeat("01", 200),
   264  		// Zero.
   265  		"000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
   266  		// Order of the curve and above.
   267  		"01fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e91386409",
   268  		"01fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e9138640a",
   269  		"11fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e91386409",
   270  		"03fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff4a30d0f077e5f2cd6ff980291ee134ba0776b937113388f5d76df6e3d2270c812",
   271  	},
   272  	ecdh.X25519(): {
   273  		// X25519 only rejects bad lengths.
   274  		"",
   275  		"01",
   276  		"01010101010101010101010101010101010101010101010101010101010101",
   277  		"000101010101010101010101010101010101010101010101010101010101010101",
   278  		strings.Repeat("01", 200),
   279  	},
   280  }
   281  
   282  func TestNewPrivateKey(t *testing.T) {
   283  	testAllCurves(t, func(t *testing.T, curve ecdh.Curve) {
   284  		for _, input := range invalidPrivateKeys[curve] {
   285  			k, err := curve.NewPrivateKey(hexDecode(t, input))
   286  			if err == nil {
   287  				t.Errorf("unexpectedly accepted %q", input)
   288  			} else if k != nil {
   289  				t.Error("PrivateKey was not nil on error")
   290  			} else if strings.Contains(err.Error(), "boringcrypto") {
   291  				t.Errorf("boringcrypto error leaked out: %v", err)
   292  			}
   293  		}
   294  	})
   295  }
   296  
   297  var invalidPublicKeys = map[ecdh.Curve][]string{
   298  	ecdh.P256(): {
   299  		// Bad lengths.
   300  		"",
   301  		"04",
   302  		strings.Repeat("04", 200),
   303  		// Infinity.
   304  		"00",
   305  		// Compressed encodings.
   306  		"036b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296",
   307  		"02e2534a3532d08fbba02dde659ee62bd0031fe2db785596ef509302446b030852",
   308  		// Points not on the curve.
   309  		"046b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c2964fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f6",
   310  		"0400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
   311  	},
   312  	ecdh.P384(): {
   313  		// Bad lengths.
   314  		"",
   315  		"04",
   316  		strings.Repeat("04", 200),
   317  		// Infinity.
   318  		"00",
   319  		// Compressed encodings.
   320  		"03aa87ca22be8b05378eb1c71ef320ad746e1d3b628ba79b9859f741e082542a385502f25dbf55296c3a545e3872760ab7",
   321  		"0208d999057ba3d2d969260045c55b97f089025959a6f434d651d207d19fb96e9e4fe0e86ebe0e64f85b96a9c75295df61",
   322  		// Points not on the curve.
   323  		"04aa87ca22be8b05378eb1c71ef320ad746e1d3b628ba79b9859f741e082542a385502f25dbf55296c3a545e3872760ab73617de4a96262c6f5d9e98bf9292dc29f8f41dbd289a147ce9da3113b5f0b8c00a60b1ce1d7e819d7a431d7c90ea0e60",
   324  		"04000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
   325  	},
   326  	ecdh.P521(): {
   327  		// Bad lengths.
   328  		"",
   329  		"04",
   330  		strings.Repeat("04", 200),
   331  		// Infinity.
   332  		"00",
   333  		// Compressed encodings.
   334  		"030035b5df64ae2ac204c354b483487c9070cdc61c891c5ff39afc06c5d55541d3ceac8659e24afe3d0750e8b88e9f078af066a1d5025b08e5a5e2fbc87412871902f3",
   335  		"0200c6858e06b70404e9cd9e3ecb662395b4429c648139053fb521f828af606b4d3dbaa14b5e77efe75928fe1dc127a2ffa8de3348b3c1856a429bf97e7e31c2e5bd66",
   336  		// Points not on the curve.
   337  		"0400c6858e06b70404e9cd9e3ecb662395b4429c648139053fb521f828af606b4d3dbaa14b5e77efe75928fe1dc127a2ffa8de3348b3c1856a429bf97e7e31c2e5bd66011839296a789a3bc0045c8a5fb42c7d1bd998f54449579b446817afbd17273e662c97ee72995ef42640c550b9013fad0761353c7086a272c24088be94769fd16651",
   338  		"04000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
   339  	},
   340  	ecdh.X25519(): {},
   341  }
   342  
   343  func TestNewPublicKey(t *testing.T) {
   344  	testAllCurves(t, func(t *testing.T, curve ecdh.Curve) {
   345  		for _, input := range invalidPublicKeys[curve] {
   346  			k, err := curve.NewPublicKey(hexDecode(t, input))
   347  			if err == nil {
   348  				t.Errorf("unexpectedly accepted %q", input)
   349  			} else if k != nil {
   350  				t.Error("PublicKey was not nil on error")
   351  			} else if strings.Contains(err.Error(), "boringcrypto") {
   352  				t.Errorf("boringcrypto error leaked out: %v", err)
   353  			}
   354  		}
   355  	})
   356  }
   357  
   358  func testAllCurves(t *testing.T, f func(t *testing.T, curve ecdh.Curve)) {
   359  	t.Run("P256", func(t *testing.T) { f(t, ecdh.P256()) })
   360  	t.Run("P384", func(t *testing.T) { f(t, ecdh.P384()) })
   361  	t.Run("P521", func(t *testing.T) { f(t, ecdh.P521()) })
   362  	t.Run("X25519", func(t *testing.T) { f(t, ecdh.X25519()) })
   363  }
   364  
   365  func BenchmarkECDH(b *testing.B) {
   366  	benchmarkAllCurves(b, func(b *testing.B, curve ecdh.Curve) {
   367  		c, err := chacha20.NewUnauthenticatedCipher(make([]byte, 32), make([]byte, 12))
   368  		if err != nil {
   369  			b.Fatal(err)
   370  		}
   371  		rand := cipher.StreamReader{
   372  			S: c, R: zeroReader,
   373  		}
   374  
   375  		peerKey, err := curve.GenerateKey(rand)
   376  		if err != nil {
   377  			b.Fatal(err)
   378  		}
   379  		peerShare := peerKey.PublicKey().Bytes()
   380  		b.ResetTimer()
   381  		b.ReportAllocs()
   382  
   383  		var allocationsSink byte
   384  
   385  		for i := 0; i < b.N; i++ {
   386  			key, err := curve.GenerateKey(rand)
   387  			if err != nil {
   388  				b.Fatal(err)
   389  			}
   390  			share := key.PublicKey().Bytes()
   391  			peerPubKey, err := curve.NewPublicKey(peerShare)
   392  			if err != nil {
   393  				b.Fatal(err)
   394  			}
   395  			secret, err := key.ECDH(peerPubKey)
   396  			if err != nil {
   397  				b.Fatal(err)
   398  			}
   399  			allocationsSink ^= secret[0] ^ share[0]
   400  		}
   401  	})
   402  }
   403  
   404  func benchmarkAllCurves(b *testing.B, f func(b *testing.B, curve ecdh.Curve)) {
   405  	b.Run("P256", func(b *testing.B) { f(b, ecdh.P256()) })
   406  	b.Run("P384", func(b *testing.B) { f(b, ecdh.P384()) })
   407  	b.Run("P521", func(b *testing.B) { f(b, ecdh.P521()) })
   408  	b.Run("X25519", func(b *testing.B) { f(b, ecdh.X25519()) })
   409  }
   410  
   411  type zr struct{}
   412  
   413  // Read replaces the contents of dst with zeros. It is safe for concurrent use.
   414  func (zr) Read(dst []byte) (n int, err error) {
   415  	clear(dst)
   416  	return len(dst), nil
   417  }
   418  
   419  var zeroReader = zr{}
   420  
   421  const linkerTestProgram = `
   422  package main
   423  import "crypto/ecdh"
   424  import "crypto/rand"
   425  func main() {
   426  	curve := ecdh.P384()
   427  	key, err := curve.GenerateKey(rand.Reader)
   428  	if err != nil { panic(err) }
   429  	_, err = curve.NewPublicKey(key.PublicKey().Bytes())
   430  	if err != nil { panic(err) }
   431  	_, err = curve.NewPrivateKey(key.Bytes())
   432  	if err != nil { panic(err) }
   433  	_, err = key.ECDH(key.PublicKey())
   434  	if err != nil { panic(err) }
   435  	println("OK")
   436  }
   437  `
   438  
   439  // TestLinker ensures that using one curve does not bring all other
   440  // implementations into the binary. This also guarantees that govulncheck can
   441  // avoid warning about a curve-specific vulnerability if that curve is not used.
   442  func TestLinker(t *testing.T) {
   443  	if testing.Short() {
   444  		t.Skip("test requires running 'go build'")
   445  	}
   446  	testenv.MustHaveGoBuild(t)
   447  
   448  	dir := t.TempDir()
   449  	hello := filepath.Join(dir, "hello.go")
   450  	err := os.WriteFile(hello, []byte(linkerTestProgram), 0664)
   451  	if err != nil {
   452  		t.Fatal(err)
   453  	}
   454  
   455  	run := func(args ...string) string {
   456  		cmd := exec.Command(args[0], args[1:]...)
   457  		cmd.Dir = dir
   458  		out, err := cmd.CombinedOutput()
   459  		if err != nil {
   460  			t.Fatalf("%v: %v\n%s", args, err, string(out))
   461  		}
   462  		return string(out)
   463  	}
   464  
   465  	goBin := testenv.GoToolPath(t)
   466  	run(goBin, "build", "-o", "hello.exe", "hello.go")
   467  	if out := run("./hello.exe"); out != "OK\n" {
   468  		t.Error("unexpected output:", out)
   469  	}
   470  
   471  	// List all text symbols under crypto/... and make sure there are some for
   472  	// P384, but none for the other curves.
   473  	var consistent bool
   474  	nm := run(goBin, "tool", "nm", "hello.exe")
   475  	for _, match := range regexp.MustCompile(`(?m)T (crypto/.*)$`).FindAllStringSubmatch(nm, -1) {
   476  		symbol := strings.ToLower(match[1])
   477  		if strings.Contains(symbol, "p384") {
   478  			consistent = true
   479  		}
   480  		if strings.Contains(symbol, "p224") || strings.Contains(symbol, "p256") || strings.Contains(symbol, "p521") {
   481  			t.Errorf("unexpected symbol in program using only ecdh.P384: %s", match[1])
   482  		}
   483  	}
   484  	if !consistent {
   485  		t.Error("no P384 symbols found in program using ecdh.P384, test is broken")
   486  	}
   487  }
   488  
   489  func TestMismatchedCurves(t *testing.T) {
   490  	curves := []struct {
   491  		name  string
   492  		curve ecdh.Curve
   493  	}{
   494  		{"P256", ecdh.P256()},
   495  		{"P384", ecdh.P384()},
   496  		{"P521", ecdh.P521()},
   497  		{"X25519", ecdh.X25519()},
   498  	}
   499  
   500  	for _, privCurve := range curves {
   501  		priv, err := privCurve.curve.GenerateKey(rand.Reader)
   502  		if err != nil {
   503  			t.Fatalf("failed to generate test key: %s", err)
   504  		}
   505  
   506  		for _, pubCurve := range curves {
   507  			if privCurve == pubCurve {
   508  				continue
   509  			}
   510  			t.Run(fmt.Sprintf("%s/%s", privCurve.name, pubCurve.name), func(t *testing.T) {
   511  				pub, err := pubCurve.curve.GenerateKey(rand.Reader)
   512  				if err != nil {
   513  					t.Fatalf("failed to generate test key: %s", err)
   514  				}
   515  				expected := "crypto/ecdh: private key and public key curves do not match"
   516  				_, err = priv.ECDH(pub.PublicKey())
   517  				if err.Error() != expected {
   518  					t.Fatalf("unexpected error: want %q, got %q", expected, err)
   519  				}
   520  			})
   521  		}
   522  	}
   523  }
   524  

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