ecdh_stdlib_test.go

Documentation: golang.org/x/crypto/internal/wycheproof

     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 wycheproof
     6  
     7  import (
     8  	"bytes"
     9  	"crypto/ecdh"
    10  	"fmt"
    11  	"testing"
    12  )
    13  
    14  func TestECDHStdLib(t *testing.T) {
    15  	type ECDHTestVector struct {
    16  		// A brief description of the test case
    17  		Comment string `json:"comment,omitempty"`
    18  		// A list of flags
    19  		Flags []string `json:"flags,omitempty"`
    20  		// the private key
    21  		Private string `json:"private,omitempty"`
    22  		// Encoded public key
    23  		Public string `json:"public,omitempty"`
    24  		// Test result
    25  		Result string `json:"result,omitempty"`
    26  		// The shared secret key
    27  		Shared string `json:"shared,omitempty"`
    28  		// Identifier of the test case
    29  		TcID int `json:"tcId,omitempty"`
    30  	}
    31  
    32  	type ECDHTestGroup struct {
    33  		Curve string            `json:"curve,omitempty"`
    34  		Tests []*ECDHTestVector `json:"tests,omitempty"`
    35  	}
    36  
    37  	type Root struct {
    38  		TestGroups []*ECDHTestGroup `json:"testGroups,omitempty"`
    39  	}
    40  
    41  	flagsShouldPass := map[string]bool{
    42  		// We don't support compressed points.
    43  		"CompressedPoint": false,
    44  		// We don't support decoding custom curves.
    45  		"UnnamedCurve": false,
    46  		// WrongOrder and UnusedParam are only found with UnnamedCurve.
    47  		"WrongOrder":  false,
    48  		"UnusedParam": false,
    49  
    50  		// X25519 specific flags
    51  		"Twist":              true,
    52  		"SmallPublicKey":     false,
    53  		"LowOrderPublic":     false,
    54  		"ZeroSharedSecret":   false,
    55  		"NonCanonicalPublic": true,
    56  	}
    57  
    58  	// curveToCurve is a map of all elliptic curves supported
    59  	// by crypto/elliptic, which can subsequently be parsed and tested.
    60  	curveToCurve := map[string]ecdh.Curve{
    61  		"secp256r1":  ecdh.P256(),
    62  		"secp384r1":  ecdh.P384(),
    63  		"secp521r1":  ecdh.P521(),
    64  		"curve25519": ecdh.X25519(),
    65  	}
    66  
    67  	curveToKeySize := map[string]int{
    68  		"secp256r1":  32,
    69  		"secp384r1":  48,
    70  		"secp521r1":  66,
    71  		"curve25519": 32,
    72  	}
    73  
    74  	for _, f := range []string{
    75  		"ecdh_secp256r1_ecpoint_test.json",
    76  		"ecdh_secp384r1_ecpoint_test.json",
    77  		"ecdh_secp521r1_ecpoint_test.json",
    78  		"x25519_test.json",
    79  	} {
    80  		var root Root
    81  		readTestVector(t, f, &root)
    82  		for _, tg := range root.TestGroups {
    83  			if _, ok := curveToCurve[tg.Curve]; !ok {
    84  				continue
    85  			}
    86  			for _, tt := range tg.Tests {
    87  				tg, tt := tg, tt
    88  				t.Run(fmt.Sprintf("%s/%d", tg.Curve, tt.TcID), func(t *testing.T) {
    89  					t.Logf("Type: %v", tt.Result)
    90  					t.Logf("Flags: %q", tt.Flags)
    91  					t.Log(tt.Comment)
    92  
    93  					shouldPass := shouldPass(tt.Result, tt.Flags, flagsShouldPass)
    94  
    95  					curve := curveToCurve[tg.Curve]
    96  					p := decodeHex(tt.Public)
    97  					pub, err := curve.NewPublicKey(p)
    98  					if err != nil {
    99  						if shouldPass {
   100  							t.Errorf("NewPublicKey: %v", err)
   101  						}
   102  						return
   103  					}
   104  
   105  					privBytes := decodeHex(tt.Private)
   106  					if len(privBytes) != curveToKeySize[tg.Curve] {
   107  						t.Skipf("non-standard key size %d", len(privBytes))
   108  					}
   109  
   110  					priv, err := curve.NewPrivateKey(privBytes)
   111  					if err != nil {
   112  						if shouldPass {
   113  							t.Errorf("NewPrivateKey: %v", err)
   114  						}
   115  						return
   116  					}
   117  
   118  					shared := decodeHex(tt.Shared)
   119  					x, err := priv.ECDH(pub)
   120  					if err != nil {
   121  						if tg.Curve == "curve25519" && !shouldPass {
   122  							// ECDH is expected to only return an error when using X25519,
   123  							// in all other cases an error is unexpected.
   124  							return
   125  						}
   126  						t.Fatalf("ECDH: %v", err)
   127  					}
   128  
   129  					if bytes.Equal(shared, x) != shouldPass {
   130  						if shouldPass {
   131  							t.Errorf("ECDH = %x, want %x", shared, x)
   132  						} else {
   133  							t.Errorf("ECDH = %x, want anything else", shared)
   134  						}
   135  					}
   136  				})
   137  			}
   138  		}
   139  	}
   140  }
   141
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