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ecdh1pu_test.go
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ecdh1pu_test.go
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package exchange
import (
"bytes"
"crypto/ecdsa"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"hash"
"reflect"
"testing"
"golang.org/x/crypto/blake2b"
"gopkg.in/square/go-jose.v2"
)
// Values from https://tools.ietf.org/id/draft-madden-jose-ecdh-1pu-03.html
var (
// Static Alice Private/Public Key
aliceStaticJWK = mustJWK([]byte(`{"kty":"EC", "crv":"P-256", "x":"WKn-ZIGevcwGIyyrzFoZNBdaq9_TsqzGl96oc0CWuis", "y":"y77t-RvAHRKTsSGdIYUfweuOvwrvDD-Q3Hv5J0fSKbE", "d":"Hndv7ZZjs_ke8o9zXYo3iq-Yr8SewI5vrqd0pAvEPqg"}`))
// Ephemeral Alice Private/Public Key
aliceEphemeralJWK = mustJWK([]byte(`{"kty":"EC", "crv":"P-256", "x":"gI0GAILBdu7T53akrFmMyGcsF3n5dO7MmwNBHKW5SV0", "y":"SLW_xSffzlPWrHEVI30DHM_4egVwt3NQqeUD7nMFpps", "d":"0_NxaRPUMQoAJt50Gz8YiTr8gRTwyEaCumd-MToTmIo"}`))
// Static Bob Public Key
bobStaticJWK = mustJWK([]byte(`{"kty":"EC", "crv":"P-256", "x":"weNJy2HscCSM6AEDTDg04biOvhFhyyWvOHQfeF_PxMQ", "y":"e8lnCO-AlStT-NJVX-crhB7QRYhiix03illJOVAOyck", "d":"VEmDZpDXXK8p8N0Cndsxs924q6nS1RXFASRl6BfUqdw"}`))
)
// mustJWK decodes JWK encoded keys and panic if decode fail.
func mustJWK(data []byte) *jose.JSONWebKey {
var key jose.JSONWebKey
if err := json.NewDecoder(bytes.NewReader(data)).Decode(&key); err != nil {
panic(err)
}
return &key
}
func mustBase64UrlDecode(input string) []byte {
out, err := base64.RawURLEncoding.DecodeString(input)
if err != nil {
panic(err)
}
return out
}
func Test_ecdh1PuExchange_SecretKey(t *testing.T) {
type fields struct {
ourPrivate *ecdsa.PrivateKey
algorithmID []byte
dkLenBits uint32
partyInfo []byte
h func() hash.Hash
}
type args struct {
ephemeralPrivateKey *ecdsa.PrivateKey
theirPublicKey *ecdsa.PublicKey
theirAgreementInfo []byte
}
tests := []struct {
name string
fields fields
args args
want []byte
wantErr bool
}{
{
name: "nil",
wantErr: true,
},
{
name: "fields: missing private key",
fields: fields{
ourPrivate: nil,
algorithmID: []byte("A256GCM"),
dkLenBits: 256,
partyInfo: []byte("Alice"),
h: sha256.New,
},
args: args{
ephemeralPrivateKey: aliceEphemeralJWK.Key.(*ecdsa.PrivateKey),
theirAgreementInfo: []byte("Bob"),
theirPublicKey: bobStaticJWK.Public().Key.(*ecdsa.PublicKey),
},
wantErr: true,
},
{
name: "fields: missing hash function",
fields: fields{
ourPrivate: aliceStaticJWK.Key.(*ecdsa.PrivateKey),
algorithmID: []byte("A256GCM"),
dkLenBits: 256,
partyInfo: []byte("Alice"),
h: nil,
},
args: args{
ephemeralPrivateKey: aliceEphemeralJWK.Key.(*ecdsa.PrivateKey),
theirAgreementInfo: []byte("Bob"),
theirPublicKey: bobStaticJWK.Public().Key.(*ecdsa.PublicKey),
},
wantErr: true,
},
{
name: "args: missing ephemeral key",
fields: fields{
ourPrivate: aliceStaticJWK.Key.(*ecdsa.PrivateKey),
algorithmID: []byte("A256GCM"),
dkLenBits: 256,
partyInfo: []byte("Alice"),
h: sha256.New,
},
args: args{
ephemeralPrivateKey: nil,
theirAgreementInfo: []byte("Bob"),
theirPublicKey: bobStaticJWK.Public().Key.(*ecdsa.PublicKey),
},
wantErr: true,
},
{
name: "args: missing public key",
fields: fields{
ourPrivate: aliceStaticJWK.Key.(*ecdsa.PrivateKey),
algorithmID: []byte("A256GCM"),
dkLenBits: 256,
partyInfo: []byte("Alice"),
h: sha256.New,
},
args: args{
ephemeralPrivateKey: aliceEphemeralJWK.Key.(*ecdsa.PrivateKey),
theirAgreementInfo: []byte("Bob"),
theirPublicKey: nil,
},
wantErr: true,
},
{
name: "valid: ECDH-1PU+SHA256+A128GCM",
fields: fields{
ourPrivate: aliceStaticJWK.Key.(*ecdsa.PrivateKey),
algorithmID: []byte("A128GCM"),
dkLenBits: 128,
partyInfo: []byte("Alice"),
h: sha256.New,
},
args: args{
ephemeralPrivateKey: aliceEphemeralJWK.Key.(*ecdsa.PrivateKey),
theirAgreementInfo: []byte("Bob"),
theirPublicKey: bobStaticJWK.Public().Key.(*ecdsa.PublicKey),
},
wantErr: false,
want: mustBase64UrlDecode("AiVWJdYQJPxPu-lJu_OkeA"),
},
{
name: "valid: ECDH-1PU+SHA256+A192GCM",
fields: fields{
ourPrivate: aliceStaticJWK.Key.(*ecdsa.PrivateKey),
algorithmID: []byte("A192GCM"),
dkLenBits: 192,
partyInfo: []byte("Alice"),
h: sha256.New,
},
args: args{
ephemeralPrivateKey: aliceEphemeralJWK.Key.(*ecdsa.PrivateKey),
theirAgreementInfo: []byte("Bob"),
theirPublicKey: bobStaticJWK.Public().Key.(*ecdsa.PublicKey),
},
wantErr: false,
want: mustBase64UrlDecode("IXAgU5hhkaK5wGiPzFcP2ho3qPLjqSAZ"),
},
{
name: "valid: ECDH-1PU+SHA256+A256GCM",
fields: fields{
ourPrivate: aliceStaticJWK.Key.(*ecdsa.PrivateKey),
algorithmID: []byte("A256GCM"),
dkLenBits: 256,
partyInfo: []byte("Alice"),
h: sha256.New,
},
args: args{
ephemeralPrivateKey: aliceEphemeralJWK.Key.(*ecdsa.PrivateKey),
theirAgreementInfo: []byte("Bob"),
theirPublicKey: bobStaticJWK.Public().Key.(*ecdsa.PublicKey),
},
wantErr: false,
want: mustBase64UrlDecode("bK8Tcj0UhQrUtCzW3ek1v_0v_wCpunDeBcIDpeFyLKc"),
},
{
name: "valid: ECDH-1PU+B2B256+A256GCM",
fields: fields{
ourPrivate: aliceStaticJWK.Key.(*ecdsa.PrivateKey),
algorithmID: []byte("A256GCM"),
dkLenBits: 256,
partyInfo: []byte("Alice"),
h: func() hash.Hash {
// Idea blake2b key could be used as a preshared key for encryption key derivation.
hasher, err := blake2b.New256(nil)
if err != nil {
panic(err)
}
return hasher
},
},
args: args{
ephemeralPrivateKey: aliceEphemeralJWK.Key.(*ecdsa.PrivateKey),
theirAgreementInfo: []byte("Bob"),
theirPublicKey: bobStaticJWK.Public().Key.(*ecdsa.PublicKey),
},
wantErr: false,
want: mustBase64UrlDecode("wfW-ULXOp_4lSNyLAu2PHaQfnb-g6R6NRCiTqCh_EJ0"),
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
exchange := ECDH1PU(tt.fields.ourPrivate, tt.fields.h, tt.fields.algorithmID, tt.fields.dkLenBits, tt.fields.partyInfo)
got, err := exchange.SecretKey(tt.args.ephemeralPrivateKey, tt.args.theirPublicKey, tt.args.theirAgreementInfo)
if (err != nil) != tt.wantErr {
t.Errorf("ecdh1PuExchange.SecretKey() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("ecdh1PuExchange.SecretKey() = %v, want %v", got, tt.want)
}
})
}
}