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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package subtle_test
import (
"crypto/ecdsa"
"crypto/rand"
"fmt"
"testing"
subtleSignature "github.com/tink-crypto/tink-go/v2/signature/subtle"
"github.com/tink-crypto/tink-go/v2/subtle/random"
"github.com/tink-crypto/tink-go/v2/subtle"
"github.com/tink-crypto/tink-go/v2/testutil"
)
func TestSignVerify(t *testing.T) {
data := random.GetRandomBytes(20)
hash := "SHA256"
curve := "NIST_P256"
encodings := []string{"DER", "IEEE_P1363"}
for _, encoding := range encodings {
priv, err := ecdsa.GenerateKey(subtle.GetCurve(curve), rand.Reader)
if err != nil {
t.Fatalf("ecdsa.GenerateKey() err = %q, want nil", err)
}
// Use the private key and public key directly to create new instances
signer, err := subtleSignature.NewECDSASignerFromPrivateKey(hash, encoding, priv)
if err != nil {
t.Errorf("unexpected error when creating ECDSASigner: %s", err)
}
verifier, err := subtleSignature.NewECDSAVerifierFromPublicKey(hash, encoding, &priv.PublicKey)
if err != nil {
t.Errorf("unexpected error when creating ECDSAVerifier: %s", err)
}
signature, err := signer.Sign(data)
if err != nil {
t.Errorf("unexpected error when signing: %s", err)
}
if err := verifier.Verify(signature, data); err != nil {
t.Errorf("unexpected error when verifying: %s", err)
}
// Use byte slices to create new instances
signer, err = subtleSignature.NewECDSASigner(hash, curve, encoding, priv.D.Bytes())
if err != nil {
t.Errorf("unexpected error when creating ECDSASigner: %s", err)
}
verifier, err = subtleSignature.NewECDSAVerifier(hash, curve, encoding, priv.X.Bytes(), priv.Y.Bytes())
if err != nil {
t.Errorf("unexpected error when creating ECDSAVerifier: %s", err)
}
signature, err = signer.Sign(data)
if err != nil {
t.Errorf("unexpected error when signing: %s", err)
}
if err = verifier.Verify(signature, data); err != nil {
t.Errorf("unexpected error when verifying: %s", err)
}
}
}
func TestECDSAInvalidPublicKey(t *testing.T) {
if _, err := subtleSignature.NewECDSAVerifier("SHA256", "NIST_P256", "IEEE_P1363", []byte{0, 32, 0}, []byte{0, 32}); err == nil {
t.Errorf("subtleSignature.NewECDSAVerifier() err = nil, want error")
}
}
func TestECDSAInvalidCurve(t *testing.T) {
priv, err := ecdsa.GenerateKey(subtle.GetCurve("NIST_P256"), rand.Reader)
if err != nil {
t.Fatalf("ecdsa.GenerateKey() err = %q, want nil", err)
}
if _, err := subtleSignature.NewECDSAVerifier("SHA256", "INVALID", "IEEE_P1363", priv.X.Bytes(), priv.Y.Bytes()); err == nil {
t.Errorf("subtleSignature.NewECDSAVerifier() err = nil, want error")
}
}
func TestECDSAWycheproofCases(t *testing.T) {
vectors := []struct {
Filename string
Encoding string
}{
{"ecdsa_test.json", "DER"},
{"ecdsa_secp256r1_sha256_p1363_test.json", "IEEE_P1363"},
{"ecdsa_secp384r1_sha512_p1363_test.json", "IEEE_P1363"},
{"ecdsa_secp521r1_sha512_p1363_test.json", "IEEE_P1363"},
}
for _, v := range vectors {
suite := new(ecdsaSuite)
if err := testutil.PopulateSuite(suite, v.Filename); err != nil {
t.Fatalf("failed populating suite: %s", err)
}
for _, group := range suite.TestGroups {
hash := subtle.ConvertHashName(group.SHA)
curve := subtle.ConvertCurveName(group.Key.Curve)
if hash == "" || curve == "" {
continue
}
x, err := subtle.NewBigIntFromHex(group.Key.Wx)
if err != nil {
t.Errorf("cannot decode wx: %s", err)
continue
}
y, err := subtle.NewBigIntFromHex(group.Key.Wy)
if err != nil {
t.Errorf("cannot decode wy: %s", err)
continue
}
verifier, err := subtleSignature.NewECDSAVerifier(hash, curve, v.Encoding, x.Bytes(), y.Bytes())
if err != nil {
continue
}
for _, test := range group.Tests {
caseName := fmt.Sprintf("%s-%s:Case-%d", group.Type, group.SHA, test.CaseID)
t.Run(caseName, func(t *testing.T) {
err := verifier.Verify(test.Signature, test.Message)
switch test.Result {
case "valid":
if err != nil {
t.Fatalf("ECDSAVerifier.Verify() failed in a valid test case: %s", err)
}
case "invalid":
if err == nil {
t.Fatalf("ECDSAVerifier.Verify() succeeded in an invalid test case")
}
case "acceptable":
// TODO: b/379282500 - Use acceptable test vectors.
default:
t.Fatalf("unsupported test result: %q", test.Result)
}
})
}
}
}
}
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