| // 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/google/tink/go/signature/subtle" |
| "github.com/google/tink/go/subtle/random" |
| "github.com/google/tink/go/subtle" |
| "github.com/google/tink/go/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, _ := ecdsa.GenerateKey(subtle.GetCurve(curve), rand.Reader) |
| // 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, _ := ecdsa.GenerateKey(subtle.GetCurve("NIST_P256"), rand.Reader) |
| 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) { |
| testutil.SkipTestIfTestSrcDirIsNotSet(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(ckl): Inspect flags to appropriately handle acceptable test cases. |
| default: |
| t.Fatalf("unsupported test result: %q", test.Result) |
| } |
| }) |
| } |
| } |
| } |
| } |