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// Copyright 2016 Google LLC. All Rights Reserved.
//
// 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 tls_test
import (
"crypto"
"encoding/pem"
mathrand "math/rand"
"reflect"
"strings"
"testing"
"time"
"github.com/google/certificate-transparency-go/testdata"
"github.com/google/certificate-transparency-go/tls"
"github.com/google/certificate-transparency-go/x509"
)
func TestVerifySignature(t *testing.T) {
var tests = []struct {
pubKey crypto.PublicKey
in string // hex encoded
hashAlgo tls.HashAlgorithm
sigAlgo tls.SignatureAlgorithm
errstr string
sig string // hex encoded
}{
{PEM2PK(testdata.RsaPublicKeyPEM), "61626364", 99, tls.ECDSA, "unsupported Algorithm.Hash", "1234"},
{PEM2PK(testdata.RsaPublicKeyPEM), "61626364", tls.SHA256, 99, "unsupported Algorithm.Signature", "1234"},
{PEM2PK(testdata.RsaPublicKeyPEM), "61626364", tls.SHA256, tls.DSA, "cannot verify DSA", "1234"},
{PEM2PK(testdata.RsaPublicKeyPEM), "61626364", tls.SHA256, tls.ECDSA, "cannot verify ECDSA", "1234"},
{PEM2PK(testdata.RsaPublicKeyPEM), "61626364", tls.SHA256, tls.RSA, "verification error", "1234"},
{PEM2PK(testdata.RsaPublicKeyPEM), "61626364", tls.SHA256, tls.ECDSA, "cannot verify ECDSA", "1234"},
{PEM2PK(testdata.DsaPublicKeyPEM), "61626364", tls.SHA1, tls.RSA, "cannot verify RSA", "1234"},
{PEM2PK(testdata.DsaPublicKeyPEM), "61626364", tls.SHA1, tls.ECDSA, "cannot verify ECDSA", "1234"},
{PEM2PK(testdata.DsaPublicKeyPEM), "61626364", tls.SHA1, tls.DSA, "failed to unmarshal DSA signature", "1234"},
{PEM2PK(testdata.DsaPublicKeyPEM), "61626364", tls.SHA1, tls.DSA, "failed to verify DSA signature", "3006020101020101eeff"},
{PEM2PK(testdata.DsaPublicKeyPEM), "61626364", tls.SHA1, tls.DSA, "zero or negative values", "3006020100020181"},
{PEM2PK(testdata.EcdsaPublicKeyPEM), "61626364", tls.SHA256, tls.RSA, "cannot verify RSA", "1234"},
{PEM2PK(testdata.EcdsaPublicKeyPEM), "61626364", tls.SHA256, tls.DSA, "cannot verify DSA", "1234"},
{PEM2PK(testdata.EcdsaPublicKeyPEM), "61626364", tls.SHA256, tls.ECDSA, "failed to unmarshal ECDSA signature", "1234"},
{PEM2PK(testdata.EcdsaPublicKeyPEM), "61626364", tls.SHA256, tls.ECDSA, "failed to verify ECDSA signature", "3006020101020101eeff"},
{PEM2PK(testdata.EcdsaPublicKeyPEM), "61626364", tls.SHA256, tls.ECDSA, "zero or negative values", "3006020100020181"},
{PEM2PK(testdata.RsaPublicKeyPEM), "61626364", tls.SHA256, tls.RSA, "", testdata.RsaSignedAbcdHex},
{PEM2PK(testdata.DsaPublicKeyPEM), "61626364", tls.SHA1, tls.DSA, "", testdata.DsaSignedAbcdHex},
{PEM2PK(testdata.EcdsaPublicKeyPEM), "61626364", tls.SHA256, tls.ECDSA, "", testdata.EcdsaSignedAbcdHex},
}
for _, test := range tests {
algo := tls.SignatureAndHashAlgorithm{Hash: test.hashAlgo, Signature: test.sigAlgo}
signed := tls.DigitallySigned{Algorithm: algo, Signature: testdata.FromHex(test.sig)}
err := tls.VerifySignature(test.pubKey, testdata.FromHex(test.in), signed)
if test.errstr != "" {
if err == nil {
t.Errorf("VerifySignature(%s)=nil; want %q", test.in, test.errstr)
} else if !strings.Contains(err.Error(), test.errstr) {
t.Errorf("VerifySignature(%s)=%q; want %q", test.in, err.Error(), test.errstr)
}
continue
}
if err != nil {
t.Errorf("VerifySignature(%s)=%q; want nil", test.in, err)
}
}
}
func TestCreateSignatureVerifySignatureRoundTrip(t *testing.T) {
var tests = []struct {
privKey crypto.PrivateKey
pubKey crypto.PublicKey
hashAlgo tls.HashAlgorithm
}{
{PEM2PrivKey(testdata.RsaPrivateKeyPEM), PEM2PK(testdata.RsaPublicKeyPEM), tls.SHA256},
{PEM2PrivKey(testdata.EcdsaPrivateKeyPKCS8PEM), PEM2PK(testdata.EcdsaPublicKeyPEM), tls.SHA256},
}
seed := time.Now().UnixNano()
r := mathrand.New(mathrand.NewSource(seed))
for _, test := range tests {
for j := 0; j < 1; j++ {
dataLen := 10 + r.Intn(100)
data := make([]byte, dataLen)
_, _ = r.Read(data)
sig, err := tls.CreateSignature(test.privKey, test.hashAlgo, data)
if err != nil {
t.Errorf("CreateSignature(%T, %v) failed with: %q", test.privKey, test.hashAlgo, err.Error())
continue
}
if err := tls.VerifySignature(test.pubKey, data, sig); err != nil {
t.Errorf("VerifySignature(%T, %v) failed with: %q", test.pubKey, test.hashAlgo, err)
}
}
}
}
func TestCreateSignatureFailures(t *testing.T) {
var tests = []struct {
privKey crypto.PrivateKey
hashAlgo tls.HashAlgorithm
in string // hex encoded
errstr string
}{
{PEM2PrivKey(testdata.EcdsaPrivateKeyPKCS8PEM), 99, "abcd", "unsupported Algorithm.Hash"},
{nil, tls.SHA256, "abcd", "unsupported private key type"},
}
for _, test := range tests {
if sig, err := tls.CreateSignature(test.privKey, test.hashAlgo, testdata.FromHex(test.in)); err == nil {
t.Errorf("CreateSignature(%T, %v)=%v,nil; want error %q", test.privKey, test.hashAlgo, sig, test.errstr)
} else if !strings.Contains(err.Error(), test.errstr) {
t.Errorf("CreateSignature(%T, %v)=nil,%q; want error %q", test.privKey, test.hashAlgo, err.Error(), test.errstr)
}
}
}
func PEM2PK(s string) crypto.PublicKey {
p, _ := pem.Decode([]byte(s))
if p == nil {
panic("no PEM block found in " + s)
}
pubKey, _ := x509.ParsePKIXPublicKey(p.Bytes)
if pubKey == nil {
panic("public key not parsed from " + s)
}
return pubKey
}
func PEM2PrivKey(s string) crypto.PrivateKey {
p, _ := pem.Decode([]byte(s))
if p == nil {
panic("no PEM block found in " + s)
}
// Try various different private key formats one after another.
if rsaPrivKey, err := x509.ParsePKCS1PrivateKey(p.Bytes); err == nil {
return *rsaPrivKey
}
if pkcs8Key, err := x509.ParsePKCS8PrivateKey(p.Bytes); err == nil {
if reflect.TypeOf(pkcs8Key).Kind() == reflect.Ptr {
pkcs8Key = reflect.ValueOf(pkcs8Key).Elem().Interface()
}
return pkcs8Key
}
return nil
}
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