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// Copyright 2025 The Sigstore Authors.
//
// 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 tink
import (
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rand"
"crypto/sha256"
"crypto/sha512"
"hash"
"testing"
"github.com/tink-crypto/tink-go/v2/keyset"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
"github.com/tink-crypto/tink-go/v2/signature"
)
func TestKeyHandleToSignerECDSA(t *testing.T) {
for _, tc := range []struct {
name string
keyTemplate *tinkpb.KeyTemplate
h hash.Hash
}{
{
name: "ECDSA-P256-SHA256",
keyTemplate: signature.ECDSAP256KeyWithoutPrefixTemplate(),
h: sha256.New(),
},
{
name: "ECDSA-P384-SHA512",
keyTemplate: signature.ECDSAP384KeyWithoutPrefixTemplate(),
h: sha512.New(),
},
{
name: "ECDSA-P521-SHA512",
keyTemplate: signature.ECDSAP521KeyWithoutPrefixTemplate(),
h: sha512.New(),
},
} {
t.Run(tc.name, func(t *testing.T) {
kh, err := keyset.NewHandle(tc.keyTemplate)
if err != nil {
t.Fatalf("error creating ECDSA key handle: %v", err)
}
// convert to crypto.Signer interface
signer, err := KeyHandleToSigner(kh)
if err != nil {
t.Fatalf("error converting ECDSA key handle to signer: %v", err)
}
msg := []byte("hello there")
// sign with key handle, verify with signer public key
tinkSigner, err := signature.NewSigner(kh)
if err != nil {
t.Fatalf("error creating tink signer: %v", err)
}
sig, err := tinkSigner.Sign(msg)
if err != nil {
t.Fatalf("error signing with tink signer: %v", err)
}
tc.h.Write(msg)
digest := tc.h.Sum(nil)
publicKey, ok := signer.Public().(*ecdsa.PublicKey)
if !ok {
t.Fatalf("error asserting ecdsa public key")
}
if !ecdsa.VerifyASN1(publicKey, digest, sig) {
t.Fatalf("signature from tink signer did not match")
}
// sign with signer, verify with key handle
privKey, ok := signer.(*ecdsa.PrivateKey)
if !ok {
t.Fatalf("error asserting ecdsa private key")
}
sig, err = ecdsa.SignASN1(rand.Reader, privKey, digest)
if err != nil {
t.Fatalf("error signing with crypto signer: %v", err)
}
pubkh, err := kh.Public()
if err != nil {
t.Fatalf("error fetching public key handle: %v", err)
}
v, err := signature.NewVerifier(pubkh)
if err != nil {
t.Fatalf("error creating tink verifier: %v", err)
}
if err := v.Verify(sig, msg); err != nil {
t.Fatalf("error verifying with tink verifier: %v", err)
}
})
}
}
func TestKeyHandleToSignerED25519(t *testing.T) {
kh, err := keyset.NewHandle(signature.ED25519KeyWithoutPrefixTemplate())
if err != nil {
t.Fatalf("error creating ED25519 key handle: %v", err)
}
// convert to crypto.Signer interface
signer, err := KeyHandleToSigner(kh)
if err != nil {
t.Fatalf("error converting ED25519 key handle to signer: %v", err)
}
msg := []byte("hello there")
// sign with key handle, verify with signer public key
tinkSigner, err := signature.NewSigner(kh)
if err != nil {
t.Fatalf("error creating tink signer: %v", err)
}
sig, err := tinkSigner.Sign(msg)
if err != nil {
t.Fatalf("error signing with tink signer: %v", err)
}
publicKey, ok := signer.Public().(ed25519.PublicKey)
if !ok {
t.Fatalf("error asserting ed25519 public key")
}
if !ed25519.Verify(publicKey, msg, sig) {
t.Fatalf("signature from tink signer did not match")
}
// sign with signer, verify with key handle
privKey, ok := signer.(ed25519.PrivateKey)
if !ok {
t.Fatalf("error asserting ed25519 private key")
}
sig = ed25519.Sign(privKey, msg)
if err != nil {
t.Fatalf("error signing with crypto signer: %v", err)
}
pubkh, err := kh.Public()
if err != nil {
t.Fatalf("error fetching public key handle: %v", err)
}
v, err := signature.NewVerifier(pubkh)
if err != nil {
t.Fatalf("error creating tink verifier: %v", err)
}
if err := v.Verify(sig, msg); err != nil {
t.Fatalf("error verifying with tink verifier: %v", err)
}
}
func TestKeyHandleToSignerFailsWithInvalidKeyType(t *testing.T) {
kh, err := keyset.NewHandle(signature.RSA_SSA_PKCS1_3072_SHA256_F4_RAW_Key_Template())
if err != nil {
t.Fatalf("keyset.NewHandle() err = %v, want nil", err)
}
if _, err := KeyHandleToSigner(kh); err == nil {
t.Errorf("KeyHandleToSigner(kh) err = nil, want error")
}
}
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