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// Copyright 2022 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 jwt
import (
"errors"
"fmt"
"google.golang.org/protobuf/proto"
"github.com/tink-crypto/tink-go/v2/core/registry"
"github.com/tink-crypto/tink-go/v2/keyset"
"github.com/tink-crypto/tink-go/v2/signature/subtle"
jepb "github.com/tink-crypto/tink-go/v2/proto/jwt_ecdsa_go_proto"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
const (
jwtECDSAVerifierKeyVersion = 0
jwtECDSAVerifierTypeURL = "type.googleapis.com/google.crypto.tink.JwtEcdsaPublicKey"
jwtECDSAEncoding = "IEEE_P1363"
)
var (
errECDSAInvalidAlgorithm = errors.New("invalid algorithm")
errECDSAVerifierNotImplemented = errors.New("not supported on verifier key manager")
)
// jwtECDSAVerifierKeyManager implements the KeyManager interface
// for JWT Verifier using the 'ES256', 'ES384', and 'ES512' JWA algorithm.
type jwtECDSAVerifierKeyManager struct{}
var _ registry.KeyManager = (*jwtECDSAVerifierKeyManager)(nil)
type ecdsaParams struct {
Curve string
Hash string
}
var esAlgToParams = map[jepb.JwtEcdsaAlgorithm]ecdsaParams{
jepb.JwtEcdsaAlgorithm_ES256: {Curve: "NIST_P256", Hash: "SHA256"},
jepb.JwtEcdsaAlgorithm_ES384: {Curve: "NIST_P384", Hash: "SHA384"},
jepb.JwtEcdsaAlgorithm_ES512: {Curve: "NIST_P521", Hash: "SHA512"},
}
func (km *jwtECDSAVerifierKeyManager) Primitive(serializedKey []byte) (any, error) {
if serializedKey == nil || len(serializedKey) == 0 {
return nil, fmt.Errorf("invalid key")
}
pubKey := &jepb.JwtEcdsaPublicKey{}
if err := proto.Unmarshal(serializedKey, pubKey); err != nil {
return nil, err
}
if err := keyset.ValidateKeyVersion(pubKey.Version, jwtECDSAVerifierKeyVersion); err != nil {
return nil, fmt.Errorf("invalid key: %v", err)
}
params, ok := esAlgToParams[pubKey.GetAlgorithm()]
if !ok {
return nil, errECDSAInvalidAlgorithm
}
tv, err := subtle.NewECDSAVerifier(params.Hash, params.Curve, jwtECDSAEncoding, pubKey.GetX(), pubKey.GetY())
if err != nil {
return nil, err
}
return newVerifierWithKID(tv, pubKey.GetAlgorithm().String(), ecdsaCustomKID(pubKey))
}
func (km *jwtECDSAVerifierKeyManager) NewKey(serializedKeyFormat []byte) (proto.Message, error) {
return nil, errECDSAVerifierNotImplemented
}
func (km *jwtECDSAVerifierKeyManager) NewKeyData(serializedKeyFormat []byte) (*tinkpb.KeyData, error) {
return nil, errECDSAVerifierNotImplemented
}
func (km *jwtECDSAVerifierKeyManager) DoesSupport(typeURL string) bool {
return typeURL == jwtECDSAVerifierTypeURL
}
func (km *jwtECDSAVerifierKeyManager) TypeURL() string {
return jwtECDSAVerifierTypeURL
}
func ecdsaCustomKID(pk *jepb.JwtEcdsaPublicKey) *string {
if pk.GetCustomKid() == nil {
return nil
}
k := pk.GetCustomKid().GetValue()
return &k
}
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