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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 (
"fmt"
"github.com/tink-crypto/tink-go/v2/tink"
)
// macWithKID implements the JWTMAC internal interface.
type macWithKID struct {
tm tink.MAC
algorithm string
customKID *string
}
// newMACWithKID creates a new JWTMACwithKID instance.
func newMACWithKID(tm tink.MAC, algorithm string, customKID *string) (*macWithKID, error) {
if tm == nil {
return nil, fmt.Errorf("invalid mac")
}
return &macWithKID{
tm: tm,
algorithm: algorithm,
customKID: customKID,
}, nil
}
// ComputeMACAndEncodeWithKID computes a MAC over a jwt token and encodes it using compact serialization.
func (jm *macWithKID) ComputeMACAndEncodeWithKID(token *RawJWT, kid *string) (string, error) {
unsigned, err := createUnsigned(token, jm.algorithm, kid, jm.customKID)
if err != nil {
return "", err
}
tag, err := jm.tm.ComputeMAC([]byte(unsigned))
if err != nil {
return "", err
}
return combineUnsignedAndSignature(unsigned, tag), nil
}
// VerifyMACAndDecodeWithKID verifies a MAC in a compact serialized JWT and returns a VerifiedJWT or an error.
func (jm *macWithKID) VerifyMACAndDecodeWithKID(compact string, verifier *Validator, kid *string) (*VerifiedJWT, error) {
tag, content, err := splitSignedCompact(compact)
if err != nil {
return nil, errJwtVerification
}
if err := jm.tm.VerifyMAC(tag, []byte(content)); err != nil {
return nil, errJwtVerification
}
rawJWT, err := decodeUnsignedTokenAndValidateHeader(content, jm.algorithm, kid, jm.customKID)
if err != nil {
return nil, errJwtVerification
}
if err := verifier.Validate(rawJWT); err != nil {
return nil, err
}
return newVerifiedJWT(rawJWT)
}
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