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// Copyright The Notary Project 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 x509util provides the method to validate the certificate chain for a
// specific purpose, including code signing and timestamping. It also provides
// the method to find the extension by the given OID.
package x509util
import (
"crypto/x509"
"fmt"
"github.com/notaryproject/notation-core-go/revocation/purpose"
"github.com/notaryproject/notation-core-go/revocation/result"
coreX509 "github.com/notaryproject/notation-core-go/x509"
)
// ValidateChain checks the certificate chain for a specific purpose, including
// code signing and timestamping.
func ValidateChain(certChain []*x509.Certificate, certChainPurpose purpose.Purpose) error {
switch certChainPurpose {
case purpose.CodeSigning:
// Since ValidateCodeSigningCertChain is using authentic signing time,
// signing time may be zero.
// Thus, it is better to pass nil here than fail for a cert's NotBefore
// being after zero time
if err := coreX509.ValidateCodeSigningCertChain(certChain, nil); err != nil {
return result.InvalidChainError{Err: err}
}
case purpose.Timestamping:
if err := coreX509.ValidateTimestampingCertChain(certChain); err != nil {
return result.InvalidChainError{Err: err}
}
default:
return result.InvalidChainError{Err: fmt.Errorf("unsupported certificate chain purpose %v", certChainPurpose)}
}
return nil
}
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