69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
/*
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Copyright 2020 The cert-manager Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package pki
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import (
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"crypto/x509/pkix"
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"encoding/asn1"
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"errors"
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)
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// Copied from x509.go
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var (
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OIDExtensionBasicConstraints = []int{2, 5, 29, 19}
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)
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// Copied from x509.go
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type basicConstraints struct {
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IsCA bool `asn1:"optional"`
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MaxPathLen int `asn1:"optional,default:-1"`
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}
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// Adapted from x509.go
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func MarshalBasicConstraints(isCA bool, maxPathLen *int) (pkix.Extension, error) {
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ext := pkix.Extension{Id: OIDExtensionBasicConstraints, Critical: true}
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// A value of -1 causes encoding/asn1 to omit the value as desired.
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maxPathLenValue := -1
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if maxPathLen != nil {
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maxPathLenValue = *maxPathLen
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}
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var err error
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ext.Value, err = asn1.Marshal(basicConstraints{isCA, maxPathLenValue})
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return ext, err
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}
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// Adapted from x509.go
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func UnmarshalBasicConstraints(value []byte) (isCA bool, maxPathLen *int, err error) {
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var constraints basicConstraints
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var rest []byte
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if rest, err = asn1.Unmarshal(value, &constraints); err != nil {
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return isCA, maxPathLen, err
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} else if len(rest) != 0 {
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return isCA, maxPathLen, errors.New("x509: trailing data after X.509 BasicConstraints")
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}
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isCA = constraints.IsCA
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if constraints.MaxPathLen >= 0 {
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maxPathLen = new(int)
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*maxPathLen = constraints.MaxPathLen
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}
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return isCA, maxPathLen, nil
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}
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