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/
template.go
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/
template.go
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// Copyright 2017 Google Inc.
//
// 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 easypki
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"encoding/asn1"
"fmt"
"math/big"
"time"
)
func defaultTemplate(genReq *Request, publicKey crypto.PublicKey) error {
publicKeyBytes, err := asn1.Marshal(*publicKey.(*rsa.PublicKey))
if err != nil {
return fmt.Errorf("failed marshaling public key: %v", err)
}
subjectKeyID := sha1.Sum(publicKeyBytes)
genReq.Template.SubjectKeyId = subjectKeyID[:]
// Random serial number.
snLimit := new(big.Int).Lsh(big.NewInt(1), 128)
sn, err := rand.Int(rand.Reader, snLimit)
if err != nil {
return fmt.Errorf("failed generating serial number: %s", err)
}
genReq.Template.SerialNumber = sn
genReq.Template.NotBefore = time.Now()
genReq.Template.SignatureAlgorithm = x509.SHA256WithRSA
return nil
}
func caTemplate(genReq *Request, intermediateCA bool) error {
genReq.Template.KeyUsage = x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign | x509.KeyUsageCRLSign
genReq.Template.BasicConstraintsValid = true
genReq.Template.MaxPathLenZero = true
if intermediateCA {
return nil
}
// Root certificate can self-sign.
genReq.Template.Issuer = genReq.Template.Subject
genReq.Template.AuthorityKeyId = genReq.Template.SubjectKeyId
return nil
}
func nonCATemplate(genReq *Request) {
if !genReq.IsClientCertificate {
genReq.Template.ExtKeyUsage = append(genReq.Template.ExtKeyUsage, x509.ExtKeyUsageServerAuth)
}
// Clients can only use ClientAuth
genReq.Template.ExtKeyUsage = append(genReq.Template.ExtKeyUsage, x509.ExtKeyUsageClientAuth)
// set the usage for non-CA certificates
genReq.Template.KeyUsage = x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
}