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csr.go
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csr.go
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// Copyright 2022 Northern.tech AS
//
// 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 crypto
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"flag"
)
func NewPrivateKey() (*ecdsa.PrivateKey, error) {
privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, err
}
return privateKey, nil
}
func PrivateKeyToPem(privateKey *ecdsa.PrivateKey) []byte {
x509Encoded, _ := x509.MarshalECPrivateKey(privateKey)
pemEncoded := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: x509Encoded})
return pemEncoded
}
func NewCertificateSigningRequest(commonName string, key *ecdsa.PrivateKey) ([]byte, error) {
subject := pkix.Name{
Country: []string{""},
Province: []string{""},
Locality: []string{""},
Organization: []string{""},
OrganizationalUnit: []string{""},
CommonName: commonName,
}
template := x509.CertificateRequest{Subject: subject, DNSNames: flag.Args()}
csr, err := x509.CreateCertificateRequest(rand.Reader, &template, key)
if err != nil {
return nil, err
}
csrPemBlock := &pem.Block{
Type: "CERTIFICATE REQUEST",
Bytes: csr,
}
return pem.EncodeToMemory(csrPemBlock), nil
}