You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.2 KiB
75 lines
2.2 KiB
/* |
|
Copyright 2016 The Kubernetes 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 cert |
|
|
|
import ( |
|
cryptorand "crypto/rand" |
|
"crypto/rsa" |
|
"crypto/x509" |
|
"crypto/x509/pkix" |
|
"encoding/pem" |
|
"net" |
|
) |
|
|
|
// MakeCSR generates a PEM-encoded CSR using the supplied private key, subject, and SANs. |
|
// All key types that are implemented via crypto.Signer are supported (This includes *rsa.PrivateKey and *ecdsa.PrivateKey.) |
|
func MakeCSR(privateKey interface{}, subject *pkix.Name, dnsSANs []string, ipSANs []net.IP) (csr []byte, err error) { |
|
template := &x509.CertificateRequest{ |
|
Subject: *subject, |
|
DNSNames: dnsSANs, |
|
IPAddresses: ipSANs, |
|
} |
|
|
|
return MakeCSRFromTemplate(privateKey, template) |
|
} |
|
|
|
// MakeCSRFromTemplate generates a PEM-encoded CSR using the supplied private |
|
// key and certificate request as a template. All key types that are |
|
// implemented via crypto.Signer are supported (This includes *rsa.PrivateKey |
|
// and *ecdsa.PrivateKey.) |
|
func MakeCSRFromTemplate(privateKey interface{}, template *x509.CertificateRequest) ([]byte, error) { |
|
t := *template |
|
t.SignatureAlgorithm = sigType(privateKey) |
|
|
|
csrDER, err := x509.CreateCertificateRequest(cryptorand.Reader, &t, privateKey) |
|
if err != nil { |
|
return nil, err |
|
} |
|
|
|
csrPemBlock := &pem.Block{ |
|
Type: CertificateRequestBlockType, |
|
Bytes: csrDER, |
|
} |
|
|
|
return pem.EncodeToMemory(csrPemBlock), nil |
|
} |
|
|
|
func sigType(privateKey interface{}) x509.SignatureAlgorithm { |
|
// Customize the signature for RSA keys, depending on the key size |
|
if privateKey, ok := privateKey.(*rsa.PrivateKey); ok { |
|
keySize := privateKey.N.BitLen() |
|
switch { |
|
case keySize >= 4096: |
|
return x509.SHA512WithRSA |
|
case keySize >= 3072: |
|
return x509.SHA384WithRSA |
|
default: |
|
return x509.SHA256WithRSA |
|
} |
|
} |
|
return x509.UnknownSignatureAlgorithm |
|
}
|
|
|