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generator.go
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generator.go
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/*
Copyright IBM Corp. 2017 All Rights Reserved.
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 ca
import (
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"os"
"time"
"path/filepath"
"github.com/hyperledger/fabric/common/tools/cryptogen/csp"
)
type CA struct {
Name string
//SignKey *ecdsa.PrivateKey
Signer crypto.Signer
SignCert *x509.Certificate
}
// NewCA creates an instance of CA and saves the signing key pair in
// baseDir/name
func NewCA(baseDir, org, name string) (*CA, error) {
var response error
var ca *CA
err := os.MkdirAll(baseDir, 0755)
if err == nil {
priv, signer, err := csp.GeneratePrivateKey(baseDir)
response = err
if err == nil {
// get public signing certificate
ecPubKey, err := csp.GetECPublicKey(priv)
response = err
if err == nil {
template := x509Template()
//this is a CA
template.IsCA = true
template.KeyUsage |= x509.KeyUsageCertSign | x509.KeyUsageCRLSign
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageAny, x509.ExtKeyUsageServerAuth}
//set the organization for the subject
subject := subjectTemplate()
subject.Organization = []string{org}
subject.CommonName = name
template.Subject = subject
template.SubjectKeyId = priv.SKI()
x509Cert, err := genCertificateECDSA(baseDir, name, &template, &template,
ecPubKey, signer)
response = err
if err == nil {
ca = &CA{
Name: name,
Signer: signer,
SignCert: x509Cert,
}
}
}
}
}
return ca, response
}
// SignCertificate creates a signed certificate based on a built-in template
// and saves it in baseDir/name
func (ca *CA) SignCertificate(baseDir, name string, sans []string, pub *ecdsa.PublicKey) (*x509.Certificate, error) {
template := x509Template()
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}
//set the organization for the subject
subject := subjectTemplate()
subject.CommonName = name
template.Subject = subject
template.DNSNames = sans
cert, err := genCertificateECDSA(baseDir, name, &template, ca.SignCert,
pub, ca.Signer)
if err != nil {
return nil, err
}
return cert, nil
}
// default template for X509 subject
func subjectTemplate() pkix.Name {
return pkix.Name{
Country: []string{"US"},
Locality: []string{"San Francisco"},
Province: []string{"California"},
}
}
// default template for X509 certificates
func x509Template() x509.Certificate {
//generate a serial number
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, _ := rand.Int(rand.Reader, serialNumberLimit)
now := time.Now()
//basic template to use
x509 := x509.Certificate{
SerialNumber: serialNumber,
NotBefore: now,
NotAfter: now.Add(3650 * 24 * time.Hour), //~ten years
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
BasicConstraintsValid: true,
}
return x509
}
// generate a signed X509 certficate using ECDSA
func genCertificateECDSA(baseDir, name string, template, parent *x509.Certificate, pub *ecdsa.PublicKey,
priv interface{}) (*x509.Certificate, error) {
//create the x509 public cert
certBytes, err := x509.CreateCertificate(rand.Reader, template, parent, pub, priv)
if err != nil {
return nil, err
}
//write cert out to file
fileName := filepath.Join(baseDir, name+"-cert.pem")
certFile, err := os.Create(fileName)
if err != nil {
return nil, err
}
//pem encode the cert
err = pem.Encode(certFile, &pem.Block{Type: "CERTIFICATE", Bytes: certBytes})
certFile.Close()
if err != nil {
return nil, err
}
x509Cert, err := x509.ParseCertificate(certBytes)
if err != nil {
return nil, err
}
return x509Cert, nil
}