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cert.go
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cert.go
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package cert
import (
"bytes"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"time"
)
type CertPemData struct {
Crt []byte // PEM encoded
Key []byte // PEM encoded
}
func NewCertificateFromDER(der [][]byte, privateKey *rsa.PrivateKey) (certificate *CertPemData, err error) {
if len(der) < 1 {
err = errors.New("can't create certificate from empty DER array")
return
}
certificate = &CertPemData{}
certBuffer := bytes.NewBuffer([]byte{})
for _, cert := range der {
_, err = x509.ParseCertificate(cert)
if err != nil {
return
}
pem.Encode(certBuffer, &pem.Block{Type: "CERTIFICATE", Bytes: cert})
}
certificate.Crt = certBuffer.Bytes()
keyPem := pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(privateKey),
})
certificate.Key = keyPem
return
}
func (c *CertPemData) Certificate() (*x509.Certificate, error) {
block, _ := pem.Decode(c.Crt)
if block == nil {
return nil, errors.New("no data found in Crt")
}
certificate, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, err
}
return certificate, nil
}
func IsValid(c *x509.Certificate, t time.Time) bool {
return !(t.Before(c.NotBefore) || t.After(c.NotAfter))
}