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package common
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"io/ioutil"
)
func GeneratePrivateKey(bitSize int) (*rsa.PrivateKey, error) {
// Private Key generation
privateKey, err := rsa.GenerateKey(rand.Reader, bitSize)
if err != nil {
return nil, err
}
// Validate Private Key
err = privateKey.Validate()
if err != nil {
return nil, err
}
return privateKey, nil
}
func EncodePrivateKeyToPEM(privateKey *rsa.PrivateKey) []byte {
// Get ASN.1 DER format
privDER := x509.MarshalPKCS1PrivateKey(privateKey)
// pem.Block
privBlock := pem.Block{
Type: "RSA PRIVATE KEY",
Headers: nil,
Bytes: privDER,
}
// Private key in PEM format
privatePEM := pem.EncodeToMemory(&privBlock)
return privatePEM
}
func WriteKeyToFile(keyBytes []byte, saveFileTo string) error {
err := ioutil.WriteFile(saveFileTo, keyBytes, 0600)
if err != nil {
return err
}
return nil
}