SSHSecure/sshkeys/rsa.go

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2020-09-18 18:01:16 -04:00
/*
SSHSecure - a program to harden OpenSSH from defaults
Copyright (C) 2020 Brent Saner
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package sshkeys
import (
"crypto/rand"
"crypto/rsa"
)
func (k *SSHPrivKey) generateRsa() error {
if k.BitSize == 0 {
k.BitSize = defRSABitSize
}
if k.Key != nil || k.PublicKey.Key != nil {
return nil // A no-op; key already exists.
}
if sk, err := rsa.GenerateKey(rand.Reader, int(k.BitSize)); err != nil {
return err
} else {
k.Key = sk // See https://golang.org/pkg/crypto/rsa/#PrivateKey
k.PublicKey.KeyType = KeyRsa
k.PublicKey.Key = k.Key.PublicKey
}
return nil
}