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keys.go
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keys.go
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package ssh
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"errors"
"fmt"
"os"
gossh "golang.org/x/crypto/ssh"
)
var (
ErrKeyGeneration = errors.New("Unable to generate key")
ErrPrivateKey = errors.New("Unable to marshal private key")
ErrPublicKey = errors.New("Unable to convert public key")
ErrUnableToWriteFile = errors.New("Unable to write file")
)
type KeyPair struct {
PrivateKey []byte
PublicKey []byte
}
// NewKeyPair generates a new SSH keypair
// This will return a private & public key encoded as DER.
func NewKeyPair() (keyPair *KeyPair, err error) {
priv, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
return nil, ErrKeyGeneration
}
privDer, err := x509.MarshalPKCS8PrivateKey(priv)
if err != nil {
return nil, ErrPrivateKey
}
pubSSH, err := gossh.NewPublicKey(&priv.PublicKey)
if err != nil {
return nil, ErrPublicKey
}
return &KeyPair{
PrivateKey: privDer,
PublicKey: gossh.MarshalAuthorizedKey(pubSSH),
}, nil
}
// GenerateSSHKey generates SSH keypair based on path of the private key
// The public key would be generated to the same path with ".pub" added
func GenerateSSHKey(path string) error {
if _, err := os.Stat(path); err != nil {
if !os.IsNotExist(err) {
return fmt.Errorf("Desired directory for SSH keys does not exist: %s", err)
}
kp, err := NewKeyPair()
if err != nil {
return fmt.Errorf("Error generating key pair: %s", err)
}
if err := kp.WriteToFile(path, fmt.Sprintf("%s.pub", path)); err != nil {
return fmt.Errorf("Error writing keys to file(s): %s", err)
}
}
return nil
}