harness-drone/common/sshutil/sshutil.go

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2014-06-04 21:25:38 +00:00
package sshutil
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"code.google.com/p/go.crypto/ssh"
)
const (
RSA_BITS = 2048 // Default number of bits in an RSA key
RSA_BITS_MIN = 768 // Minimum number of bits in an RSA key
)
// helper function to generate an RSA Private Key.
func GeneratePrivateKey() (*rsa.PrivateKey, error) {
return rsa.GenerateKey(rand.Reader, RSA_BITS)
}
// helper function that marshalls an RSA Public Key to an SSH
// .authorized_keys format
func MarshalPublicKey(pubkey *rsa.PublicKey) string {
pk, err := ssh.NewPublicKey(pubkey)
if err != nil {
return ""
}
return string(ssh.MarshalAuthorizedKey(pk))
}
// helper function that marshalls an RSA Private Key to
// a PEM encoded file.
func MarshalPrivateKey(privkey *rsa.PrivateKey) string {
privateKeyMarshaled := x509.MarshalPKCS1PrivateKey(privkey)
privateKeyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Headers: nil, Bytes: privateKeyMarshaled})
return string(privateKeyPEM)
}