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// Copyright 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package ssh
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"strings"
"github.com/juju/errors"
"golang.org/x/crypto/ssh"
)
// rsaGenerateKey allows for tests to patch out rsa key generation
var rsaGenerateKey = rsa.GenerateKey
// KeyBits is used to determine the number of bits to use for the RSA keys
// created using the GenerateKey function.
var KeyBits = 2048
// GenerateKey makes a 2048 bit RSA no-passphrase SSH capable key. The bit
// size is actually controlled by the KeyBits var. The private key returned is
// encoded to ASCII using the PKCS1 encoding. The public key is suitable to
// be added into an authorized_keys file, and has the comment passed in as the
// comment part of the key.
func GenerateKey(comment string) (private, public string, err error) {
key, err := rsaGenerateKey(rand.Reader, KeyBits)
if err != nil {
return "", "", errors.Trace(err)
}
identity := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
})
public, err = PublicKey(identity, comment)
if err != nil {
return "", "", errors.Trace(err)
}
return string(identity), public, nil
}
// PublicKey returns the public key for any private key. The public key is
// suitable to be added into an authorized_keys file, and has the comment
// passed in as the comment part of the key.
func PublicKey(privateKey []byte, comment string) (string, error) {
signer, err := ssh.ParsePrivateKey(privateKey)
if err != nil {
return "", errors.Annotate(err, "failed to load key")
}
auth_key := string(ssh.MarshalAuthorizedKey(signer.PublicKey()))
// Strip off the trailing new line so we can add a comment.
auth_key = strings.TrimSpace(auth_key)
public := fmt.Sprintf("%s %s\n", auth_key, comment)
return public, nil
}
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