use ssh.ParsePrivateKey where we can

builder/vmware/iso/driver_esx5.go

@@ -15,7 +15,6 @@ import (
 	"time"
 
 	vmwcommon "github.com/hashicorp/packer/builder/vmware/common"
-	commonssh "github.com/hashicorp/packer/common/ssh"
 	"github.com/hashicorp/packer/communicator/ssh"
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
@@ -515,7 +514,7 @@ func (d *ESX5Driver) connect() error {
 	}
 
 	if d.PrivateKey != "" {
-		signer, err := commonssh.FileSigner(d.PrivateKey)
+		signer, err := gossh.ParsePrivateKey([]byte(d.PrivateKey))
 		if err != nil {
 			return err
 		}

helper/communicator/step_connect_ssh.go

@@ -225,7 +225,7 @@ func sshBastionConfig(config *Config) (*gossh.ClientConfig, error) {
 	}
 
 	if config.SSHBastionPrivateKey != "" {
-		signer, err := commonssh.FileSigner(config.SSHBastionPrivateKey)
+		signer, err := gossh.ParsePrivateKey([]byte(config.SSHBastionPrivateKey))
 		if err != nil {
 			return nil, err
 		}