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package key
import (
"crypto"
"encoding/pem"
"os"
"github.com/pkg/errors"
"github.com/smallstep/cli/command"
"github.com/smallstep/cli/crypto/pemutil"
"github.com/smallstep/cli/errs"
"github.com/smallstep/cli/flags"
"github.com/smallstep/cli/ui"
"github.com/smallstep/cli/utils"
"github.com/urfave/cli"
)
func publicCommand() cli.Command {
return cli.Command{
Name: "public",
Action: command.ActionFunc(publicAction),
Usage: `print the public key from a private key`,
UsageText: `**step crypto key public** <key-file> [**--out**=<path>]`,
Description: `**step crypto key public** prints or writes in a PEM format
the public key corresponding to the given <key-file>.
## POSITIONAL ARGUMENTS
<key-file>
: Path to a private key.
## EXAMPLES
Print the corresponding public key:
'''
$ step crypto key public priv.pem
'''
Write the corresponding public key to a file:
'''
$ step crypto key public --out pub.pem key.pem
'''`,
Flags: []cli.Flag{
cli.StringFlag{
Name: "out",
Usage: "Path to write the public key.",
},
flags.Force,
},
}
}
func publicAction(ctx *cli.Context) error {
if err := errs.MinMaxNumberOfArguments(ctx, 0, 1); err != nil {
return err
}
var name string
switch ctx.NArg() {
case 0:
name = "-"
case 1:
name = ctx.Args().First()
default:
return errs.TooManyArguments(ctx)
}
b, err := utils.ReadFile(name)
if err != nil {
return err
}
priv, err := pemutil.Parse(b)
if err != nil {
return err
}
pub, ok := priv.(interface{ Public() crypto.PublicKey })
if !ok {
return errors.Errorf("cannot get a public key from %s", name)
}
if out := ctx.String("out"); out == "" {
block, err := pemutil.Serialize(pub.Public())
if err != nil {
return err
}
os.Stdout.Write(pem.EncodeToMemory(block))
} else {
_, err = pemutil.Serialize(pub.Public(), pemutil.ToFile(out, 0600))
if err != nil {
return err
}
ui.Printf("Your key has been saved in %s.\n", out)
}
return nil
}
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