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package jwk
import (
"crypto"
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"github.com/pkg/errors"
"github.com/smallstep/cli/jose"
"github.com/urfave/cli"
)
func thumbprintCommand() cli.Command {
return cli.Command{
Name: "thumbprint",
Action: cli.ActionFunc(thumbprintAction),
Usage: "compute thumbprint for a JWK",
UsageText: `**step crypto jwk thumbprint**`,
Description: `**step crypto jwk thumbprint** reads a JWK from STDINT, derives the
corresponding JWK Thumbprint (RFC7638), and prints the base64-urlencoded
thumbprint to STDOUT.
For examples, see **step help crypto jwk**.`,
}
}
func thumbprintAction(ctx *cli.Context) error {
b, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return errors.Wrap(err, "error reading from STDIN")
}
jwk := new(jose.JSONWebKey)
// Attempt to decrypt if encrypted
if b, err = jose.Decrypt("Please enter the password to decrypt your private JWK", b); err != nil {
return err
}
// Unmarshal the plain (or decrypted JWK)
if err = json.Unmarshal(b, jwk); err != nil {
return errors.New("error reading JWK: unsupported format")
}
hash, err := jwk.Thumbprint(crypto.SHA256)
if err != nil {
return errors.Wrap(err, "error generating JWK thumbprint")
}
fmt.Println(base64.RawURLEncoding.EncodeToString(hash))
return nil
}
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