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package main
import (
"context"
"fmt"
"io"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jwe"
"github.com/lestrrat-go/jwx/v2/jwk"
"github.com/urfave/cli/v2"
)
func init() {
topLevelCommands = append(topLevelCommands, makeJweCmd())
}
func makeJweCmd() *cli.Command {
var cmd cli.Command
cmd.Name = "jwe"
cmd.Usage = "Work with JWE messages"
cmd.Subcommands = []*cli.Command{
makeJweEncryptCmd(),
makeJweDecryptCmd(),
}
return &cmd
}
func keyEncryptionFlag(required bool) cli.Flag {
return &cli.StringFlag{
Name: "key-encryption",
Aliases: []string{"K"},
Usage: "Key encryption algorithm name `NAME` (e.g. RSA-OAEP, ECDH-ES, A128GCMKW, etc)",
Required: required,
}
}
func makeJweEncryptCmd() *cli.Command {
var cmd cli.Command
cmd.Name = "encrypt"
cmd.Usage = "Encrypt payload to generate JWE message"
cmd.UsageText = `jwx jwe encrypt [command options] FILE
Encrypt contents of FILE and generate a JWE message using
the specified algorithms and key.
Use "-" as FILE to read from STDIN.
`
cmd.Aliases = []string{"enc"}
cmd.Flags = []cli.Flag{
keyFlag("encrypt"),
keyFormatFlag(),
keyEncryptionFlag(true),
&cli.StringFlag{
Name: "content-encryption",
Aliases: []string{"C"},
Usage: "Content encryption algorithm name `NAME` (e.g. A128CBC-HS256, A192GCM, A256GCM, etc)",
Required: true,
},
&cli.BoolFlag{
Name: "compress",
Aliases: []string{"z"},
Usage: "Enable compression",
},
outputFlag(),
}
cmd.Action = func(c *cli.Context) error {
src, err := getSource(c.Args().Get(0))
if err != nil {
return err
}
defer src.Close()
buf, err := io.ReadAll(src)
if err != nil {
return fmt.Errorf(`failed to read data from source: %w`, err)
}
var keyenc jwa.KeyEncryptionAlgorithm
if err := keyenc.Accept(c.String("key-encryption")); err != nil {
return fmt.Errorf(`invalid key encryption algorithm: %w`, err)
}
var cntenc jwa.ContentEncryptionAlgorithm
if err := cntenc.Accept(c.String("content-encryption")); err != nil {
return fmt.Errorf(`invalid content encryption algorithm: %w`, err)
}
compress := jwa.NoCompress
if c.Bool("compress") {
compress = jwa.Deflate
}
keyset, err := getKeyFile(c.String("key"), c.String("key-format"))
if err != nil {
return err
}
if keyset.Len() != 1 {
return fmt.Errorf(`jwk file must contain exactly one key`)
}
key, _ := keyset.Key(0)
pubkey, err := jwk.PublicKeyOf(key)
if err != nil {
return fmt.Errorf(`failed to retrieve public key of %T: %w`, key, err)
}
encrypted, err := jwe.Encrypt(buf, jwe.WithKey(keyenc, pubkey), jwe.WithContentEncryption(cntenc), jwe.WithCompress(compress))
if err != nil {
return fmt.Errorf(`failed to encrypt message: %w`, err)
}
output, err := getOutput(c.String("output"))
if err != nil {
return err
}
defer output.Close()
fmt.Fprintf(output, "%s", encrypted)
return nil
}
return &cmd
}
func makeJweDecryptCmd() *cli.Command {
var cmd cli.Command
cmd.Name = "decrypt"
cmd.Aliases = []string{"dec"}
cmd.Flags = []cli.Flag{
keyFlag("decrypt"),
keyFormatFlag(),
keyEncryptionFlag(false),
outputFlag(),
}
cmd.Action = func(c *cli.Context) error {
src, err := getSource(c.Args().Get(0))
if err != nil {
return err
}
defer src.Close()
buf, err := io.ReadAll(src)
if err != nil {
return fmt.Errorf(`failed to read data from source: %w`, err)
}
keyset, err := getKeyFile(c.String("key"), c.String("key-format"))
if err != nil {
return err
}
if keyset.Len() != 1 {
return fmt.Errorf(`jwk file must contain exactly one key`)
}
key, _ := keyset.Key(0)
var decrypted []byte
if keyencalg := c.String("key-encryption"); keyencalg != "" {
var keyenc jwa.KeyEncryptionAlgorithm
if err := keyenc.Accept(c.String("key-encryption")); err != nil {
return fmt.Errorf(`invalid key encryption algorithm: %w`, err)
}
// if we have an explicit key encryption algorithm, we don't have to
// guess it.
v, err := jwe.Decrypt(buf, jwe.WithKey(keyenc, key))
if err != nil {
return fmt.Errorf(`failed to decrypt message: %w`, err)
}
decrypted = v
} else {
v, err := jwe.Decrypt(buf, jwe.WithKeyProvider(jwe.KeyProviderFunc(func(_ context.Context, sink jwe.KeySink, r jwe.Recipient, _ *jwe.Message) error {
sink.Key(r.Headers().Algorithm(), key)
return nil
})))
if err != nil {
return fmt.Errorf(`failed to decrypt message: %w`, err)
}
decrypted = v
}
output, err := getOutput(c.String("output"))
if err != nil {
return err
}
defer output.Close()
fmt.Fprintf(output, "%s", decrypted)
return nil
}
return &cmd
}
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