-
Notifications
You must be signed in to change notification settings - Fork 6
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add implementation for encrypt and decrypt commands.
- Loading branch information
Showing
4 changed files
with
347 additions
and
47 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| // Copyright 2022 Smallstep Labs, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| package cmd | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto" | ||
| "crypto/rand" | ||
| "crypto/rsa" | ||
| "encoding/base64" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
|
|
||
| "github.com/smallstep/step-kms-plugin/internal/flagutil" | ||
| "github.com/spf13/cobra" | ||
| "go.step.sm/crypto/kms" | ||
| "go.step.sm/crypto/kms/apiv1" | ||
| ) | ||
|
|
||
| // decryptCmd represents the decrypt command | ||
| var decryptCmd = &cobra.Command{ | ||
| Use: "decrypt <uri>", | ||
| Short: "A brief description of your command", | ||
| Long: `A longer description that spans multiple lines and likely contains examples | ||
| and usage of using your command. For example: | ||
| Cobra is a CLI library for Go that empowers applications. | ||
| This application is a tool to generate the needed files | ||
| to quickly create a Cobra application.`, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| if l := len(args); l != 1 { | ||
| return showErrUsage(cmd) | ||
| } | ||
|
|
||
| flags := cmd.Flags() | ||
| kuri := flagutil.MustString(flags, "kms") | ||
| if kuri == "" { | ||
| kuri = args[0] | ||
| } | ||
|
|
||
| oaep := flagutil.MustBool(flags, "oaep") | ||
| format := flagutil.MustString(flags, "format") | ||
| in := flagutil.MustString(flags, "in") | ||
|
|
||
| // OAEP requires a hash algorithm. | ||
| // It uses SHA256 by default. | ||
| var hash crypto.Hash | ||
| var err error | ||
| if oaep { | ||
| alg := flagutil.MustString(flags, "alg") | ||
| if hash, err = getHashAlgorithm(alg); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| var src, data []byte | ||
| if in != "" { | ||
| if src, err = os.ReadFile(in); err != nil { | ||
| return fmt.Errorf("failed to read file %q: %w", in, err) | ||
| } | ||
| } else { | ||
| if src, err = io.ReadAll(os.Stdin); err != nil { | ||
| return fmt.Errorf("failed to read from STDIN: %w", err) | ||
| } | ||
| } | ||
|
|
||
| switch format { | ||
| case "hex": | ||
| size := hex.DecodedLen(len(src)) | ||
| data = make([]byte, size) | ||
| n, err := hex.Decode(data, src) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to decode input: %w", err) | ||
| } | ||
| data = data[:n] | ||
| case "raw": | ||
| data = src | ||
| default: | ||
| size := base64.StdEncoding.DecodedLen(len(src)) | ||
| data = make([]byte, size) | ||
| n, err := base64.StdEncoding.Decode(data, src) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to decode input: %w", err) | ||
| } | ||
| data = data[:n] | ||
| } | ||
|
|
||
| km, err := kms.New(context.Background(), apiv1.Options{ | ||
| URI: kuri, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to load key manager: %w", err) | ||
| } | ||
| defer km.Close() | ||
|
|
||
| dec, ok := km.(apiv1.Decrypter) | ||
| if !ok { | ||
| return fmt.Errorf("%s does not implement Decrypter", kuri) | ||
| } | ||
|
|
||
| d, err := dec.CreateDecrypter(&apiv1.CreateDecrypterRequest{ | ||
| DecryptionKey: kuri, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| var opts crypto.DecrypterOpts | ||
| if oaep { | ||
| opts = &rsa.OAEPOptions{ | ||
| Hash: hash, | ||
| Label: []byte(DefaultOEAPLabel), | ||
| } | ||
| } | ||
|
|
||
| b, err := d.Decrypt(rand.Reader, data, opts) | ||
| if err != nil { | ||
| return fmt.Errorf("error decrypting input: %w", err) | ||
| } | ||
| os.Stdout.Write(b) | ||
| return nil | ||
| }, | ||
| } | ||
|
|
||
| func init() { | ||
| rootCmd.AddCommand(decryptCmd) | ||
| decryptCmd.SilenceUsage = true | ||
|
|
||
| flags := decryptCmd.Flags() | ||
| flags.SortFlags = false | ||
|
|
||
| alg := flagutil.NormalizedValue("alg", []string{"SHA256", "SHA384", "SHA512"}, "SHA256") | ||
| format := flagutil.LowerValue("format", []string{"base64", "hex", "raw"}, "base64") | ||
|
|
||
| flags.Bool("oaep", false, "Use RSA-OAEP instead of RSA PKCS #1 v1.5") | ||
| flags.Var(alg, "alg", "The hashing `algorithm` to use on RSA-OAEP.\nOptions are SHA256, SHA384 or SHA512") | ||
| flags.Var(format, "format", "The `format` to print the signature.\nOptions are base64, hex, or raw") | ||
| flags.String("in", "", "The `file` to decrypt instead of using STDIN.") | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| // Copyright 2022 Smallstep Labs, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| package cmd | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto" | ||
| "crypto/rand" | ||
| "crypto/rsa" | ||
| "encoding/base64" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
|
|
||
| "github.com/smallstep/step-kms-plugin/internal/flagutil" | ||
| "github.com/spf13/cobra" | ||
| "go.step.sm/crypto/kms" | ||
| "go.step.sm/crypto/kms/apiv1" | ||
| ) | ||
|
|
||
| // DefaultOEAPLabel is the label used when OAEP is used. | ||
| const DefaultOEAPLabel = "step-kms-plugin/v1/oaep" | ||
|
|
||
| // encryptCmd represents the encrypt command | ||
| var encryptCmd = &cobra.Command{ | ||
| Use: "encrypt <uri>", | ||
| Short: "A brief description of your command", | ||
| Long: `A longer description that spans multiple lines and likely contains examples | ||
| and usage of using your command. For example: | ||
| Cobra is a CLI library for Go that empowers applications. | ||
| This application is a tool to generate the needed files | ||
| to quickly create a Cobra application.`, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| if l := len(args); l != 1 { | ||
| return showErrUsage(cmd) | ||
| } | ||
|
|
||
| flags := cmd.Flags() | ||
| kuri := flagutil.MustString(flags, "kms") | ||
| if kuri == "" { | ||
| kuri = args[0] | ||
| } | ||
|
|
||
| oaep := flagutil.MustBool(flags, "oaep") | ||
| format := flagutil.MustString(flags, "format") | ||
| in := flagutil.MustString(flags, "in") | ||
|
|
||
| // OAEP requires a hash algorithm. | ||
| // It uses SHA256 by default. | ||
| var hash crypto.Hash | ||
| var err error | ||
| if oaep { | ||
| alg := flagutil.MustString(flags, "alg") | ||
| if hash, err = getHashAlgorithm(alg); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| // Read input | ||
| var data []byte | ||
| if in != "" { | ||
| if data, err = os.ReadFile(in); err != nil { | ||
| return fmt.Errorf("failed to read file %q: %w", in, err) | ||
| } | ||
| } else { | ||
| if data, err = io.ReadAll(os.Stdin); err != nil { | ||
| return fmt.Errorf("failed to read from STDIN: %w", err) | ||
| } | ||
| } | ||
|
|
||
| km, err := kms.New(context.Background(), apiv1.Options{ | ||
| URI: kuri, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to load key manager: %w", err) | ||
| } | ||
| defer km.Close() | ||
|
|
||
| key, err := km.GetPublicKey(&apiv1.GetPublicKeyRequest{ | ||
| Name: kuri, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get the public key: %w", err) | ||
| } | ||
|
|
||
| pub, ok := key.(*rsa.PublicKey) | ||
| if !ok { | ||
| return fmt.Errorf("%s is not an RSA key", kuri) | ||
| } | ||
|
|
||
| var b []byte | ||
| if oaep { | ||
| if b, err = rsa.EncryptOAEP(hash.New(), rand.Reader, pub, data, []byte(DefaultOEAPLabel)); err != nil { | ||
| return err | ||
| } | ||
| } else { | ||
| if b, err = rsa.EncryptPKCS1v15(rand.Reader, pub, data); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| switch format { | ||
| case "hex": | ||
| fmt.Println(hex.EncodeToString(b)) | ||
| case "raw": | ||
| os.Stdout.Write(b) | ||
| default: | ||
| fmt.Println(base64.StdEncoding.EncodeToString(b)) | ||
| } | ||
|
|
||
| return nil | ||
| }, | ||
| } | ||
|
|
||
| func getHashAlgorithm(alg string) (crypto.Hash, error) { | ||
| switch alg { | ||
| case "", "SHA256": | ||
| return crypto.SHA256, nil | ||
| case "SHA384": | ||
| return crypto.SHA384, nil | ||
| case "SHA512": | ||
| return crypto.SHA512, nil | ||
| default: | ||
| return 0, fmt.Errorf("unsupported hashing algorithm %q", alg) | ||
| } | ||
| } | ||
|
|
||
| func init() { | ||
| rootCmd.AddCommand(encryptCmd) | ||
| encryptCmd.SilenceUsage = true | ||
|
|
||
| flags := encryptCmd.Flags() | ||
| flags.SortFlags = false | ||
|
|
||
| alg := flagutil.NormalizedValue("alg", []string{"SHA256", "SHA384", "SHA512"}, "SHA256") | ||
| format := flagutil.LowerValue("format", []string{"base64", "hex", "raw"}, "base64") | ||
|
|
||
| flags.Bool("oaep", false, "Use RSA-OAEP instead of RSA PKCS #1 v1.5") | ||
| flags.Var(alg, "alg", "The hashing `algorithm` to use on RSA-OAEP.\nOptions are SHA256, SHA384 or SHA512") | ||
| flags.Var(format, "format", "The `format` used in the input.\nOptions are base64, hex, or raw") | ||
| flags.String("in", "", "The `file` to encrypt instead of using STDIN.") | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.