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crypter.go
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crypter.go
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// Copyright 2017 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
// Command crypter encrypts and decrypts a file.
package main
import (
"encoding/base64"
"fmt"
"io/ioutil"
"log"
"os"
"golang.org/x/net/context"
"golang.org/x/oauth2/google"
cloudkms "google.golang.org/api/cloudkms/v1"
)
func main() {
if len(os.Args) < 8 {
log.Fatal("usage: go run crypter.go {encrypt,decrypt} PROJECT LOCATION KEYRING CRYPTOKEY INFILE OUTFILE")
}
var (
command = os.Args[1]
projectID = os.Args[2]
locationID = os.Args[3]
keyRingID = os.Args[4]
cryptoKeyID = os.Args[5]
inPath = os.Args[6]
outPath = os.Args[7]
)
input, err := ioutil.ReadFile(inPath)
if err != nil {
log.Fatalf("Error reading file %q: %v", inPath, err)
}
var output []byte
switch command {
case "encrypt":
output, err = encrypt(projectID, locationID, keyRingID, cryptoKeyID, input)
if err != nil {
log.Fatalf("Error while encrypting: %v", err)
}
case "decrypt":
output, err = decrypt(projectID, locationID, keyRingID, cryptoKeyID, input)
if err != nil {
log.Fatalf("Error while decrypting: %v", err)
}
default:
log.Fatalf("Invalid command: %s. Must be 'encrypt' or 'decrypt'.", command)
}
if err := ioutil.WriteFile(outPath, output, 0600); err != nil {
log.Fatalf("Error writing to file %q: %v", outPath, err)
}
}
func encrypt(projectID, locationID, keyRingID, cryptoKeyID string, plaintext []byte) ([]byte, error) {
ctx := context.Background()
client, err := google.DefaultClient(ctx, cloudkms.CloudPlatformScope)
if err != nil {
return nil, err
}
cloudkmsService, err := cloudkms.New(client)
if err != nil {
return nil, err
}
parentName := fmt.Sprintf("projects/%s/locations/%s/keyRings/%s/cryptoKeys/%s",
projectID, locationID, keyRingID, cryptoKeyID)
req := &cloudkms.EncryptRequest{
Plaintext: base64.StdEncoding.EncodeToString(plaintext),
}
resp, err := cloudkmsService.Projects.Locations.KeyRings.CryptoKeys.Encrypt(parentName, req).Do()
if err != nil {
return nil, err
}
return base64.StdEncoding.DecodeString(resp.Ciphertext)
}
func decrypt(projectID, locationID, keyRingID, cryptoKeyID string, ciphertext []byte) ([]byte, error) {
ctx := context.Background()
client, err := google.DefaultClient(ctx, cloudkms.CloudPlatformScope)
if err != nil {
return nil, err
}
cloudkmsService, err := cloudkms.New(client)
if err != nil {
return nil, err
}
parentName := fmt.Sprintf("projects/%s/locations/%s/keyRings/%s/cryptoKeys/%s",
projectID, locationID, keyRingID, cryptoKeyID)
req := &cloudkms.DecryptRequest{
Ciphertext: base64.StdEncoding.EncodeToString(ciphertext),
}
resp, err := cloudkmsService.Projects.Locations.KeyRings.CryptoKeys.Decrypt(parentName, req).Do()
if err != nil {
return nil, err
}
return base64.StdEncoding.DecodeString(resp.Plaintext)
}