run 'go get -u; make revendor'

Signed-off-by: Stephan Renatus <srenatus@chef.io>

vendor/github.com/gtank/cryptopasta/encrypt.go

@@ -16,6 +16,7 @@ import (
 	"crypto/aes"
 	"crypto/cipher"
 	"crypto/rand"
+	"errors"
 	"io"
 )
 
@@ -67,6 +68,10 @@ func Decrypt(ciphertext []byte, key *[32]byte) (plaintext []byte, err error) {
 		return nil, err
 	}
 
+	if len(ciphertext) < gcm.NonceSize() {
+		return nil, errors.New("malformed ciphertext")
+	}
+
 	return gcm.Open(nil,
 		ciphertext[:gcm.NonceSize()],
 		ciphertext[gcm.NonceSize():],