impl entities except for PATCH

.view/.aes/main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/base64"
+	"errors"
+	"log"
+	"os"
+	"strings"
+)
+
+func main() {
+	key := os.Args[1]
+	value := os.Args[2]
+	log.Println(aesDec(key, value))
+}
+
+func aesDec(key, payload string) (string, error) {
+	if len(key) == 0 {
+		return "", errors.New("key required")
+	}
+	key = strings.Repeat(key, 32)[:32]
+
+	ciphertext, err := base64.StdEncoding.DecodeString(payload)
+	if err != nil {
+		return "", err
+	}
+
+	block, err := aes.NewCipher([]byte(key))
+	if err != nil {
+		return "", err
+	}
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+	log.Println(gcm.NonceSize())
+	if len(ciphertext) < gcm.NonceSize() {
+		return "", errors.New("short ciphertext")
+	}
+	b, err := gcm.Open(nil, ciphertext[:gcm.NonceSize()], ciphertext[gcm.NonceSize():], nil)
+	return string(b), err
+}