encrypt func added

main.go

@@ -1,20 +1,46 @@
 package main
 
 import (
+  "crypto/aes"
+  "crypto/cipher"
   "crypto/md5"
+  "crypto/rand"
   "fmt"
+  "io"
 )
 
-func hashMkr(passwd string) []byte {
-  h := md5.New()
-  h.Write([]byte(passwd))
-  return h.Sum(nil)
+func checkErr(err error) {
+  if err != nil {
+    panic(err.Error())
+  }
+}
+
+func keyMkr(passwd string) []byte {
+  key := md5.New()
+  key.Write([]byte(passwd))
+  return key.Sum(nil)
+}
+
+func encrypt(data []byte, key []byte) []byte {
+  block, err := aes.NewCipher(key)
+  checkErr(err)
+  gcm, err := cipher.NewGCM(block)
+  checkErr(err)
+  nonce := make([]byte, gcm.NonceSize())
+  _ , err= io.ReadFull(rand.Reader, nonce)
+  checkErr(err)
+  sealed := gcm.Seal(nonce, nonce, data, nil)
+  return sealed
 }
 
 func main() {
   var passwd string = "ThisAPassphrase"
   fmt.Println(passwd)
-  hash := hashMkr(passwd)
-  fmt.Println(hash)
+  key := keyMkr(passwd)
+  fmt.Println(key)
+  data := []byte("Thi is some data")
+  dataSealed := encrypt(data,key)
+  fmt.Println(string(data))
+  fmt.Println(string(dataSealed))
 }