initial commit

enc.php

@@ -0,0 +1,17 @@
+<?php
+function encrypt($plaintext, $key){
+  $cipher = "aes-128-gcm";
+  if (in_array($cipher, openssl_get_cipher_methods())){
+    $ivlen = openssl_cipher_iv_length($cipher);
+    $iv = openssl_random_pseudo_bytes($ivlen);
+    $res = openssl_encrypt($plaintext, $cipher, $key, $options=0, $iv, $tag);
+    return array($res, $iv, $tag);
+  } 
+}
+function decrypt($ciphertext, $key, $iv, $tag){
+  $cipher = "aes-128-gcm";
+  if (in_array($cipher, openssl_get_cipher_methods())){
+    return openssl_decrypt($ciphertext, $cipher, $key, $options=0, $iv, $tag);
+  }
+}
+?>