moved some functions out of server

extra_modules/SHA.js

@@ -0,0 +1,25 @@
+const crypto = require('crypto');
+
+/**
+ * hashes with the secure hashing algorithm 256
+ * @param       {string} str   string to hash
+ * @param       {any} salt  salt to apply to string
+ * @param       {number} num   amount of times to hash, defaults to 1
+ * @returns     {string}    base64 digested hash
+ */
+function SHA256(str,salt,num) {
+  if(!num && num!==0)num=1;
+  if(!str)return;
+  let ret = str;
+  for (let i = 0; i < num; i++) {
+    ret = crypto
+      .createHash("sha256")
+      .update(ret+salt)
+      .digest("base64");
+  }
+  return ret;
+}
+
+module.exports = {
+  SHA256: SHA256
+}