ADD: new pwdgen algo, (thanks @jackfagner) who did a great job figuring it out. Read his blog.

ref.   https://github.com/jackfagner/NfcKey/blob/master/NfcKeyC.c

client/util.h

@@ -26,6 +26,9 @@
 #ifndef ROTR
 # define ROTR(x,n) (((uintmax_t)(x) >> (n)) | ((uintmax_t)(x) << ((sizeof(x) * 8) - (n))))
 #endif
+#ifndef ROTL
+# define ROTL(x,n) (((uintmax_t)(x) << (n)) | ((uintmax_t)(x) >> ((sizeof(x) * 8) - (n))))
+#endif
 
 #ifndef MIN
 # define MIN(a, b) (((a) < (b)) ? (a) : (b))