diff --git a/plugins/emqttd_plugin_mysql/.placehodler b/plugins/emqttd_plugin_mysql/.placehodler
deleted file mode 100644
index e69de29bb..000000000
diff --git a/plugins/emqttd_plugin_mysql/Makefile b/plugins/emqttd_plugin_mysql/Makefile
deleted file mode 100755
index 086a1fa40..000000000
--- a/plugins/emqttd_plugin_mysql/Makefile
+++ /dev/null
@@ -1,32 +0,0 @@
-REBAR?=./rebar
-
-
-all: build
-
-
-clean:
-	$(REBAR) clean
-	rm -rf logs
-	rm -rf .eunit
-	rm -f test/*.beam
-
-
-distclean: clean
-	git clean -fxd
-
-build: depends
-	$(REBAR) compile
-
-
-eunit:
-	$(REBAR) eunit skip_deps=true
-
-
-check: build eunit
-
-
-%.beam: %.erl
-	erlc -o test/ $<
-
-
-.PHONY: all clean distclean depends build eunit check
diff --git a/plugins/emqttd_plugin_mysql/README.md b/plugins/emqttd_plugin_mysql/README.md
deleted file mode 100644
index 481a8f3e7..000000000
--- a/plugins/emqttd_plugin_mysql/README.md
+++ /dev/null
@@ -1,49 +0,0 @@
-##  Overview
-
-Authentication with user table of MySQL database.
-
-## etc/plugin.config
-
-```erlang
-[
- {emysql, [
-    {pool,      4},
-    {host,      "localhost"},
-    {port,      3306},
-    {username,  ""}, 
-    {password,  ""},
-    {database,  "mqtt"},
-    {encoding,  utf8}
- ]},
- {emqttd_auth_mysql, [
-    {user_table, mqtt_users},
-    %% plain password only
-    {password_hash, plain},
-    {field_mapper, [
-        {username, username},
-        {password, password}
-    ]}
- ]}
-].
-```
-
-## Users Table(Demo)
-
-Notice: This is a demo table. You could authenticate with any user tables.
-
-```
-CREATE TABLE `mqtt_users` (
-  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
-  `username` varchar(60) DEFAULT NULL,
-  `password` varchar(60) DEFAULT NULL,
-  `salt` varchar(20) DEFAULT NULL,
-  `created` datetime DEFAULT NULL,
-  PRIMARY KEY (`id`),
-  UNIQUE KEY `mqtt_users_username` (`username`)
-) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
-```
-
-## Load Plugin
-
-Merge the'etc/plugin.config' to emqttd/etc/plugins.config, and the plugin will be loaded by the  broker.
-
diff --git a/plugins/emqttd_plugin_mysql/c_src/base64.c b/plugins/emqttd_plugin_mysql/c_src/base64.c
deleted file mode 100755
index 457c1a138..000000000
--- a/plugins/emqttd_plugin_mysql/c_src/base64.c
+++ /dev/null
@@ -1,151 +0,0 @@
-/*
- * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Hgskolan
- * (Royal Institute of Technology, Stockholm, Sweden).
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *      This product includes software developed by the Kungliga Tekniska
- *      Hgskolan and its contributors.
- *
- * 4. Neither the name of the Institute nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-/*RCSID("$Id: base64.c,v 1.1 2005/02/11 07:34:35 jpm Exp jpm $");*/
-#endif
-#include <stdlib.h>
-#include <string.h>
-#include "base64.h"
-
-static char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-static int pos(char c)
-{
-  char *p;
-  for(p = base64; *p; p++)
-    if(*p == c)
-      return p - base64;
-  return -1;
-}
-
-int base64_encode(const void *data, int size, char **str)
-{
-  char *s, *p;
-  int i;
-  int c;
-  unsigned char *q;
-
-  p = s = (char*)malloc(size*4/3+4);
-  if (p == NULL)
-      return -1;
-  q = (unsigned char*)data;
-  i=0;
-  for(i = 0; i < size;){
-    c=q[i++];
-    c*=256;
-    if(i < size)
-      c+=q[i];
-    i++;
-    c*=256;
-    if(i < size)
-      c+=q[i];
-    i++;
-    p[0]=base64[(c&0x00fc0000) >> 18];
-    p[1]=base64[(c&0x0003f000) >> 12];
-    p[2]=base64[(c&0x00000fc0) >> 6];
-    p[3]=base64[(c&0x0000003f) >> 0];
-    if(i > size)
-      p[3]='=';
-    if(i > size+1)
-      p[2]='=';
-    p+=4;
-  }
-  *p=0;
-  *str = s;
-  return strlen(s);
-}
-
-int base64_decode(const char *str, void *data)
-{
-  const char *p;
-  unsigned char *q;
-  int c;
-  int x;
-  int done = 0;
-  q=(unsigned char*)data;
-  for(p=str; *p && !done; p+=4){
-    x = pos(p[0]);
-    if(x >= 0)
-      c = x;
-    else{
-      done = 3;
-      break;
-    }
-    c*=64;
-
-    x = pos(p[1]);
-    if(x >= 0)
-      c += x;
-    else
-      return -1;
-    c*=64;
-
-    if(p[2] == '=')
-      done++;
-    else{
-      x = pos(p[2]);
-      if(x >= 0)
-	c += x;
-      else
-	return -1;
-    }
-    c*=64;
-
-    if(p[3] == '=')
-      done++;
-    else{
-      if(done)
-	return -1;
-      x = pos(p[3]);
-      if(x >= 0)
-	c += x;
-      else
-	return -1;
-    }
-    if(done < 3)
-      *q++=(c&0x00ff0000)>>16;
-
-    if(done < 2)
-      *q++=(c&0x0000ff00)>>8;
-    if(done < 1)
-      *q++=(c&0x000000ff)>>0;
-  }
-  return q - (unsigned char*)data;
-}
diff --git a/plugins/emqttd_plugin_mysql/c_src/base64.h b/plugins/emqttd_plugin_mysql/c_src/base64.h
deleted file mode 100755
index 380a31d49..000000000
--- a/plugins/emqttd_plugin_mysql/c_src/base64.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Hgskolan
- * (Royal Institute of Technology, Stockholm, Sweden).
- * All rights reserved.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *      This product includes software developed by the Kungliga Tekniska
- *      Hgskolan and its contributors.
- * 
- * 4. Neither the name of the Institute nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-/* $Id: base64.h,v 1.1 2005/02/11 07:34:35 jpm Exp jpm $ */
-
-#ifndef _BASE64_H_
-#define _BASE64_H_
-
-int base64_encode(const void *data, int size, char **str);
-int base64_decode(const char *str, void *data);
-
-#endif
diff --git a/plugins/emqttd_plugin_mysql/c_src/emqttd_plugin_mysql_app.c b/plugins/emqttd_plugin_mysql/c_src/emqttd_plugin_mysql_app.c
deleted file mode 100755
index 374de99ac..000000000
--- a/plugins/emqttd_plugin_mysql/c_src/emqttd_plugin_mysql_app.c
+++ /dev/null
@@ -1,60 +0,0 @@
-// This file is part of Jiffy released under the MIT license.
-// See the LICENSE file for more information.
-
-#include "emqttd_plugin_mysql_app.h"
-
-static int
-load(ErlNifEnv* env, void** priv, ERL_NIF_TERM info)
-{
-    emqttd_plugin_mysql_app_st* st = enif_alloc(sizeof(emqttd_plugin_mysql_app_st));
-    if(st == NULL) {
-        return 1;
-    }
-
-    st->atom_ok = make_atom(env, "ok");
-    st->atom_error = make_atom(env, "error");
-    st->atom_null = make_atom(env, "null");
-    st->atom_true = make_atom(env, "true");
-    st->atom_false = make_atom(env, "false");
-    st->atom_bignum = make_atom(env, "bignum");
-    st->atom_bignum_e = make_atom(env, "bignum_e");
-    st->atom_bigdbl = make_atom(env, "bigdbl");
-    st->atom_partial = make_atom(env, "partial");
-    st->atom_uescape = make_atom(env, "uescape");
-    st->atom_pretty = make_atom(env, "pretty");
-    st->atom_force_utf8 = make_atom(env, "force_utf8");
-
-    // Markers used in encoding
-    st->ref_object = make_atom(env, "$object_ref$");
-    st->ref_array = make_atom(env, "$array_ref$");
-
-    *priv = (void*) st;
-
-    return 0;
-}
-
-static int
-reload(ErlNifEnv* env, void** priv, ERL_NIF_TERM info)
-{
-    return 0;
-}
-
-static int
-upgrade(ErlNifEnv* env, void** priv, void** old_priv, ERL_NIF_TERM info)
-{
-    return load(env, priv, info);
-}
-
-static void
-unload(ErlNifEnv* env, void* priv)
-{
-    enif_free(priv);
-    return;
-}
-
-static ErlNifFunc funcs[] =
-{
-    {"nif_pbkdf2_check", 2, pbkdf2_check}
-};
-
-ERL_NIF_INIT(emqttd_plugin_mysql_app, funcs, &load, &reload, &upgrade, &unload);
diff --git a/plugins/emqttd_plugin_mysql/c_src/emqttd_plugin_mysql_app.h b/plugins/emqttd_plugin_mysql/c_src/emqttd_plugin_mysql_app.h
deleted file mode 100755
index e77ae3b29..000000000
--- a/plugins/emqttd_plugin_mysql/c_src/emqttd_plugin_mysql_app.h
+++ /dev/null
@@ -1,44 +0,0 @@
-// This file is part of Jiffy released under the MIT license.
-// See the LICENSE file for more information.
-
-#ifndef EMQTTD_PLUGIN_MYSQL_APP_H
-#define EMQTTD_PLUGIN_MYSQL_APP_H
-
-#include "erl_nif.h"
-
-typedef struct {
-    ERL_NIF_TERM    atom_ok;
-    ERL_NIF_TERM    atom_error;
-    ERL_NIF_TERM    atom_null;
-    ERL_NIF_TERM    atom_true;
-    ERL_NIF_TERM    atom_false;
-    ERL_NIF_TERM    atom_bignum;
-    ERL_NIF_TERM    atom_bignum_e;
-    ERL_NIF_TERM    atom_bigdbl;
-    ERL_NIF_TERM    atom_partial;
-    ERL_NIF_TERM    atom_uescape;
-    ERL_NIF_TERM    atom_pretty;
-    ERL_NIF_TERM    atom_force_utf8;
-
-    ERL_NIF_TERM    ref_object;
-    ERL_NIF_TERM    ref_array;
-} emqttd_plugin_mysql_app_st;
-
-ERL_NIF_TERM make_atom(ErlNifEnv* env, const char* name);
-ERL_NIF_TERM make_ok(emqttd_plugin_mysql_app_st* st, ErlNifEnv* env, ERL_NIF_TERM data);
-ERL_NIF_TERM make_error(emqttd_plugin_mysql_app_st* st, ErlNifEnv* env, const char* error);
-
-ERL_NIF_TERM pbkdf2_check(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
-
-int int_from_hex(const unsigned char* p);
-int int_to_hex(int val, char* p);
-int utf8_len(int c);
-int utf8_esc_len(int c);
-int utf8_validate(unsigned char* data, size_t size);
-int utf8_to_unicode(unsigned char* buf, size_t size);
-int unicode_to_utf8(int c, unsigned char* buf);
-int unicode_from_pair(int hi, int lo);
-int unicode_uescape(int c, char* buf);
-int double_to_shortest(char *buf, size_t size, size_t* len, double val);
-
-#endif // Included EMQTTD_PLUGIN_MYSQL_APP_H
diff --git a/plugins/emqttd_plugin_mysql/c_src/pbkdf2_check.c b/plugins/emqttd_plugin_mysql/c_src/pbkdf2_check.c
deleted file mode 100644
index 0e40b933b..000000000
--- a/plugins/emqttd_plugin_mysql/c_src/pbkdf2_check.c
+++ /dev/null
@@ -1,278 +0,0 @@
-/*
- * Copyright (c) 2013 Jan-Piet Mens <jpmens()gmail.com>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of mosquitto nor the names of its
- *    contributors may be used to endorse or promote products derived from
- *    this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <openssl/evp.h>
-#include <openssl/rand.h>
-#include "base64.h"
-#include "erl_nif.h"
-#include "emqttd_plugin_mysql_app.h"
-
-#define KEY_LENGTH      24
-#define SEPARATOR       "$"
-#define SEPARATOR1       "_"
-#define TRUE	(1)
-#define FALSE	(0)
-
-/*
- * Split PBKDF2$... string into their components. The caller must free()
- * the strings.
- */
-
-static int detoken(char *pbkstr, char **sha, int *iter, char **salt, char **key)
-{
-    char *p, *s, *save;
-    int rc = 1;
-
-    save = s = strdup(pbkstr);
-
-    if ((p = strsep(&s, SEPARATOR1)) == NULL)
-        goto out;
-    if (strcmp(p, "pbkdf2") != 0)
-        goto out;
-
-    if ((p = strsep(&s, SEPARATOR)) == NULL)
-        goto out;
-    *sha = strdup(p);
-
-    if ((p = strsep(&s, SEPARATOR)) == NULL)
-        goto out;
-    *iter = atoi(p);
-
-    if ((p = strsep(&s, SEPARATOR)) == NULL)
-        goto out;
-    *salt = strdup(p);
-
-    if ((p = strsep(&s, SEPARATOR)) == NULL)
-        goto out;
-    *key = strdup(p);
-
-    rc = 0;
-
-out:
-    free(save);
-    return rc;
-}
-
-    ERL_NIF_TERM
-pbkdf2_check(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
-{
-    ERL_NIF_TERM ret;
-    ErlNifBinary binps, binhash;
-    emqttd_plugin_mysql_app_st* st = enif_alloc(sizeof(emqttd_plugin_mysql_app_st));
-    if(st == NULL) {
-        return make_atom(env, "alloc_error");
-    }
-
-    st->atom_ok = make_atom(env, "ok");
-    st->atom_error = make_atom(env, "error");
-    st->atom_null = make_atom(env, "null");
-    st->atom_true = make_atom(env, "true");
-    st->atom_false = make_atom(env, "false");
-    st->atom_bignum = make_atom(env, "bignum");
-    st->atom_bignum_e = make_atom(env, "bignum_e");
-    st->atom_bigdbl = make_atom(env, "bigdbl");
-    st->atom_partial = make_atom(env, "partial");
-    st->atom_uescape = make_atom(env, "uescape");
-    st->atom_pretty = make_atom(env, "pretty");
-    st->atom_force_utf8 = make_atom(env, "force_utf8");
-
-    // Markers used in encoding
-    st->ref_object = make_atom(env, "$object_ref$");
-    st->ref_array = make_atom(env, "$array_ref$");
-
-    if(argc != 2) {
-        return make_error(st, env, "Bad args");
-    } else if(!enif_inspect_binary(env, argv[0], &binps)|!enif_inspect_binary(env, argv[1], &binhash)) {
-        return make_error(st, env, "Bad args password or username inspect error");
-    }
-
-    char* password = (char*)binps.data;
-    char* hash = (char*)binhash.data;
-    static char *sha, *salt, *h_pw;
-    int iterations, saltlen, blen;
-    char *b64, *keybuf;
-    unsigned char *out;
-    int match = FALSE;
-    const EVP_MD *evpmd;
-    int keylen, rc;
-
-    if (detoken(hash, &sha, &iterations, &salt, &h_pw) != 0)
-        return match;
-
-    /* Determine key length by decoding base64 */
-    if ((keybuf = malloc(strlen(h_pw) + 1)) == NULL) {
-        return make_error(st, env, "internal_error: Out Of memory");
-    }
-    keylen = base64_decode(h_pw, keybuf);
-    if (keylen < 1) {
-        free(keybuf);
-        return make_atom(env, "false");
-    }
-    free(keybuf);
-
-    if ((out = malloc(keylen)) == NULL) {
-        return make_error(st, env, "Cannot allocate out; out of memory\n");
-    }
-
-#ifdef PWDEBUG
-    fprintf(stderr, "sha        =[%s]\n", sha);
-    fprintf(stderr, "iterations =%d\n", iterations);
-    fprintf(stderr, "salt       =[%s]\n", salt);
-    fprintf(stderr, "h_pw       =[%s]\n", h_pw);
-    fprintf(stderr, "kenlen     =[%d]\n", keylen);
-#endif
-
-    saltlen = strlen((char *)salt);
-
-    evpmd = EVP_sha256();
-    if (strcmp(sha, "sha1") == 0) {
-        evpmd = EVP_sha1();
-    } else if (strcmp(sha, "sha512") == 0) {
-        evpmd = EVP_sha512();
-    }
-
-    rc = PKCS5_PBKDF2_HMAC(password, strlen(password),
-            (unsigned char *)salt, saltlen,
-            iterations,
-            evpmd, keylen, out);
-    if (rc != 1) {
-        goto out;
-    }
-
-    blen = base64_encode(out, keylen, &b64);
-    if (blen > 0) {
-        int i, diff = 0, hlen = strlen(h_pw);
-#ifdef PWDEBUG
-        fprintf(stderr, "HMAC b64   =[%s]\n", b64);
-#endif
-
-        /* "manual" strcmp() to ensure constant time */
-        for (i = 0; (i < blen) && (i < hlen); i++) {
-            diff |= h_pw[i] ^ b64[i];
-        }
-
-        match = diff == 0;
-        if (hlen != blen)
-            match = 0;
-
-        free(b64);
-    }
-
-out:
-    free(sha);
-    free(salt);
-    free(h_pw);
-    free(out);
-
-    if(match == 0){
-        ret = make_atom(env, "false");
-    }else{
-        ret = make_atom(env, "true");
-    }
-    return ret;
-}
-
-int pbkdf2_check_native(char *password, char *hash)
-{
-    static char *sha, *salt, *h_pw;
-    int iterations, saltlen, blen;
-    char *b64;
-    unsigned char key[128];
-    int match = FALSE;
-    const EVP_MD *evpmd;
-
-    if (detoken(hash, &sha, &iterations, &salt, &h_pw) != 0)
-        return match;
-
-#ifdef PWDEBUG
-    fprintf(stderr, "sha        =[%s]\n", sha);
-    fprintf(stderr, "iterations =%d\n", iterations);
-    fprintf(stderr, "salt       =[%s]\n", salt);
-    fprintf(stderr, "h_pw       =[%s]\n", h_pw);
-#endif
-
-    saltlen = strlen((char *)salt);
-
-    evpmd = EVP_sha256();
-    if (strcmp(sha, "sha1") == 0) {
-        evpmd = EVP_sha1();
-    } else if (strcmp(sha, "sha512") == 0) {
-        evpmd = EVP_sha512();
-    }
-
-    PKCS5_PBKDF2_HMAC(password, strlen(password),
-            (unsigned char *)salt, saltlen,
-            iterations,
-            evpmd, KEY_LENGTH, key);
-
-    blen = base64_encode(key, KEY_LENGTH, &b64);
-    if (blen > 0) {
-        int i, diff = 0, hlen = strlen(h_pw);
-#ifdef PWDEBUG
-        fprintf(stderr, "HMAC b64   =[%s]\n", b64);
-#endif
-
-        /* "manual" strcmp() to ensure constant time */
-        for (i = 0; (i < blen) && (i < hlen); i++) {
-            diff |= h_pw[i] ^ b64[i];
-        }
-
-        match = diff == 0;
-        if (hlen != blen)
-            match = 0;
-
-        free(b64);
-    }
-
-    free(sha);
-    free(salt);
-    free(h_pw);
-
-    return match;
-}
-int main()
-{
-    // char password[] = "hello";
-    // char PB1[] = "PBKDF2$sha256$10000$eytf9sEo8EprP9P3$2eO6tROHiqI3bm+gg+vpmWooWMpz1zji";
-    char password[] = "supersecret";
-    //char PB1[] = "PBKDF2$sha256$10000$YEbSTt8FaMRDq/ib$Kt97+sMCYg00mqMOBAYinqZlnxX8HqHk";
-    char PB1[] = "pbkdf2_sha256$10000$YEbSTt8FaMRDq/ib$Kt97+sMCYg00mqMOBAYinqZlnxX8HqHk";
-    // char PB1[] = "PBKDF2$sha1$10000$XWfyPLeC9gsD6SbI$HOnjU4Ux7RpeBHdqYxpIGH1R5qCCtNA1";
-    // char PB1[] = "PBKDF2$sha512$10000$v/aaCgBZ+VZN5L8n$BpgjSTyb4weVxr9cA2mvQ+jaCyaAPeYe";
-    int match;
-
-    printf("Checking password [%s] for %s\n", password, PB1);
-
-    match = pbkdf2_check_native(password, PB1);
-    printf("match == %d\n", match);
-    return match;
-}
diff --git a/plugins/emqttd_plugin_mysql/c_src/util.c b/plugins/emqttd_plugin_mysql/c_src/util.c
deleted file mode 100755
index 8c0291b22..000000000
--- a/plugins/emqttd_plugin_mysql/c_src/util.c
+++ /dev/null
@@ -1,26 +0,0 @@
-// This file is part of Jiffy released under the MIT license.
-// See the LICENSE file for more information.
-
-#include "emqttd_plugin_mysql_app.h"
-
-ERL_NIF_TERM
-make_atom(ErlNifEnv* env, const char* name)
-{
-    ERL_NIF_TERM ret;
-    if(enif_make_existing_atom(env, name, &ret, ERL_NIF_LATIN1)) {
-        return ret;
-    }
-    return enif_make_atom(env, name);
-}
-
-ERL_NIF_TERM
-make_ok(emqttd_plugin_mysql_app_st* st, ErlNifEnv* env, ERL_NIF_TERM value)
-{
-    return enif_make_tuple2(env, st->atom_ok, value);
-}
-
-ERL_NIF_TERM
-make_error(emqttd_plugin_mysql_app_st* st, ErlNifEnv* env, const char* error)
-{
-    return enif_make_tuple2(env, st->atom_error, make_atom(env, error));
-}
diff --git a/plugins/emqttd_plugin_mysql/etc/plugin.config b/plugins/emqttd_plugin_mysql/etc/plugin.config
deleted file mode 100644
index 4b5044bde..000000000
--- a/plugins/emqttd_plugin_mysql/etc/plugin.config
+++ /dev/null
@@ -1,23 +0,0 @@
-[
-  {emysql, [
-    {pool, 4},
-    {host, "localhost"},
-    {port, 3306},
-    {username, "root"},
-    {password, "root"},
-    {database, "emqtt"},
-    {encoding, utf8}
-  ]},
-  {emqttd_plugin_mysql, [
-    {users_table, auth_user},
-    {acls_table, auth_acl},
-    {field_mapper, [
-      {username, username},
-      {password, password, pbkdf2},
-      {user_super, is_super_user},
-      {acl_username, username},
-      {acl_rw, rw},
-      {acl_topic, topic}
-    ]}
-  ]}
-].
diff --git a/plugins/emqttd_plugin_mysql/etc/plugins.config b/plugins/emqttd_plugin_mysql/etc/plugins.config
deleted file mode 100644
index 7b132dd3f..000000000
--- a/plugins/emqttd_plugin_mysql/etc/plugins.config
+++ /dev/null
@@ -1,23 +0,0 @@
-[
-  {emysql, [
-    {pool, 4},
-    {host, "59.188.253.198"},
-    {port, 3306},
-    {username, "root"},
-    {password, "lhroot."},
-    {database, "musicfield"},
-    {encoding, utf8}
-  ]},
-  {emqttd_plugin_mysql, [
-    {users_table, auth_user},
-    {acls_table, auth_acl},
-    {field_mapper, [
-      {username, username},
-      {password, password, pbkdf2},
-      {user_super, is_super_user},
-      {acl_username, username},
-      {acl_rw, rw},
-      {acl_topic, topic}
-    ]}
-  ]}
-].
diff --git a/plugins/emqttd_plugin_mysql/include/emqttd.hrl b/plugins/emqttd_plugin_mysql/include/emqttd.hrl
deleted file mode 100644
index 9c2ab934a..000000000
--- a/plugins/emqttd_plugin_mysql/include/emqttd.hrl
+++ /dev/null
@@ -1,112 +0,0 @@
-%%------------------------------------------------------------------------------
-%% Copyright (c) 2012-2015, Feng Lee <feng@emqtt.io>
-%% 
-%% Permission is hereby granted, free of charge, to any person obtaining a copy
-%% of this software and associated documentation files (the "Software"), to deal
-%% in the Software without restriction, including without limitation the rights
-%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-%% copies of the Software, and to permit persons to whom the Software is
-%% furnished to do so, subject to the following conditions:
-%% 
-%% The above copyright notice and this permission notice shall be included in all
-%% copies or substantial portions of the Software.
-%% 
-%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-%% SOFTWARE.
-%%------------------------------------------------------------------------------
-%%% @doc
-%%% MQTT Broker Header.
-%%%
-%%% @end
-%%%-----------------------------------------------------------------------------
-
-%%------------------------------------------------------------------------------
-%% Banner
-%%------------------------------------------------------------------------------
--define(COPYRIGHT, "Copyright (C) 2012-2015, Feng Lee <feng@emqtt.io>").
-
--define(LICENSE_MESSAGE, "Licensed under MIT"). 
-
--define(PROTOCOL_VERSION, "MQTT/3.1.1").
-
--define(ERTS_MINIMUM, "6.0").
-
-%%------------------------------------------------------------------------------
-%% PubSub
-%%------------------------------------------------------------------------------
--type pubsub() :: publish | subscribe.
-
-%%------------------------------------------------------------------------------
-%% MQTT Topic
-%%------------------------------------------------------------------------------
--record(mqtt_topic, {
-    topic   :: binary(),
-    node    :: node()
-}).
-
--type mqtt_topic() :: #mqtt_topic{}.
-
-%%------------------------------------------------------------------------------
-%% MQTT Subscriber
-%%------------------------------------------------------------------------------
--record(mqtt_subscriber, {
-    topic    :: binary(),
-    qos = 0  :: 0 | 1 | 2,
-    pid      :: pid()
-}).
-
--type mqtt_subscriber() :: #mqtt_subscriber{}.
-
-%%------------------------------------------------------------------------------
-%% P2P Queue Subscriber
-%%------------------------------------------------------------------------------
--record(mqtt_queue, {
-    name     :: binary(),
-    subpid   :: pid(),
-    qos = 0  :: 0 | 1 | 2
-}).
-
--type mqtt_queue() :: #mqtt_queue{}.
-
-%%------------------------------------------------------------------------------
-%% MQTT Client
-%%------------------------------------------------------------------------------
--record(mqtt_client, {
-    clientid    :: binary(),
-    username    :: binary() | undefined,
-    ipaddr      :: inet:ip_address()
-}).
-
--type mqtt_client() :: #mqtt_client{}.
-
-%%------------------------------------------------------------------------------
-%% MQTT Session
-%%------------------------------------------------------------------------------
--record(mqtt_session, {
-    clientid,
-    session_pid,
-    subscriptions = [],
-    awaiting_ack,
-    awaiting_rel
-}).
-
--type mqtt_session() :: #mqtt_session{}.
-
-%%------------------------------------------------------------------------------
-%% MQTT Plugin
-%%------------------------------------------------------------------------------
--record(mqtt_plugin, {
-    name,
-    version,
-    attrs,
-    description
-}).
-
--type mqtt_plugin() :: #mqtt_plugin{}.
-
-
diff --git a/plugins/emqttd_plugin_mysql/priv/.placeholder b/plugins/emqttd_plugin_mysql/priv/.placeholder
deleted file mode 100644
index e69de29bb..000000000
diff --git a/plugins/emqttd_plugin_mysql/rebar b/plugins/emqttd_plugin_mysql/rebar
deleted file mode 100755
index 36ef01107..000000000
Binary files a/plugins/emqttd_plugin_mysql/rebar and /dev/null differ
diff --git a/plugins/emqttd_plugin_mysql/rebar.config b/plugins/emqttd_plugin_mysql/rebar.config
deleted file mode 100755
index df10d9593..000000000
--- a/plugins/emqttd_plugin_mysql/rebar.config
+++ /dev/null
@@ -1,32 +0,0 @@
-{port_specs, [
-    {"priv/emqttd_plugin_mysql_app.so", [
-        "c_src/*.c"
-    ]}
-]}.
-
-{port_env, [
-    {".*", "CXXFLAGS", "$CXXFLAGS -g -Wall -Werror -O3"},
-
-    {"(linux|solaris|freebsd|netbsd|openbsd|dragonfly|darwin)",
-        "LDFLAGS", "$LDFLAGS -lstdc++ -lcrypto"},
-
-    %% OS X Leopard flags for 64-bit
-    {"darwin9.*-64$", "CXXFLAGS", "-m64"},
-    {"darwin9.*-64$", "LDFLAGS", "-arch x86_64"},
-
-    %% OS X Snow Leopard flags for 32-bit
-    {"darwin10.*-32$", "CXXFLAGS", "-m32"},
-    {"darwin10.*-32$", "LDFLAGS", "-arch i386"},
-
-    %% This will merge into basho/rebar/rebar.config eventually
-    {"win32", "CFLAGS", "/Wall /DWIN32 /D_WINDOWS /D_WIN32 /DWINDOWS"},
-    {"win32", "CXXFLAGS", "-g -Wall -O3"}
-]}.
-
-
-{eunit_opts, [
-    verbose,
-    {report, {
-        eunit_surefire, [{dir,"."}]
-    }}
-]}.
diff --git a/plugins/emqttd_plugin_mysql/src/emqttd_acl_mysql.erl b/plugins/emqttd_plugin_mysql/src/emqttd_acl_mysql.erl
deleted file mode 100644
index a2c995367..000000000
--- a/plugins/emqttd_plugin_mysql/src/emqttd_acl_mysql.erl
+++ /dev/null
@@ -1,70 +0,0 @@
-%%%-----------------------------------------------------------------------------
-%%% @Copyright (C) 2012-2015, Feng Lee <feng@emqtt.io>
-%%%
-%%% Permission is hereby granted, free of charge, to any person obtaining a copy
-%%% of this software and associated documentation files (the "Software"), to deal
-%%% in the Software without restriction, including without limitation the rights
-%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-%%% copies of the Software, and to permit persons to whom the Software is
-%%% furnished to do so, subject to the following conditions:
-%%%
-%%% The above copyright notice and this permission notice shall be included in all
-%%% copies or substantial portions of the Software.
-%%%
-%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-%%% SOFTWARE.
-%%%-----------------------------------------------------------------------------
-%%% @doc
-%%% emqttd demo acl module.
-%%%
-%%% @end
-%%%-----------------------------------------------------------------------------
--module(emqttd_acl_mysql).
-
--include("emqttd.hrl").
-
--behaviour(emqttd_acl_mod).
-
-%% ACL callbacks
--export([init/1, check_acl/2, reload_acl/1, description/0]).
--record(state, {user_table, acl_table, acl_username_field, acl_topic_field, acl_rw_field, user_name_field, user_super_field}).
-
-init(Opts) ->
-  Mapper = proplists:get_value(field_mapper, Opts),
-  State =
-    #state{
-      user_table = proplists:get_value(users_table, Opts, auth_user),
-      user_super_field = proplists:get_value(is_super, Mapper, is_superuser),
-      user_name_field = proplists:get_value(username, Mapper, username),
-      acl_table = proplists:get_value(acls_table, Opts, auth_acl),
-      acl_username_field = proplists:get_value(acl_username, Mapper, username),
-      acl_rw_field = proplists:get_value(acl_rw, Mapper, rw),
-      acl_topic_field = proplists:get_value(acl_topic, Mapper, topic)
-    },
-  {ok, State}.
-
-check_acl({#mqtt_client{username = Username}, PubSub, Topic}, #state{user_table = UserTab, acl_table = AclTab, user_name_field = UsernameField, user_super_field = SuperField, acl_topic_field = TopicField, acl_username_field = AclUserField, acl_rw_field = AclRwField}) ->
-  Flag = case PubSub of publish -> 2; subscribe -> 1; pubsub -> 2 end,
-  Where = {'and', {'>=', AclRwField, Flag}, {TopicField, Topic}},
-  Where1 = {'or', {AclUserField, Username}, {AclUserField, "*"}},
-  Where2 = {'and', Where, Where1},
-  case emysql:select(UserTab, {'and', {UsernameField, Username}, {SuperField, 1}}) of
-    {ok, []} ->
-      case emysql:select(UserTab, {UsernameField, Username}) of
-        {ok, []} -> ignore;
-        {ok, _} -> case emysql:select(AclTab, Where2) of
-                     {ok, []} -> deny;
-                     {ok, _Record} -> allow
-                   end
-      end;
-    {ok, _} -> allow
-  end.
-
-reload_acl(_State) -> ok.
-
-description() -> "ACL Module by Mysql".
diff --git a/plugins/emqttd_plugin_mysql/src/emqttd_auth_mysql.erl b/plugins/emqttd_plugin_mysql/src/emqttd_auth_mysql.erl
deleted file mode 100644
index a913dd587..000000000
--- a/plugins/emqttd_plugin_mysql/src/emqttd_auth_mysql.erl
+++ /dev/null
@@ -1,110 +0,0 @@
-%%%-----------------------------------------------------------------------------
-%%% Copyright (c) 2012-2015 eMQTT.IO, All Rights Reserved.
-%%%
-%%% Permission is hereby granted, free of charge, to any person obtaining a copy
-%%% of this software and associated documentation files (the "Software"), to deal
-%%% in the Software without restriction, including without limitation the rights
-%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-%%% copies of the Software, and to permit persons to whom the Software is
-%%% furnished to do so, subject to the following conditions:
-%%%
-%%% The above copyright notice and this permission notice shall be included in all
-%%% copies or substantial portions of the Software.
-%%%
-%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-%%% SOFTWARE.
-%%%-----------------------------------------------------------------------------
-%%% @doc
-%%% emqttd authentication by mysql 'user' table.
-%%%
-%%% @end
-%%%-----------------------------------------------------------------------------
--module(emqttd_auth_mysql).
-
--author("Feng Lee <feng@emqtt.io>").
-
--include("emqttd.hrl").
-
--behaviour(emqttd_auth_mod).
-
--export([init/1, check/3, description/0]).
-
--define(NOT_LOADED, not_loaded(?LINE)).
-
--record(state, {user_table, name_field, pass_field, pass_hash}).
-
-init(Opts) ->
-  Mapper = proplists:get_value(field_mapper, Opts),
-  {ok, #state{user_table = proplists:get_value(user_table, Opts, auth_user),
-    name_field = proplists:get_value(username, Mapper),
-    pass_field = proplists:get_value(password, Mapper),
-    pass_hash = proplists:get_value(Opts, password_hash)}}.
-
-check(#mqtt_client{username = undefined}, _Password, _State) ->
-  {error, "Username undefined"};
-check(_Client, undefined, _State) ->
-  {error, "Password undefined"};
-check(#mqtt_client{username = Username}, Password,
-    #state{user_table = UserTab, pass_hash = Type,
-      name_field = NameField, pass_field = PassField}) ->
-  Where = {'and', {NameField, Username}, {PassField, hash(Type, Password)}},
-  if Type =:= pbkdf2 ->
-    case emysql:select(UserTab, [PassField], {NameField, Username}) of
-      {ok, []} -> {error, "User not exist"};
-      {ok, Records} ->
-        if length(Records) =:= 1 ->
-          case pbkdf2_check(Password, lists:nth(Records, 1)) of
-            true ->
-              {ok, []};
-            false ->
-              {error, "UserName or Password is invalid"};
-            ErrorInfo ->
-              {error, ErrorInfo}
-          end;
-          true ->
-            {error, "UserName is ambiguous"}
-        end
-    end;
-    true ->
-      case emysql:select(UserTab, Where) of
-        {ok, []} -> {error, "Username or Password "};
-        {ok, _Record} -> ok
-      end
-  end.
-
-description() -> "Authentication by MySQL".
-
-hash(plain, Password) ->
-  Password;
-
-hash(md5, Password) ->
-  hexstring(crypto:hash(md5, Password));
-
-hash(sha, Password) ->
-  hexstring(crypto:hash(sha, Password)).
-
-hexstring(<<X:128/big-unsigned-integer>>) ->
-  lists:flatten(io_lib:format("~32.16.0b", [X]));
-
-hexstring(<<X:160/big-unsigned-integer>>) ->
-  lists:flatten(io_lib:format("~40.16.0b", [X])).
-
-not_loaded(Line) ->
-  erlang:nif_error({not_loaded, [{module, ?MODULE}, {line, Line}]}).
-
-pbkdf2_check(Password, Pbkstr) ->
-  case nif_pbkdf2_check(Password, Pbkstr) of
-    {error, _} = Error ->
-      throw(Error);
-    IOData ->
-      IOData
-  end.
-
-nif_pbkdf2_check(Password, Pbkstr) ->
-  ?NOT_LOADED.
-
diff --git a/plugins/emqttd_plugin_mysql/src/emqttd_plugin_mysql.app.src b/plugins/emqttd_plugin_mysql/src/emqttd_plugin_mysql.app.src
deleted file mode 100644
index 389bd33cb..000000000
--- a/plugins/emqttd_plugin_mysql/src/emqttd_plugin_mysql.app.src
+++ /dev/null
@@ -1,12 +0,0 @@
-{application, emqttd_plugin_mysql,
- [
-  {description, "emqttd MySQL Authentication Plugin"},
-  {vsn, "1.0"},
-  {registered, []},
-  {applications, [
-                  kernel,
-                  stdlib
-                 ]},
-  {mod, {emqttd_plugin_mysql_app, []}},
-  {env, []}
- ]}.
diff --git a/plugins/emqttd_plugin_mysql/src/emqttd_plugin_mysql_app.erl b/plugins/emqttd_plugin_mysql/src/emqttd_plugin_mysql_app.erl
deleted file mode 100644
index 712e75ea6..000000000
--- a/plugins/emqttd_plugin_mysql/src/emqttd_plugin_mysql_app.erl
+++ /dev/null
@@ -1,80 +0,0 @@
-%%%-----------------------------------------------------------------------------
-%%% Copyright (c) 2012-2015 eMQTT.IO, All Rights Reserved.
-%%%
-%%% Permission is hereby granted, free of charge, to any person obtaining a copy
-%%% of this software and associated documentation files (the "Software"), to deal
-%%% in the Software without restriction, including without limitation the rights
-%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-%%% copies of the Software, and to permit persons to whom the Software is
-%%% furnished to do so, subject to the following conditions:
-%%%
-%%% The above copyright notice and this permission notice shall be included in all
-%%% copies or substantial portions of the Software.
-%%%
-%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-%%% SOFTWARE.
-%%%-----------------------------------------------------------------------------
-%%% @doc
-%%% emqttd mysql authentication app.
-%%%
-%%% @end
-%%%-----------------------------------------------------------------------------
--module(emqttd_plugin_mysql_app).
--on_load(init/0).
--behaviour(application).
-%% Application callbacks
--export([start/2, prep_stop/1, stop/1, nif_pbkdf2_check/2]).
-
--behaviour(supervisor).
-%% Supervisor callbacks
--export([init/1]).
--define(NOT_LOADED, not_loaded(?LINE)).
-
-
-%%%=============================================================================
-%%% Application callbacks
-%%%=============================================================================
-
-start(_StartType, _StartArgs) ->
-  Env = application:get_all_env(),
-  emqttd_access_control:register_mod(auth, emqttd_auth_mysql, Env),
-  emqttd_access_control:register_mod(acl, emqttd_acl_mysql, Env),
-  crypto:start(),
-  supervisor:start_link({local, ?MODULE}, ?MODULE, []).
-
-prep_stop(State) ->
-  emqttd_access_control:unregister_mod(auth, emqttd_auth_mysql), State,
-  emqttd_access_control:unregister_mod(acl, emqttd_acl_mysql), State,
-  crypto:stop().
-
-stop(_State) ->
-  ok.
-
-init() ->
-  PrivDir = case code:priv_dir(?MODULE) of
-              {error, _} ->
-                EbinDir = filename:dirname(code:which(?MODULE)),
-                AppPath = filename:dirname(EbinDir),
-                filename:join(AppPath, "priv");
-              Path ->
-                Path
-            end,
-  erlang:load_nif(filename:join(PrivDir, "emqttd_plugin_mysql_app"), 0).
-
-%%%=============================================================================
-%%% Supervisor callbacks(Dummy)
-%%%=============================================================================
-
-init([]) ->
-  {ok, {{one_for_one, 5, 10}, []}}.
-
-not_loaded(Line) ->
-  erlang:nif_error({not_loaded, [{module, ?MODULE}, {line, Line}]}).
-
-nif_pbkdf2_check(Password, Hash) ->
-  ?NOT_LOADED.