diff --git a/include/common.h b/include/common.h
index 5518d3d..92db949 100644
--- a/include/common.h
+++ b/include/common.h
@@ -47,6 +47,7 @@ uint8_t check_port(uint16_t port);
 uint16_t gen_rand_num(uint16_t limit);
 char* uint32_to_string(uint32_t number);
 
+char* gen_bcrypt(const char *data);
 int run_command(const char *command);
 
 char* string_init(const char *str);
diff --git a/src/cleardns.c b/src/cleardns.c
index 8482512..93155bc 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -34,29 +34,15 @@
 //    fprintf(stderr, "\"\n");
 //}
 
-#include "bcrypt.h"
+
 
 int main(int argc, char *argv[]) { // ClearDNS server
 
     LOG_LEVEL = LOG_DEBUG;
     log_info("ClearDNS server start (%s)", VERSION);
 
-
-    char salt[BCRYPT_HASHSIZE];
-    log_info("size -> %d", BCRYPT_HASHSIZE);
-    int ret = bcrypt_gensalt(10, salt);
-    log_info("gensalt ret -> %d", ret);
-    log_info("salt -> %s", salt);
-
-    char passwd[] = "dnomd343";
-    log_info("passwd -> %s", passwd);
-    char hash[BCRYPT_HASHSIZE];
-    ret = bcrypt_hashpw(passwd, salt, hash);
-    log_info("hashpw ret -> %d", ret);
-    log_info("hash -> %s", hash);
-
-    ret = bcrypt_checkpw(passwd, hash);
-    log_info("checkpw ret -> %d", ret);
+    char *ret = gen_bcrypt("dnomd343");
+    log_info("%s", ret);
 
 
 //    load_config("test.json");
diff --git a/src/common.c b/src/common.c
index cce8d0d..c542bb7 100644
--- a/src/common.c
+++ b/src/common.c
@@ -6,6 +6,7 @@
 #include "common.h"
 #include "logger.h"
 #include "structure.h"
+#include "bcrypt.h"
 
 char* show_bool(uint8_t value) { // return `true` or `false`
     if (value) {
@@ -60,6 +61,22 @@ int run_command(const char *command) {
     return system(command) / 256;
 }
 
+char* gen_bcrypt(const char *data) {
+    char salt[BCRYPT_HASHSIZE];
+    log_debug("BCrypt data -> `%s`", data);
+    if (bcrypt_gensalt(10, salt)) {
+        log_fatal("BCrypt generate salt error");
+    }
+    log_debug("BCrypt salt -> `%s`", salt);
+
+    char *hash = (char *)malloc(BCRYPT_HASHSIZE);
+    if (bcrypt_hashpw(data, salt, hash)) {
+        log_fatal("BCrypt generate hash error");
+    }
+    log_debug("BCrypt hash -> `%s`", hash);
+    return hash;
+}
+
 void save_file(const char *file, const char *content) { // save into file
     log_debug("Write into `%s` -> \n%s", file, content);
     FILE* fp = fopen(file , "w");