diff --git a/Makefile b/Makefile
index cc02a1d..e802b7e 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ OBJ := sha
 
 all: aes.o sha.o
 	$(CC) $(CFLAGS) -o $(OBJ) $^ $(LDFLAGS)
-	$(STRIP) $(OBJ)
+	: $(STRIP) $(OBJ)
 .c.o:
 	$(CC) $(CFLAGS) -c $<
 
diff --git a/README.md b/README.md
index 8778fed..a29dc17 100644
--- a/README.md
+++ b/README.md
@@ -18,15 +18,13 @@
 
 ## Help Information
 
-                        SHA
+                            SHA
         Shell Strict AES 128 bit encryption tool
-    Author: AIXIAO@AIXIAO.ME
+    AUTHOR: AIXIAO@AIXIAO.ME
 
     Usage:
-        sha [-kfh?]
-            -k      : Key
-            -f      : Script File
-            -h -?   : Print Help
+        -k    : key
+        -f    : Script file
 
 
     静态链接:
diff --git a/aes.h b/aes.h
index 0180192..cd7b2ed 100644
--- a/aes.h
+++ b/aes.h
@@ -21,9 +21,9 @@
 #define CTR 1
 #endif
 
-#define AES128 1
+//#define AES128 1
 //#define AES192 1
-//#define AES256 1
+#define AES256 1
 
 #define AES_BLOCKLEN 16         // Block length in bytes - AES is 128b block only
 
diff --git a/sha.c b/sha.c
index 6779bd1..02710d3 100644
--- a/sha.c
+++ b/sha.c
@@ -21,7 +21,7 @@ long file_size;
 
 static void hex2str(uint8_t * input, uint16_t input_len, char *output)
 {
-    char *hexEncode = "0123456789ABCDEF";
+    const char *hexEncode = "0123456789ABCDEF";
     int i = 0, j = 0;
 
     for (i = 0; i < input_len; i++) {
@@ -84,9 +84,9 @@ char *source_c[] = {
     "#define CTR 1",
     "#endif",
     "",
-    "#define AES128 1",
+    "//#define AES128 1",
     "//#define AES192 1",
-    "//#define AES256 1",
+    "#define AES256 1",
     "",
     "#define AES_BLOCKLEN 16         // Block length in bytes - AES is 128b block only",
     "",
@@ -603,7 +603,8 @@ char *source_c[] = {
     "    if (0 == strncmp(shbin, \"#!\", 2))",
     "    {",
     "        p1 = strchr(shbin, '/');",
-    "        strcpy(shbin, p1);",
+    "        memcpy(shbin, p1, (p - shll_text) - 2);",
+    "        shbin[(p - shll_text) - 2] = '\\0';",
     "    }",
     "    else if (0 == strncmp(shbin, \":\", 1))",
     "    {",
@@ -656,14 +657,14 @@ char *source_c[] = {
     "int main(int argc, char *argv[])",
     "{",
     "    char *argvs[BUFFER_SIZE];",
+    "    char *shbin = NULL;",
     "    int l=1;",
     "    int i=4;",
     "",
     "    struct AES_ctx ctx;",
     "    uint8_t *Hex_string = (uint8_t *) malloc(encrypted_text_len*2);",
-    "    char *shbin = NULL;",
-    "",
 
+    "",
     "    reverse_string((char *)Encrypted_data, encrypted_text_len*2);",
     "    memset(Hex_string, 0, encrypted_text_len*2);",
     "",
@@ -722,28 +723,21 @@ char *source_c[] = {
     0
 };
 
-void reverse_string(char *str)
+void reverse_string(char *str, int length)
 {
-    int length;
-    char *p1;
-    char *p2;
-
-    length = strlen(str);       //获取字符串长度
-    p1 = str;                   //p1指向字符串首地址
-    p2 = str + length - 1;      //p2指向字符串尾地址
-    if (!str) {
+    if (str == NULL) {
         printf("空指针错误！");
         return;
     }
-    while (p1 < p2)             //当p1地址小于p2地址时执行循环
-    {
-        char c = *p1;
-        *p1 = *p2;              //完成指针指向地址的值的交换
-        *p2 = c;
-        p1++;                   //交换完毕后p1指针指向下一个字符地址
-        p2--;                   //交换完毕后p2指针指向上一个字符地址
-    }
 
+    char *start = str;
+    char *end = str + length - 1;
+
+    while (start < end) {
+        char temp = *start;
+        *start++ = *end;
+        *end-- = temp;
+    }
 }
 
 void usage(void)
@@ -774,12 +768,12 @@ char pool[] = {
 
 int rand_key(char *key)
 {
-    int PASSWD_LEN = 16;
+    int PASSWD_LEN = 32;
     struct timeval tpstart;
-    char password[17];
+    char password[33];
     int i = 0;
 
-    memset(password, 0, 17);
+    memset(password, 0, 33);
     gettimeofday(&tpstart, NULL);
     srand(tpstart.tv_usec);
 
@@ -794,7 +788,7 @@ int rand_key(char *key)
 
 int main(int argc, char *argv[])
 {
-    static uint8_t key[17] = "";
+    static uint8_t key[33] = "";
     char sh_file[1024];
     int indx = 0;
 
@@ -866,15 +860,15 @@ int main(int argc, char *argv[])
     //转16进制字符串
     hex2str(text_content, file_size, (char *)hexString);
 
-    reverse_string((char *)hexString);
+    reverse_string((char *)hexString, text_content_length*2);
 
     //拼接
-    strcat((char *)encrypted_text, "char Encrypted_data[]=\"");
-    strcat((char *)encrypted_text, (const char *)hexString);
+    strncat((char *)encrypted_text, "char Encrypted_data[]=\"", 24);
+    strncat((char *)encrypted_text, (const char *)hexString, text_content_length*2);
     strcat((char *)encrypted_text, "\";");
 
-    strcpy(encrypted_key, "const char key[17] = \"");
-    strcat((char *)encrypted_key, (char *)key);
+    memcpy(encrypted_key, "const char key[33] = \"", 23);
+    strncat((char *)encrypted_key, (char *)key, 32);
     strcat((char *)encrypted_key, "\";");
 
     // 长度
@@ -916,6 +910,8 @@ int main(int argc, char *argv[])
 
     //remove(sourcefile);
     free(buff);
+    free(hexString);
+
 
     // 压缩
     if (system("which upx 1> /dev/null") == 0) {