diff --git a/encrypt.cpp b/encrypt.cpp
index a07828d..5ad9f6e 100755
--- a/encrypt.cpp
+++ b/encrypt.cpp
@@ -208,6 +208,10 @@ int de_padding(const char *data ,int &data_len,int padding_num)
 }
 int cipher_aes128cbc_encrypt(const char *data,char *output,int &len,char * key)
 {
+	static int first_time=1;
+	if(first_time==0) key=0;
+	else first_time=0;
+
 	char buf[buf_len];
 	memcpy(buf,data,len);//TODO inefficient code
 
@@ -253,6 +257,9 @@ int cipher_none_encrypt(const char *data,char *output,int &len,char * key)
 }
 int cipher_aes128cbc_decrypt(const char *data,char *output,int &len,char * key)
 {
+	static int first_time=1;
+	if(first_time==0) key=0;
+	else first_time=0;
 
 	if(len%16 !=0) {mylog(log_debug,"len%%16!=0\n");return -1;}
 	//if(len<0) {mylog(log_debug,"len <0\n");return -1;}
diff --git a/lib/aes_acc/aesacc.c b/lib/aes_acc/aesacc.c
index c994d31..ee87d22 100644
--- a/lib/aes_acc/aesacc.c
+++ b/lib/aes_acc/aesacc.c
@@ -340,30 +340,34 @@ int AES_support_hwaccel(void)
 void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv)
 {
   uint8_t iv_tmp[16];
-  uint8_t rk[AES_RKSIZE];
+  static uint8_t rk[AES_RKSIZE];
 
-  if (key == NULL || iv == NULL)
+  if (iv == NULL)
   {
     return;
   }
   aeshw_init();
   memcpy(iv_tmp, iv, 16);
-  setkey_enc(rk, key);
+  if(key!= NULL)
+	  setkey_enc(rk, key);
   encrypt_cbc(rk, length, iv_tmp, input, output);
 }
 
 void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv)
 {
   uint8_t iv_tmp[16];
-  uint8_t rk[AES_RKSIZE];
+  static uint8_t rk[AES_RKSIZE];
 
-  if (key == NULL || iv == NULL)
+  if (iv == NULL)
   {
     return;
   }
   aeshw_init();
   memcpy(iv_tmp, iv, 16);
-  setkey_dec(rk, key);
+  if(key!= NULL)
+  {
+	  setkey_dec(rk, key);
+  }
   decrypt_cbc(rk, length, iv_tmp, input, output);
 }
 
diff --git a/lib/aes_faster_c/wrapper.c b/lib/aes_faster_c/wrapper.c
index 4094fee..f7119dd 100644
--- a/lib/aes_faster_c/wrapper.c
+++ b/lib/aes_faster_c/wrapper.c
@@ -11,55 +11,45 @@
 #endif
 
 
-static aes_context ctx_de;
-static aes_context ctx_en;
-inline void init_de()
-{
-	static int done=0;
-	if(done==0)
-	{
-		aes_init( &ctx_de );
-		done=1;
-	}
-}
-inline void init_en()
-{
-	static int done=0;
-	if(done==0)
-	{
-		aes_init( &ctx_en);
-		done=1;
-	}
-}
 void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length)
 {
-	init_en();
 	printf("AES_ECB_encrypt not implemented\n");
 	exit(-1);
 }
 void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length)
 {
-	init_de();
 	printf("AES_ECB_encrypt not implemented\n");
 	exit(-1);
 }
 
 void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv)
 {
+	static aes_context ctx;
+	static int done=0;
+	if(done==0)
+	{
+		aes_init( &ctx);
+		done=1;
+	}
 	char tmp_iv[16];
-	init_en();
-	if(key!=0) aes_setkey_enc(&ctx_en,key,AES_KEYSIZE);
+	if(key!=0) aes_setkey_enc(&ctx,key,AES_KEYSIZE);
 
 	memcpy(tmp_iv,iv,16);
-	aes_crypt_cbc( &ctx_en, AES_ENCRYPT, length, (unsigned char* )tmp_iv, (const unsigned char*)input,(unsigned char*) output );
+	aes_crypt_cbc( &ctx, AES_ENCRYPT, length, (unsigned char* )tmp_iv, (const unsigned char*)input,(unsigned char*) output );
 	return ;
 }
 void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv)
 {
+	static aes_context ctx;
+	static int done=0;
+	if(done==0)
+	{
+		aes_init( &ctx);
+		done=1;
+	}
 	char tmp_iv[16];
-	init_de();
-	if(key!=0) aes_setkey_dec(&ctx_de,key,AES_KEYSIZE);
+	if(key!=0) aes_setkey_dec(&ctx,key,AES_KEYSIZE);
 	memcpy(tmp_iv,iv,16);
-	aes_crypt_cbc( &ctx_de, AES_DECRYPT, length, (unsigned char*)tmp_iv, (const unsigned char*)input, (unsigned char*) output );
+	aes_crypt_cbc( &ctx,AES_DECRYPT, length, (unsigned char*)tmp_iv, (const unsigned char*)input, (unsigned char*) output );
 	return;
 }