diff --git a/misc/my_encrypt.cpp b/misc/my_encrypt.cpp
index 3810fb8..462b754 100644
--- a/misc/my_encrypt.cpp
+++ b/misc/my_encrypt.cpp
@@ -60,8 +60,61 @@ using namespace std;
 	sm4Encode.sm4_enc(input,strlen(input),output,szKey); 
  }
 
-//////////////////////////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////////////////////////lnk20250728
 
+/**
+ * SM4 ECB 解密函数（ZeroPadding）
+ * @param encrypted_base64_str 加密后的 Base64 字符串
+ * @param key_str 16字节密钥（明文）
+ * @param decrypted_output 解密后输出的字符串，需由调用者预先分配内存
+ * @return 0 成功，非 0 失败
+ */
+// 注意：这里使用 ZeroPadding，因此需要去除末尾 0
+int sm4_ecb_decrypt_zeropad_base64(const char* base64_cipher, const char* key_str, char* plaintext_out) {
+    if (!base64_cipher || !key_str || !plaintext_out) {
+        return -1;
+    }
 
+    // base64 decode
+    unsigned char cipher_bin[256] = {0};
+	long cipher_len = 0;                   // 输出长度
+    int ret = base64_decode(base64_cipher, strlen(base64_cipher),
+                        (char*)cipher_bin, &cipher_len);
+	if (ret != 0) {
+    	// 解码失败处理
+    	return -1;
+	}
+	
+    if (cipher_len <= 0 || cipher_len % 16 != 0) {
+        return -2; // SM4 块长度必须为 16 的倍数
+    }
 
+    // 准备 key
+    if (strlen(key_str) != 16) {
+        return -3; // SM4 要求密钥是 16 字节
+    }
+
+    unsigned char key_bin[16] = {0};
+    memcpy(key_bin, key_str, 16);
+
+    // 初始化 SM4 解密上下文
+    sm4_context ctx;
+    SM4 sm4;
+    sm4.sm4_setkey_dec(&ctx, key_bin);
+
+    // 解密
+    unsigned char plain_buf[256] = {0};
+    sm4.sm4_crypt_ecb(&ctx, SM4_DECRYPT, cipher_len, cipher_bin, plain_buf);
+
+    // 去除 zero padding（末尾的 0x00）
+    int plain_len = cipher_len;
+    while (plain_len > 0 && plain_buf[plain_len - 1] == 0x00) {
+        plain_len--;
+    }
+
+    memcpy(plaintext_out, plain_buf, plain_len);
+    plaintext_out[plain_len] = '\0';
+
+    return 0;
+}
 
diff --git a/mms/db_interface.h b/mms/db_interface.h
index ed1386d..a43008e 100644
--- a/mms/db_interface.h
+++ b/mms/db_interface.h
@@ -56,6 +56,8 @@ extern char* POSTGRES_TABLEPREFIX;
 void GetSM4Code(unsigned char* pSerise,char* pKey,char* output);
 void MyGetSM4Code(char* input,unsigned char* szKey,char* output);
 
+int sm4_ecb_decrypt_zeropad_base64(const char* base64_cipher, const char* key_str, char* plaintext_out);//lnk20250728
+
 void try_start_kafka_thread();
 
 void try_start_mqconsumer_thread();//lnk20241216
@@ -149,6 +151,8 @@ int parse_device_cfg_web();
 int parse_model_cfg_web();
 void SOEFileWeb(char* localpath,char* cloudpath,char* wavepath);
 const char* get_front_msg_from_subdir();
+
+
 //////////////////////////////////////////////////////////////////////////////////////
 typedef struct {
     char WavePhasicFlag[64];
diff --git a/mms/main.c b/mms/main.c
index 1a0f4a1..1211202 100644
--- a/mms/main.c
+++ b/mms/main.c
@@ -218,8 +218,6 @@ int main(int argc, const char **argv)
 		return rv;
 	}
 
-
-
 	getVersion(argc,argv);
 
 	rv=parse_param(argc, argv);
diff --git a/mms/mmsclient.c b/mms/mmsclient.c
index 39999b4..2a7c569 100644
--- a/mms/mmsclient.c
+++ b/mms/mmsclient.c
@@ -1182,7 +1182,23 @@ S_SEC_ENCRYPT_CTRL *encryptCtrl = NULL;	/* conn enctryption info	*/
 	      authInfo->auth_pres = SD_TRUE;
 	      authInfo->mech_type = ACSE_AUTH_MECH_PASSWORD;
 	      memset(ied_password,0,sizeof(ied_password));
-        GetSM4Code((unsigned char*)dev_series,dev_key,ied_password);
+
+        //浼犺繘鏉ョ殑灏辨槸鍔犲瘑杩囩殑鍏堣В瀵嗘垚鏄庢枃鍐嶄紶鍏�
+        const char* key = "11HDESaAhiHHug2z";//涓婂眰浣跨敤鐨勫啓姝荤殑key
+        char dev_series_plaintext[256] = {0};
+        char dev_key_plaintext[256] = {0};
+
+        int ret1 = sm4_ecb_decrypt_zeropad_base64(dev_series, key, dev_series_plaintext);
+        int ret2 = sm4_ecb_decrypt_zeropad_base64(dev_key, key, dev_key_plaintext);
+        if (ret1 == 0 && ret2 == 0) {
+            printf("璇嗗埆鐮佽В瀵嗘垚鍔焅n");
+            //printf("瑙ｅ瘑鍚庣殑 dev_series: %s\n", dev_series_plaintext);
+            //printf("瑙ｅ瘑鍚庣殑 dev_key   : %s\n", dev_key_plaintext);
+        } else {
+            printf("璇嗗埆鐮佽В瀵嗗け璐n");
+        }
+
+        GetSM4Code((unsigned char*)dev_series_plaintext,dev_key_plaintext,ied_password);
 	      strcpy (authInfo->u.pw_auth.password, ied_password);	
     } else {
         printf("dev_series or dev_key is null or space!\n");