SE050: add API to read serial number raw bytes

Author: pennam

libraries/SE05X/src/SE05X.cpp

@@ -69,7 +69,6 @@
                                              SE05X_EC_SIGNATURE_RAW_LENGTH
 
 #define SE05X_SHA256_LENGTH              32
-#define SE05X_SN_LENGTH                  18
 
 #define SE05X_TEMP_OBJECT                9999
 
@@ -108,22 +107,29 @@ void SE05XClass::end()
     Se05x_API_SessionClose(&_se05x_session);
 }
 
-String SE05XClass::serialNumber()
+int SE05XClass::serialNumber(byte sn[], size_t length)
 {
-    String result = (char*)NULL;
-    byte UID[SE05X_SN_LENGTH];
-    size_t uidLen = SE05X_SN_LENGTH;
+    size_t uidLen;
     const int kSE05x_AppletResID_UNIQUE_ID = 0x7FFF0206,
 
-    status = Se05x_API_ReadObject(&_se05x_session, kSE05x_AppletResID_UNIQUE_ID, 0, uidLen, UID, &uidLen);
-    if (status != SM_OK) {
+    status = Se05x_API_ReadObject(&_se05x_session, kSE05x_AppletResID_UNIQUE_ID, 0, length, sn, &uidLen);
+    if (status != SM_OK || length != uidLen) {
         SMLOG_E("Error in Se05x_API_ReadObject \n");
-        return "";
+        return 0;
     }
+    return 1;
+}
+
+String SE05XClass::serialNumber()
+{
+    String result = (char*)NULL;
+    byte UID[SE05X_SN_LENGTH];
+
+    serialNumber(UID, sizeof(UID));
 
-    result.reserve(uidLen * 2);
+    result.reserve(SE05X_SN_LENGTH * 2);
 
-    for (size_t i = 0; i < uidLen; i++) {
+    for (size_t i = 0; i < SE05X_SN_LENGTH; i++) {
         byte b = UID[i];
 
         if (b < 16) {

libraries/SE05X/src/SE05X.h

@@ -33,6 +33,8 @@ extern "C" {
 }
 #endif
 
+#define SE05X_SN_LENGTH 18
+
 class SE05XClass
 {
 public:
@@ -42,6 +44,7 @@ class SE05XClass
     int begin();
     void end();
 
+    int serialNumber(byte sn[], size_t length);
 #if defined (ARDUINO)
     String serialNumber();
 #endif