BLE privacy, signing, persistent security database

.gitignore

@@ -86,3 +86,5 @@ tags
 
 # Visual Studio Code
 .vscode/
+
+features/FEATURE_BLE/targets/TARGET_CORDIO/stack_backup/

features/FEATURE_BLE/ble/ArrayView.h

@@ -17,8 +17,11 @@
 #ifndef BLE_ARRAY_VIEW_H_
 #define BLE_ARRAY_VIEW_H_
 
+#include <algorithm>
+
 #include <stddef.h>
 #include <stdint.h>
+#include "platform/mbed_assert.h"
 
 /**
  * @addtogroup ble
@@ -33,11 +36,18 @@
 
 namespace ble {
 
+/**
+ * Special value for the Size parameter of ArrayView.
+ * If the type use this value then the size of the array is stored in the object
+ * at runtime.
+ */
+#define ARRAY_VIEW_DYNAMIC_SIZE -1
+
 /**
  * Immutable view to an array.
  *
  * Array views encapsulate the pointer to an array and its size into a single
- * object; however, it does not manage the lifetime of the array viewed.
+ * object or type; however, it does not manage the lifetime of the array viewed.
  * You can use instances of ArrayView to replace the traditional pair of pointer
  * and size arguments in function calls.
  *
@@ -48,20 +58,28 @@ namespace ble {
  * @note You can create ArrayView instances with the help of the function
  * template make_ArrayView() and make_const_ArrayView().
  *
+ * @note ArrayView<T, Size> objects can be implicitly converted to ArrayView<T>
+ * objects where required.
+ *
  * @tparam T type of objects held by the array.
+ * @tparam Size The size of the array viewed. The default value
+ * ARRAY_VIEW_DYNAMIC_SIZE is special as it allows construction of ArrayView
+ * objects of any size (set at runtime).
  */
-template<typename T>
+template<typename T, ptrdiff_t Size = ARRAY_VIEW_DYNAMIC_SIZE>
 struct ArrayView {
 
+    MBED_STATIC_ASSERT(Size >= 0, "Invalid size for an ArrayView");
+
     /**
      * Construct a view to an empty array.
      *
      * @post a call to size() will return 0, and data() will return NULL.
      */
-    ArrayView() : _array(0), _size(0) { }
+    ArrayView() : _array(NULL) { }
 
     /**
-     * Construct an array view from a pointer to a buffer and its size.
+     * Construct an array view from a pointer to a buffer.
      *
      * @param array_ptr Pointer to the array data
      * @param array_size Number of elements of T present in the array.
@@ -70,7 +88,9 @@ struct ArrayView {
      * array_tpr.
      */
     ArrayView(T* array_ptr, size_t array_size) :
-    	_array(array_ptr), _size(array_size) { }
+    	_array(array_ptr) {
+        MBED_ASSERT(array_size >= (size_t) Size);
+    }
 
     /**
      * Construct an array view from the reference to an array.
@@ -82,9 +102,8 @@ struct ArrayView {
      * @post a call to size() will return Size, and data() will return
      * a pointer to elements.
      */
-    template<size_t Size>
     ArrayView(T (&elements)[Size]):
-		_array(elements), _size(Size) { }
+		_array(elements) { }
 
     /**
      * Return the size of the array viewed.
@@ -93,7 +112,7 @@ struct ArrayView {
      */
     size_t size() const
     {
-    	return _size;
+    	return _array ? Size : 0;
     }
 
     /**
@@ -144,40 +163,115 @@ struct ArrayView {
         return _array;
     }
 
+private:
+    T* const _array;
+};
+
+/**
+ * ArrayView specialisation that handle dynamic array size.
+ */
+template<typename T>
+struct ArrayView<T, ARRAY_VIEW_DYNAMIC_SIZE> {
+
+    /**
+     * Construct a view to an empty array.
+     *
+     * @post a call to size() will return 0, and data() will return NULL.
+     */
+    ArrayView() : _array(0), _size(0) { }
+
+    /**
+     * Construct an array view from a pointer to a buffer and its size.
+     *
+     * @param array_ptr Pointer to the array data
+     * @param array_size Number of elements of T present in the array.
+     *
+     * @post a call to size() will return array_size and data() will return
+     * array_tpr.
+     */
+    ArrayView(T* array_ptr, size_t array_size) :
+        _array(array_ptr), _size(array_size) { }
+
     /**
-     * Equality operator.
+     * Construct an array view from the reference to an array.
      *
-     * @param lhs Left hand side of the binary operation.
-     * @param rhs Right hand side of the binary operation.
+     * @param elements Reference to the array viewed.
+     *
+     * @tparam Size Number of elements of T presents in the array.
+     *
+     * @post a call to size() will return Size, and data() will return
+     * a pointer to elements.
+     */
+    template<size_t Size>
+    ArrayView(T (&elements)[Size]):
+        _array(elements), _size(Size) { }
+
+
+    /**
+     * Construct a ArrayView object with a dynamic size from an ArrayView object
+     * with a static size.
+     * @param other The ArrayView object used to construct this.
+     */
+    template<size_t Size>
+    ArrayView(ArrayView<T, Size> other):
+        _array(other.data()), _size(other.size()) { }
+
+    /**
+     * Return the size of the array viewed.
      *
-     * @return True if arrays in input have the same size and the same content
-     * and false otherwise.
+     * @return The number of elements present in the array viewed.
      */
-    friend bool operator==(const ArrayView& lhs, const ArrayView& rhs)
+    size_t size() const
     {
-    	if (lhs.size() != rhs.size()) {
-    		return false;
-    	}
+        return _size;
+    }
 
-    	if (lhs.data() == rhs.data()) {
-    		return true;
-    	}
+    /**
+     * Access to a mutable element of the array.
+     *
+     * @param index Element index to access.
+     *
+     * @return A reference to the element at the index specified in input.
+     *
+     * @pre index shall be less than size().
+     */
+    T& operator[](size_t index)
+    {
+        return _array[index];
+    }
 
-    	return memcmp(lhs.data(), rhs.data(), lhs.size()) == 0;
+    /**
+     * Access to an immutable element of the array.
+     *
+     * @param index Element index to access.
+     *
+     * @return A const reference to the element at the index specified in input.
+     *
+     * @pre index shall be less than size().
+     */
+    const T& operator[](size_t index) const
+    {
+        return _array[index];
     }
 
     /**
-     * Not equal operator
+     * Get the raw pointer to the array.
      *
-     * @param lhs Left hand side of the binary operation.
-     * @param rhs Right hand side of the binary operation.
+     * @return The raw pointer to the array.
+     */
+    T* data()
+    {
+        return _array;
+    }
+
+    /**
+     * Get the raw const pointer to the array.
      *
-     * @return True if arrays in input do not have the same size or the same
-     * content and false otherwise.
+     * @return The raw pointer to the array.
      */
-    friend bool operator!=(const ArrayView& lhs, const ArrayView& rhs)
+    const T* data() const
     {
-    	return !(lhs == rhs);
+        return _array;
     }
 
 private:
@@ -186,6 +280,45 @@ struct ArrayView {
 };
 
 
+/**
+ * Equality operator.
+ *
+ * @param lhs Left hand side of the binary operation.
+ * @param rhs Right hand side of the binary operation.
+ *
+ * @return True if arrays in input have the same size and the same content
+ * and false otherwise.
+ */
+template<typename T, ptrdiff_t LhsSize, ptrdiff_t RhsSize>
+bool operator==(const ArrayView<T, LhsSize>& lhs, const ArrayView<T, LhsSize>& rhs)
+{
+    if (lhs.size() != rhs.size()) {
+        return false;
+    }
+
+    if (lhs.data() == rhs.data()) {
+        return true;
+    }
+
+    return std::equal(lhs.data(), lhs.data() + lhs.size(), rhs.data());
+}
+
+/**
+ * Not equal operator
+ *
+ * @param lhs Left hand side of the binary operation.
+ * @param rhs Right hand side of the binary operation.
+ *
+ * @return True if arrays in input do not have the same size or the same
+ * content and false otherwise.
+ */
+template<typename T, ptrdiff_t LhsSize, ptrdiff_t RhsSize>
+bool operator!=(const ArrayView<T, LhsSize>& lhs, const ArrayView<T, LhsSize>& rhs)
+{
+    return !(lhs == rhs);
+}
+
+
 /**
  * Generate an array view from a reference to a C/C++ array.
  *
@@ -200,9 +333,28 @@ struct ArrayView {
  * created 'inline'.
  */
 template<typename T, size_t Size>
-ArrayView<T> make_ArrayView(T (&elements)[Size])
+ArrayView<T, Size> make_ArrayView(T (&elements)[Size])
 {
-    return ArrayView<T>(elements);
+    return ArrayView<T, Size>(elements);
+}
+
+/**
+ * Generate an array view from a pointer to a C/C++ array.
+ *
+ * @tparam Size Number of items held in elements.
+ * @tparam T Type of elements held in elements.
+ *
+ * @param elements The reference to the array viewed.
+ *
+ * @return The ArrayView to elements.
+ *
+ * @note This helper avoids the typing of template parameter when ArrayView is
+ * created 'inline'.
+ */
+template<size_t Size, typename T>
+ArrayView<T, Size> make_ArrayView(T* elements)
+{
+    return ArrayView<T, Size>(elements, Size);
 }
 
 /**
@@ -237,9 +389,28 @@ ArrayView<T> make_ArrayView(T* array_ptr, size_t array_size)
  * created 'inline'.
  */
 template<typename T, size_t Size>
-ArrayView<const T> make_const_ArrayView(T (&elements)[Size])
+ArrayView<const T, Size> make_const_ArrayView(T (&elements)[Size])
+{
+    return ArrayView<const T, Size>(elements);
+}
+
+/**
+ * Generate a const array view from a pointer to a C/C++ array.
+ *
+ * @tparam Size Number of items held in elements.
+ * @tparam T Type of elements held in elements.
+ *
+ * @param elements The reference to the array viewed.
+ *
+ * @return The ArrayView to elements.
+ *
+ * @note This helper avoids the typing of template parameter when ArrayView is
+ * created 'inline'.
+ */
+template<size_t Size, typename T>
+ArrayView<const T, Size> make_const_ArrayView(const T* elements)
 {
-    return ArrayView<const T>(elements);
+    return ArrayView<const T, Size>(elements, Size);
 }
 
 /**

features/FEATURE_BLE/ble/BLE.h

@@ -457,9 +457,7 @@ class BLE
     ble_error_t setAddress(
         BLEProtocol::AddressType_t type,
         const BLEProtocol::AddressBytes_t address
-    ) {
-        return gap().setAddress(type, address);
-    }
+    );
 
     /**
      * Fetch the Bluetooth Low Energy MAC address and type.
@@ -1009,9 +1007,7 @@ class BLE
     ble_error_t connect(const BLEProtocol::AddressBytes_t  peerAddr,
                         BLEProtocol::AddressType_t         peerAddrType = BLEProtocol::AddressType::RANDOM_STATIC,
                         const Gap::ConnectionParams_t     *connectionParams = NULL,
-                        const GapScanningParams           *scanParams = NULL) {
-        return gap().connect(peerAddr, peerAddrType, connectionParams, scanParams);
-    }
+                        const GapScanningParams           *scanParams = NULL);
 
     /**
      * This call initiates the disconnection procedure, and its completion is
@@ -1045,9 +1041,7 @@ class BLE
      * connection.
      */
     MBED_DEPRECATED("Use ble.gap().disconnect(...)")
-    ble_error_t disconnect(Gap::DisconnectionReason_t reason) {
-        return gap().disconnect(reason);
-    }
+    ble_error_t disconnect(Gap::DisconnectionReason_t reason);
 
     /**
      * Returns the current Gap state of the device using a bitmask that