[pw_fuzzer] Add FuzzTests for PASE Message Receiving (project-chip#36445)

* Add FuzzTests for PASE Message Receiving

* Integrating Comments

* Removing two unused global string constants

* Integrating Comments

Author: Alami-Amine

src/protocols/secure_channel/PASESession.cpp

@@ -54,9 +54,7 @@ using namespace Crypto;
 using namespace Messaging;
 using namespace Protocols::SecureChannel;
 
-const char kSpake2pContext[]        = "CHIP PAKE V1 Commissioning";
-const char kSpake2pI2RSessionInfo[] = "Commissioning I2R Key";
-const char kSpake2pR2ISessionInfo[] = "Commissioning R2I Key";
+const char kSpake2pContext[] = "CHIP PAKE V1 Commissioning";
 
 // Amounts of time to allow for server-side processing of messages.
 //

src/protocols/secure_channel/PASESession.h

@@ -43,7 +43,9 @@
 #include <transport/raw/PeerAddress.h>
 
 namespace chip {
-
+namespace Testing {
+class TestPASESession;
+}
 extern const char kSpake2pI2RSessionInfo[];
 extern const char kSpake2pR2ISessionInfo[];
 
@@ -174,6 +176,7 @@ class DLL_EXPORT PASESession : public Messaging::UnsolicitedMessageHandler,
         kInvalidKeyConfirmation = 0x00,
         kUnexpected             = 0xff,
     };
+    friend class Testing::TestPASESession;
 
     CHIP_ERROR Init(SessionManager & sessionManager, uint32_t setupCode, SessionEstablishmentDelegate * delegate);