diff --git a/src/client/Util.cpp b/src/client/Util.cpp
new file mode 100644
index 0000000..1cef9b6
--- /dev/null
+++ b/src/client/Util.cpp
@@ -0,0 +1,5 @@
+#include "client/Util.hpp"
+
+void ChecksumExecutables(const uint8_t* challenge, uint32_t challengeLength, uint8_t* checksum) {
+    // TODO
+}
diff --git a/src/client/Util.hpp b/src/client/Util.hpp
new file mode 100644
index 0000000..10bdd8a
--- /dev/null
+++ b/src/client/Util.hpp
@@ -0,0 +1,8 @@
+#ifndef CLIENT_UTIL_HPP
+#define CLIENT_UTIL_HPP
+
+#include <cstdint>
+
+void ChecksumExecutables(const uint8_t* challenge, uint32_t challengeLength, uint8_t* checksum);
+
+#endif
diff --git a/src/glue/CGlueMgr.cpp b/src/glue/CGlueMgr.cpp
index a004c00..656bc3f 100644
--- a/src/glue/CGlueMgr.cpp
+++ b/src/glue/CGlueMgr.cpp
@@ -1,6 +1,7 @@
 #include "glue/CGlueMgr.hpp"
 #include "client/Client.hpp"
 #include "client/ClientServices.hpp"
+#include "client/Util.hpp"
 #include "console/CVar.hpp"
 #include "glue/CRealmList.hpp"
 #include "gx/Coordinate.hpp"
@@ -485,10 +486,10 @@ void CGlueMgr::PollLoginServerLogin() {
     }
 
     case LOGIN_STATE_CHECKINGVERSIONS: {
-        uint8_t versionChecksum[20];
-        // TODO
-        // uint8_t* versionChallenge = ClientServices::LoginConnection()->GetVersionChallenge();
-        // ChecksumExecutables(versionChallenge, 16, versionChecksum);
+        uint8_t versionChecksum[VERSION_CHECKSUM_LEN];
+        auto versionChallenge = ClientServices::LoginConnection()->GetVersionChallenge();
+        ChecksumExecutables(versionChallenge, VERSION_CHALLENGE_LEN, versionChecksum);
+
         ClientServices::LoginConnection()->ProveVersion(versionChecksum);
 
         break;
diff --git a/src/net/Types.hpp b/src/net/Types.hpp
index b70de69..809361e 100644
--- a/src/net/Types.hpp
+++ b/src/net/Types.hpp
@@ -3,6 +3,9 @@
 
 #include <cstdint>
 
+#define VERSION_CHALLENGE_LEN   16
+#define VERSION_CHECKSUM_LEN    20
+
 enum LOGIN_RESULT {
     LOGIN_OK                        = 0,
     LOGIN_INVALID_CHALLENGE_MESSAGE = 1,
diff --git a/src/net/grunt/ClientLink.cpp b/src/net/grunt/ClientLink.cpp
index 459aecd..6949c47 100644
--- a/src/net/grunt/ClientLink.cpp
+++ b/src/net/grunt/ClientLink.cpp
@@ -2,7 +2,6 @@
 #include "net/connection/WowConnection.hpp"
 #include "net/grunt/ClientResponse.hpp"
 #include "net/grunt/Command.hpp"
-#include "net/grunt/Types.hpp"
 #include "net/srp/SRP6_Random.hpp"
 #include <common/MD5.hpp>
 #include <storm/Error.hpp>
@@ -115,13 +114,13 @@ int32_t Grunt::ClientLink::CmdAuthLogonChallenge(CDataStore& msg) {
     uint8_t* salt;
     uint8_t* versionChallenge;
 
-    if (!CanRead(msg, largeSafePrimeLen + SALT_LEN + GRUNT_VERSION_CHALLENGE_LEN)) {
+    if (!CanRead(msg, largeSafePrimeLen + SALT_LEN + VERSION_CHALLENGE_LEN)) {
         return 0;
     }
 
     msg.GetDataInSitu(reinterpret_cast<void*&>(largeSafePrime), largeSafePrimeLen);
     msg.GetDataInSitu(reinterpret_cast<void*&>(salt), SALT_LEN);
-    msg.GetDataInSitu(reinterpret_cast<void*&>(versionChallenge), GRUNT_VERSION_CHALLENGE_LEN);
+    msg.GetDataInSitu(reinterpret_cast<void*&>(versionChallenge), VERSION_CHALLENGE_LEN);
 
     uint8_t logonFlags;
 
@@ -354,7 +353,7 @@ int32_t Grunt::ClientLink::CmdAuthReconnectChallenge(CDataStore& msg) {
     // Reconnect challenge success (result == 0)
 
     msg.GetDataInSitu(reinterpret_cast<void*&>(reconnectKey), RECONNECT_KEY_LEN);
-    msg.GetDataInSitu(reinterpret_cast<void*&>(versionChallenge), GRUNT_VERSION_CHALLENGE_LEN);
+    msg.GetDataInSitu(reinterpret_cast<void*&>(versionChallenge), VERSION_CHALLENGE_LEN);
 
     if (!msg.IsValid()) {
         return 1;
@@ -636,7 +635,7 @@ void Grunt::ClientLink::ProveVersion(const uint8_t* versionChecksum) {
         SHA1_CONTEXT ctx;
         SHA1_Init(&ctx);
         SHA1_Update(&ctx, this->m_srpClient.clientPublicKey, sizeof(this->m_srpClient.clientPublicKey));
-        SHA1_Update(&ctx, versionChecksum, GRUNT_VERSION_CHECKSUM_LEN);
+        SHA1_Update(&ctx, versionChecksum, VERSION_CHECKSUM_LEN);
         SHA1_Final(versionProof, &ctx);
         command.PutData(versionProof, sizeof(versionProof));
 
@@ -685,7 +684,7 @@ void Grunt::ClientLink::ProveVersion(const uint8_t* versionChecksum) {
 
         SHA1_Init(&sha1);
         SHA1_Update(&sha1, clientSalt, sizeof(clientSalt));
-        SHA1_Update(&sha1, versionChecksum, GRUNT_VERSION_CHECKSUM_LEN);
+        SHA1_Update(&sha1, versionChecksum, VERSION_CHECKSUM_LEN);
         SHA1_Final(clientChecksum, &sha1);
 
         command.PutData(clientChecksum, sizeof(clientChecksum));
diff --git a/src/net/grunt/ClientResponse.hpp b/src/net/grunt/ClientResponse.hpp
index e8241f4..3ccd6e2 100644
--- a/src/net/grunt/ClientResponse.hpp
+++ b/src/net/grunt/ClientResponse.hpp
@@ -21,6 +21,7 @@ class Grunt::ClientResponse {
         virtual void RealmListResult(CDataStore* msg) = 0;
         virtual LOGIN_STATE NextSecurityState(LOGIN_STATE state) = 0;
         virtual int32_t GetServerId() = 0;
+        virtual const uint8_t* GetVersionChallenge() = 0;
         virtual void GetRealmList() = 0;
         virtual void Logon(const char* a2, const char* a3) = 0;
         virtual void ProveVersion(const uint8_t* versionChecksum) = 0;
diff --git a/src/net/grunt/Types.hpp b/src/net/grunt/Types.hpp
index b8c7310..5f7c0e1 100644
--- a/src/net/grunt/Types.hpp
+++ b/src/net/grunt/Types.hpp
@@ -1,7 +1,4 @@
 #ifndef NET_GRUNT_TYPES_HPP
 #define NET_GRUNT_TYPES_HPP
 
-#define GRUNT_VERSION_CHALLENGE_LEN     16
-#define GRUNT_VERSION_CHECKSUM_LEN      20
-
 #endif
diff --git a/src/net/login/GruntLogin.cpp b/src/net/login/GruntLogin.cpp
index 93dffc0..dd9a5ee 100644
--- a/src/net/login/GruntLogin.cpp
+++ b/src/net/login/GruntLogin.cpp
@@ -89,6 +89,10 @@ int32_t GruntLogin::GetServerId() {
     return 0;
 }
 
+const uint8_t* GruntLogin::GetVersionChallenge() {
+    return this->m_versionChallenge;
+}
+
 void GruntLogin::GetVersionProof(const uint8_t* versionChallenge) {
     if (this->IsReconnect()) {
         // TODO
diff --git a/src/net/login/GruntLogin.hpp b/src/net/login/GruntLogin.hpp
index 012c701..a7fc43f 100644
--- a/src/net/login/GruntLogin.hpp
+++ b/src/net/login/GruntLogin.hpp
@@ -3,13 +3,13 @@
 
 #include "net/grunt/ClientResponse.hpp"
 #include "net/grunt/Grunt.hpp"
-#include "net/grunt/Types.hpp"
 #include "net/login/Login.hpp"
+#include "net/Types.hpp"
 
 class GruntLogin : public Login {
     public:
         // Member variables
-        uint8_t m_versionChallenge[GRUNT_VERSION_CHALLENGE_LEN];
+        uint8_t m_versionChallenge[VERSION_CHALLENGE_LEN];
         Grunt::ClientLink* m_clientLink = nullptr;
 
         // Virtual member functions
@@ -24,6 +24,7 @@ class GruntLogin : public Login {
         virtual void ReconnectResult(Grunt::Result result, const uint8_t* sessionKey, uint32_t sessionKeyLen, uint16_t flags);
         virtual LOGIN_STATE NextSecurityState(LOGIN_STATE state);
         virtual int32_t GetServerId();
+        virtual const uint8_t* GetVersionChallenge();
         virtual void GetRealmList();
         virtual void Logon(const char* a2, const char* a3);
         virtual void ProveVersion(const uint8_t* versionChecksum);