From 680c12a4bfc3dfb181ee8751365abf203fcbb56d Mon Sep 17 00:00:00 2001
From: Shauren <shauren.trinity@gmail.com>
Date: Sat, 19 Mar 2016 23:15:54 +0100
Subject: [PATCH] Core/Crypto: Renamed SHA1Randx/WardenKeyGeneration and made
 it a template class

---
 src/common/Cryptography/SHA1.h                |  3 ++
 src/common/Cryptography/SHA256.h              |  3 ++
 ...KeyGeneration.h => SessionKeyGeneration.h} | 37 ++++++++++---------
 src/server/game/Warden/WardenMac.cpp          |  4 +-
 src/server/game/Warden/WardenWin.cpp          |  4 +-
 5 files changed, 29 insertions(+), 22 deletions(-)
 rename src/common/Cryptography/{WardenKeyGeneration.h => SessionKeyGeneration.h} (63%)

diff --git a/src/common/Cryptography/SHA1.h b/src/common/Cryptography/SHA1.h
index ffa02176a2d..944350265f4 100644
--- a/src/common/Cryptography/SHA1.h
+++ b/src/common/Cryptography/SHA1.h
@@ -21,6 +21,7 @@
 
 #include "Define.h"
 #include <string>
+#include <type_traits>
 #include <openssl/sha.h>
 
 class BigNumber;
@@ -28,6 +29,8 @@ class BigNumber;
 class SHA1Hash
 {
     public:
+        typedef std::integral_constant<uint32, SHA_DIGEST_LENGTH> DigestLength;
+
         SHA1Hash();
         ~SHA1Hash();
 
diff --git a/src/common/Cryptography/SHA256.h b/src/common/Cryptography/SHA256.h
index d31c24ed93b..33f23f639a4 100644
--- a/src/common/Cryptography/SHA256.h
+++ b/src/common/Cryptography/SHA256.h
@@ -20,6 +20,7 @@
 
 #include "Define.h"
 #include <string>
+#include <type_traits>
 #include <openssl/sha.h>
 
 class BigNumber;
@@ -27,6 +28,8 @@ class BigNumber;
 class SHA256Hash
 {
     public:
+        typedef std::integral_constant<uint32, SHA256_DIGEST_LENGTH> DigestLength;
+
         SHA256Hash();
         ~SHA256Hash();
 
diff --git a/src/common/Cryptography/WardenKeyGeneration.h b/src/common/Cryptography/SessionKeyGeneration.h
similarity index 63%
rename from src/common/Cryptography/WardenKeyGeneration.h
rename to src/common/Cryptography/SessionKeyGeneration.h
index 18118ece649..0ec4479b765 100644
--- a/src/common/Cryptography/WardenKeyGeneration.h
+++ b/src/common/Cryptography/SessionKeyGeneration.h
@@ -16,17 +16,16 @@
  * with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "SHA1.h"
+#ifndef SessionKeyGeneration_h__
+#define SessionKeyGeneration_h__
 
-#include <cstring>
+#include "Common.h"
 
-#ifndef _WARDEN_KEY_GENERATION_H
-#define _WARDEN_KEY_GENERATION_H
-
-class SHA1Randx
+template<class Hash>
+class SessionKeyGenerator
 {
 public:
-    SHA1Randx(uint8* buff, uint32 size)
+    SessionKeyGenerator(uint8* buff, uint32 size)
     {
         uint32 halfSize = size / 2;
 
@@ -34,15 +33,15 @@ public:
         sh.UpdateData(buff, halfSize);
         sh.Finalize();
 
-        memcpy(o1, sh.GetDigest(), 20);
+        memcpy(o1, sh.GetDigest(), Hash::DigestLength::value);
 
         sh.Initialize();
         sh.UpdateData(buff + halfSize, size - halfSize);
         sh.Finalize();
 
-        memcpy(o2, sh.GetDigest(), 20);
+        memcpy(o2, sh.GetDigest(), Hash::DigestLength::value);
 
-        memset(o0, 0x00, 20);
+        memset(o0, 0x00, Hash::DigestLength::value);
 
         FillUp();
     }
@@ -51,7 +50,7 @@ public:
     {
         for (uint32 i = 0; i < sz; ++i)
         {
-            if (taken == 20)
+            if (taken == Hash::DigestLength::value)
                 FillUp();
 
             buf[i] = o0[taken];
@@ -63,19 +62,21 @@ private:
     void FillUp()
     {
         sh.Initialize();
-        sh.UpdateData(o1, 20);
-        sh.UpdateData(o0, 20);
-        sh.UpdateData(o2, 20);
+        sh.UpdateData(o1, Hash::DigestLength::value);
+        sh.UpdateData(o0, Hash::DigestLength::value);
+        sh.UpdateData(o2, Hash::DigestLength::value);
         sh.Finalize();
 
-        memcpy(o0, sh.GetDigest(), 20);
+        memcpy(o0, sh.GetDigest(), Hash::DigestLength::value);
 
         taken = 0;
     }
 
-    SHA1Hash sh;
+    Hash sh;
     uint32 taken;
-    uint8 o0[20], o1[20], o2[20];
+    uint8 o0[Hash::DigestLength::value];
+    uint8 o1[Hash::DigestLength::value];
+    uint8 o2[Hash::DigestLength::value];
 };
 
-#endif
+#endif // SessionKeyGeneration_h__
diff --git a/src/server/game/Warden/WardenMac.cpp b/src/server/game/Warden/WardenMac.cpp
index 6df1dc7561c..3c89792745b 100644
--- a/src/server/game/Warden/WardenMac.cpp
+++ b/src/server/game/Warden/WardenMac.cpp
@@ -16,7 +16,7 @@
  * with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "Cryptography/WardenKeyGeneration.h"
+#include "Cryptography/SessionKeyGeneration.h"
 #include "Common.h"
 #include "WorldPacket.h"
 #include "WorldSession.h"
@@ -39,7 +39,7 @@ void WardenMac::Init(WorldSession* pClient, BigNumber* K)
 {
     _session = pClient;
     // Generate Warden Key
-    SHA1Randx WK(K->AsByteArray().get(), K->GetNumBytes());
+    SessionKeyGenerator<SHA1Hash> WK(K->AsByteArray().get(), K->GetNumBytes());
     WK.Generate(_inputKey, 16);
     WK.Generate(_outputKey, 16);
     /*
diff --git a/src/server/game/Warden/WardenWin.cpp b/src/server/game/Warden/WardenWin.cpp
index b99a6cd3ac9..96857dd26d3 100644
--- a/src/server/game/Warden/WardenWin.cpp
+++ b/src/server/game/Warden/WardenWin.cpp
@@ -17,7 +17,7 @@
  */
 
 #include "Cryptography/HmacHash.h"
-#include "Cryptography/WardenKeyGeneration.h"
+#include "Cryptography/SessionKeyGeneration.h"
 #include "Common.h"
 #include "WorldPacket.h"
 #include "WorldSession.h"
@@ -42,7 +42,7 @@ void WardenWin::Init(WorldSession* session, BigNumber* k)
 {
     _session = session;
     // Generate Warden Key
-    SHA1Randx WK(k->AsByteArray().get(), k->GetNumBytes());
+    SessionKeyGenerator<SHA1Hash> WK(k->AsByteArray().get(), k->GetNumBytes());
     WK.Generate(_inputKey, 16);
     WK.Generate(_outputKey, 16);