Add HMAC as per RFC 2104 draft implementation

ChaosTests/HmacTests.cpp

@@ -0,0 +1,52 @@
+#include <gtest/gtest.h>
+
+#include "Hash/Md5.hpp"
+#include "Mac/Hmac.hpp"
+
+using namespace Chaos::Mac::Hmac;
+using namespace Chaos::Hash::Md5;
+
+TEST(HmacTests, RFCTest)
+{
+    struct Helper
+    {
+        std::string operator()(const char * key, const char * data) const
+        {
+            Hmac<Md5Hasher> hmac(key, key + strlen(key));
+            hmac.Update(data, data + strlen(data));
+            return hmac.Finish().ToHexString();
+        }
+    };
+
+    Helper hmacMd5;
+
+    {
+        const char * key = "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
+                           "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b";
+        const char * data = "Hi There";
+
+        ASSERT_EQ("9294727a3638bb1c13f48ef8158bfc9d", hmacMd5(key, data));
+    }
+
+    {
+        const char * key = "Jefe";
+        const char * data = "what do ya want for nothing?";
+
+        ASSERT_EQ("750c783e6ab0b503eaa86e310a5db738", hmacMd5(key, data));
+    }
+
+    {
+        uint8_t key[] = { 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+                          0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa };
+        uint8_t data[] = { 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                           0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                           0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                           0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                           0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd };
+
+        Hmac<Md5Hasher> hmacMd5(key, key + std::size(key));
+        hmacMd5.Update(data, data + std::size(data));
+
+        ASSERT_EQ("56be34521d144c88dbb8c733f0e8b3f6", hmacMd5.Finish().ToHexString());
+    }
+}