Add Arc4 cipher class draft implementation

ChaosTests/Cipher/Arc4CryptTests.cpp

@@ -0,0 +1,65 @@
+#include <gtest/gtest.h>
+#include <vector>
+#include <string>
+
+#include "Cipher/Arc4/Arc4Crypt.hpp"
+
+using namespace Chaos::Cipher::Arc4;
+
+static std::vector<uint8_t> StrToU8Vec(const char * str)
+{
+    std::vector<uint8_t> result;
+    result.reserve(strlen(str));
+
+    for (; *str != '\0'; ++str)
+    {
+        result.push_back(static_cast<uint8_t>(*str));
+    }
+
+    return result;
+}
+
+static std::string U8VecToStr(const std::vector<uint8_t> & vec)
+{
+    std::string result;
+    result.reserve(vec.size());
+
+    for (auto it = vec.begin(); it != vec.end(); ++it)
+    {
+        result.push_back(static_cast<char>(*it));
+    }
+
+    return result;
+}
+
+TEST(Arc4CryptTests, BasicTest)
+{
+    const std::vector<uint8_t> key = StrToU8Vec("Secret");
+    const std::vector<uint8_t> data = StrToU8Vec("Attack at dawn");
+
+    std::vector<uint8_t> ciphertext;
+    ciphertext.resize(data.size());
+
+    {
+        Arc4Crypt arc4;
+        arc4.Rekey(key.begin(), key.end());
+
+        arc4.Encrypt(ciphertext.begin(), data.begin(), data.size());
+    }
+
+    ASSERT_EQ(std::vector<uint8_t>({ 0x45, 0xA0, 0x1F, 0x64, 0x5F, 0xC3, 0x5B,
+                                     0x38, 0x35, 0x52, 0x54, 0x4B, 0x9B, 0xF5 }),
+              ciphertext);
+
+    std::vector<uint8_t> recoveredData;
+    recoveredData.resize(data.size());
+
+    {
+        Arc4Crypt arc4;
+        arc4.Rekey(key.begin(), key.end());
+
+        arc4.Decrypt(recoveredData.begin(), ciphertext.begin(), ciphertext.size());
+    }
+
+    ASSERT_EQ(data, recoveredData);
+}