Add ISO/IEC 7816-4 padding implementation.

Chaos/Padding/PadderIso7816.hpp

@@ -0,0 +1,33 @@
+#ifndef CHAOS_PADDING_PADDERISO7816_HPP
+#define CHAOS_PADDING_PADDERISO7816_HPP
+
+#include <cstdint>
+
+#include "Padding/Padder.hpp"
+
+namespace Chaos::Padding
+{
+
+class PadderIso7816 : public Padder<PadderIso7816>
+{
+public:
+    template<typename OutputIt>
+    static void Pad(OutputIt begin, OutputIt end)
+    {
+        OutputIt it = begin;
+
+        if (it != end)
+        {
+            *it++ = static_cast<uint8_t>(0x80);
+
+            for (; it != end; ++it)
+            {
+                *it = 0;
+            }
+        }
+    }
+};
+
+} // namespace Chaos::Padding
+
+#endif // CHAOS_PADDING_PADDERISO7816_HPP

ChaosTests/CMakeLists.txt

@@ -19,6 +19,7 @@ set(ChaosTests_SOURCE Hash/Md4HasherTests.cpp
                       Cipher/Arc4CryptTests.cpp
                       Cipher/DesCryptTests.cpp
                       Padding/PadderPkcs7Tests.cpp
+                      Padding/PadderIso7816Tests.cpp
                       Service/SeArrayTests.cpp
                       Service/ChaosExceptionTests.cpp)
 

ChaosTests/Padding/PadderIso7816Tests.cpp

@@ -0,0 +1,131 @@
+#include <gtest/gtest.h>
+#include <array>
+#include <cstdint>
+#include <vector>
+
+#include "Padding/PadderIso7816.hpp"
+
+using namespace Chaos::Padding;
+
+TEST(PadIso7816Tests, PadTest)
+{
+    {
+        std::array<uint8_t, 1> fact = {};
+        std::array<uint8_t, 1> expected = { 0x80 };
+
+        PadderIso7816::Pad(fact.begin(), fact.end());
+        ASSERT_EQ(expected, fact);
+    }
+
+    {
+        std::array<uint8_t, 7> fact = {};
+        std::array<uint8_t, 7> expected =
+        {
+           0x80, 0x00, 0x00, 0x00, 0x00,
+           0x00, 0x00
+        };
+
+        PadderIso7816::Pad(fact.begin(), fact.end());
+        ASSERT_EQ(expected, fact);
+    }
+
+    {
+        std::array<uint8_t, 10> fact = {};
+        std::array<uint8_t, 10> expected =
+        {
+           0x80, 0x00, 0x00, 0x00, 0x00,
+           0x00, 0x00, 0x00, 0x00, 0x00
+        };
+
+        PadderIso7816::Pad(fact.begin(), fact.end());
+        ASSERT_EQ(expected, fact);
+    }
+
+    for (int i = 0; i < 256; ++i)
+    {
+        std::vector<uint8_t> fact(i, 0xff);
+
+        PadderIso7816::Pad(fact.begin(), fact.end());
+
+        for (int j = 0; j < i; ++j)
+        {
+            ASSERT_EQ(j == 0 ? 0x80 : 0x00, fact[j]);
+        }
+    }
+}
+
+TEST(PadIso7816Tests, PadOutIteratorUsageTest)
+{
+    {
+        std::array<uint8_t, 28> fact;
+        fact.fill(0xff);
+
+        std::array<uint8_t, 28> expected =
+        {
+            0xff, 0xff, 0xff,
+            0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0xff, 0xff, 0xff
+        };
+
+        PadderIso7816::Pad(fact.begin() + 3, fact.end() - 3);
+        ASSERT_EQ(expected, fact);
+    }
+
+    {
+        std::array<uint8_t, 39> fact;
+        fact.fill(0xff);
+
+        std::array<uint8_t, 39> expected =
+        {
+            0xff, 0xff, 0xff,
+            0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0xff, 0xff, 0xff
+        };
+
+        PadderIso7816::Pad(fact.begin() + 3, fact.end() - 3);
+        ASSERT_EQ(expected, fact);
+    }
+
+    {
+        std::array<uint8_t, 10> fact =
+        {
+            0xbb, 0xbb, 0xbb, 0xbb, 0xbb,
+            0xbb, 0xbb, 0xbb, 0xbb, 0xbb
+        };
+        std::array<uint8_t, 10> expected =
+        {
+            0xbb, 0xbb, 0xbb, 0xbb, 0xbb,
+            0xbb, 0xbb, 0xbb, 0xbb, 0xbb
+        };
+
+        PadderIso7816::Pad(fact.begin() + 5, fact.begin() + 5);
+        ASSERT_EQ(expected, fact);
+    }
+}
+
+template<typename Impl, typename OutputIt>
+void PadThroughBase(const Padder<Impl> & padder, OutputIt begin, OutputIt end)
+{
+    padder.Pad(begin, end);
+}
+
+TEST(PadIso7816Tests, PadThroughBaseTest)
+{
+    {
+        std::array<uint8_t, 5> fact;
+        fact.fill(0xff);
+
+        std::array<uint8_t, 5> expected =
+        {
+            0x80, 0x00, 0x00, 0x00, 0x00
+        };
+
+        const PadderIso7816 padder;
+        PadThroughBase(padder, fact.begin(), fact.end());
+
+        ASSERT_EQ(expected, fact);
+    }
+}