Add known answer test for AsconCXOF-128

Signed-off-by: Anjan Roy <[email protected]>

tests/kat_ascon_cxof128.cpp

@@ -0,0 +1,55 @@
+#include "ascon/hashes/ascon_cxof128.hpp"
+#include "test_helper.hpp"
+#include <fstream>
+#include <gtest/gtest.h>
+
+TEST(AsconCXOF128, KnownAnswerTests)
+{
+  using namespace std::literals;
+
+  const std::string kat_file = "./kats/ascon_cxof128.kat";
+  std::fstream file(kat_file);
+
+  while (true) {
+    std::string count0;
+
+    if (!std::getline(file, count0).eof()) {
+      std::string msg0;
+      std::string customization_str0;
+      std::string md0;
+
+      std::getline(file, msg0);
+      std::getline(file, customization_str0);
+      std::getline(file, md0);
+
+      auto msg1 = std::string_view(msg0);
+      auto customization_str1 = std::string_view(customization_str0);
+      auto md1 = std::string_view(md0);
+
+      auto msg2 = msg1.substr(msg1.find("="sv) + 2, msg1.size());
+      auto customization_str2 = customization_str1.substr(customization_str1.find("="sv) + 2, customization_str1.size());
+      auto md2 = md1.substr(md1.find("="sv) + 2, md1.size());
+
+      auto msg = hex_to_bytes(msg2);
+      auto customization_str = hex_to_bytes(customization_str2);
+      auto md = hex_to_bytes(md2);
+
+      std::vector<uint8_t> computed_md(md.size());
+
+      ascon_cxof128::ascon_cxof128_t hasher;
+      EXPECT_TRUE(hasher.customize(customization_str));
+      EXPECT_TRUE(hasher.absorb(msg));
+      EXPECT_TRUE(hasher.finalize());
+      EXPECT_TRUE(hasher.squeeze(computed_md));
+
+      EXPECT_EQ(computed_md, md);
+
+      std::string empty_line;
+      std::getline(file, empty_line);
+    } else {
+      break;
+    }
+  }
+
+  file.close();
+}