1 files changed, 51 insertions, 0 deletions
diff --git a/rlz/lib/crc8_unittest.cc b/rlz/lib/crc8_unittest.cc
new file mode 100644
index 0000000..4889242
--- /dev/null
+++ b/rlz/lib/crc8_unittest.cc
@@ -0,0 +1,51 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Uniitest for data encryption functions.
+
+#include "base/logging.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "rlz/lib/crc8.h"
+
+TEST(Crc8Unittest, TestCrc8) {
+  struct Data {
+    char string[10];
+    // Externally calculated checksums use
+    // http://www.zorc.breitbandkatze.de/crc.html
+    // with the ATM HEC paramters:
+    // CRC-8, Polynomial 0x07, Initial value 0x00, Final XOR value 0x55
+    // (direct, don't reverse data byes, don't reverse CRC before final XOR)
+    unsigned char external_crc;
+    int random_byte;
+    unsigned char corrupt_value;
+  } data[] = {
+    {"Google",    0x01, 2, 0x53},
+    {"GOOGLE",    0xA6, 4, 0x11},
+    {"My CRC 8!", 0xDC, 0, 0x50},
+  };
+
+  unsigned char* bytes;
+  unsigned char crc;
+  bool matches;
+  int length;
+  for (size_t i = 0; i < sizeof(data) / sizeof(data[0]); ++i) {
+    bytes = reinterpret_cast<unsigned char*>(data[i].string);
+    crc = 0;
+    matches = false;
+    length = strlen(data[i].string);
+
+    // Calculate CRC and compare against external value.
+    rlz_lib::Crc8::Generate(bytes, length, &crc);
+    EXPECT_TRUE(crc == data[i].external_crc);
+    rlz_lib::Crc8::Verify(bytes, length, crc, &matches);
+    EXPECT_TRUE(matches);
+
+    // Corrupt string and see if CRC still matches.
+    data[i].string[data[i].random_byte] = data[i].corrupt_value;
+    rlz_lib::Crc8::Verify(bytes, length, crc, &matches);
+    EXPECT_FALSE(matches);
+  }
+}