M meson.build → meson.build

@@ -98,15 +98,16 @@ dependencies: test_dep,
             install: false
         )
     )
-    test(
-        'x25519_tests',
-        executable(
-            'x25519_tests',
-            x25519_test_sources,
-            include_directories: incdir,
-            link_with: target,
-            dependencies: test_dep,
-            install: false
-        )
-    )
+    # Not included by default because it takes ~256 seconds to execute (includes a million-repetition test case)
+    # test(
+    #     'x25519_tests',
+    #     executable(
+    #         'x25519_tests',
+    #         x25519_test_sources,
+    #         include_directories: incdir,
+    #         link_with: target,
+    #         dependencies: test_dep,
+    #         install: false
+    #     )
+    # )
 endif

M tests/src/x25519/all.cpp → tests/src/x25519/all.cpp

@@ -42,4 +42,78 @@ 0xa1, 0x52, 0xe6, 0xf8, 0xf7, 0x64, 0x7a, 0xac, 0x79, 0x57 };
   uint8_t actual[sizeof (EXPECTED)];
   tct_x25519 (SCALAR, U, actual);
   EXPECT_EQ (memcmp (actual, EXPECTED, sizeof (EXPECTED)), 0);
+}
+
+TEST (X25519, x25519_repetition_1)
+{
+  uint8_t buf[96];
+  uint8_t *k = buf;
+  uint8_t *u = buf + 32;
+  uint8_t *out = buf + 64;
+  for (unsigned int i = 0; i < 32; ++i)
+    {
+      k[i] = u[i] = 0x0;
+    }
+  k[0] = 0x9;
+  u[0] = 0x9;
+  tct_x25519 (k, u, out);
+  const uint8_t EXPECTED[]
+      = { 0x42, 0x2c, 0x8e, 0x7a, 0x62, 0x27, 0xd7, 0xbc, 0xa1, 0x35, 0x0b,
+          0x3e, 0x2b, 0xb7, 0x27, 0x9f, 0x78, 0x97, 0xb8, 0x7b, 0xb6, 0x85,
+          0x4b, 0x78, 0x3c, 0x60, 0xe8, 0x03, 0x11, 0xae, 0x30, 0x79 };
+  EXPECT_EQ (memcmp (out, EXPECTED, sizeof (EXPECTED)), 0);
+}
+
+TEST (X25519, x25519_repetition_1000)
+{
+  uint8_t buf[96];
+  uint8_t *k = buf;
+  uint8_t *u = buf + 32;
+  uint8_t *out = buf + 64;
+  for (unsigned int i = 0; i < 32; ++i)
+    {
+      k[i] = u[i] = 0x0;
+    }
+  k[0] = 0x9;
+  u[0] = 0x9;
+  for (unsigned int i = 0; i < 1000; ++i)
+    {
+      tct_x25519 (k, u, out);
+      uint8_t *tmp = k;
+      k = out;
+      out = u;
+      u = tmp;
+    }
+  const uint8_t EXPECTED[]
+      = { 0x68, 0x4c, 0xf5, 0x9b, 0xa8, 0x33, 0x09, 0x55, 0x28, 0x00, 0xef,
+          0x56, 0x6f, 0x2f, 0x4d, 0x3c, 0x1c, 0x38, 0x87, 0xc4, 0x93, 0x60,
+          0xe3, 0x87, 0x5f, 0x2e, 0xb9, 0x4d, 0x99, 0x53, 0x2c, 0x51 };
+  EXPECT_EQ (memcmp (k, EXPECTED, sizeof (EXPECTED)), 0);
+}
+
+TEST (X25519, x25519_repetition_1000000)
+{
+  uint8_t buf[96];
+  uint8_t *k = buf;
+  uint8_t *u = buf + 32;
+  uint8_t *out = buf + 64;
+  for (unsigned int i = 0; i < 32; ++i)
+    {
+      k[i] = u[i] = 0x0;
+    }
+  k[0] = 0x9;
+  u[0] = 0x9;
+  for (unsigned int i = 0; i < 1000000; ++i)
+    {
+      tct_x25519 (k, u, out);
+      uint8_t *tmp = k;
+      k = out;
+      out = u;
+      u = tmp;
+    }
+  const uint8_t EXPECTED[]
+      = { 0x7c, 0x39, 0x11, 0xe0, 0xab, 0x25, 0x86, 0xfd, 0x86, 0x44, 0x97,
+          0x29, 0x7e, 0x57, 0x5e, 0x6f, 0x3b, 0xc6, 0x01, 0xc0, 0x88, 0x3c,
+          0x30, 0xdf, 0x5f, 0x4d, 0xd2, 0xd2, 0x4f, 0x66, 0x54, 0x24 };
+  EXPECT_EQ (memcmp (k, EXPECTED, sizeof (EXPECTED)), 0);
 }