Implement DER encoding for BOOLEAN, INTEGER and UTF8String in Client

client/tests/der_tests.vala

@@ -0,0 +1,95 @@
+using StudySystemClient.Der;
+
+static bool bytes_equal(uint8[] expected, uint8[] actual)
+{
+	if (expected.length != actual.length)
+		return false;
+	return Memory.cmp(expected, actual, expected.length) == 0;
+}
+
+static string bytes_to_string(uint8[] bytes)
+{
+	var s = "";
+	foreach (var byte in bytes)
+		s += "%02x".printf(byte);
+	return s;
+}
+
+static void test_encode(Datum datum, uint8[] expected)
+{
+	var bytes = datum.encode();
+	if (!bytes_equal(expected, bytes)) {
+		Test.message("Encoding is incorrect: expected %s got %s",
+					 bytes_to_string(expected), bytes_to_string(bytes));
+		Test.fail();
+		return;
+	}
+}
+
+void main(string[] args) {
+	Test.init(ref args);
+
+	/*
+	 * Encoding
+	 */
+
+	Test.add_func("/encode/boolean/true", () => {
+			test_encode(new Boolean(true), {0x01, 0x01, 0xff});
+		});
+	Test.add_func("/encode/boolean/false", () => {
+			test_encode(new Boolean(false), {0x01, 0x01, 0x00});
+		});
+
+	Test.add_func("/encode/integer/small/0", () => {
+			test_encode(new Integer(0), {0x02, 0x01, 0x00});
+		});
+	Test.add_func("/encode/integer/small/5", () => {
+			test_encode(new Integer(5), {0x02, 0x01, 0x05});
+		});
+	Test.add_func("/encode/integer/small/42", () => {
+			test_encode(new Integer(42), {0x02, 0x01, 0x2a});
+		});
+	Test.add_func("/encode/integer/large/1337", () => {
+			test_encode(new Integer(1337), {0x02, 0x02, 0x05, 0x39});
+		});
+	Test.add_func("/encode/integer/sign/128", () => {
+			test_encode(new Integer(128), {0x02, 0x02, 0x00, 0x80});
+		});
+	Test.add_func("/encode/integer/sign/0xbeef", () => {
+			test_encode(new Integer(0xbeef), {0x02, 0x03, 0x00, 0xbe, 0xef});
+		});
+	Test.add_func("/encode/integer/sign/-128", () => {
+			test_encode(new Integer(-128), {0x02, 0x01, 0x80});
+		});
+	Test.add_func("/encode/integer/sign/-1337", () => {
+			test_encode(new Integer(-1337), {0x02, 0x02, 0xfa, 0xc7});
+		});
+
+	Test.add_func("/encode/utf8string/short/foo", () => {
+			test_encode(new Utf8String("foo"),
+						{0x0c, 0x03, 0x66, 0x6f, 0x6f});
+		});
+	Test.add_func("/encode/utf8string/short/bar", () => {
+			test_encode(new Utf8String("bar"),
+						{0x0c, 0x03, 0x62, 0x61, 0x72});
+		});
+	Test.add_func("/encode/utf8string/long/x300", () => {
+			var expected = new uint8[304];
+			expected[0] = 0x0c;
+			expected[1] = 0x82;
+			expected[2] = 0x01;
+			expected[3] = 0x2c;
+			Memory.set(expected[4:], 0x78, 300);
+			test_encode(new Utf8String(string.nfill(300, 'x')), expected);
+		});
+	Test.add_func("/encode/utf8string/long/x128", () => {
+			var expected = new uint8[131];
+			expected[0] = 0x0c;
+			expected[1] = 0x81;
+			expected[2] = 0x80;
+			Memory.set(expected[3:], 0x78, 128);
+			test_encode(new Utf8String(string.nfill(128, 'x')), expected);
+		});
+	
+	Test.run();
+}

client/tests/meson.build

@@ -0,0 +1,8 @@
+test(
+  'DER tests',
+  executable(
+    'der_tests',
+    'der_tests.vala',
+    dependencies: [lib_dep, gtk_dep]
+  )
+)