Implement data structures from X.680, X.501, X.509, and PKCS#10, with X.690 encoding / decoding support

The implementation took four days, and it is still a little bit rough. Updated version should arrive soon.

Signed-off-by: Yuuta Liang <yuutaw@students.cs.ubc.ca>

1 files changed, 75 insertions, 0 deletions

diff --git a/src/test/model/asn1/BitStringTest.java b/src/test/model/asn1/BitStringTest.java
new file mode 100644
index 0000000..c893b36
--- /dev/null
+++ b/src/test/model/asn1/BitStringTest.java
@@ -0,0 +1,75 @@
+package model.asn1;
+
+import model.asn1.exceptions.ParseException;
+import model.asn1.parsing.BytesReader;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class BitStringTest {
+    @Test
+    void testConstructor() {
+        assertArrayEquals(new Byte[]{ 0x2, 0x3 },
+                new BitString(BitString.TAG, null, 0, new Byte[]{ 0x2, 0x3 })
+                        .getVal());
+        assertEquals(3,
+                new BitString(BitString.TAG, null, 3, new Byte[]{ 0x2, 0x8 })
+                        .getUnused());
+    }
+
+    @Test
+    void testConvert() {
+        // 00000010 00001000
+        // 00000000 01000001 = 65
+        assertArrayEquals(new Byte[]{ 65 },
+                new BitString(BitString.TAG, null, 3, new Byte[]{ 0x2, 0x8 })
+                        .getConvertedVal());
+
+        assertArrayEquals(new Byte[]{ 0x2, 0x8 },
+                new BitString(BitString.TAG, null, 0, new Byte[]{ 0x2, 0x8 })
+                        .getConvertedVal());
+    }
+
+    @Test
+    void testParse() throws ParseException {
+        assertArrayEquals(new Byte[]{ 0x6e, 0x5d, -64 },
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x06, 0x6e, 0x5d, -64 }), false)
+                        .getVal());
+        assertEquals(6,
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x06, 0x6e, 0x5d, -64 }), false)
+                        .getUnused());
+        assertArrayEquals(new Byte[]{ 0x01, -71, 0x77 },
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x06, 0x6e, 0x5d, -64 }), false)
+                        .getConvertedVal());
+    }
+
+    @Test
+    void testParseFail() {
+        assertThrows(ParseException.class, () ->
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04 }), false));
+        // 0b11100000
+        assertThrows(ParseException.class, () ->
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x06, 0x6e, 0x5d, -32 }), false));
+        // 0b11000001
+        assertThrows(ParseException.class, () ->
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x06, 0x6e, 0x5d, -63 }), false));
+        // Unused bits = 8
+        assertThrows(ParseException.class, () ->
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x08, 0x6e, 0x5d, -64 }), false));
+        // Unused bits = 6 -> 7
+        assertThrows(ParseException.class, () ->
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x07, 0x6e, 0x5d, -64 }), false));
+        // Illegal unused bits: 8 and -1
+        assertThrows(ParseException.class, () ->
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x08, 0x6e, 0x5d, -64 }), false));
+        assertThrows(ParseException.class, () ->
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, -1, 0x6e, 0x5d, -64 }), false));
+    }
+
+    @Test
+    void testEncode() throws ParseException {
+        assertArrayEquals(new Byte[]{ 0x03, 0x04, 0x06, 0x6e, 0x5d, -64 },
+                new BitString(new BytesReader(new Byte[]{ 0x03, 0x04, 0x06, 0x6e, 0x5d, -64 }), false)
+                        .encodeDER());
+    }
+}