From d342a45d98c4795b3a3fe1aaef5236ad4a782b55 Mon Sep 17 00:00:00 2001
From: Yuuta Liang <yuutaw@students.cs.ubc.ca>
Date: Thu, 12 Oct 2023 12:10:33 +0800
Subject: 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>
---
 src/main/model/x501/Name.java | 79 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/main/model/x501/Name.java

(limited to 'src/main/model/x501/Name.java')

diff --git a/src/main/model/x501/Name.java b/src/main/model/x501/Name.java
new file mode 100644
index 0000000..dd2acb6
--- /dev/null
+++ b/src/main/model/x501/Name.java
@@ -0,0 +1,79 @@
+package model.x501;
+
+import model.asn1.ASN1Object;
+import model.asn1.Encodable;
+import model.asn1.Tag;
+import model.asn1.exceptions.ParseException;
+import model.asn1.parsing.BytesReader;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+/**
+ * Represents an X.501 directory Name (a.k.a. RDNSequence).
+ * <pre>
+ *     Name ::= CHOICE { -- only one possibility for now -- rdnSequence RDNSequence }
+ *     RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
+ *     DistinguishedName ::= RDNSequence
+ * </pre>
+ */
+public class Name extends ASN1Object {
+    private final RelativeDistinguishedName[] rdnSequence;
+
+    /**
+     * EFFECT: Initialize the Name with the given tags and rdnSequence. For tag and parentTag, consult
+     * {@link ASN1Object}.
+     * REQUIRES: Items should have SET tag.
+     */
+    public Name(Tag tag, Tag parentTag, RelativeDistinguishedName[] rdnSequence) {
+        super(tag, parentTag);
+        this.rdnSequence = rdnSequence;
+    }
+
+    /**
+     * EFFECT: Parse the Name from input DER bytes. For details on parsing, refer to {@link ASN1Object}.
+     *   Throws {@link ParseException} for invalid input.
+     * MODIFIES: this, encoded
+     */
+    public Name(BytesReader encoded, boolean hasParentTag) throws ParseException {
+        super(encoded, hasParentTag);
+        final List<RelativeDistinguishedName> list = new ArrayList<>();
+        for (int i = 0; i < getLength();) {
+            int index = encoded.getIndex();
+            final RelativeDistinguishedName name = new RelativeDistinguishedName(encoded, false);
+            name.getTag().enforce(TAG_SET);
+            list.add(name);
+            index = encoded.getIndex() - index;
+            i += index;
+        }
+        this.rdnSequence = list.toArray(new RelativeDistinguishedName[0]);
+    }
+
+    /**
+     * EFFECTS: Encode the SEQUENCE OF into DER, keep order. RDNs will be encoded one-by-one.
+     */
+    @Override
+    public Byte[] encodeValueDER() {
+        return Stream.of(rdnSequence)
+                .map(Encodable::encodeDER)
+                .flatMap(Arrays::stream)
+                .toArray(Byte[]::new);
+    }
+
+    /**
+     * EFFECT: Convert the name into directory string, like CN=yuuta,OU=users,DC=yuuta,DC=moe
+     */
+    @Override
+    public String toString() {
+        return Stream.of(rdnSequence)
+                .map(RelativeDistinguishedName::toString)
+                .collect(Collectors.joining(","));
+    }
+
+    public RelativeDistinguishedName[] getRdnSequence() {
+        return rdnSequence;
+    }
+}
-- 
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