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, 47 insertions, 0 deletions

diff --git a/src/main/model/asn1/OctetString.java b/src/main/model/asn1/OctetString.java
new file mode 100644
index 0000000..b552e52
--- /dev/null
+++ b/src/main/model/asn1/OctetString.java
@@ -0,0 +1,47 @@
+package model.asn1;
+
+import model.asn1.exceptions.ParseException;
+import model.asn1.parsing.BytesReader;
+
+/**
+ * Represents the ASN.1 OCTET STRING type. An OCTET STRING is just a sequence of bytes.
+ */
+public class OctetString extends ASN1Object {
+    /**
+     * The X.680 universal class tag assignment.
+     */
+    public static final Tag TAG = new Tag(TagClass.UNIVERSAL, false, 0x4);
+
+    private final Byte[] bytes;
+
+    /**
+     * EFFECTS: Initiate the OctetString object with the given bytes array. The byte array can be arbitrary.
+     * REQUIRES: For the requirements of tag and parentTag, consult {@link ASN1Object}.
+     */
+    public OctetString(Tag tag, Tag parentTag, Byte[] bytes) {
+        super(tag, parentTag);
+        this.bytes = bytes;
+    }
+
+    /**
+     * EFFECTS: Parse tags and value from user input. Tags are parsed as-per {@link ASN1Object}.
+     * Throws {@link ParseException} if the encoded data is invalid, see {@link ASN1Object}.
+     * MODIFIES: this, encoded
+     */
+    public OctetString(BytesReader encoded, boolean hasParentTag) throws ParseException {
+        super(encoded, hasParentTag);
+        this.bytes = encoded.require(getLength(), true);
+    }
+
+    /**
+     * EFFECTS: Get the value bytes ready to encode into DER.
+     */
+    @Override
+    public Byte[] encodeValueDER() {
+        return bytes;
+    }
+
+    public Byte[] getBytes() {
+        return bytes;
+    }
+}
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