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package model.asn1;
import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;
import ui.Utils;
import java.math.BigInteger;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Represents an X.680 OID, which is a global-unique multi-component int value (with a registry managing all OIDs).
*/
public class ObjectIdentifier extends ASN1Object {
/**
* The X.680 universal class tag assignment.
*/
public static final Tag TAG = new Tag(TagClass.UNIVERSAL, false, 0x6);
public static final Integer[] OID_CN = new Integer[]{2, 5, 4, 3};
public static final Integer[] OID_SN = new Integer[]{2, 5, 4, 4};
public static final Integer[] OID_C = new Integer[]{2, 5, 4, 6};
public static final Integer[] OID_L = new Integer[]{2, 5, 4, 7};
public static final Integer[] OID_O = new Integer[]{2, 5, 4, 10};
public static final Integer[] OID_OU = new Integer[]{2, 5, 4, 11};
public static final Integer[] OID_DC = new Integer[]{0, 9, 2342, 19200300, 100, 1, 25};
public static final Integer[] OID_EXTENSION_REQUEST =
new Integer[]{1, 2, 840, 113549, 1, 9, 14};
public static final Integer[] OID_RSA_ENCRYPTION =
new Integer[]{1, 2, 840, 113549, 1, 1, 1};
public static final Integer[] OID_SHA256_WITH_RSA_ENCRYPTION =
new Integer[]{1, 2, 840, 113549, 1, 1, 11};
public static final Integer[] OID_EC_PUBLIC_KEY =
new Integer[]{1, 2, 840, 10045, 2, 1};
public static final Integer[] OID_ECDSA_WITH_SHA256 =
new Integer[]{1, 2, 840, 10045, 4, 3, 2};
public static final Integer[] OID_ECDSA_WITH_SHA512 =
new Integer[]{1, 2, 840, 10045, 4, 3, 4};
public static final Integer[] OID_PRIME256_V1 =
new Integer[]{1, 2, 840, 10045, 3, 1, 7};
public static final Integer[] OID_SUBJECT_KEY_IDENTIFIER =
new Integer[]{2, 5, 29, 14};
public static final Integer[] OID_KEY_USAGE =
new Integer[]{2, 5, 29, 15};
public static final Integer[] OID_BASIC_CONSTRAINTS =
new Integer[]{2, 5, 29, 19};
public static final Integer[] OID_AUTHORITY_KEY_IDENTIFIER =
new Integer[]{2, 5, 29, 35};
public static final Integer[] OID_CRL_DISTRIBUTION_POINTS =
new Integer[]{2, 5, 29, 31};
public static final Integer[] OID_AUTHORITY_INFO_ACCESS =
new Integer[]{1, 3, 6, 1, 5, 5, 7, 1, 1};
public static final Integer[] OID_CURVED_25519 =
new Integer[]{1, 3, 101, 112};
public static final Integer[] OID_CRL_REASON =
new Integer[]{2, 5, 29, 21};
private final Integer[] ints;
/**
* EFFECTS: Construct the OID object with the given array of OID numbers. For the tag and parentTag,
* consult {@link ASN1Object}.
* REQUIRES: The ints array must have at least two elements, and the first element must be 0, 1, or 2.
* If the first element is 0 or 1, the second element must be < 40. For the tag and parentTag,
* consult {@link ASN1Object}.
*/
public ObjectIdentifier(Tag tag, Tag parentTag, Integer[] ints) {
super(tag, parentTag);
this.ints = ints;
}
/**
* EFFECTS: Parse the input DER.
* Throws {@link ParseException} if the input is invalid:
* - Zero bytes long
* - A multibyte integer is unterminated until the end of input
*/
public ObjectIdentifier(BytesReader encoded, boolean hasParentTag) throws ParseException {
super(encoded, hasParentTag);
if (getLength() < 1) {
throw new ParseException("Invalid OID");
}
List<Integer> nums = new ArrayList<>();
final Byte[] raw = encoded.require(getLength(), true);
Byte first = raw[0];
if (first >= 80) {
nums.add(2);
nums.add(first - 80);
} else if (first >= 40) {
nums.add(1);
nums.add(first - 40);
} else {
nums.add(0);
nums.add((int) first);
}
nums.addAll(parse(raw));
this.ints = nums.toArray(new Integer[0]);
}
/**
* EFFECTS: Get OID from a known part, case insensitive. Currently known: C CN OU O L DC.
* Throws {@link ParseException} if the name is unsupported.
*/
public static Integer[] getKnown(String name) throws ParseException {
switch (name.toUpperCase()) {
case "C": return OID_C;
case "CN": return OID_CN;
case "OU": return OID_OU;
case "O": return OID_O;
case "L": return OID_L;
case "DC": return OID_DC;
default: throw new ParseException("Unsupported DN part: " + name);
}
}
/**
* EFFECTS: Parse input OID bytes.
* REQUIRES: raw.length >= 1
*/
private static List<Integer> parse(Byte[] raw) throws ParseException {
List<Integer> nums = new ArrayList<>();
List<BitSet> num = new ArrayList<>();
for (int i = 1; i < raw.length; i++) {
Byte b = raw[i];
num.add(BitSet.valueOf(new byte[]{(byte) (b & 127)}));
if ((b & -128) == 0) {
BitSet bitSet = new BitSet(num.size() * 7);
int z = 0;
for (int j = num.size() - 1; j >= 0; j--) {
for (int k = 0; k < 7; k++) {
bitSet.set(z++, num.get(j).get(k));
}
}
List<Byte> bs1 = Arrays.asList(Utils.byteToByte(bitSet.toByteArray()));
Collections.reverse(bs1);
nums.add(new BigInteger(Utils.byteToByte(bs1.toArray(new Byte[0]))).intValueExact());
num.clear();
}
}
if (!num.isEmpty()) {
throw new ParseException("Unterminated byte.");
}
return nums;
}
/**
* EFFECTS: Generate a human-readable output of that OID, in the format of 0.1.2. In case of a well-known OID, its
* name is returned.
*/
@Override
public String toString() {
if (Arrays.equals(ints, OID_CN)) {
return "CN";
} else if (Arrays.equals(ints, OID_SN)) {
return "SN";
} else if (Arrays.equals(ints, OID_C)) {
return "C";
} else if (Arrays.equals(ints, OID_L)) {
return "L";
} else if (Arrays.equals(ints, OID_O)) {
return "O";
} else if (Arrays.equals(ints, OID_OU)) {
return "OU";
} else if (Arrays.equals(ints, OID_DC)) {
return "DC";
}
return Arrays.stream(ints)
.map(i -> Integer.toString(i))
.collect(Collectors.joining("."));
}
/**
* EFFECTS: Encode the OID into DER bytes, following the DER rules as follows:
* - First two ints: first * 40 + second
* - Remaining: Int components are encoded as-is if they are <= 127. Otherwise, they are encoded into multiple 7bit
* bytes, with the MSB set on every byte except for the last (rightmost byte) of each component.
* - Integers are in big-endian.
*/
@Override
public Byte[] encodeValueDER() {
return Stream.of(
Arrays.asList(Utils.valToByte(ints[0] * 40 + ints[1])),
Stream.of(ints)
.skip(2)
.map(ObjectIdentifier::encodeSingleInt)
.flatMap(Collection::stream)
.collect(Collectors.toList())
).flatMap(Collection::stream)
.toArray(Byte[]::new);
}
/**
* EFFECTS: Encode a single int component into OID-format bytes.
*/
private static List<Byte> encodeSingleInt(int i) {
BigInteger bi = BigInteger.valueOf(i);
List<Byte> bs = Arrays.asList(Utils.byteToByte(bi.toByteArray()));
Collections.reverse(bs);
final BitSet bitSetOriginal = BitSet.valueOf(Utils.byteToByte(bs.toArray(new Byte[0])));
BitSet bitSet = new BitSet(bs.size() * 16);
int k = 0;
for (int j = 0; j < bs.size() * 8; j++) {
if (j == 0 || j % 7 != 0) {
bitSet.set(k++, bitSetOriginal.get(j));
} else {
bitSet.set(k++, j != 7);
bitSet.set(k++, bitSetOriginal.get(j));
}
}
byte[] bs1 = bitSet.toByteArray();
List<Byte> res =
Arrays.asList(Utils.byteToByte(bs1));
Collections.reverse(res);
return res;
}
public Integer[] getInts() {
return ints;
}
}
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