org.apache.harmony.security.asn1.ObjectIdentifier Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Stepan M. Mishura
* @version $Revision$
*/
package org.apache.harmony.security.asn1;
import java.util.Arrays;
/**
* Instance of this class represents ObjectIdentifier (OID).
*
* According to X.690:
* OID is represented as a sequence of subidentifier.
* Each subidentifier is represented as non negative integer value.
* There are at least 2 subidentifiers in the sequence.
*
* Valid values for first subidentifier are 0, 1 and 2.
* If the first subidentifier has 0 or 1 value the second
* subidentifier must be less then 40.
*
* @see ASN.1
*/
public final class ObjectIdentifier {
/** OID as array of integers */
private final int[] oid;
/** OID as string */
private String soid;
/**
* Creates ObjectIdentifier(OID) from array of integers.
*
* @param oid array of integers
* @throws IllegalArgumentException if oid is invalid or null
*/
public ObjectIdentifier(int[] oid) {
validate(oid);
this.oid = oid;
}
/**
* Creates ObjectIdentifier(OID) from string representation.
*
* @param strOid oid string
* @throws IllegalArgumentException if oid string is invalid or null
*/
public ObjectIdentifier(String strOid) {
this.oid = toIntArray(strOid);
this.soid = strOid;
}
@Override public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || this.getClass() != o.getClass()) {
return false;
}
return Arrays.equals(oid, ((ObjectIdentifier) o).oid);
}
@Override public String toString() {
if (soid == null) {
soid = toString(oid);
}
return soid;
}
@Override public int hashCode() {
// FIXME change me to Arrays.hashCode(int[])
int intHash = 0;
for (int i = 0; i < oid.length && i < 4; i++) {
intHash += oid[i] << (8 * i); //TODO what about to find better one?
}
return intHash & 0x7FFFFFFF; // only positive
}
/**
* Validates ObjectIdentifier (OID).
*
* @param oid oid as array of integers
* @throws IllegalArgumentException if oid is invalid or null
*/
public static void validate(int[] oid) {
if (oid == null) {
throw new IllegalArgumentException("oid == null");
}
if (oid.length < 2) {
throw new IllegalArgumentException("OID MUST have at least 2 subidentifiers");
}
if (oid[0] > 2) {
throw new IllegalArgumentException(
"Valid values for first subidentifier are 0, 1 and 2");
} else if (oid[0] != 2 && oid[1] > 39) {
throw new IllegalArgumentException("If the first subidentifier has 0 or 1 value the "
+ "second subidentifier value MUST be less than 40");
}
for (int anOid : oid) {
if (anOid < 0) {
throw new IllegalArgumentException("Subidentifier MUST have positive value");
}
}
}
/**
* Returns string representation of OID.
*
* Note: it is supposed that passed array of integers
* contains valid OID value, so no checks are performed.
*
* @param oid oid as array of integers
* @return oid string representation
*/
public static String toString(int[] oid) {
StringBuilder sb = new StringBuilder(3 * oid.length);
for (int i = 0; i < oid.length - 1; ++i) {
sb.append(oid[i]);
sb.append('.');
}
sb.append(oid[oid.length - 1]);
return sb.toString();
}
/**
* Gets ObjectIdentifier (OID) from string representation.
*
* String representation is defined by the following syntax:
* OID = subidentifier 1*("." subidentifier)
* subidentifier = 1*(digit)
*
* @param str string representation of OID
* @return oid as array of integers
* @throws IllegalArgumentException if oid string is invalid or null
*/
public static int[] toIntArray(String str) {
return toIntArray(str, true);
}
/**
* Returns whether the given string is a valid ObjectIdentifier
* (OID) representation.
*
* String representation is defined as for {@link #toIntArray}.
*
* @param str string representation of OID
* @return true if oidString has valid syntax or false if not
*/
public static boolean isOID(String str) {
return toIntArray(str, false) != null;
}
/**
* Gets ObjectIdentifier (OID) from string representation.
*
* String representation is defined by the following syntax:
* OID = subidentifier 1*("." subidentifier)
* subidentifier = 1*(digit)
*
* @param str string representation of OID
* @return oid as array of integers or null if the oid string is
* invalid or null and shouldThrow is false
* @throws IllegalArgumentException if oid string is invalid or null and
* shouldThrow is true
*/
private static int[] toIntArray(String str, boolean shouldThrow) {
if (str == null) {
if (! shouldThrow) {
return null;
}
throw new IllegalArgumentException("str == null");
}
int length = str.length();
if (length == 0) {
if (! shouldThrow) {
return null;
}
throw new IllegalArgumentException("Incorrect syntax");
}
int count = 1; // number of subidentifiers
boolean wasDot = true; // indicates whether char before was dot or not.
char c; // current char
for (int i = 0; i < length; i++) {
c = str.charAt(i);
if (c == '.') {
if (wasDot) {
if (! shouldThrow) {
return null;
}
throw new IllegalArgumentException("Incorrect syntax");
}
wasDot = true;
count++;
} else if (c >= '0' && c <= '9') {
wasDot = false;
} else {
if (! shouldThrow) {
return null;
}
throw new IllegalArgumentException("Incorrect syntax");
}
}
if (wasDot) {
// the last char is dot
if (! shouldThrow) {
return null;
}
throw new IllegalArgumentException("Incorrect syntax");
}
if (count < 2) {
if (! shouldThrow) {
return null;
}
throw new IllegalArgumentException("Incorrect syntax");
}
int[] oid = new int[count];
for (int i = 0, j = 0; i < length; i++) {
c = str.charAt(i);
if (c == '.') {
j++;
} else {
oid[j] = oid[j] * 10 + c - 48; // '0' = 48
}
}
if (oid[0] > 2) {
if (! shouldThrow) {
return null;
}
throw new IllegalArgumentException("Incorrect syntax");
} else if (oid[0] != 2 && oid[1] > 39) {
if (! shouldThrow) {
return null;
}
throw new IllegalArgumentException("Incorrect syntax");
}
return oid;
}
}