org.apache.harmony.security.asn1.ASN1Oid 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 Vladimir N. Molotkov, Stepan M. Mishura
* @version $Revision$
*/
package org.apache.harmony.security.asn1;
import java.io.IOException;
/**
* This class represents ASN.1 Object Identifier type.
*
* @see ASN.1
*/
public class ASN1Oid extends ASN1Primitive {
/** default implementation */
private static final ASN1Oid ASN1 = new ASN1Oid();
/**
* Constructs ASN.1 Object Identifier type
*
* The constructor is provided for inheritance purposes
* when there is a need to create a custom ASN.1 Object Identifier type.
* To get a default implementation it is recommended to use
* getInstance() method.
*/
public ASN1Oid() {
super(TAG_OID);
}
/**
* Returns ASN.1 Object Identifier type default implementation
*
* The default implementation works with encoding
* that is represented as array of integers.
*
* @return ASN.1 Object Identifier type default implementation
*/
public static ASN1Oid getInstance() {
return ASN1;
}
public Object decode(BerInputStream in) throws IOException {
in.readOID();
if (in.isVerify) {
return null;
}
return getDecodedObject(in);
}
/**
* Extracts array of integers from BER input stream.
*
* @return array of integers
*/
@Override public Object getDecodedObject(BerInputStream in) throws IOException {
// Allocate and decode
int oidElement = in.oidElement;
int[] oid = new int[oidElement];
for (int id = 1, i = 0; id < oid.length; id++, i++) {
int octet = in.buffer[in.contentOffset + i];
oidElement = octet & 0x7F;
while ((octet & 0x80) != 0) {
i++;
octet = in.buffer[in.contentOffset + i];
oidElement = oidElement << 7 | (octet & 0x7f);
}
oid[id] = oidElement;
}
// Special handling for the first packed OID element
if (oid[1] > 79) {
oid[0] = 2;
oid[1] = oid[1] - 80;
} else {
oid[0] = oid[1] / 40;
oid[1] = oid[1] % 40;
}
return oid;
}
public void encodeContent(BerOutputStream out) {
out.encodeOID();
}
public void setEncodingContent(BerOutputStream out) {
int[] oid = (int[]) out.content;
int length = 0;
// first subidentifier
int elem = oid[0] * 40 + oid[1];
if (elem == 0) {
length = 1;
} else {
for (; elem > 0; elem = elem >> 7) {
length++;
}
}
// the rest of subidentifiers
for (int i = 2; i < oid.length; i++) {
if (oid[i] == 0) {
length++;
continue;
}
for (elem = oid[i]; elem > 0; elem = elem >> 7) {
length++;
}
}
out.length = length;
}
private static final ASN1Oid STRING_OID = new ASN1Oid() {
@Override public Object getDecodedObject(BerInputStream in) throws IOException {
StringBuilder buf = new StringBuilder();
//Special handling for the first packed OID element
int octet = in.buffer[in.contentOffset];
int element = octet & 0x7F;
int index = 0;
while ((octet & 0x80) != 0) {
index++;
octet = in.buffer[in.contentOffset + index];
element = element << 7 | (octet & 0x7F);
}
if (element > 79) {
buf.append('2');
buf.append('.');
buf.append(element - 80);
} else {
buf.append(element / 40);
buf.append('.');
buf.append(element % 40);
}
// the rest of subidentifiers
for (int j = 2; j < in.oidElement; j++) {
buf.append('.');
index++;
octet = in.buffer[in.contentOffset + index];
element = octet & 0x7F;
while ((octet & 0x80) != 0) {
index++;
octet = in.buffer[in.contentOffset + index];
element = element << 7 | (octet & 0x7f);
}
buf.append(element);
}
return buf.toString();
}
@Override public void setEncodingContent(BerOutputStream out) {
//FIXME this is a stub for a while
out.content = ObjectIdentifier.toIntArray((String) out.content);
super.setEncodingContent(out);
}
};
/**
* Returns ASN.1 Object Identifier type implementation
*
* This implementation works with encoding
* that is mapped to java.lang.String object.
*
* @return ASN.1 Object Identifier type implementation
*/
public static ASN1Oid getInstanceForString() {
return STRING_OID;
}
}