Java example source code file (ObjectIdentifier.java)
The ObjectIdentifier.java Java example source code
/*
* Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.security.util;
import java.io.*;
import java.math.BigInteger;
import java.util.Arrays;
/**
* Represent an ISO Object Identifier.
*
* <P>Object Identifiers are arbitrary length hierarchical identifiers.
* The individual components are numbers, and they define paths from the
* root of an ISO-managed identifier space. You will sometimes see a
* string name used instead of (or in addition to) the numerical id.
* These are synonyms for the numerical IDs, but are not widely used
* since most sites do not know all the requisite strings, while all
* sites can parse the numeric forms.
*
* <P>So for example, JavaSoft has the sole authority to assign the
* meaning to identifiers below the 1.3.6.1.4.1.42.2.17 node in the
* hierarchy, and other organizations can easily acquire the ability
* to assign such unique identifiers.
*
* @author David Brownell
* @author Amit Kapoor
* @author Hemma Prafullchandra
*/
final public
class ObjectIdentifier implements Serializable
{
/**
* We use the DER value (no tag, no length) as the internal format
* @serial
*/
private byte[] encoding = null;
private transient volatile String stringForm;
/*
* IMPORTANT NOTES FOR CODE CHANGES (bug 4811968) IN JDK 1.7.0
* ===========================================================
*
* (Almost) serialization compatibility with old versions:
*
* serialVersionUID is unchanged. Old field "component" is changed to
* type Object so that "poison" (unknown object type for old versions)
* can be put inside if there are huge components that cannot be saved
* as integers.
*
* New version use the new filed "encoding" only.
*
* Below are all 4 cases in a serialization/deserialization process:
*
* 1. old -> old: Not covered here
* 2. old -> new: There's no "encoding" field, new readObject() reads
* "components" and "componentLen" instead and inits correctly.
* 3. new -> new: "encoding" field exists, new readObject() uses it
* (ignoring the other 2 fields) and inits correctly.
* 4. new -> old: old readObject() only recognizes "components" and
* "componentLen" fields. If no huge components are involved, they
* are serialized as legal values and old object can init correctly.
* Otherwise, old object cannot recognize the form (component not int[])
* and throw a ClassNotFoundException at deserialization time.
*
* Therfore, for the first 3 cases, exact compatibility is preserved. In
* the 4th case, non-huge OID is still supportable in old versions, while
* huge OID is not.
*/
private static final long serialVersionUID = 8697030238860181294L;
/**
* Changed to Object
* @serial
*/
private Object components = null; // path from root
/**
* @serial
*/
private int componentLen = -1; // how much is used.
// Is the components field calculated?
transient private boolean componentsCalculated = false;
private void readObject(ObjectInputStream is)
throws IOException, ClassNotFoundException {
is.defaultReadObject();
if (encoding == null) { // from an old version
init((int[])components, componentLen);
}
}
private void writeObject(ObjectOutputStream os)
throws IOException {
if (!componentsCalculated) {
int[] comps = toIntArray();
if (comps != null) { // every one understands this
components = comps;
componentLen = comps.length;
} else {
components = HugeOidNotSupportedByOldJDK.theOne;
}
componentsCalculated = true;
}
os.defaultWriteObject();
}
static class HugeOidNotSupportedByOldJDK implements Serializable {
private static final long serialVersionUID = 1L;
static HugeOidNotSupportedByOldJDK theOne = new HugeOidNotSupportedByOldJDK();
}
/**
* Constructs, from a string. This string should be of the form 1.23.56.
* Validity check included.
*/
public ObjectIdentifier (String oid) throws IOException
{
int ch = '.';
int start = 0;
int end = 0;
int pos = 0;
byte[] tmp = new byte[oid.length()];
int first = 0, second;
int count = 0;
try {
String comp = null;
do {
int length = 0; // length of one section
end = oid.indexOf(ch,start);
if (end == -1) {
comp = oid.substring(start);
length = oid.length() - start;
} else {
comp = oid.substring(start,end);
length = end - start;
}
if (length > 9) {
BigInteger bignum = new BigInteger(comp);
if (count == 0) {
checkFirstComponent(bignum);
first = bignum.intValue();
} else {
if (count == 1) {
checkSecondComponent(first, bignum);
bignum = bignum.add(BigInteger.valueOf(40*first));
} else {
checkOtherComponent(count, bignum);
}
pos += pack7Oid(bignum, tmp, pos);
}
} else {
int num = Integer.parseInt(comp);
if (count == 0) {
checkFirstComponent(num);
first = num;
} else {
if (count == 1) {
checkSecondComponent(first, num);
num += 40 * first;
} else {
checkOtherComponent(count, num);
}
pos += pack7Oid(num, tmp, pos);
}
}
start = end + 1;
count++;
} while (end != -1);
checkCount(count);
encoding = new byte[pos];
System.arraycopy(tmp, 0, encoding, 0, pos);
this.stringForm = oid;
} catch (IOException ioe) { // already detected by checkXXX
throw ioe;
} catch (Exception e) {
throw new IOException("ObjectIdentifier() -- Invalid format: "
+ e.toString(), e);
}
}
/**
* Constructor, from an array of integers.
* Validity check included.
*/
public ObjectIdentifier (int values []) throws IOException
{
checkCount(values.length);
checkFirstComponent(values[0]);
checkSecondComponent(values[0], values[1]);
for (int i=2; i<values.length; i++)
checkOtherComponent(i, values[i]);
init(values, values.length);
}
/**
* Constructor, from an ASN.1 encoded input stream.
* Validity check NOT included.
* The encoding of the ID in the stream uses "DER", a BER/1 subset.
* In this case, that means a triple { typeId, length, data }.
*
* <P>NOTE: When an exception is thrown, the
* input stream has not been returned to its "initial" state.
*
* @param in DER-encoded data holding an object ID
* @exception IOException indicates a decoding error
*/
public ObjectIdentifier (DerInputStream in) throws IOException
{
byte type_id;
int bufferEnd;
/*
* Object IDs are a "universal" type, and their tag needs only
* one byte of encoding. Verify that the tag of this datum
* is that of an object ID.
*
* Then get and check the length of the ID's encoding. We set
* up so that we can use in.available() to check for the end of
* this value in the data stream.
*/
type_id = (byte) in.getByte ();
if (type_id != DerValue.tag_ObjectId)
throw new IOException (
"ObjectIdentifier() -- data isn't an object ID"
+ " (tag = " + type_id + ")"
);
encoding = new byte[in.getLength()];
in.getBytes(encoding);
check(encoding);
}
/*
* Constructor, from the rest of a DER input buffer;
* the tag and length have been removed/verified
* Validity check NOT included.
*/
ObjectIdentifier (DerInputBuffer buf) throws IOException
{
DerInputStream in = new DerInputStream(buf);
encoding = new byte[in.available()];
in.getBytes(encoding);
check(encoding);
}
private void init(int[] components, int length) {
int pos = 0;
byte[] tmp = new byte[length*5+1]; // +1 for empty input
if (components[1] < Integer.MAX_VALUE - components[0]*40)
pos += pack7Oid(components[0]*40+components[1], tmp, pos);
else {
BigInteger big = BigInteger.valueOf(components[1]);
big = big.add(BigInteger.valueOf(components[0]*40));
pos += pack7Oid(big, tmp, pos);
}
for (int i=2; i<length; i++) {
pos += pack7Oid(components[i], tmp, pos);
}
encoding = new byte[pos];
System.arraycopy(tmp, 0, encoding, 0, pos);
}
/**
* This method is kept for compatibility reasons. The new implementation
* does the check and conversion. All around the JDK, the method is called
* in static blocks to initialize pre-defined ObjectIdentifieies. No
* obvious performance hurt will be made after this change.
*
* Old doc: Create a new ObjectIdentifier for internal use. The values are
* neither checked nor cloned.
*/
public static ObjectIdentifier newInternal(int[] values) {
try {
return new ObjectIdentifier(values);
} catch (IOException ex) {
throw new RuntimeException(ex);
// Should not happen, internal calls always uses legal values.
}
}
/*
* n.b. the only public interface is DerOutputStream.putOID()
*/
void encode (DerOutputStream out) throws IOException
{
out.write (DerValue.tag_ObjectId, encoding);
}
/**
* @deprecated Use equals((Object)oid)
*/
@Deprecated
public boolean equals(ObjectIdentifier other) {
return equals((Object)other);
}
/**
* Compares this identifier with another, for equality.
*
* @return true iff the names are identical.
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof ObjectIdentifier == false) {
return false;
}
ObjectIdentifier other = (ObjectIdentifier)obj;
return Arrays.equals(encoding, other.encoding);
}
@Override
public int hashCode() {
return Arrays.hashCode(encoding);
}
/**
* Private helper method for serialization. To be compatible with old
* versions of JDK.
* @return components in an int array, if all the components are less than
* Integer.MAX_VALUE. Otherwise, null.
*/
private int[] toIntArray() {
int length = encoding.length;
int[] result = new int[20];
int which = 0;
int fromPos = 0;
for (int i = 0; i < length; i++) {
if ((encoding[i] & 0x80) == 0) {
// one section [fromPos..i]
if (i - fromPos + 1 > 4) {
BigInteger big = new BigInteger(pack(encoding, fromPos, i-fromPos+1, 7, 8));
if (fromPos == 0) {
result[which++] = 2;
BigInteger second = big.subtract(BigInteger.valueOf(80));
if (second.compareTo(BigInteger.valueOf(Integer.MAX_VALUE)) == 1) {
return null;
} else {
result[which++] = second.intValue();
}
} else {
if (big.compareTo(BigInteger.valueOf(Integer.MAX_VALUE)) == 1) {
return null;
} else {
result[which++] = big.intValue();
}
}
} else {
int retval = 0;
for (int j = fromPos; j <= i; j++) {
retval <<= 7;
byte tmp = encoding[j];
retval |= (tmp & 0x07f);
}
if (fromPos == 0) {
if (retval < 80) {
result[which++] = retval / 40;
result[which++] = retval % 40;
} else {
result[which++] = 2;
result[which++] = retval - 80;
}
} else {
result[which++] = retval;
}
}
fromPos = i+1;
}
if (which >= result.length) {
result = Arrays.copyOf(result, which + 10);
}
}
return Arrays.copyOf(result, which);
}
/**
* Returns a string form of the object ID. The format is the
* conventional "dot" notation for such IDs, without any
* user-friendly descriptive strings, since those strings
* will not be understood everywhere.
*/
@Override
public String toString() {
String s = stringForm;
if (s == null) {
int length = encoding.length;
StringBuffer sb = new StringBuffer(length * 4);
int fromPos = 0;
for (int i = 0; i < length; i++) {
if ((encoding[i] & 0x80) == 0) {
// one section [fromPos..i]
if (fromPos != 0) { // not the first segment
sb.append('.');
}
if (i - fromPos + 1 > 4) { // maybe big integer
BigInteger big = new BigInteger(pack(encoding, fromPos, i-fromPos+1, 7, 8));
if (fromPos == 0) {
// first section encoded with more than 4 bytes,
// must be 2.something
sb.append("2.");
sb.append(big.subtract(BigInteger.valueOf(80)));
} else {
sb.append(big);
}
} else { // small integer
int retval = 0;
for (int j = fromPos; j <= i; j++) {
retval <<= 7;
byte tmp = encoding[j];
retval |= (tmp & 0x07f);
}
if (fromPos == 0) {
if (retval < 80) {
sb.append(retval/40);
sb.append('.');
sb.append(retval%40);
} else {
sb.append("2.");
sb.append(retval - 80);
}
} else {
sb.append(retval);
}
}
fromPos = i+1;
}
}
s = sb.toString();
stringForm = s;
}
return s;
}
/**
* Repack all bits from input to output. On the both sides, only a portion
* (from the least significant bit) of the 8 bits in a byte is used. This
* number is defined as the number of useful bits (NUB) for the array. All the
* used bits from the input byte array and repacked into the output in the
* exactly same order. The output bits are aligned so that the final bit of
* the input (the least significant bit in the last byte), when repacked as
* the final bit of the output, is still at the least significant position.
* Zeroes will be padded on the left side of the first output byte if
* necessary. All unused bits in the output are also zeroed.
*
* For example: if the input is 01001100 with NUB 8, the output which
* has a NUB 6 will look like:
* 00000001 00001100
* The first 2 bits of the output bytes are unused bits. The other bits
* turn out to be 000001 001100. While the 8 bits on the right are from
* the input, the left 4 zeroes are padded to fill the 6 bits space.
*
* @param in the input byte array
* @param ioffset start point inside <code>in
* @param ilength number of bytes to repack
* @param iw NUB for input
* @param ow NUB for output
* @return the repacked bytes
*/
private static byte[] pack(byte[] in, int ioffset, int ilength, int iw, int ow) {
assert (iw > 0 && iw <= 8): "input NUB must be between 1 and 8";
assert (ow > 0 && ow <= 8): "output NUB must be between 1 and 8";
if (iw == ow) {
return in.clone();
}
int bits = ilength * iw; // number of all used bits
byte[] out = new byte[(bits+ow-1)/ow];
// starting from the 0th bit in the input
int ipos = 0;
// the number of padding 0's needed in the output, skip them
int opos = (bits+ow-1)/ow*ow-bits;
while(ipos < bits) {
int count = iw - ipos%iw; // unpacked bits in current input byte
if (count > ow - opos%ow) { // free space available in output byte
count = ow - opos%ow; // choose the smaller number
}
// and move them!
out[opos/ow] |= // paste!
(((in[ioffset+ipos/iw]+256) // locate the byte (+256 so that it's never negative)
>> (iw-ipos%iw-count)) // move to the end of a byte
& ((1 << (count))-1)) // zero out all other bits
<< (ow-opos%ow-count); // move to the output position
ipos += count; // advance
opos += count; // advance
}
return out;
}
/**
* Repack from NUB 8 to a NUB 7 OID sub-identifier, remove all
* unnecessary 0 headings, set the first bit of all non-tail
* output bytes to 1 (as ITU-T Rec. X.690 8.19.2 says), and
* paste it into an existing byte array.
* @param out the existing array to be pasted into
* @param ooffset the starting position to paste
* @return the number of bytes pasted
*/
private static int pack7Oid(byte[] in, int ioffset, int ilength, byte[] out, int ooffset) {
byte[] pack = pack(in, ioffset, ilength, 8, 7);
int firstNonZero = pack.length-1; // paste at least one byte
for (int i=pack.length-2; i>=0; i--) {
if (pack[i] != 0) {
firstNonZero = i;
}
pack[i] |= 0x80;
}
System.arraycopy(pack, firstNonZero, out, ooffset, pack.length-firstNonZero);
return pack.length-firstNonZero;
}
/**
* Repack from NUB 7 to NUB 8, remove all unnecessary 0
* headings, and paste it into an existing byte array.
* @param out the existing array to be pasted into
* @param ooffset the starting position to paste
* @return the number of bytes pasted
*/
private static int pack8(byte[] in, int ioffset, int ilength, byte[] out, int ooffset) {
byte[] pack = pack(in, ioffset, ilength, 7, 8);
int firstNonZero = pack.length-1; // paste at least one byte
for (int i=pack.length-2; i>=0; i--) {
if (pack[i] != 0) {
firstNonZero = i;
}
}
System.arraycopy(pack, firstNonZero, out, ooffset, pack.length-firstNonZero);
return pack.length-firstNonZero;
}
/**
* Pack the int into a OID sub-identifier DER encoding
*/
private static int pack7Oid(int input, byte[] out, int ooffset) {
byte[] b = new byte[4];
b[0] = (byte)(input >> 24);
b[1] = (byte)(input >> 16);
b[2] = (byte)(input >> 8);
b[3] = (byte)(input);
return pack7Oid(b, 0, 4, out, ooffset);
}
/**
* Pack the BigInteger into a OID subidentifier DER encoding
*/
private static int pack7Oid(BigInteger input, byte[] out, int ooffset) {
byte[] b = input.toByteArray();
return pack7Oid(b, 0, b.length, out, ooffset);
}
/**
* Private methods to check validity of OID. They must be --
* 1. at least 2 components
* 2. all components must be non-negative
* 3. the first must be 0, 1 or 2
* 4. if the first is 0 or 1, the second must be <40
*/
/**
* Check the DER encoding. Since DER encoding defines that the integer bits
* are unsigned, so there's no need to check the MSB.
*/
private static void check(byte[] encoding) throws IOException {
int length = encoding.length;
if (length < 1 || // too short
(encoding[length - 1] & 0x80) != 0) { // not ended
throw new IOException("ObjectIdentifier() -- " +
"Invalid DER encoding, not ended");
}
for (int i=0; i<length; i++) {
// 0x80 at the beginning of a subidentifier
if (encoding[i] == (byte)0x80 &&
(i==0 || (encoding[i-1] & 0x80) == 0)) {
throw new IOException("ObjectIdentifier() -- " +
"Invalid DER encoding, useless extra octet detected");
}
}
}
private static void checkCount(int count) throws IOException {
if (count < 2) {
throw new IOException("ObjectIdentifier() -- " +
"Must be at least two oid components ");
}
}
private static void checkFirstComponent(int first) throws IOException {
if (first < 0 || first > 2) {
throw new IOException("ObjectIdentifier() -- " +
"First oid component is invalid ");
}
}
private static void checkFirstComponent(BigInteger first) throws IOException {
if (first.signum() == -1 ||
first.compareTo(BigInteger.valueOf(2)) == 1) {
throw new IOException("ObjectIdentifier() -- " +
"First oid component is invalid ");
}
}
private static void checkSecondComponent(int first, int second) throws IOException {
if (second < 0 || first != 2 && second > 39) {
throw new IOException("ObjectIdentifier() -- " +
"Second oid component is invalid ");
}
}
private static void checkSecondComponent(int first, BigInteger second) throws IOException {
if (second.signum() == -1 ||
first != 2 &&
second.compareTo(BigInteger.valueOf(39)) == 1) {
throw new IOException("ObjectIdentifier() -- " +
"Second oid component is invalid ");
}
}
private static void checkOtherComponent(int i, int num) throws IOException {
if (num < 0) {
throw new IOException("ObjectIdentifier() -- " +
"oid component #" + (i+1) + " must be non-negative ");
}
}
private static void checkOtherComponent(int i, BigInteger num) throws IOException {
if (num.signum() == -1) {
throw new IOException("ObjectIdentifier() -- " +
"oid component #" + (i+1) + " must be non-negative ");
}
}
}
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