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/*
* 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
*/
package org.apache.harmony.security.tests.asn1.der;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.util.Arrays;
import junit.framework.TestCase;
import org.apache.harmony.security.asn1.ASN1Exception;
import org.apache.harmony.security.asn1.ASN1Integer;
import org.apache.harmony.security.asn1.DerInputStream;
import org.apache.harmony.security.asn1.DerOutputStream;
/**
* ASN.1 DER test for INTEGER type
*
* @see http://asn1.elibel.tm.fr/en/standards/index.htm
*/
public class IntegerTest extends TestCase {
public static final Object[][] validTestcase = {
// BigInteger / two's-complement representation / encoding
{ new BigInteger("0"), null, null },
{ new BigInteger("1"), null, null },
{ new BigInteger("-1"), null, null },
{ new BigInteger("127"), null, null },
{ new BigInteger("-127"), null, null },
{ new BigInteger("128"), null, null },
{ new BigInteger("-128"), null, null },
{ new BigInteger("32767"), null, null },
{ new BigInteger("-32767"), null, null },
{ new BigInteger("32768"), null, null },
{ new BigInteger("-32768"), null, null },
{ new BigInteger("1234567890"), null, null },
{ new BigInteger("-1234567890"), null, null },
{ // 20 octets
new BigInteger(new byte[] { 0x7F, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }), null,
null }, };
static {
for (int i = 0; i < validTestcase.length; i++) {
// get two's-complement representation
byte[] array = ((BigInteger) validTestcase[i][0]).toByteArray();
// create encoding
byte[] encoded = new byte[array.length + 2];
encoded[0] = 0x02;
encoded[1] = (byte) (encoded.length - 2);
System.arraycopy(array, 0, encoded, 2, encoded[1]);
// assign is to testcases
validTestcase[i][1] = array;
validTestcase[i][2] = encoded;
}
}
/**
* Tests decoding/encoding integers to/from byte array
*/
public void testDecode_Encode() throws IOException {
// oid decoder/encoder for testing
ASN1Integer asn1 = ASN1Integer.getInstance();
// decode from byte array
for (int i = 0; i < validTestcase.length; i++) {
DerInputStream in = new DerInputStream((byte[]) validTestcase[i][2]);
assertTrue((validTestcase[i][0]).toString(), // message
Arrays.equals((byte[]) validTestcase[i][1], // expected
(byte[]) asn1.decode(in))); // returned
}
// decode from input stream
for (int i = 0; i < validTestcase.length; i++) {
DerInputStream in = new DerInputStream(new ByteArrayInputStream(
(byte[]) validTestcase[i][2]));
assertTrue((validTestcase[i][0]).toString(), //message
Arrays.equals((byte[]) validTestcase[i][1], //expected
(byte[]) asn1.decode(in))); //returned
}
// encoding
for (int i = 0; i < validTestcase.length; i++) {
DerOutputStream out = new DerOutputStream(asn1, validTestcase[i][1]);
assertTrue((validTestcase[i][0]).toString(), //message
Arrays.equals((byte[]) validTestcase[i][2], //expected
out.encoded));//returned
}
}
/**
* Tests invalid ASN.1 integer encodings
*/
public void testDecode_Invalid() throws IOException {
byte[][] invalid = new byte[][] {
// wrong tag: tag is not 0x02
new byte[] { 0x01, 0x01, 0x00 },
// wrong length: length is 0
new byte[] { 0x02, 0x00 },
// wrong content: is not encoded in minimum number of octets
new byte[] { 0x02, 0x02, 0x00, 0x00 },
// wrong content: is not encoded in minimum number of octets
new byte[] { 0x02, 0x02, (byte) 0xFF, (byte) 0x80 } };
for (int i = 0; i < invalid.length; i++) {
try {
DerInputStream in = new DerInputStream(invalid[i]);
ASN1Integer.getInstance().decode(in);
fail("No expected ASN1Exception for:" + i);
} catch (ASN1Exception e) {
}
}
}
public void testConversion() {
int[] testcase = new int[] { 0, 1, -1, 127, -127, 128, -128, 32767,
-32768, Integer.MAX_VALUE, Integer.MIN_VALUE };
for (int i = 0; i < testcase.length; i++) {
assertEquals("Testcase: " + i, testcase[i], ASN1Integer
.toIntValue(ASN1Integer.fromIntValue(testcase[i])));
}
}
}
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