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PKCS#11 wrapper based on sunpkcs11
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// Copyright (c) 2002 Graz University of Technology. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. The end-user documentation included with the redistribution, if any, must
// include the following acknowledgment:
//
// "This product includes software developed by IAIK of Graz University of
// Technology."
//
// Alternately, this acknowledgment may appear in the software itself, if and
// wherever such third-party acknowledgments normally appear.
//
// 4. The names "Graz University of Technology" and "IAIK of Graz University of
// Technology" must not be used to endorse or promote products derived from
// this software without prior written permission.
//
// 5. Products derived from this software may not be called "IAIK PKCS Wrapper",
// nor may "IAIK" appear in their name, without prior written permission of
// Graz University of Technology.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE LICENSOR BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
// OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package iaik.pkcs.pkcs11;
import iaik.pkcs.pkcs11.parameters.CCMParameters;
import iaik.pkcs.pkcs11.wrapper.Functions;
import sun.security.pkcs11.wrapper.CK_ATTRIBUTE;
import sun.security.pkcs11.wrapper.CK_DATE;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigInteger;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* A class consisting of static methods only which provide certain static
* pieces of code that are used frequently in this project.
*
* @author Karl Scheibelhofer
* @author Lijun Liao
* @version 1.0
*/
public class Util {
public static T requireNonNull(String paramName, T param) {
if (param == null) {
throw new NullPointerException(
"Argument \"" + paramName + "\" must not be null.");
}
return param;
}
/**
* Parse a time character array as defined in PKCS#11 and return is as a
* Date object.
*
* @param timeChars
* A time encoded as character array as specified in PKCS#11.
* @return A Date object set to the time indicated in the given char-array.
* null, if the given char array is null or the format is wrong.
*/
public static Date parseTime(char[] timeChars) {
Date time = null;
if ((timeChars != null) && timeChars.length > 2) {
String timeString = new String(timeChars, 0, timeChars.length - 2);
try {
SimpleDateFormat utc = new SimpleDateFormat("yyyyMMddhhmmss");
utc.setTimeZone(TimeZone.getTimeZone("UTC"));
time = utc.parse(timeString);
} catch (ParseException ex) { /* nothing else to be done */
}
}
return time;
}
/**
* Convert the given CK_DATE object to a Date object.
*
* @param ckDate
* The object providing the date information.
* @return The new Date object or null, if the given ckDate is null.
*/
public static Date convertToDate(CK_DATE ckDate) {
Date date = null;
if (ckDate != null) {
int year = Integer.parseInt(new String(ckDate.year));
int month = Integer.parseInt(new String(ckDate.month));
int day = Integer.parseInt(new String(ckDate.day));
// poor performance, consider alternatives
Calendar calendar = new GregorianCalendar();
// calendar starts months with 0
calendar.set(year, Calendar.JANUARY + (month - 1), day);
date = calendar.getTime();
}
return date;
}
/**
* Convert the given Date object to a CK_DATE object.
*
* @param date
* The object providing the date information.
* @return The new CK_DATE object or null, if the given date is null.
*/
public static CK_DATE convertToCkDate(Date date) {
CK_DATE ckDate = null;
if (date != null) {
//poor memory/performance behavior, consider alternatives
Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
int year = calendar.get(Calendar.YEAR);
// month counting starts with zero
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
ckDate = new CK_DATE(
toCharArray(year, 4),
toCharArray(month, 2),
toCharArray(day, 2));
}
return ckDate;
}
/**
* Converts the given number into a char-array. If the length of the array
* is shorter than the required exact length, the array is padded with
* leading '0' chars. If the array is longer than the wanted length the most
* significant digits are cut off until the array has the exact length.
*
* @param number
* The number to convert to a char array.
* @param exactArrayLength
* The exact length of the returned array.
* @return The number as char array, one char for each decimal digit.
*/
public static char[] toCharArray(int number, int exactArrayLength) {
char[] charArray = null;
String numberString = Integer.toString(number);
char[] numberChars = numberString.toCharArray();
if (numberChars.length > exactArrayLength) {
// cut off digits beginning at most significant digit
charArray = new char[exactArrayLength];
for (int i = 0; i < charArray.length; i++) {
charArray[i] = numberChars[i];
}
} else if (numberChars.length < exactArrayLength) {
// pad with '0' leading chars
charArray = new char[exactArrayLength];
int offset = exactArrayLength - numberChars.length;
for (int i = 0; i < charArray.length; i++) {
charArray[i] = (i < offset) ? '0' : numberChars[i - offset];
}
} else {
charArray = numberChars;
}
return charArray;
}
/**
* Converts the given string to a char-array of exactly the given length.
* If the given string is short than the wanted length, then the array is
* padded with trailing padding chars. If the string is longer, the last
* character are cut off that the string has the wanted size.
*
* @param string
* The string to convert.
* @param exactArrayLength
* The length of the returned char-array.
* @param paddingChar
* The character to use for padding, if necessary.
* @return The string as char array, padded or cut off, if necessary.
* The array will have length exactArrayLength. null, if the
* given string is null.
*/
public static char[] toPaddedCharArray(String string, int exactArrayLength,
char paddingChar) {
char[] charArray = null;
if (string != null) {
int stringLength = string.length();
charArray = new char[exactArrayLength];
string.getChars(0, Math.min(stringLength, exactArrayLength),
charArray, 0);
// fill the rest of the array with padding char
for (int i = stringLength; i < charArray.length; i++) {
charArray[i] = paddingChar;
}
}
return charArray;
}
/**
* Convert a BigInteger to a byte-array, but treat the byte-array given from
* the BigInteger as unsigned and removing any leading zero bytes; e.g. a
* 1024 bit integer with its highest bit set will result in an 128 byte
* array.
*
* @param bigInteger
* The BigInteger to convert.
* @return The byte-array representation of the BigInterger without
* signum-bit. null, if the BigInteger is null.
*/
public static byte[] unsignedBigIntergerToByteArray(BigInteger bigInteger) {
if (bigInteger == null) {
return null;
}
byte[] integerBytes = bigInteger.toByteArray();
byte[] unsignedIntegerBytes;
if ((integerBytes.length > 0) && (integerBytes[0] == 0x00)) {
unsignedIntegerBytes = new byte[integerBytes.length - 1];
for (int i = 0; i < unsignedIntegerBytes.length; i++) {
unsignedIntegerBytes[i] = integerBytes[i + 1];
}
} else {
unsignedIntegerBytes = integerBytes;
}
return unsignedIntegerBytes;
}
/**
* Converts the given vector into an array of CK_ATTRIBUTE elements.
* Elements not of type CK_ATTRIBUTE will not be present in the resulting
* array and be set to null.
*
* @param attributes
* The vector which contains the attributes.
* @return The array of the attributes.
*/
public static CK_ATTRIBUTE[] convertAttributesVectorToArray(
Vector attributes) {
if (attributes == null) {
return null;
}
int numberOfAttributes = attributes.size();
CK_ATTRIBUTE[] attributeArray = new CK_ATTRIBUTE[numberOfAttributes];
for (int i = 0; i < numberOfAttributes; i++) {
attributeArray[i] = attributes.elementAt(i);
}
return attributeArray;
}
public static boolean objEquals(Object obj1, Object obj2) {
if (obj1 == null) {
return obj2 == null;
} else {
return obj1.equals(obj2);
}
}
/**
* Converts a long value to a hexadecimal String of length 16. Includes
* leading zeros if necessary.
*
* @param value
* The long value to be converted.
* @return The hexadecimal string representation of the long value.
*/
static String toFullHex(long value) {
return Functions.toFullHex(value);
}
/**
* Converts a byte array to a hexadecimal String. Each byte is presented by
* its two digit hex-code; 0x0A to "0a", 0x00 to "00". No leading "0x" is
* included in the result.
*
* @param value
* The byte array to be converted
* @return the hexadecimal string representation of the byte array
*/
public static String toHex(byte[] value) {
if (value == null) {
return null;
}
return Functions.toHexString(value);
}
public static String concat(String s1, String... strs) {
int len = (s1 == null) ? 4 : s1.length();
for (String str : strs) {
len += (str == null) ? 4 : str.length();
}
StringBuilder sb = new StringBuilder(len);
sb.append(s1);
for (String str : strs) {
sb.append(str);
}
return sb.toString();
}
public static String concatObjects(Object o1, Object... objs) {
StringBuilder sb = new StringBuilder();
sb.append(o1);
for (Object obj : objs) {
sb.append(obj);
}
return sb.toString();
}
public static String concatObjectsCap(int cap, Object o1, Object... objs) {
StringBuilder sb = new StringBuilder(cap);
sb.append(o1);
for (Object obj : objs) {
sb.append(obj);
}
return sb.toString();
}
/**
* Calculate a hash code for the given byte array.
*
* @param array
* The byte array.
* @return A hash code for the given array.
*/
public static int hashCode(byte[] array) {
int hash = 0;
if (array != null) {
for (int i = 0; (i < 4) && (i < array.length); i++) {
hash ^= (0xFF & array[i]) << ((i % 4) << 3);
}
}
return hash;
}
/**
* Calculate a hash code for the given char array.
*
* @param array
* The char array.
* @return A hash code for the given array.
*/
public static int hashCode(char[] array) {
int hash = 0;
if (array != null) {
for (int i = 0; (i < 4) && (i < array.length); i++) {
hash ^= (0xFFFFFFFF & array[i]);
}
}
return hash;
}
/**
* Calculate a hash code for the given long array.
*
* @param array
* The long array.
* @return A hash code for the given array.
*/
public static int hashCode(long[] array) {
int hash = 0;
if (array != null) {
for (int i = 0; (i < 4) && (i < array.length); i++) {
hash ^= (0xFFFFFFFF & (array[i] >> 4));
hash ^= (0xFFFFFFFF & array[i]);
}
}
return hash;
}
public static Field getField(Class clazz, String fieldName) {
try {
return clazz.getField(fieldName);
} catch (Throwable th) {
return null;
}
}
public static Method getMethod(Class clazz, String name,
Class... parameterTypes) {
try {
return clazz.getMethod(name, parameterTypes);
} catch (Throwable th) {
return null;
}
}
public static Constructor getConstructor(
String className, Class... parameterTypes) {
try {
Class clazz = Class.forName(className, false,
CCMParameters.class.getClassLoader());
return getConstructor(clazz, parameterTypes);
} catch (Throwable th) {
return null;
}
}
public static Constructor getConstructor(
Class clazz, Class... parameterTypes) {
try {
return clazz.getConstructor(parameterTypes);
} catch (Throwable th) {
return null;
}
}
}