Cellular Network Infrastructure » IMSI Pseudonymization

SOURCES = \

	  src/org/osmocom/IMSIPseudo/Bytes.java \

	  src/org/osmocom/IMSIPseudo/MobileIdentity.java \

	  src/org/osmocom/IMSIPseudo/IMSIPseudo.java \

	  $(NULL)

	javac -target 1.1 -source 1.3 -classpath test/classes -g -d ./test/classes src/org/osmocom/IMSIPseudo/Bytes.java

/* Copyright 2020 sysmocom s.f.m.c. GmbH

 * SPDX-License-Identifier: Apache-2.0 */

package org.osmocom.IMSIPseudo;

public class Bytes {

	public static byte nibble2hex(byte nibble)

	{

		nibble = (byte)(nibble & 0xf);

		if (nibble < 0xa)

			return (byte)('0' + nibble);

		else

			return (byte)('a' + nibble - 0xa);

	}

	public static byte[] hexdump(byte data[])

	{

		byte res[] = new byte[(byte)(data.length*2)];

		for (byte i = 0; i < data.length; i++) {

			res[(byte)(i*2)] = nibble2hex((byte)(data[i] >> 4));

			res[(byte)(i*2 + 1)] = nibble2hex(data[i]);

		}

		return res;

	}

	public static boolean equals(byte a[], byte b[])

	{

		if (a.length != b.length)

			return false;

		for (short i = 0; i < (short)a.length; i++) {

			if (a[i] != b[i])

				return false;

		}

		return true;

	}

	public static boolean isDigit(byte digits[])

	{

		for (short i = 0; i < (short)digits.length; i++) {

			if (digits[i] < '0' || digits[i] > '9')

				return false;

		}

		return true;

	}

	public static byte[] toStr(byte byte_nr)

	{

		byte str[];

		short nr = byte_nr;

		byte d;

		byte l = 0;

		if (nr < 0) {

			l = 1;

			nr = (short)-nr;

		}

		if (nr > 99) {

			l += 3;

			d = 100;

		}

		else if (nr > 9) {

			l += 2;

			d = 10;

		}

		else {

			str = new byte[1];

			l += 1;

			d = 1;

		}

		byte i = 0;

		str = new byte[l];

		if (byte_nr < 0)

			str[i++] = '-';

		while (d > 0) {

			str[i++] = (byte)('0' + (nr / d));

			nr %= d;

			d /= 10;

		}

		return str;

	}

}