aboutsummaryrefslogtreecommitdiffstats
path: root/src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java
diff options
context:
space:
mode:
Diffstat (limited to 'src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java')
-rw-r--r--src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java129
1 files changed, 0 insertions, 129 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java b/src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java
deleted file mode 100644
index 9599aa37..00000000
--- a/src/main/java/de/thedevstack/conversationsplus/utils/CryptoHelper.java
+++ /dev/null
@@ -1,129 +0,0 @@
-package de.thedevstack.conversationsplus.utils;
-
-import java.security.SecureRandom;
-import java.text.Normalizer;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Iterator;
-import java.util.LinkedHashSet;
-import java.util.List;
-
-import de.thedevstack.conversationsplus.Config;
-
-public final class CryptoHelper {
- public static final String FILETRANSFER = "?FILETRANSFERv1:";
- private final static char[] hexArray = "0123456789abcdef".toCharArray();
- private final static char[] vowels = "aeiou".toCharArray();
- private final static char[] consonants = "bcdfghjklmnpqrstvwxyz".toCharArray();
- final public static byte[] ONE = new byte[] { 0, 0, 0, 1 };
-
- public static String bytesToHex(byte[] bytes) {
- char[] hexChars = new char[bytes.length * 2];
- for (int j = 0; j < bytes.length; j++) {
- int v = bytes[j] & 0xFF;
- hexChars[j * 2] = hexArray[v >>> 4];
- hexChars[j * 2 + 1] = hexArray[v & 0x0F];
- }
- return new String(hexChars);
- }
-
- public static byte[] hexToBytes(String hexString) {
- int len = hexString.length();
- byte[] array = new byte[len / 2];
- for (int i = 0; i < len; i += 2) {
- array[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character
- .digit(hexString.charAt(i + 1), 16));
- }
- return array;
- }
-
- public static String hexToString(final String hexString) {
- return new String(hexToBytes(hexString));
- }
-
- public static byte[] concatenateByteArrays(byte[] a, byte[] b) {
- byte[] result = new byte[a.length + b.length];
- System.arraycopy(a, 0, result, 0, a.length);
- System.arraycopy(b, 0, result, a.length, b.length);
- return result;
- }
-
- public static String randomMucName(SecureRandom random) {
- return randomWord(3, random) + "." + randomWord(7, random);
- }
-
- private static String randomWord(int lenght, SecureRandom random) {
- StringBuilder builder = new StringBuilder(lenght);
- for (int i = 0; i < lenght; ++i) {
- if (i % 2 == 0) {
- builder.append(consonants[random.nextInt(consonants.length)]);
- } else {
- builder.append(vowels[random.nextInt(vowels.length)]);
- }
- }
- return builder.toString();
- }
-
- /**
- * Escapes usernames or passwords for SASL.
- */
- public static String saslEscape(final String s) {
- final StringBuilder sb = new StringBuilder((int) (s.length() * 1.1));
- for (int i = 0; i < s.length(); i++) {
- char c = s.charAt(i);
- switch (c) {
- case ',':
- sb.append("=2C");
- break;
- case '=':
- sb.append("=3D");
- break;
- default:
- sb.append(c);
- break;
- }
- }
- return sb.toString();
- }
-
- public static String saslPrep(final String s) {
- return Normalizer.normalize(s, Normalizer.Form.NFKC);
- }
-
- public static String prettifyFingerprint(String fingerprint) {
- if (fingerprint==null) {
- return "";
- } else if (fingerprint.length() < 40) {
- return fingerprint;
- }
- StringBuilder builder = new StringBuilder(fingerprint);
- builder.insert(8, " ");
- builder.insert(17, " ");
- builder.insert(26, " ");
- builder.insert(35, " ");
- return builder.toString();
- }
-
- public static String[] getOrderedCipherSuites(final String[] platformSupportedCipherSuites) {
- final Collection<String> cipherSuites = new LinkedHashSet<>(Arrays.asList(Config.ENABLED_CIPHERS));
- final List<String> platformCiphers = Arrays.asList(platformSupportedCipherSuites);
- cipherSuites.retainAll(platformCiphers);
- cipherSuites.addAll(platformCiphers);
- filterWeakCipherSuites(cipherSuites);
- return cipherSuites.toArray(new String[cipherSuites.size()]);
- }
-
- private static void filterWeakCipherSuites(final Collection<String> cipherSuites) {
- final Iterator<String> it = cipherSuites.iterator();
- while (it.hasNext()) {
- String cipherName = it.next();
- // remove all ciphers with no or very weak encryption or no authentication
- for (String weakCipherPattern : Config.WEAK_CIPHER_PATTERNS) {
- if (cipherName.contains(weakCipherPattern)) {
- it.remove();
- break;
- }
- }
- }
- }
-}