nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/signal/util/RandomUtils.java

   1 package org.asamk.signal.util;
   2
   3 import java.security.NoSuchAlgorithmException;
   4 import java.security.SecureRandom;
   5
   6 public class RandomUtils {
   7
   8     private static final ThreadLocal<SecureRandom> LOCAL_RANDOM = ThreadLocal.withInitial(() -> {
   9         var rand = getSecureRandomUnseeded();
  10
  11         // Let the SecureRandom seed it self initially
  12         rand.nextBoolean();
  13
  14         return rand;
  15     });
  16
  17     private static SecureRandom getSecureRandomUnseeded() {
  18         try {
  19             return SecureRandom.getInstance("NativePRNG");
  20         } catch (NoSuchAlgorithmException e) {
  21             // Fallback to SHA1PRNG if NativePRNG is not available (e.g. on windows)
  22             try {
  23                 return SecureRandom.getInstance("SHA1PRNG");
  24             } catch (NoSuchAlgorithmException e1) {
  25                 // Fallback to default
  26                 return new SecureRandom();
  27             }
  28         }
  29     }
  30
  31     public static SecureRandom getSecureRandom() {
  32         return LOCAL_RANDOM.get();
  33     }
  34 }