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    <p>Resurrecting this old issue because I believe the current answers are wrong and this thread pops high in google searches.</p> <p>Looked at the code and ran a couple of simple tests. jbcryt appears to be thread safe.</p> <p>In the code: -although it has mostly static method, those methods create instances of the bcrypt class to do computations when needed.</p> <p>Test samples: -had bcrypt not been thread safe, I would have expected either of these methods to throw some form of error, which they did not.</p> <pre><code>@Test public void multiThreadHash() throws InterruptedException{ List&lt;Thread&gt; threads = new ArrayList&lt;Thread&gt;(); for(int i = 0; i&lt;40; i++){ threads.add(new Thread(){ @Override public void run() { long start = System.currentTimeMillis(); while(System.currentTimeMillis()&lt;start+12000){ String password = "sample"; String hash = BCrypt.gensalt(4); String hashed = BCrypt.hashpw(password, hash); } } }); } for(Thread t: threads){ t.start(); } Thread.sleep(12200L); } @Test public void multiThreadReproductibleHash() throws InterruptedException{ List&lt;Thread&gt; threads = new ArrayList&lt;Thread&gt;(); for(int i = 0; i&lt;40; i++){ threads.add(new Thread(){ @Override public void run() { long start = System.currentTimeMillis(); while(System.currentTimeMillis()&lt;start+12000){ String password = "sample"; String hash = "$2a$04$/YkrS2ifyAloNVUk5qAO7O"; String expected = "$2a$04$/YkrS2ifyAloNVUk5qAO7OlqIsp2ECTMDinOij9wvn7nXPRJCo8Gy"; String hashed = BCrypt.hashpw(password, hash); Assert.assertEquals(expected, hashed); } } }); } for(Thread t: threads){ t.start(); } Thread.sleep(12200L); } </code></pre>
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    1. POIs jBCrypt 0.3 threadsafe?
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    1. USFrançois Lamarre
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