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    <p>You had all the code you needed to produce a self-signed certificate. You just needed to ensure your chain contained only one certificate.</p> <pre><code>public static void testKeyStore() throws Exception { try { String storeName = "path/to/store"; java.security.KeyPairGenerator keyPairGenerator = KeyPairGenerator .getInstance("RSA"); keyPairGenerator.initialize(2048); KeyPair keyPair = keyPairGenerator.generateKeyPair(); PublicKey publicKey = keyPair.getPublic(); PrivateKey privateKey = keyPair.getPrivate(); X509Certificate selfCert = createCertificate("CN=Client", "CN=Client", publicKey, privateKey); // Note: if you just want to store this certificate then write the // contents of selfCert.getEncoded() to file java.security.cert.Certificate[] outChain = { selfCert }; KeyStore outStore = KeyStore.getInstance("PKCS12"); outStore.load(null, PASSWORD.toCharArray()); outStore.setKeyEntry("mykey", privateKey, PASSWORD.toCharArray(), outChain); OutputStream outputStream = new FileOutputStream(storeName); outStore.store(outputStream, PASSWORD.toCharArray()); outputStream.flush(); outputStream.close(); KeyStore inStore = KeyStore.getInstance("PKCS12"); inStore.load(new FileInputStream(storeName), PASSWORD.toCharArray()); } catch (Exception e) { e.printStackTrace(); throw new AssertionError(e.getMessage()); } } </code></pre> <p>I would advise you don't throw an <code>AssertionError</code>. This should only be used by Java itself to indicate an <code>assert</code> statement is false.</p>
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    1. COThankyou Jones, one small doubt. `outStore.load(null, PASSWORD.toCharArray());` and `outStore.setKeyEntry("mykey", privateKey, PASSWORD.toCharArray(), outChain);` why the both passwords we used? is it necessary for keystore file ? Can both the passwords different ?
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      1. USꜱᴜʀᴇꜱʜ ᴀᴛᴛᴀ
    2. CO@sᴜʀᴇsʜᴀᴛᴛᴀ Primarily, those lines are in my code example because they were in your original code. Check the documentation for `KeyStore` to understand their meaning.
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    3. COYes, I'm doing the same. :) Thanks for the help. If you get time please look in to this. http://stackoverflow.com/questions/19421571/providing-key-usage-to-x509certificate-generated-with-with-java-bouncycastle
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