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    <p>A PKCS #8 file containing an encrypted private key has the following ASN.1 structure:</p> <pre><code>EncryptedPrivateKeyInfo ::= SEQUENCE { encryptionAlgorithm EncryptionAlgorithmIdentifier, encryptedData EncryptedData } </code></pre> <p>Notice how the encrypted data is only part of the total data package. You need to include this data in a sequence along with the encryption algorithm identifier. Your code above produces only the <code>encryptedData</code> part.</p> <hr> <p>I would suggest you consider using BouncyCastle. It looks like they may have <a href="http://www.bouncycastle.org/jira/browse/BJA-243" rel="nofollow">improved support for PKCS#8 recently</a>. Here's some sample code:</p> <pre><code>KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA"); KeyPair keyPair = generator.generateKeyPair(); final PrivateKey privKey = keyPair.getPrivate(); JceOpenSSLPKCS8EncryptorBuilder builder = new JceOpenSSLPKCS8EncryptorBuilder(PKCS8Generator.PBE_SHA1_3DES); builder.setIterationCount(10000); builder.setPasssword("Hello, World!".toCharArray()); OutputEncryptor outputEncryptor = builder.build(); PKCS8Generator pkcs8Generator = new JcaPKCS8Generator(privKey, outputEncryptor); try (PemWriter writer = new PemWriter(new PrintWriter(System.out))) { writer.writeObject(pkcs8Generator); } </code></pre> <p>This will output an encrypted private key:</p> <pre> -----BEGIN ENCRYPTED PRIVATE KEY----- MIICrjAoBgoqhkiG9w0BDAEDMBoEFM1kXgdc0vzEhCwQG5G2wAaSA7POAgInEASC AoAkBPjKkNVpt9O9+Q63WMscX0eEiGyD6/kFwI+ZgH4/s98uKDHxWTB0fQ+HA+Iy gQC1b+QhT2HVR0DIB6lfhou4FrcJXBAqf4h0ybkfmE4xTfVQcCpgKm4uUC/FYjks dgTMajN9NHL06nUjd/0uVsM2bzbJHXlDmPRB0LdfvuxzcGN0Vvn13IJrjRnGwTGR nv6ZyE3gbjCRanINhMtCDMtg9Ydm7+DHC53YOeqbbhgO9/aJHpRzX/H6zLYp/oa0 GpHM6NzsTfABS8QyqR+EaoFad/XHvC9nKUDqm8LVjmKdlXrLDmpHQ4kxZqMIbijE /Pu2IfHB0jYYa93F2i0fKkIaeve4oo3/izBn0amXVnsPMnkyrIoUUaLzI/gb/419 vp+1kmAKsEFCRIDQlDCiR9CyuePOaR0d7EckVMDU0uR9MXYAV73Y3VRXe1votrQ/ 5Wi8ueio9TBDYj9wYYoYmRpz454HqJ/71k0xr5IJugJIJkUzNN9VkjK9rhgT0Vz5 wY/E1yZZepqCR1xrYgDuu/n4t63EERMo+BgkpKBMnWliU3QdQT2r4qBnma+c9lq8 IWb3y3Phl4LsX3DnLed1rUIOcQKiN2T9/yl+7eEtk8APkKuLK5DDDytgAcOQ1MIF 7Ie2939OG1c3mAwrdeOk20zf0SSbpX17MDmUoMwKsP9u8bqHahNoucjtuVSRtjSe 94xntc0fHkiIueApffxjErJOd2pmjGxJ7D2lkjV4G3AEg3vqFXk6E8nPIqIZL4qI 9KzmAFv88+QDIVTM5fheIOxZpeBkXtq2e19gCijiysqLDWL2CLuN4LVzhKCkJF6x QGN1FcLk95ikvhI/LEn6qrih -----END ENCRYPTED PRIVATE KEY----- </pre>
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    1. USDuncan Jones
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    1. COThe PKCS8Generator is now deprecated - you can use instead JcaPKCS8Generator with a JceOpenSSLPKCS8EncryptorBuilder to setup the passphrase protection.
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      1. USpjklauser
 

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