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我需要哈希密码以存储在数据库中.我怎么能用Java做到这一点？

我希望获取纯文本密码,添加随机盐,然后将salt和散列密码存储在数据库中.

然后,当用户想要登录时,我可以获取他们提交的密码,从他们的帐户信息中添加随机盐,哈希并查看它是否等于存储的哈希密码及其帐户信息.

我想在Android Marketplace中使用新的许可(LVL),但是我遇到了AESObfuscator的性能问题.具体来说,构造函数需要几秒钟才能在设备上运行(仿真器上的纯粹痛苦).由于此代码需要运行以检查缓存的许可证响应,因此在启动时检查许可证会严重阻碍.

运行LVL示例应用程序,这是我对AESObfuscator构造函数的野蛮风格分析:

public AESObfuscator(byte[] salt, String applicationId, String deviceId) {
        Log.w("AESObfuscator", "constructor starting");
        try {
            Log.w("AESObfuscator", "1");
            SecretKeyFactory factory = SecretKeyFactory.getInstance(KEYGEN_ALGORITHM);
            Log.w("AESObfuscator", "2");
            KeySpec keySpec =
                new PBEKeySpec((applicationId + deviceId).toCharArray(), salt, 1024, 256);
            Log.w("AESObfuscator", "3");
            SecretKey tmp = factory.generateSecret(keySpec);
            Log.w("AESObfuscator", "4");
            SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
            Log.w("AESObfuscator", "5");
            mEncryptor = Cipher.getInstance(CIPHER_ALGORITHM);
            Log.w("AESObfuscator", "6");
            mEncryptor.init(Cipher.ENCRYPT_MODE, secret, new IvParameterSpec(IV));
            Log.w("AESObfuscator", "7");
            mDecryptor = Cipher.getInstance(CIPHER_ALGORITHM);
            Log.w("AESObfuscator", "8");
            mDecryptor.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(IV));
        } catch (GeneralSecurityException e) {
            // This can't happen on …