将 Python 生成的哈希与 Java 中的原始密码进行比较时，盐修订无效

Question

所以我创建了一个数据库，用于存储用户信息和他们的哈希密码，该密码使用 Python 脚本使用bcrypt 模块进行哈希处理。

现在要使用我的 Java 客户端登录，我正在使用 JBCrypt 库作为我的 IntelliJ 项目中的 Maven 依赖项。它检索哈希并且数据库连接正常工作，唯一的问题是它抛出了这个错误：

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Invalid salt revision
    at org.mindrot.jbcrypt.BCrypt.hashpw(BCrypt.java:671)
    at org.mindrot.jbcrypt.BCrypt.checkpw(BCrypt.java:763)
    at mypackage.Login.validateUser(Login.java:81)
    at mypackage.Login.actionPerformed(Login.java:63)
    at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
    at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
    at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
    at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
    at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:269)
    at java.desktop/java.awt.Component.processMouseEvent(Component.java:6578)
    at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3343)
    at java.desktop/java.awt.Component.processEvent(Component.java:6343)
    at java.desktop/java.awt.Container.processEvent(Container.java:2259)
    at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4961)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2317)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4793)
    at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
    at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4539)
    at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4480)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2303)
    at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2758)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4793)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:766)
    at java.desktop/java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:717)
    at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:711)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:89)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:99)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:739)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:737)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:89)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:736)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:199)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

检查代码如下：

String dbHash = results.getString("password");
System.out.println(dbHash);
boolean result = BCrypt.checkpw(new String(passwordField.getPassword()), dbHash);

编辑： Python 模块脚本中散列密码和原始密码的示例如下：

Raw:    zO/15;w|c'*uftH)
Hashed: $2b$12$7Y4ZmORuoH0dziYSg8dpd.PfvWQx2QPcoiRoGWg.HKfhuN6evEZnO

**编辑：** 我注意到这是因为 JBCrypt 似乎不支持大于 $2a 哈希的任何内容。我找不到 Python 的 bcrypt 模块文档，因此我无法确定是否可以在 Python 代码中使用 $2a 哈希。

Answer 1

问题是JBCrypt 的问题。它已过时（它只能验证 $2a 哈希。

因此，为了解决这个问题，我不得不更改 Python 脚本以生成使用 $2a 前缀的盐：

可调整前缀

bcrypt 的另一个功能是可调节的 前缀让您定义您将保持兼容的库。 要对此进行调整，请将 2a 或 2b（默认值）传递给 bcrypt.gensalt(prefix=b"2b") 作为字节对象。

https://pypi.python.org/pypi/bcrypt/3.1.0

Answer 2

从源代码看来，异常来自checking the format of the hashed password：

    if (salt.charAt(0) != '$' || salt.charAt(1) != '2')
        throw new IllegalArgumentException ("Invalid salt version");
    if (salt.charAt(2) == '$')
        off = 3;
    else {
        minor = salt.charAt(2);
        if (minor != 'a' || salt.charAt(3) != '$')
            throw new IllegalArgumentException ("Invalid salt revision");
        off = 4;
    }

所以我的猜测是 dbHash 出于某种原因与格式不匹配。要么它是由不兼容的版本生成的。或者它实际上没有散列。或为空。