使用 Java 卡的 RandonData.getInstance

Question

当我调用以下代码行时，我的小程序崩溃了

RandomData rd = RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);

我得到以下输出：

OffCard Installer [v3.0.2]  
    Copyright (c) 2009 Sun Microsystems, Inc.  
    All rights reserved.  
    Use is subject to license terms.  
[ INFO: ] [Creating an instance of ClassicApplet1 with instance ID //aid/E96473AB62/DF on http://localhost:8019/cardmanager]  
[ INFO: ] "Off Card Installer validating create information"  
[ INFO: ] "Off Card Installer preparing create information"  
[ INFO: ] "Off Card Installer sending create request"  
[ INFO: ] Create failed: null  
run-client:  
run-script:  
Invoking apdutool on C:\Users\Daniel\Documents\NetBeansProjects\ClassicApplet1/scripts/classicapplet1.scr  
ApduTool [v3.0.2]  
    Copyright (c) 2009 Sun Microsystems, Inc.  
    All rights reserved.  
    Use is subject to license terms.  
Opening connection to localhost on port 9025.  
Connected.  
Received ATR = 0x3b 0xf0 0x11 0x00 0xff 0x00   
CLA: 00, INS: a4, P1: 04, P2: 00, Lc: 06, e9, 64, 73, ab, 62, df, Le: 00, SW1: 69, SW2: 99  
run-for-debug:  
BUILD SUCCESSFUL (total time: 25 seconds)

什么是崩溃cause/reason。注意：我是 java 智能购物车生态系统的新手。 Off Card Installer sending create request

怎么了

Answer 1

您的网卡可能不支持RandomData.ALG_SECURE_RANDOM。

为了证明这一点，尝试用这样的 try-catch 块包围该行：

try {
    RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);
} catch(CryptoException e) {
    if (e.getReason() != CryptoException.NO_SUCH_ALGORITHM) {
         throw e;
    }
}

您将不得不使用 RandomData.ALG_PSEUDO_RANDOM。不幸的是，这个算法的安全性没有保证，所以你必须非常小心，你应该联系你的卡供应商。

使用 Java 卡的 RandonData.getInstance

Using Java Card 's RandonData.getInstance

javacard