Using Java Card 's RandonData.getInstance - javacard

Question

My applet crashed when I call the following line of code
RandomData rd = RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);
I get the following output:
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)
What is the cause/reason for the crash. Notice: I am new to the java smart cart ecosystem.
What's up with Off Card Installer sending create request

Answer 1

Your card probably does not support RandomData.ALG_SECURE_RANDOM.
To prove it, try surrounding the line with a try-catch block like this:
try {
RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);
} catch(CryptoException e) {
if (e.getReason() != CryptoException.NO_SUCH_ALGORITHM) {
throw e;
}
}
You will have to use RandomData.ALG_PSEUDO_RANDOM instead. Unfortunately, the security of this algorithm is not guaranteed, so you must be very careful and you should contact your card vendor.