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| CodeSonar® 9.0p0 Hot Tips | CONFIDENTIAL | CodeSecure Inc |
The same random seed is used multiple times.
If two random generators are initialized with the same seed, they will produce the same predictable sequence of numbers.
See also Hardcoded Random Seed (Java).
| Class Name | Use of Same Seed (Java) | |||
|---|---|---|---|---|
| Significance | security | |||
| Mnemonic | JAVA.INSEC.SS | |||
| Categories |
|
|||
| Availability | Available for Java only. |
|||
| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Use of Same Seed (Java)" |
Japanese (ja)
public class SameSeed {
public void randomPrint() {
final byte[] SEED = new byte[] {0x01, 0x02, 0x03, 0x04, 0x05};
SecureRandom secureRandom1 = new SecureRandom();
secureRandom1.setSeed(SEED);
SecureRandom secureRandom2 = new SecureRandom();
secureRandom2.setSeed(SEED); // 'Use of Same Seed (Java)' warning issued here
System.out.println("" + secureRandom1.nextInt());
System.out.println("" + secureRandom2.nextInt());
}
}
Use a less predictable seed, or don't specify a seed at all.
The following configuration file parameters affect checks for this warning class.