core/src/test/java/org/spongycastle/crypto/prng/test/FixedSecureRandomTest.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68

package org.spongycastle.crypto.prng.test;

import org.spongycastle.crypto.prng.FixedSecureRandom;
import org.spongycastle.util.Arrays;
import org.spongycastle.util.encoders.Hex;
import org.spongycastle.util.test.SimpleTest;

public class FixedSecureRandomTest
    extends SimpleTest
{
    byte[]  base = Hex.decode("deadbeefdeadbeef");
    byte[]  r1 = Hex.decode("cafebabecafebabe");
    byte[]  r2 = Hex.decode("ffffffffcafebabedeadbeef");

    public String getName()
    {
        return "FixedSecureRandom";
    }

    public void performTest()
        throws Exception
    {
        FixedSecureRandom fixed = new FixedSecureRandom(base);
        byte[]       buf = new byte[8];

        fixed.nextBytes(buf);

        if (!Arrays.areEqual(buf, base))
        {
            fail("wrong data returned");
        }

        fixed = new FixedSecureRandom(base);

        byte[] seed = fixed.generateSeed(8);

        if (!Arrays.areEqual(seed, base))
        {
            fail("wrong seed data returned");
        }

        if (!fixed.isExhausted())
        {
            fail("not exhausted");
        }

        fixed = new FixedSecureRandom(new byte[][] { r1, r2 });

        seed = fixed.generateSeed(12);

        if (!Arrays.areEqual(seed, Hex.decode("cafebabecafebabeffffffff")))
        {
            fail("wrong seed data returned - composite");
        }

        fixed.nextBytes(buf);

        if (!Arrays.areEqual(buf, Hex.decode("cafebabedeadbeef")))
        {
            fail("wrong data returned");
        }
    }

    public static void main(String[] args)
    {
        runTest(new FixedSecureRandomTest());
    }
}