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Add option to randomize RandomData #155

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Add option to randomize RandomData #155

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15 changes: 15 additions & 0 deletions src/main/java/com/licel/jcardsim/crypto/RandomDataImpl.java
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,9 @@
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.prng.DigestRandomGenerator;
import org.bouncycastle.crypto.prng.RandomGenerator;
import org.bouncycastle.util.encoders.Hex;

import java.security.SecureRandom;

/**
* Implementation <code>RandomData</code> based
Expand All @@ -34,6 +37,18 @@ public class RandomDataImpl extends RandomData {
public RandomDataImpl(byte algorithm) {
this.algorithm = algorithm;
this.engine = new DigestRandomGenerator(new SHA1Digest());

final String randomSeed = System.getProperty("com.licel.jcardsim.randomdata.seed");
final String doSecureRandom = System.getProperty("com.licel.jcardsim.randomdata.secure", "0");
if (randomSeed != null){
this.engine.addSeedMaterial(Hex.decode(randomSeed));
}
else if ("1".equals(doSecureRandom)){
byte[] seed = new byte[32];
SecureRandom randomGenerator = new SecureRandom();
randomGenerator.nextBytes(seed);
this.engine.addSeedMaterial(seed);
}
}

public void generateData(byte[] buffer, short offset, short length) throws CryptoException {
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