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/**
* @test
* @bug 4844847
* @summary Test the Cipher.update/doFinal(ByteBuffer, ByteBuffer) methods
* @author Andreas Sterbenz
*/
import java.util.*;
import java.nio.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
public class ByteBuffers {
public static void main(String[] args) throws Exception {
Provider p = Security.getProvider("SunJCE");
Random random = new Random();
int n = 10 * 1024;
byte[] t = new byte[n];
random.nextBytes(t);
byte[] keyBytes = new byte[8];
random.nextBytes(keyBytes);
SecretKey key = new SecretKeySpec(keyBytes, "DES");
Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] outBytes = cipher.doFinal(t);
// create ByteBuffers for input (i1, i2, i3) and fill them
ByteBuffer i0 = ByteBuffer.allocate(n + 256);
i0.position(random.nextInt(256));
i0.limit(i0.position() + n);
ByteBuffer i1 = i0.slice();
i1.put(t);
ByteBuffer i2 = ByteBuffer.allocateDirect(t.length);
i2.put(t);
i1.clear();
ByteBuffer i3 = i1.asReadOnlyBuffer();
ByteBuffer o0 = ByteBuffer.allocate(n + 512);
o0.position(random.nextInt(256));
o0.limit(o0.position() + n + 256);
ByteBuffer o1 = o0.slice();
ByteBuffer o2 = ByteBuffer.allocateDirect(t.length + 256);
crypt(cipher, i1, o1, outBytes, random);
crypt(cipher, i2, o1, outBytes, random);
crypt(cipher, i3, o1, outBytes, random);
crypt(cipher, i1, o2, outBytes, random);
crypt(cipher, i2, o2, outBytes, random);
crypt(cipher, i3, o2, outBytes, random);
System.out.println("All tests passed");
}
private static void crypt(Cipher cipher, ByteBuffer in, ByteBuffer out, byte[] outBytes, Random random) throws Exception {
in.clear();
out.clear();
out.put(new byte[out.remaining()]);
out.clear();
int lim = in.limit();
in.limit(random.nextInt(lim));
cipher.update(in, out);
if (in.hasRemaining()) {
throw new Exception("Buffer not consumed");
}
in.limit(lim);
cipher.doFinal(in, out);
if (in.hasRemaining()) {
throw new Exception("Buffer not consumed");
}
out.flip();
byte[] b = new byte[out.remaining()];
out.get(b);
if (Arrays.equals(outBytes, b) == false) {
throw new Exception("Encryption output mismatch");
}
}
}