@Test
public void testCollision() throws Exception {
File fileDir = TestUtils.createTempDir();
File dataFile = new File(fileDir + File.separator + "0_0_0.data");
dataFile.deleteOnExit();
FileOutputStream fw = new FileOutputStream(dataFile.getAbsoluteFile());
DataOutputStream outputStream = new DataOutputStream(fw);
/*
* 4dc968ff0ee35c209572d4777b721587d36fa7b21bdc56b74a3dc0783e7b9518afbfa200a8284bf36e8e4b55b35f427593d849676da0d1555d8360fb5f07fea2
* and the (different by two bits)
* 4dc968ff0ee35c209572d4777b721587d36fa7b21bdc56b74a3dc0783e7b9518afbfa202a8284bf36e8e4b55b35f427593d849676da0d1d55d8360fb5f07fea2
* both have MD5 hash 008ee33a9d58b51cfeb425b0959121c9
*/
String[] md5collision = {
"4dc968ff0ee35c209572d4777b721587d36fa7b21bdc56b74a3dc0783e7b9518afbfa200a8284bf36e8e4b55b35f427593d849676da0d1555d8360fb5f07fea2",
"4dc968ff0ee35c209572d4777b721587d36fa7b21bdc56b74a3dc0783e7b9518afbfa202a8284bf36e8e4b55b35f427593d849676da0d1d55d8360fb5f07fea2"
};
outputStream.writeShort(2);
for (int i = 0; i < 2; i++) {
String input = md5collision[i];
byte[] hexInput = ByteUtils.fromHexString(input);
outputStream.writeInt(hexInput.length);
outputStream.writeInt(hexInput.length);
outputStream.write(hexInput);
outputStream.write(hexInput);
}
outputStream.close();
fw.close();
File indexFile = new File(fileDir + File.separator + "0_0_0.index");
indexFile.createNewFile();
indexFile.deleteOnExit();
ChunkedFileSet fileSet =
new ChunkedFileSet(
fileDir,
getTempStrategy(),
NODE_ID,
VoldemortConfig.DEFAULT_RO_MAX_VALUE_BUFFER_ALLOCATION_SIZE);
for (int i = 0; i < 2; i++) {
String input = md5collision[i];
byte[] hexInput = ByteUtils.fromHexString(input);
byte[] hexValue = fileSet.readValue(hexInput, 0, 0);
Assert.assertArrayEquals(hexInput, hexValue);
}
}
