Цитата:
Сообщение от Warencense
NewCrypt.verifyChecksum(byte[]); - смотри здесь.
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Посмотрел этот класс.. Не знаю что с ним делать?
Код:
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.io.IOException;
public class NewCrypt
{
private static final Logger _log = LogManager.getLogger(NewCrypt.class.getName());
BlowfishEngine _crypt;
BlowfishEngine _decrypt;
public NewCrypt(final byte[] blowfishKey)
{
_crypt = new BlowfishEngine();
_crypt.init(true, blowfishKey);
_decrypt = new BlowfishEngine();
_decrypt.init(false, blowfishKey);
}
public NewCrypt(final String key)
{
this(key.getBytes());
}
public static boolean verifyChecksum(final byte[] raw)
{
return NewCrypt.verifyChecksum(raw, 0, raw.length);
}
public static boolean verifyChecksum(final byte[] raw, final int offset, final int size)
{
// check if size is multiple of 4 and if there is more then only the checksum
if ((size & 3) != 0 || size <= 4)
return false;
long chksum = 0;
final int count = size - 4;
long check = -1;
int i;
for (i = offset; i < count; i += 4)
{
check = raw[i] & 0xff;
check |= raw[i + 1] << 8 & 0xff00;
check |= raw[i + 2] << 0x10 & 0xff0000;
check |= raw[i + 3] << 0x18 & 0xff000000;
chksum ^= check;
}
check = raw[i] & 0xff;
check |= raw[i + 1] << 8 & 0xff00;
check |= raw[i + 2] << 0x10 & 0xff0000;
check |= raw[i + 3] << 0x18 & 0xff000000;
return check == chksum;
}
public static void appendChecksum(final byte[] raw)
{
NewCrypt.appendChecksum(raw, 0, raw.length);
}
public static void appendChecksum(final byte[] raw, final int offset, final int size)
{
long chksum = 0;
final int count = size - 4;
long ecx;
int i;
for (i = offset; i < count; i += 4)
{
ecx = raw[i] & 0xff;
ecx |= raw[i + 1] << 8 & 0xff00;
ecx |= raw[i + 2] << 0x10 & 0xff0000;
ecx |= raw[i + 3] << 0x18 & 0xff000000;
chksum ^= ecx;
}
ecx = raw[i] & 0xff;
ecx |= raw[i + 1] << 8 & 0xff00;
ecx |= raw[i + 2] << 0x10 & 0xff0000;
ecx |= raw[i + 3] << 0x18 & 0xff000000;
raw[i] = (byte) (chksum & 0xff);
raw[i + 1] = (byte) (chksum >> 0x08 & 0xff);
raw[i + 2] = (byte) (chksum >> 0x10 & 0xff);
raw[i + 3] = (byte) (chksum >> 0x18 & 0xff);
}
/**
* Packet is first XOR encoded with <code>key</code> Then, the last 4 bytes are overwritten with the the XOR "key". Thus this assume that there is enough room for the key to fit without overwriting data.
* @param raw The raw bytes to be encrypted
* @param key The 4 bytes (int) XOR key
*/
public static void encXORPass(final byte[] raw, final int key)
{
NewCrypt.encXORPass(raw, 0, raw.length, key);
}
/**
* Packet is first XOR encoded with <code>key</code> Then, the last 4 bytes are overwritten with the the XOR "key". Thus this assume that there is enough room for the key to fit without overwriting data.
* @param raw The raw bytes to be encrypted
* @param offset The begining of the data to be encrypted
* @param size Length of the data to be encrypted
* @param key The 4 bytes (int) XOR key
*/
public static void encXORPass(final byte[] raw, final int offset, final int size, final int key)
{
final int stop = size - 8;
int pos = 4 + offset;
int edx;
int ecx = key; // Initial xor key
while (pos < stop)
{
edx = raw[pos] & 0xFF;
edx |= (raw[pos + 1] & 0xFF) << 8;
edx |= (raw[pos + 2] & 0xFF) << 16;
edx |= (raw[pos + 3] & 0xFF) << 24;
ecx += edx;
edx ^= ecx;
raw[pos++] = (byte) (edx & 0xFF);
raw[pos++] = (byte) (edx >> 8 & 0xFF);
raw[pos++] = (byte) (edx >> 16 & 0xFF);
raw[pos++] = (byte) (edx >> 24 & 0xFF);
}
raw[pos++] = (byte) (ecx & 0xFF);
raw[pos++] = (byte) (ecx >> 8 & 0xFF);
raw[pos++] = (byte) (ecx >> 16 & 0xFF);
raw[pos++] = (byte) (ecx >> 24 & 0xFF);
}
public byte[] decrypt(final byte[] raw) throws IOException
{
final byte[] result = new byte[raw.length];
final int count = raw.length / 8;
for (int i = 0; i < count; i++)
{
_decrypt.processBlock(raw, i * 8, result, i * 8);
}
return result;
}
public void decrypt(final byte[] raw, final int offset, final int size) throws IOException
{
final byte[] result = new byte[size];
final int count = size / 8;
for (int i = 0; i < count; i++)
{
_decrypt.processBlock(raw, offset + i * 8, result, i * 8);
}
// TODO can the crypt and decrypt go direct to the array
System.arraycopy(result, 0, raw, offset, size);
}
public byte[] crypt(final byte[] raw) throws IOException
{
final int count = raw.length / 8;
final byte[] result = new byte[raw.length];
for (int i = 0; i < count; i++)
{
_crypt.processBlock(raw, i * 8, result, i * 8);
}
return result;
}
public void crypt(final byte[] raw, final int offset, final int size) throws IOException
{
final int count = size / 8;
final byte[] result = new byte[size];
for (int i = 0; i < count; i++)
{
_crypt.processBlock(raw, offset + i * 8, result, i * 8);
}
// TODO can the crypt and decrypt go direct to the array
System.arraycopy(result, 0, raw, offset, size);
}
}