Java版Discuz! AuthCode
package discuz;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Calendar;
import java.util.Random;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class AuthCode {
static BASE64Encoder encoder = new BASE64Encoder();
static BASE64Decoder decoder = new BASE64Decoder();
public enum DiscuzAuthcodeMode {
Encode, Decode
};
public static void main(String[] args){
System.out.print(”["+authcodeDecode("672d+9y5HQ0zqsONrBpSv5HwfTBASYjqVPyQ4O3RMN7xQcg", "soonyo")+"]“);
}
public static String CutString(String str, int startIndex, int length){
if (startIndex >= 0) {
if (length < 0) {
length = length * -1;
if(startIndex – length < 0) {
length = startIndex;
startIndex = 0;
} else {
startIndex = startIndex – length;
}
}
if (startIndex > str.length()) {
return “”;
}
} else {
if (length < 0) {
return “”;
} else {
if (length + startIndex > 0) {
length = length + startIndex;
startIndex = 0;
} else {
return “”;
}
}
}
if (str.length() – startIndex < length) {
length = str.length() – startIndex;
}
return str.substring(startIndex, startIndex + length);
}
public static String CutString(String str, int startIndex) {
return CutString(str, startIndex, str.length());
}
public static String MD5(String pass) {
byte[] defaultBytes = pass.getBytes();
try{
MessageDigest algorithm = MessageDigest.getInstance(”MD5″);
algorithm.reset();
algorithm.update(defaultBytes);
byte messageDigest[] = algorithm.digest();
StringBuffer hexString = new StringBuffer();
for (int i=0;i<messageDigest.length;i++) {
String hex = Integer.toHexString(0xFF & messageDigest[i]);
if(hex.length()==1)
hexString.append(”0″ );
hexString.append(hex);
}
return hexString.toString();
}
catch(NoSuchAlgorithmException nsae){
}
return “”;
}
public static boolean StrIsNullOrEmpty(String str) {
//#if NET1
if (str == null || str.trim().equals(”")) {
return true;
}
return false;
}
static private byte[] GetKey(byte[] pass, int kLen) {
byte[] mBox = new byte[kLen];
for (int i = 0; i < kLen; i++) {
mBox[i] = (byte) i;
}
int j = 0;
for (int i = 0; i < kLen; i++) {
j = (j + (int) ((mBox[i] + 256) % 256) + pass[i % pass.length])
% kLen;
byte temp = mBox[i];
mBox[i] = mBox[j];
mBox[j] = temp;
}
return mBox;
}
public static String RandomString(int lens) {
String[] CharArray = {”a”, “b”, “c”, “d”, “e”, “f”, “g”, “h”, “j”, “k”, “l”, “m”, “n”, “o”, “p”, “q”, “r”, “s”, “t”, “u”, “v”, “w”, “x”, “y”, “z”, “0″ , “1″ , “2″ , “3″ , “4″ , “5″ , “6″ , “7″ , “8″ , “9″ };
int clens = CharArray.length;
String sCode = “”;
Random random = new Random();
for (int i = 0; i < lens; i++) {
sCode += CharArray[Math.abs(random.nextInt(clens))];
}
return sCode;
}
public static String authcodeEncode(String source, String key, int expiry) {
return authcode(source, key, DiscuzAuthcodeMode.Encode, expiry);
}
public static String authcodeEncode(String source, String key) {
return authcode(source, key, DiscuzAuthcodeMode.Encode, 0);
}
public static String authcodeDecode(String source, String key) {
return authcode(source, key, DiscuzAuthcodeMode.Decode, 0);
}
private static String authcode(String source, String key,
DiscuzAuthcodeMode operation, int expiry) {
try {
if (source == null || key == null) {
return “”;
}
int ckey_length = 4;
String keya, keyb, keyc, cryptkey, result;
key = MD5(key);
keya = MD5(CutString(key, 0, 16));
keyb = MD5(CutString(key, 16, 16));
keyc = ckey_length > 0 ? (operation == DiscuzAuthcodeMode.Decode ? CutString(
source, 0, ckey_length)
: RandomString(ckey_length))
: “”;
cryptkey = keya + MD5(keya + keyc);
if (operation == DiscuzAuthcodeMode.Decode) {
byte[] temp;
temp = decoder.decodeBuffer(CutString(source, ckey_length));
result = new String(RC4(temp, cryptkey));
if (CutString(result, 10, 16).equals(CutString(MD5(CutString(result, 26) + keyb), 0, 16))) {
return CutString(result, 26);
} else {
temp = decoder.decodeBuffer(CutString(source+”=”, ckey_length));
result = new String(RC4(temp, cryptkey));
if (CutString(result, 10, 16).equals(CutString(MD5(CutString(result, 26) + keyb), 0, 16))) {
return CutString(result, 26);
} else {
temp = decoder.decodeBuffer(CutString(source+”==”, ckey_length));
result = new String(RC4(temp, cryptkey));
if (CutString(result, 10, 16).equals(CutString(MD5(CutString(result, 26) + keyb), 0, 16))) {
return CutString(result, 26);
}else{
return “”;
}
}
}
} else {
source = “0000000000″ + CutString(MD5(source + keyb), 0, 16)
+ source;
byte[] temp = RC4(source.getBytes(”GBK”), cryptkey);
return keyc + encoder.encodeBuffer(temp);
}
} catch (Exception e) {
return “”;
}
}
private static byte[] RC4(byte[] input, String pass) {
if (input == null || pass == null)
return null;
byte[] output = new byte[input.length];
byte[] mBox = GetKey(pass.getBytes(), 256);
int i = 0;
int j = 0;
for (int offset = 0; offset < input.length; offset++) {
i = (i + 1) % mBox.length;
j = (j + (int) ((mBox[i] + 256) % 256)) % mBox.length;
byte temp = mBox[i];
mBox[i] = mBox[j];
mBox[j] = temp;
byte a = input[offset];
byte b = mBox[(toInt(mBox[i]) + toInt(mBox[j])) % mBox.length];
output[offset] = (byte) ((int) a ^ (int) toInt(b));
}
return output;
}
public static int toInt(byte b) {
return (int) ((b + 256) % 256);
}
public long getUnixTimestamp() {
Calendar cal = Calendar.getInstance();
return cal.getTimeInMillis() / 1000;
}
}
记录一下，挺实有的函数，加解密从方式上看貌似与PHP版不同，但结果出来是一样滴~
