import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MainActivity {
public static boolean verifyPassword( String input) {//这里修改下传入值
if (input.length() != 4) {
return false;
}
byte[] v = encodePassword(input);
byte[] p = "09042ec2c2c08c4cbece042681caf1d13984f24a".getBytes();
if (v.length != p.length) {
return false;
}
for (int i = 0; i < v.length; i++) {
if (v[i] != p[i]) {
return false;
}
}
return true;
}
private static byte[] encodePassword(String input) {
byte[] SALT = {95, 35, 83, 73, 75, 35, 95};
try {
StringBuilder sb = new StringBuilder();
sb.append((char) SALT[0]);
sb.append((char) SALT[1]);
for (int i = 0; i < input.length(); i++) {
sb.append((char) input.getBytes("iso-8859-1")[i]);
sb.append((char) SALT[i + 2]);
}
sb.append((char) SALT[6]);
byte[] bArr = new byte[0];
return SHA1(sb.toString()).getBytes("iso-8859-1");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
}
}
private static String convertToHex(byte[] data) {
StringBuffer buf = new StringBuffer();
for (int i = 0; i < data.length; i++) {
int halfbyte = (data[i] >>> 4) & 15;
int two_halfs = 0;
while (true) {
if (halfbyte < 0 || halfbyte > 9) {
buf.append((char) ((halfbyte - 10) + 97));
} else {
buf.append((char) (halfbyte + 48));
}
halfbyte = data[i] & 15;
int two_halfs2 = two_halfs + 1;
if (two_halfs >= 1) {
break;
}
two_halfs = two_halfs2;
}
}
return buf.toString();
}
private static String SHA1(String text) {
try {
MessageDigest md = MessageDigest.getInstance("SHA-1");
byte[] bArr = new byte[40];
md.update(text.getBytes("iso-8859-1"), 0, text.length());
return convertToHex(md.digest());
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e2) {
e2.printStackTrace();
}
return null;
}
//以上均为粘贴代码
public static void main(String[] strArr) {
int i;
for(i = 999;i<10000; i++) {
String sn = String.valueOf(i);
if (verifyPassword(sn)){
System.out.println("success:" + i);
break;
}
else {
System.out.println("fail:" + i);
}
}
}
}
