import java.text.DecimalFormat;
import java.util.Calendar;
import java.util.TimeZone;
public class OTPSecurity {
public boolean CheckOTP(String input, String key) {
System.out.println("Inputted input is " + input);
System.out.println("Inputted key is " + key);
int i = 5;
while (true) {
int i2 = i - 1;
if (i <= -1) {
return false;
}
StringBuilder sb = new StringBuilder(String.valueOf(key));
sb.append(GetDateString(i2));
System.out.println("Offset is:" + i2);
System.out.println("Correct key is:" + MakeHashCode(sb.toString()));
if (input.equalsIgnoreCase(Integer.toString(MakeHashCode(sb.toString())))) {
return true;
}
i = i2;
}
}
private String GetDateString(int min) {
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
cal.add(12, min * -1);
StringBuilder sb = new StringBuilder(String.valueOf(new DecimalFormat("00").format((long) (cal.get(1) - 2000))));
sb.append(new DecimalFormat("00").format((long) (cal.get(2) + 1)));
StringBuilder sb2 = new StringBuilder(String.valueOf(sb.toString()));
sb2.append(new DecimalFormat("00").format((long) cal.get(12)));
StringBuilder sb3 = new StringBuilder(String.valueOf(sb2.toString()));
sb3.append(new DecimalFormat("00").format((long) cal.get(5)));
StringBuilder sb4 = new StringBuilder(String.valueOf(sb3.toString()));
sb4.append(new DecimalFormat("00").format((long) cal.get(11)));
return sb4.toString();
}
private int MakeHashCode(String arg) {
int nHashValue = 0;
for (int i = 0; i < arg.length(); i++) {
nHashValue = (nHashValue << 5) + nHashValue + arg.charAt(i);
}
if (nHashValue < 0) {
return nHashValue * -1;
}
return nHashValue;
}
public static void main(String[] args) {
OTPSecurity OTP = new OTPSecurity();
System.out.println("Unix Time output of input: " + OTP.MakeHashCode("yy182"));
System.out.println(OTP.CheckOTP("", "yy182"));
}
}
Compile and Execute Java Online (JDK 1.8.0)
Compile and Execute Java Online (JDK 1.8.0) helps you to Edit, Run and Share your Java Code directly from your browser. This development environment provides you version JDK 1.8.0.
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| Shortcut | Description |
|---|
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| Shortcut | Description |
|---|
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| Ctrl + Z | Undo Editing |
| Ctrl + Y | Redo Editing |
| Ctrl + A | Select All Text |
| Ctrl + X | Cut Selected Text |
| Ctrl + C | Copy Selected Text |
| Ctrl + V | Paste Copied Text |
| Ctrl + F | Search Text |
| Ctrl + H | Replace Text |
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