SHA256

import java.util.*;

public class SHA256 {
    public static char[] CurrentBinaryString;
    public static char[] PreviousBinaryString;
    public static char[] nameToCharArr;
    public static int currentDEC;
    public static char currentASCII;


    public static void binToDec() {
        String currBIN = String.valueOf(CurrentBinaryString);

        currentDEC = Integer.parseInt(currBIN, 2);
        if (currentDEC < 33 || currentDEC > 126) {
            Random random = new Random();
            int min = 33;
            int max = 127;
            currentDEC = random.nextInt(max - min + 1) + min;
        }
        System.out.println(currentDEC);
    }

    public static void decToASCII() {
        currentASCII = (char) currentDEC;
    }

    public static void ASCIIToNameCharArr(int index) {
        nameToCharArr[index] = currentASCII;
    }

    public static void XOR() {
        for (int i = 0; i < CurrentBinaryString.length; i++) {
            if (CurrentBinaryString[i] == PreviousBinaryString[i]) {
                CurrentBinaryString[i] = '0';
            } else {
                CurrentBinaryString[i] = '1';
            }
        }
    }


    public static void RORandSHR(boolean rorOrshr, int rotations) {
        if (!rorOrshr) {

            for (int i = rotations; i > 0; i--) {
                char last = CurrentBinaryString[CurrentBinaryString.length - 1];
                for (int j = CurrentBinaryString.length - 1; j > 0; j--) {
                    CurrentBinaryString[j] = CurrentBinaryString[j - 1];
                }
                CurrentBinaryString[0] = last;
            }
        } else {
            for (int i = rotations; i > 0; i--) {
                for (int j = CurrentBinaryString.length - 1; j > 0; j--) {
                    CurrentBinaryString[j] = CurrentBinaryString[j - 1];
                }
                CurrentBinaryString[0] = '0';
            }

        }
    }

    public static void addBytes() {
        char ele = '0';
        int index = 0;
        char[] tempArr = new char[CurrentBinaryString.length + 1];
        int j = 0;
        for (int i = 0; i < tempArr.length; i++) {
            if (i == index) {
                tempArr[i] = ele;
            } else {
                tempArr[i] = CurrentBinaryString[j];
                j++;
            }
        }
        CurrentBinaryString = tempArr;
    }


    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("Input string: ");
        String Name = scan.nextLine();
        nameToCharArr = Name.toCharArray();
        int arrLength = nameToCharArr.length;
        int index = 0;
        for (int i = 0; i < arrLength; i++) {
            int ascII = nameToCharArr[i];
            PreviousBinaryString = new char[arrLength];
            CurrentBinaryString = new char[arrLength];
            CurrentBinaryString = Integer.toBinaryString(ascII).toCharArray();
            PreviousBinaryString = Arrays.copyOf(CurrentBinaryString, arrLength);
            if (CurrentBinaryString.length < 8) {
                while (CurrentBinaryString.length < 8) {
                    addBytes();
                }
            }
            int rotations = 13;
            PreviousBinaryString = Arrays.copyOf(CurrentBinaryString, CurrentBinaryString.length);
            RORandSHR(false, rotations);
            XOR();
            PreviousBinaryString = Arrays.copyOf(CurrentBinaryString, CurrentBinaryString.length);
            rotations = 7;
            RORandSHR(false, rotations);
            XOR();
            int shifts = 3;
            RORandSHR(true, shifts);
            binToDec();
            decToASCII();
            ASCIIToNameCharArr(index);
            index++;
            System.out.println(Arrays.toString(CurrentBinaryString));
            System.out.println(currentASCII);


        }
        System.out.println(Arrays.toString(nameToCharArr));
    }
}