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100 lines
2.4 KiB
100 lines
2.4 KiB
public class Main
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{
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int kmatrix[][];
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int tmatrix[];
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int rmatrix[];
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public void div(String temp, int size)
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{
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while (temp.length() > size)
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{
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String substr = temp.substring(0, size);
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temp = temp.substring(size, temp.length());
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perf(substr);
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}
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if (temp.length() == size)
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perf(temp);
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else if (temp.length() < size)
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{
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for (int i = temp.length(); i < size; i++)
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temp = temp + 'x';
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perf(temp);
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}
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}
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public void perf(String text)
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{
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textconv(text);
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multiply(text.length());
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res(text.length());
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}
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public void keyconv(String key, int len)
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{
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kmatrix = new int[len][len];
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int c = 0;
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for (int i = 0; i < len; i++)
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{
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for (int j = 0; j < len; j++)
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{
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kmatrix[i][j] = ((int) key.charAt(c)) - 97;
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c++;
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}
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}
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}
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public void textconv(String text)
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{
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tmatrix = new int[text.length()];
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for (int i = 0; i < text.length(); i++)
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{
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tmatrix[i] = ((int) text.charAt(i)) - 97;
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}
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}
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public void multiply(int len)
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{
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rmatrix = new int[len];
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for (int i = 0; i < len; i++)
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{
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for (int j = 0; j < len; j++)
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{
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rmatrix[i] += kmatrix[i][j] * tmatrix[j];
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}
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rmatrix[i] %= 26;
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}
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}
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public void res(int len)
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{
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String res = "";
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for (int i = 0; i < len; i++)
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{
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res += (char) (rmatrix[i] + 97);
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}
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System.out.print(res);
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}
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public static void main(String[] args)
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{
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Main obj = new Main();
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System.out.println("Enter the plain text: ");
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String text = "fakeflag";
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System.out.println(text);
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System.out.println("Enter the key: ");
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String key = "gybnqkurp";
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System.out.println(key);
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double root = Math.sqrt(key.length());
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if (root != (long) root)
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System.out.println("Invalid key length.");
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else
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{
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int size = (int) root;
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System.out.println("Encrypted text = ");
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obj.keyconv(key, size);
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obj.div(text, size);
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}
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}
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}
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