Method addBin

src/main/java/com/thealgorithms/ciphers/Blowfish.java:1140–1148

This method returns addition of two hexadecimal numbers passed as parameters and moded with 2^32 @param String a and b are hexadecimal numbers @return String object which is a is addition that is then moded with 2^32 of hex numbers passed as parameters

(String a, String b)

     *     passed as parameters
     */
    private String addBin(String a, String b) {
        String ans = "";
        long n1 = Long.parseUnsignedLong(a, 16);
        long n2 = Long.parseUnsignedLong(b, 16);
        n1 = (n1 + n2) % modVal;
        ans = Long.toHexString(n1);
        ans = "00000000" + ans;
        return ans.substring(ans.length() - 8);
    }

    /*F-function splits the 32-bit input into four 8-bit quarters
         and uses the quarters as input to the S-boxes.