main.java

IDEA is a symetric method to crypt message or document.

package idea;

public class Main {

    public static void main(String[] args) {
          
          String cle_String="0123456789ABCDEF0123456789ABCDEF";
          idea IDEA=new idea(cle_String);
          
          String plaintext="Je suis Salem Mathlouthi. Ceci est un test de la m閠hode IDEA.";
          int plaintext_length=plaintext.length();
          if(plaintext_length%8 !=0)for(int i=0;i<(8-plaintext_length%8);i++)plaintext+=" ";
          byte[]plaintext_bytes=plaintext.getBytes();
         
          byte[]ciphertext_bytes=new byte[plaintext_bytes.length];
          byte[]ciphertext2plaintext_bytes=new byte[plaintext_bytes.length];
          byte []b=new byte[8];       
          for(int i=0;i<plaintext_bytes.length;i+=8){
              System.arraycopy(plaintext_bytes,i,b,0,8);
              b=IDEA.chiffre(b);
              System.arraycopy(b,0,ciphertext_bytes,i,8);
          }
     
          for(int i=0;i<ciphertext_bytes.length;i+=8){
              System.arraycopy(ciphertext_bytes,i,b,0,8);
              b=IDEA.dechiffre(b);
              System.arraycopy(b,0,ciphertext2plaintext_bytes,i,8);
          }
          
          System.out.println(new String(ciphertext2plaintext_bytes));
    }

}