[es] - String to string algoritam za enkripciju

dejanet
Beograd

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Re: String to string algoritam za enkripciju

^{31.01.2011. u 11:14 - pre 160 meseci}

Code:
import java.io.*;
import java.net.*;
import java.security.*;
import java.security.spec.*;

import java.util.Date;
import javax.crypto.*;
import javax.crypto.spec.*;
import sun.misc.*;
public class DesEncrypter {
    Cipher ecipher;
    Cipher dcipher;

    DesEncrypter(SecretKey key) {
        try {
            ecipher = Cipher.getInstance("DES");
            dcipher = Cipher.getInstance("DES");
            ecipher.init(Cipher.ENCRYPT_MODE, key);
            dcipher.init(Cipher.DECRYPT_MODE, key);

        } catch (javax.crypto.NoSuchPaddingException e) {
        } catch (java.security.NoSuchAlgorithmException e) {
        } catch (java.security.InvalidKeyException e) {
        }
    }

    public String encrypt(String str) {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");
            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);
            // Encode bytes to base64 to get a string
            return new sun.misc.BASE64Encoder().encode(enc);
            //return getHexString(enc);

        } catch (javax.crypto.BadPaddingException e) {
            System.out.println(e);
        } catch (IllegalBlockSizeException e) {
            System.out.println(e);
        } catch (UnsupportedEncodingException e) {
            System.out.println(e);
            //} catch (java.io.IOException e) {
            //    System.out.println(e);
        }
        return null;
    }

    public String decrypt(String str) {
        try {
            // Decode base64 to get bytes
            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
            // Decrypt
            byte[] utf8 = dcipher.doFinal(dec);

            // Decode using utf-8
            return new String(utf8, "UTF8");
            //return getHexString(utf8);
        } catch (javax.crypto.BadPaddingException e) {
            System.out.println(e);
        } catch (IllegalBlockSizeException e) {
            System.out.println(e);
        } catch (UnsupportedEncodingException e) {
            System.out.println(e);
        } catch (java.io.IOException e) {
            System.out.println(e);
        }
        return null;
    }

    public void testCrypt(){
        try {
            // Generate a temporary key. In practice, you would save this key.
            // See also e464 Encrypting with DES Using a Pass Phrase.
            SecretKey key = KeyGenerator.getInstance("DES").generateKey();

            // Create encrypter/decrypter class
            DesEncrypter encrypter = new DesEncrypter(key);

            // Encrypt
            String encrypted = encrypter.encrypt("Don't tell anybody!");
            System.out.println("encrypted="+encrypted);

            // Decrypt
            String decrypted = encrypter.decrypt(encrypted);
            System.out.println("decrypted="+decrypted);

        } catch (Exception e) {
        }
    }
}

Probaj ovaj DES crypter/decrypter, ja sam ga koristio za passworde u npr. user tabeli..
Takodje ti ne trebaju svi importi(zbog copy paste iz dela mog koda)..

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