About PHP and JAVA 3DES encryption issues

Question

I want to write an encryption class in Java using PHP, but I saw this way of writing Java and it gave me a headache. Totally illogical. I found a complete class and wanted to refer to it. After many experiments, I could not translate the encryption class I uploaded into PHP. Please help me. Thanks.

/**

• 3Des help class

• */

public class ThreeDESUtil {

private static final String Algorithm = "DESede"; // 定义 加密算法,可用
                                                    // DES,DESede,Blowfish
private static byte[] keybyte = { 0x11, 0x28, 0x4F, 0x58, (byte) 0x88,
        0x10, 0x40, 0x38, 0x28, 0x25, 0x79, 0x51, (byte) 0xCB, (byte) 0xDD,
        0x55, 0x66, 0x77, 0x29, 0x74, (byte) 0x98, 0x30, 0x40, 0x36,
        (byte) 0xE2 }; // 24字节的密钥

public static String encryptMode(String src) {
    String encrypt = null;
    try {
        byte[] ret = encryptMode(src.getBytes("UTF-8"));
        encrypt = new String(Base64.encode(ret));
        encrypt = encrypt.replaceAll("=", "Q");
    } catch (Exception e) {
        logger.error("ThreeDES Error");
    }
    return encrypt;
}



/**
 * 加密
 * 
 * @param src
 * @return
 */
private static byte[] encryptMode(byte[] src) {
    try {
        // 生成密钥
        SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
        // 加密
        Cipher c1 = Cipher.getInstance(Algorithm);
        c1.init(Cipher.ENCRYPT_MODE, deskey);
        return c1.doFinal(src);
    } catch (Exception e) {
        logger.error("ThreeDES Error");
    }
    return null;
}

// for test
public static void main(String[] args) {

    String szSrc = "12345678";

    String encoded = encryptMode(szSrc);
    System.out.println("加密后的字符串:" + encoded);
    //1xZ9Hssih5z0pegyf7aUcgQQ

}

}

The above is the java class I need to convert into PHP,

Attached is the following reference article
/q/10...

The following is the PHP code I wrote after reference.

<?php

$EasyCrypt3Des = new EasyCrypt3Des();
echo $EasyCrypt3Des->encrypt('12345678');
//java 结果 '1xZ9Hssih5z0pegyf7aUcgQQ';
exit;


class EasyCrypt3Des {
    private $_key = array("0x11", "0x28", "0x4F", "0x58", "0x88", "0x10", "0x40", "0x38", "0x28", "0x25", "0x79", "0x51","0xCB", "0xDD", "0x55", "0x66", "0x77", "0x29", "0x74", "0x98", "0x30", "0x40", "0x36", "0xE2");
    private $keyStr = "";
    public function __construct() {
        foreach($this->_key as $keyItem) {
            $this->keyStr .= $this->hexToStr($keyItem);
        }
    }

    public function encrypt($str) {
        $td = $this->gettd();
        $ret = mcrypt_generic($td,$str);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        $result =  base64_encode($ret);
        return str_replace('=','Q',$result);
    }



    private function getiv() {
        return pack('H16','0000000000000000');
    }

    private function gettd() {
        $iv = $this->getiv();
        $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
        mcrypt_generic_init($td, $this->keyStr,$iv);
        return $td;
    }

    private function hexToStr($hex){
        $string='';
        for ($i=0; $i < strlen($hex)-1; $i+=2){
            $string .= chr(hexdec($hex[$i].$hex[$i+1]));
        }
        return $string;
    }
}

Answer 1

The problem has been solved, please refer to the previous article:
1. The encrypted characters are not converted into characters, so they cannot be decrypted. One step is missing.
2. Refer to the article link I posted, the PHP class is completely universal. You can ignore the code I posted before, I will compile another correct one.

java

import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class ThreeDES {

private static final String Algorithm = "DESede"; //Define encryption algorithm, available DES, DESede, Blowfish

//keybyte为加密密钥，长度为24字节
//src为被加密的数据缓冲区（源）
public static byte[] encryptMode(byte[] keybyte, byte[] src) {
   try {
        //生成密钥
        SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

        //加密
        Cipher c1 = Cipher.getInstance(Algorithm);
        c1.init(Cipher.ENCRYPT_MODE, deskey);
        return c1.doFinal(src);
    } catch (java.security.NoSuchAlgorithmException e1) {
        e1.printStackTrace();
    } catch (javax.crypto.NoSuchPaddingException e2) {
        e2.printStackTrace();
    } catch (java.lang.Exception e3) {
        e3.printStackTrace();
    }
    return null;
}

//keybyte为加密密钥，长度为24字节
//src为加密后的缓冲区
public static byte[] decryptMode(byte[] keybyte, byte[] src) {      
try {
        //生成密钥
        SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

        //解密
        Cipher c1 = Cipher.getInstance(Algorithm);
        c1.init(Cipher.DECRYPT_MODE, deskey);
        return c1.doFinal(src);
    } catch (java.security.NoSuchAlgorithmException e1) {
        e1.printStackTrace();
    } catch (javax.crypto.NoSuchPaddingException e2) {
        e2.printStackTrace();
    } catch (java.lang.Exception e3) {
        e3.printStackTrace();
    }
    return null;
}

//转换成十六进制字符串
public static String byte2hex(byte[] b) {
    String hs="";
    String stmp="";

    for (int n=0;n<b.length;n++) {
        stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));
        if (stmp.length()==1) hs=hs+"0"+stmp;
        else hs=hs+stmp;
        if (n<b.length-1)  hs=hs+":";
    }
    return hs.toUpperCase();
}

public static void main(String[] args)
{
    //添加新安全算法,如果用JCE就要把它添加进去
    Security.addProvider(new com.sun.crypto.provider.SunJCE());

    final byte[] keyBytes = {0x11, 0x28, 0x4F, 0x58, (byte)0x88, 0x10, 0x40, 0x38
                           , 0x28, 0x25, 0x79, 0x51, (byte)0xCB, (byte)0xDD, 0x55, 0x66
                           , 0x77, 0x29, 0x74, (byte)0x98, 0x30, 0x40, 0x36, (byte)0xE2};    //24字节的密钥
    String szSrc = "12345678";
    
    System.out.println("加密前的字符串:" + szSrc);
    
    byte[] encoded = encryptMode(keyBytes, szSrc.getBytes());        
    System.out.println("加密后的字符串:" + new String(encoded));
    
    byte[] srcBytes = decryptMode(keyBytes, encoded);
    System.out.println("解密后的字符串:" + (new String(srcBytes)));
}

}

The above code is completely taken from /q/10...

The following is the PHP code.

<?php

class EasyCrypt3Des {

private $_key = "";

public function __construct() {
    $keyItem = array(
        '0x11','0x28','0x4F','0x58','0x88','0x10','0x40','0x38','0x28','0x25','0x79','0x51',
        '0xCB','0xDD','0x55','0x66','0x77','0x29','0x74','0x98','0x30','0x40','0x36','0xE2'
    );
    foreach($keyItem as $kitem) {
        //转换成字符
        $this->_key .= chr($kitem);
    }
}

public function encrypt($str) {
    $td = $this->gettd();
    $ret = mcrypt_generic($td, $this->pkcs5_pad($str, 8));
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);
    return $this->strToHex($ret);
}

public function decrypt($str) {
    $td = $this->gettd();
    $ret = $this->pkcs5_unpad(mdecrypt_generic($td, $this->hexToStr($str)));
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);
    return $ret;
}

private function pkcs5_pad($text, $blocksize) {
    $pad = $blocksize - (strlen($text) % $blocksize);
    return $text . str_repeat(chr($pad), $pad);
}

private function pkcs5_unpad($text) {
    $pad = ord($text{strlen($text) - 1});
    if ($pad > strlen($text)) {
        return false;
    }
    if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
        return false;
    }
    return substr($text, 0, -1 * $pad);
}

private function getiv() {
    return pack('H16', '0000000000000000');
}

private function gettd() {
    $iv = $this->getiv();
    $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
    mcrypt_generic_init($td, $this->_key, $iv);
    return $td;
}

private function strToHex($string){
    $hex = '';
    for ($i=0; $i<strlen($string); $i++){
        $ord = ord($string[$i]);
        $hexCode = dechex($ord);
        $hex .= substr('0'.$hexCode, -2);
    }
    return strToUpper($hex);
}

private function hexToStr($hex){
    $string='';
    for ($i=0; $i < strlen($hex)-1; $i+=2){
        $string .= chr(hexdec($hex[$i].$hex[$i+1]));
    }
    return $string;
}

}
$EasyCrypt3Des = new EasyCrypt3Des();
$code = $EasyCrypt3Des->encrypt('12345678');
echo $code .'<br/>';
echo $EasyCrypt3Des->decrypt( $code);
exit;

Mainly lies in character conversion.