How php 3DES encryption is compatible with Java-PHP Tutorial-php.cn

How php 3DES encryption is compatible with Java

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Release： 2016-10-19 10:40:55

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Java source code:

<code>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"; //定义 加密算法,可用 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, 0x22, 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 = "This is a 3DES test. 测试";
        
        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)));
    }

}
</code>

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Java source code:

<code>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"; //定义 加密算法,可用 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, 0x22, 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 = "This is a 3DES test. 测试";
        
        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)));
    }

}
</code>

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Solved Question and Answer

<code>class EasyCrypt3Des {
    private $_key = "helloworld";
 
    public function __construct($key=null) {
        if($key !== null)
            $this->_key = $key;
    }

    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;
    }
}</code>

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