PHP 和 Java �g用 Des 加密(ECB mode) ��鬏��Y料，要�_保�蛇�用同�拥�key加解密的�Y果一�印�

PHP code：

/**

* DES 加解密(ECB mode)

*/

class DesCrypt {

private $key;

/**

* DES 加解密(ECB mode)

* @param string $key 加密的key

*/

public function __construct($key) {

$this->key = $key;

}

/**

* 加密(ECB mode)

* @param string $str 要加密的�Y料

* @return string

* @throws \Exception

*/

public function encrypt($str) {

//�@得加密算法的分�M大小

$size = mcrypt_get_block_size('des', 'ecb');

//填充不足字��担��魅����L度必�是 n * 分�M大小

$str = $this->pkcs5Pad($str, $size);

$key = $this->key;

//打�_算法和模�M���的模�K

$td = mcrypt_module_open('des', '', 'ecb', '');

$key_max_len = mcrypt_enc_get_key_size($td);

if (strlen($key) > $key_max_len) {

throw new \Exception("key超�^最大�L度：{$key_max_len}");

}

//建立初始向量

$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

//初始化加密所需的��n�^

//在 ECB 模式下，初始向量��被忽略， 在 CFB，CBC，STREAM，nOFB 和 OFB 模式下，必�提供初始向量

mcrypt_generic_init($td, $key, $iv);

//加密���

$data = mcrypt_generic($td, $str);

//清理指定加密模�M��n�^

mcrypt_generic_deinit($td);

//�P�]加密模�M

mcrypt_module_close($td);

//�⒓用芙Y果用base64��a

$data = base64_encode($data);

return $data;

}

/**

* 解密(ECB mode)

* @param string $str 要解密的密文

* @return string

* @throws \Exception

*/

public function decrypt($str) {

//��base64��a�Y果解�_

$str = base64_decode($str);

$key = $this->key;

//�@得加密算法的分�M大小

$td = mcrypt_module_open('des', '', 'ecb', '');

$key_max_len = mcrypt_enc_get_key_size($td);

if (strlen($key) > $key_max_len) {

throw new \Exception("key超�^最大�L度：{$key_max_len}");

}

//建立初始向量

$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

//$ks = mcrypt_enc_get_key_size($td);

//初始化加密所需的��n�^

mcrypt_generic_init($td, $key, $iv);

//解密���

$decrypted = mdecrypt_generic($td, $str);

//清理指定加密模�M��n�^

mcrypt_generic_deinit($td);

//�P�]加密模�M

mcrypt_module_close($td);

//去除 pkcs5Pad 的填充值

$result = $this->pkcs5Unpad($decrypted);

return $result;

}

/**

* 填充不足字���

* 1.�⑻畛淞咳�chr��填充值

* 2.��好�M也再填充一�M

* @param string $text

* @param int $blocksize

* @return string

*/

private function pkcs5Pad($text, $blocksize) {

$pad = $blocksize - (strlen($text) % $blocksize);

return $text . str_repeat(chr($pad), $pad);

}

/**

* 去除 pkcs5Pad 的填充值

* @param string $text

* @return boolean

* @return string

*/

private function pkcs5Unpad($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);

}

}

$Des = new DesCrypt("12345678");

$encrypt_res = $Des->encrypt("test data"); //l9TN9Ln/71IvFRjlhD8PaQ==

$Des->decrypt($encrypt_res); //test data

�]：PHP要�_定有�b php-mcrypt

$ yum install php-mcrypt

Java Code：

import javax.crypto.*;

import java.security.*;

import javax.crypto.spec.*;

/**

* DES算法

*

* @author user

*/

public class DES {

/**

* 加密函��

*

* @param data 加密���

* @param key 密�

* @return 返回加密後的���

*/

public static byte[] encrypt(byte[] data, byte[] key) {

try {

// DES算法要求有一��可信任的�S�C�翟�

SecureRandom sr = new SecureRandom();

// �脑�始密������建DESKeySpec�ο�

DESKeySpec dks = new DESKeySpec(key);

// ��建一��密匙工�S，然後用它把DESKeySpec�D�Q成

// 一��SecretKey�ο�

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(dks);

// using DES in ECB mode

Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

// 用密匙初始化Cipher�ο�

cipher.init(Cipher.ENCRYPT_MODE, secretKey, sr);

// �绦屑用懿僮�

byte encryptedData[] = cipher.doFinal(data);

return encryptedData;

} catch (Exception e) {

System.err.println("DES算法，加密���出�e!");

e.printStackTrace();

}

return null;

}

/**

* 解密函��

*

* @param data 解密���

* @param key 密�

* @return 返回解密後的���

*/

public static byte[] decrypt(byte[] data, byte[] key) {

try {

// DES算法要求有一��可信任的�S�C�翟�

SecureRandom sr = new SecureRandom();

// byte rawKeyData[] = /* 用某�N方法�@取原始密匙��� */;

// �脑�始密匙�����建一��DESKeySpec�ο�

DESKeySpec dks = new DESKeySpec(key);

// ��建一��密匙工�S，然後用它把DESKeySpec�ο筠D�Q成

// 一��SecretKey�ο�

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(dks);

// using DES in ECB mode

Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

// 用密匙初始化Cipher�ο�

cipher.init(Cipher.DECRYPT_MODE, secretKey, sr);

// 正式�绦薪饷懿僮�

byte decryptedData[] = cipher.doFinal(data);

return decryptedData;

} catch (Exception e) {

System.err.println("DES算法，解密出�e。");

e.printStackTrace();

}

return null;

}

}

import javax.xml.bind.*;

public class desTest {

public static void main(String[] args) {

String key = "12345678"; //�O定加密 key

String plain = "test data";//加密�热菝魑�

byte[] key_byte = key.getBytes();

byte[] plain_byte = plain.getBytes();

//ECB mode 加密

byte[] data_ecb = DES.encrypt(plain_byte, key_byte);

//加密�Y果�BASE64��a

String base64String = DatatypeConverter.printBase64Binary(data_ecb);

System.out.println("ECB密文��^BASE64��a:" + base64String);

try {

byte[] b = DatatypeConverter.parseBase64Binary(base64String);

System.out.println("ECB解密後明文:" + new String(DES.decrypt(b, key_byte)));

} catch (Exception ex) {

System.out.println(ex.getMessage());

System.out.println(ex.toString());

}

}

}

//�出

ECB密文��^BASE64��a:l9TN9Ln/71IvFRjlhD8PaQ==

ECB解密後明文:test data

�⒖肌⒐��：