Android和PHP上的加、解密字串。

android上使用：

mcrypt = new MCrypt();
/* 加密*/
String encrypted = MCrypt.bytesToHex( mcrypt.encrypt("需加密的字元") );
/* 解密*/
String decrypted = new String( mcrypt.decrypt( encrypted ) );

$mcrypt = new MCrypt();
#Encrypt
$encrypted = $mcrypt->encrypt("需加密的字元");
#Decrypt
$decrypted = $mcrypt->decrypt($encrypted);
 

/***********/
/**JAVA**/

        import java.security.NoSuchAlgorithmException;

        import javax.crypto.Cipher;
        import javax.crypto.NoSuchPaddingException;
        import javax.crypto.spec.IvParameterSpec;
        import javax.crypto.spec.SecretKeySpec;

        public class MCrypt {

                private String iv = "fedcba9876543210";//虛擬的 iv (需更改)
                private IvParameterSpec ivspec;
                private SecretKeySpec keyspec;
                private Cipher cipher;
                
                private String SecretKey = "0123456789abcdef";//虛擬的 金鑰 (需更改）    
            
                public MCrypt()
                {
                        ivspec = new IvParameterSpec(iv.getBytes());

                        keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");
                        
                        try {
                                cipher = Cipher.getInstance("AES/CBC/NoPadding");
                        } catch (NoSuchAlgorithmException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        } catch (NoSuchPaddingException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        }
                }
                
                public byte[] encrypt(String text) throws Exception
                {
                        if(text == null || text.length() == 0)
                                throw new Exception("Empty string");
                        
                        byte[] encrypted = null;

                        try {
                                cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);

                                encrypted = cipher.doFinal(padString(text).getBytes());
                        } catch (Exception e)
                        {                       
                                throw new Exception("[encrypt] " + e.getMessage());
                        }
                        
                        return encrypted;
                }
                
                public byte[] decrypt(String code) throws Exception
                {
                        if(code == null || code.length() == 0)
                                throw new Exception("Empty string");
                        
                        byte[] decrypted = null;

                        try {
                                cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
                                
                                decrypted = cipher.doFinal(hexToBytes(code));
                        } catch (Exception e)
                        {
                                throw new Exception("[decrypt] " + e.getMessage());
                        }
                        return decrypted;
                }
                

                
                public static String bytesToHex(byte[] data)
                {
                        if (data==null)
                        {
                                return null;
                        }
                        
                        int len = data.length;
                        String str = "";
                        for (int i=0; i<len; i++) {
                                if ((data[i]&0xFF)<16)
                                        str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);
                                else
                                        str = str + java.lang.Integer.toHexString(data[i]&0xFF);
                        }
                        return str;
                }
                
                        
                public static byte[] hexToBytes(String str) {
                        if (str==null) {
                                return null;
                        } else if (str.length() < 2) {
                                return null;
                        } else {
                                int len = str.length() / 2;
                                byte[] buffer = new byte[len];
                                for (int i=0; i<len; i++) {
                                        buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
                                }
                                return buffer;
                        }
                }
                
                

                private static String padString(String source)
                {
                  char paddingChar = ' ';
                  int size = 16;
                  int x = source.length() % size;
                  int padLength = size - x;

                  for (int i = 0; i < padLength; i++)
                  {
                          source += paddingChar;
                  }

                  return source;
                }
        }
 

/**********/
/**PHP**/

        <?php 

        class MCrypt
        {
                private $iv = 'fedcba9876543210'; #和上面JAVA中的一樣
                private $key = '0123456789abcdef'; #和上面JAVA中的一樣


                function __construct()
                {
                }

                function encrypt($str) {

                  //$key = $this->hex2bin($key);    
                  $iv = $this->iv;

                  $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);

                  mcrypt_generic_init($td, $this->key, $iv);
                  $encrypted = mcrypt_generic($td, $str);

                  mcrypt_generic_deinit($td);
                  mcrypt_module_close($td);

                  return bin2hex($encrypted);
                }

                function decrypt($code) {
                  //$key = $this->hex2bin($key);
                  $code = $this->hex2bin($code);
                  $iv = $this->iv;

                  $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);

                  mcrypt_generic_init($td, $this->key, $iv);
                  $decrypted = mdecrypt_generic($td, $code);

                  mcrypt_generic_deinit($td);
                  mcrypt_module_close($td);

                  return utf8_encode(trim($decrypted));
                }

                protected function hex2bin($hexdata) {
                  $bindata = '';

                  for ($i = 0; $i < strlen($hexdata); $i += 2) {
                        $bindata .= chr(hexdec(substr($hexdata, $i, 2)));
                  }

                  return $bindata;
                }

        }