Encrypt / Decrypt Between Android and PHP

12 votes · 61 comments

This is the code in Android (Java) and PHP to encrypt and decrypt Strings

HOW TO USE IT (JAVA)

mcrypt = new MCrypt();
/* Encrypt */
String encrypted = MCrypt.bytesToHex( mcrypt.encrypt("Text to Encrypt") );
/* Decrypt */
String decrypted = new String( mcrypt.decrypt( encrypted ) );

HOW TO USE IT (PHP)

$mcrypt = new MCrypt();
#Encrypt
$encrypted = $mcrypt->encrypt("Text to encrypt");
#Decrypt
$decrypted = $mcrypt->decrypt($encrypted);

raw · 
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 · download/***********/
/**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";//Dummy iv (CHANGE IT!)
		private IvParameterSpec ivspec;
		private SecretKeySpec keyspec;
		private Cipher cipher;
		
		private String SecretKey = "0123456789abcdef";//Dummy secretKey (CHANGE IT!)
		
		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'; #Same as in JAVA
		private $key = '0123456789abcdef'; #Same as in JAVA


		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;
		}

	}

/***********/
/**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";//Dummy iv (CHANGE IT!)
		private IvParameterSpec ivspec;
		private SecretKeySpec keyspec;
		private Cipher cipher;
		
		private String SecretKey = "0123456789abcdef";//Dummy secretKey (CHANGE IT!)
		
		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'; #Same as in JAVA
		private $key = '0123456789abcdef'; #Same as in JAVA

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;
		}

}

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61 Comments

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Reply · Aug. 7, 2011, 2:39 p.m.

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On the java side of this I am not able to declare the instance of the class as mcrypt = new MCrypt, i must instead declare it as MCrypt mcrypt = new MCrypt;

Additionally MCrypt mcrypt = new MCrypt; String encrypted = MCrypt.bytesToHex( mcrypt.encrypt("Text to Encrypt") ); I get type errors when using the class as you suggest. Can you please tell me what I am doing wrong? Thank you for the neat piece of code you have submitted.

Reply · Nov. 28, 2011, 3:19 a.m.