PHP AES Encryption JAVA to PHP - openssl_encrypt - php

Question

I am using openssl_encrypt function available in PHP to get the similar result as the below java code is producing.
But it is all different. Kindly help me.
JAVA CODE
package com.atom.echallan.security.util;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import com.atom.echallan.util.EChallanUtil;
public class AtomAES {
private String password = "8E41C78439831010F81F61C344B7BFC7";
private String salt = "200000054575202";
private static int pswdIterations = 65536 ;
private static int keySize = 256;
private final byte[] ivBytes = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
public AtomAES(){
super();
}
public String encrypt(String plainText, String key, String merchantTxnId) throws Exception
{
this.password = key;
// salt->200000054575202
this.salt = merchantTxnId;
return encrypt(plainText);
}
private String encrypt(String plainText) throws Exception {
byte[] saltBytes = salt.getBytes("UTF-8");
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
PBEKeySpec spec = new PBEKeySpec(
password.toCharArray(),
saltBytes,
pswdIterations,
keySize
);
SecretKey secretKey = factory.generateSecret(spec);
SecretKeySpec secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
//encrypt the message
IvParameterSpec localIvParameterSpec = new IvParameterSpec(ivBytes);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); //CBC
cipher.init(Cipher.ENCRYPT_MODE, secret,localIvParameterSpec);
byte[] encryptedTextBytes = cipher.doFinal(plainText.getBytes("UTF-8"));
return byteToHex(encryptedTextBytes);
}
public String decrypt(String encryptedText, String key, String merchantTxnId) throws Exception {
this.password = key;
this.salt = merchantTxnId;
return decrypt(encryptedText);
}
private String decrypt(String encryptedText) throws Exception {
byte[] saltBytes = salt.getBytes("UTF-8");
byte[] encryptedTextBytes = hex2ByteArray(encryptedText);
// Derive the key
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
PBEKeySpec spec = new PBEKeySpec(
password.toCharArray(),
saltBytes,
pswdIterations,
keySize
);
SecretKey secretKey = factory.generateSecret(spec);
SecretKeySpec secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
// Decrypt the message
IvParameterSpec localIvParameterSpec = new IvParameterSpec(ivBytes);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");//CBC
cipher.init(Cipher.DECRYPT_MODE, secret,localIvParameterSpec);
byte[] decryptedTextBytes = null;
decryptedTextBytes = cipher.doFinal(encryptedTextBytes);
return new String(decryptedTextBytes);
}
//Converts byte array to hexadecimal String
private String byteToHex(byte byData[])
{
StringBuffer sb = new StringBuffer(byData.length * 2);
for(int i = 0; i < byData.length; i++)
{
int v = byData[i] & 0xff;
if(v < 16)
sb.append('0');
sb.append(Integer.toHexString(v));
}
return sb.toString().toUpperCase();
}
//Converts hexadecimal String to array of byte
private byte[] hex2ByteArray(String sHexData)
{
byte rawData[] = new byte[sHexData.length() / 2];
for(int i = 0; i < rawData.length; i++)
{
int index = i * 2;
int v = Integer.parseInt(sHexData.substring(index, index + 2), 16);
rawData[i] = (byte)v;
}
return rawData;
}
public static void main(String[] args)throws Exception{
AtomAES aes = new AtomAES();
String data = "mmp_txn=355106|mer_txn=M123|amt=100.0000|";
String encData = aes.encrypt(data, EChallanUtil.ATOM_ENCRYPTION_KEY, "178");
System.out.println("ENC DATA : " + encData);
System.out.println("DEC DATA : " + aes.decrypt(encData, EChallanUtil.ATOM_ENCRYPTION_KEY, "178"));
}
}
PHP CODE
class Encryption {
public function encrypt($data, $key = "4A8A53E16C9C34EA5E77EF9FF7B2FD04", $method = "AES-256-CBC") {
$size = openssl_cipher_iv_length($method);
$iv = substr($key, 0, 16);
// string openssl_pbkdf2 ( string $password , string $salt , int $key_length , int $iterations [, string $digest_algorithm ] )
$hash = openssl_pbkdf2($key,'178','256','65536', 'sha1');
$encrypted = openssl_encrypt($data, $method, $hash, OPENSSL_RAW_DATA, $iv);
return bin2hex($encrypted);
}
public function decrypt($data, $key, $method) {
$size = openssl_cipher_iv_length($method);
$iv = substr($key, 0, $size);
$decrypted = openssl_decrypt($data, $method, $key, false, $iv);
return $decrypted;
}
function pkcs5_pad ($text, $blocksize)
{
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}
}
$text = 'mmp_txn=355106|mer_txn=M123|amt=100.0000|';
//
//$enc = new AESEncryption;
//$enc1 = new CbcCrypt;
$enc2 = new Encryption;
echo $enc2->encrypt($text);
JAVA Result :
ENC DATA : 4BBB37555EFFEF677CEF1B5D55843E50255F65540DF16AFB3F2A0B7B91341E54FB0432EEE2154A947DAD013E8C99822D
PHP Result : c43ba05ae04f68ae18313bc2042595fc70981e0d9421af9d232a3d17a01b5dd8dd8ce702230f6e49d918c9578f9c6944
I dont know why it is happening.
Length of the string is same but result are different.
How to get the similar result as in java?

Answer 1

I have solved your code by using below code Hope this may help you
public function encrypt($data, $key = "4A8A53E16C9C34EA5E77EF9FF7B2FD04", $method = "AES-256-CBC") {
$salt="178";
//Converting Array to bytes
$iv = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
$chars = array_map("chr", $iv);
$IVbytes = join($chars);
$salt1 = mb_convert_encoding($salt, "UTF-8"); //Encoding to UTF-8
$key1 = mb_convert_encoding($key, "UTF-8"); //Encoding to UTF-8
//SecretKeyFactory Instance of PBKDF2WithHmacSHA1 Java Equivalent
$hash = openssl_pbkdf2($key1,$salt1,'256','65536', 'sha1');
$encrypted = openssl_encrypt($data, $method, $hash, OPENSSL_RAW_DATA, $IVbytes);
return bin2hex($encrypted);
}