使用相同密钥的AES加密在Java和PHP中生成不同的值

Question

In PHP, I am unable to decrypt a string encrypted in java using AES CBC 128 bit. I have tried bott phpseclib and openssl on the PHP side. Though my preference is for phpseclib.

Java Side

1. I generated an AES 128 bit key using:

   keyGen = KeyGenerator.getInstance("AES");
   keyGen.init(128);
   secretKey = keyGen.generateKey();
   

2. Generated an initialization vector by getting bytes from a string:

   byte[] iv = "myuniqueivparam".getBytes("UTF-8");
   

3. Encrypted a string as follows:

   Cipher enCipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
   

   // the key and iv are passed on to php as strings

PHP side

1. Set the algorithm:

   $aes = new Crypt_AES(CRYPT_AES_MODE_CBC);
   

2. The key and iv I got from java are passed as strings:

   $aes->setKey($userKey); 
   $aes->setKeyLength(128);
   // when I echo this I get myuniqueivparam
   $ivdecode=base64_decode($iv); 
   $aes->setIV($ivdecode);
   

3. Set the same input and add padding

   $input="winning";
   $blocksize = 16;
   $pad1=$blocksize -(strlen($input) %$blocksize);
   $input1=$input . str_repeat(chr($pad1), $pad1);
   

4. Encrypted the string using phpseclib:

   $aes = new Crypt_AES(CRYPT_AES_MODE_CBC);
   $dummy = base64_encode($aes->encrypt($input1));
   echo $dummy;
   

5. $decryptedstring=$aes->decrypt($encryptedStringInJava);

Issues

1. When I print $dummy, in step 4, the encrypted string that I get does not match the encrypted string from java.

2. Decrypting $encryptedStringInJava is not working in PHP (step 5)

I have tried encryption/decryption in java using both phpseclib and openssl.