Encryption Decryption using Rijndael encryption in Java. Hi I want a source code in Java for Encryption/Decryption using Rijndael Algorithm Thanks and Regards.

Don omar meet the orphans download. 'I see it is 32 bytes in length. Is there a way so that it can accept a 32 byte IV?' The underlying problem is that 'Rijndael_256' in mcrypt is a Rijndael variant that uses 256 bit blocksize instead of 128 bit blocksize that is used in all AES versions. You will have difficulties to find any implementation of 'Rijndeal_256' other than the mcrypt library.

(See ) Edit: Bouncy Castle actually supports Rijndeal_256 via RijndaelEngine: 'Some suggested not using mcrypt in php while others said to use a 128 algorithm variant.' Both suggestions are correct. Mcrypt is a horrible library, but if you have to you can get something running with 'Rijndael_128', which is identical to AES128. Some remarks on your code: You hash the verbatim data md5($data) but encrypt a trimmed plaintext trim($data). You use the default zero padding of mcrypt but specify PKCS5Padding in Java, this wont't work. As you use CBC but no authentication after encryption and before decryption you are likely prone to padding oracle attacks.

'Yeah well im new in using cryptography.' - Alternatives: Given your current level of cryptography expertise you should avoid implementing any cryptography at all. Instead use high level libraries and protocols. Which one to use greatly depends on your use case. For example if the PHP code runs on a trusted server and the Java code on the client side you can connect to the server via SSL/TLS (most likely using https). The TLS connection will authenticate the server to the client and you can use to authenticate the client to the server.