AES encryption and decryption using IV and CBC mode

[jitendra shelar]

Hi All,

I am newbie to playframework/scala. 

I am trying to implement AES algorithm encryption and decryption using IV and CBC mode.

    def decrypt(data:Array[Byte], iv:Array[Byte], key1:Array[Byte]): String={

    

     var cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")

     val key = new SecretKeySpec(key1, "AES")

     cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv))

     var encry= cipher.doFinal(data)   // getting error here

     val encodedBytes =  Base64.encodeBase64(encry)

     new String(encodedBytes)

  } 

I am getting following error at cipher.doFinal(data) line during decryption.

[BadPaddingException: Given final block not properly padded]

Can some body please help me on this.

If any other way implementing AES algorithm is present, please let me know.

Thanks & Regards,

Jitendra

[alex s]

воскресенье, 29 июня 2014 г., 17:46:35 UTC+4 пользователь jitendra shelar написал:

I am trying to implement AES algorithm encryption and decryption using IV and CBC mode.

 

Don't.
 

Can some body please help me on this.

No.

[Will Sargent]

From your code example, it looks like you're using the JCE implementation of AES. There's an example here that may help

https://www.owasp.org/index.php/Using_the_Java_Cryptographic_Extensions#AES_Encryption_and_Decryption

You may also want to check out this stack overflow answer:

http://stackoverflow.com/a/15554865/5266

Please don't say "implementing AES algorithm" -- you're using the algorithm to encrypt and decrypt, not implementing the algorithm itself.  The answer that Alex gave you is the correct response to that statement -- as an end user, you should never implement your own encryption algorithm, as it's almost certain to be incorrect.

Will Sargent

Consultant, Professional Services

Typesafe, the company behind Play Framework, Akka and Scala

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[jitendra shelar]

Thanks Will/Alex for correcting me. 

Thanks for your help.

Regards,

Jitendra

[Kevin Wright]

You might want to try stackoverflow

This is very much a question about Java's encryption APIs, not something specific to either Play or Scala.

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