mcrypt_create_iv returns undefined variable

My encryption/iv code doesn't work. Whenever I test the login I get this error

Warning: openssl_encrypt(): Using an empty Initialization Vector (iv) is potentially insecure and not recommended in /Users/luke/Sites/user.php on line 174

I have tracked it down to this line

$size = mcrypt_get_iv_size(MCRYPT_CAST_256, MCRYPT_MODE_CFB); $iv = mcrypt_create_iv($size, MCRYPT_DEV_URANDOM); $method = "aes-128-cbc"; $passWord = mcrypt_create_iv($size, MCRYPT_DEV_URANDOM); $verificationNumber = openssl_encrypt($passWord, $method, $iv); 

Mcrypt is installed fine as shown by this. mcrypt_create_iv returns undefined variable
Can you help or do i possibly need to provide more code?

Replay

You are getting the iv size for "CAST": MCRYPT_CAST_256 but you are encryption with "aes-128-cbc". That is an algorithm mis-match.

The CAST block size is 64-bits, the AES block size if 128-bits. Instead use MCRYPT_RIJNDAEL_128, AES is a subset of Rijndael with a block of 128-bits.

Category: php Time: 2016-01-26 Views: 4

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