[openssl-users] Using random bytes only in openssl_encrypt versus real private key

[Salz, Rich]

>    This begs the question: what does openssl_encrypt actually do with just a string
    of random bytes passed as the "key". I can't find anything in the OpenSSL or
    PHP/openssl source code that clearly identifies any particular action
  
There is no such name (git grep -I openssl_encrypt) in the OpenSSL source.  This is some PHP function that is calling underlying OpenSSL.  I would ask on the PHP forum(s) what it's doing.