Tutorial by Examples

This example illustrates the AES 256 symmetric cipher in CBC mode. An initialization vector is needed, so we generate one using an openssl function. The variable $strong is used to determine whether the IV generated was cryptographically strong. Encryption $method = "aes-256-cbc"; // cip...

PHP lacks a build-in function to encrypt and decrypt large files. openssl_encrypt can be used to encrypt strings, but loading a huge file into memory is a bad idea. So we have to write a userland function doing that. This example uses the symmetric AES-128-CBC algorithm to encrypt smaller chunks of...