$allowedCiphers public property
Look-up table of block sizes and key sizes for each supported OpenSSL cipher. In each element, the key is one of the ciphers supported by OpenSSL (@see openssl_get_cipher_methods()). The value is an array of two integers, the first is the cipher's block size in bytes and the second is the key size in bytes.
Warning: All OpenSSL ciphers that we recommend are in the default value, i.e. AES in CBC mode.
Note: Yii's encryption protocol uses the same size for c