How long is the encryption/decryption key for an assymetric algorithm, such as AES? If I use AES 128-bit, how many characters should I type in for my key? What about AES 256-bit?
Edit: Here is why I am asking: I am trying to use OpenSSL to encrypt some data using Node.js, PHP and command-line. I need to give in the key. When I tried 32 letter-key for AES128, it returned key length error. When I tried 32 for AES256 it returned general key error. I have no idea how I am supposed to enter the encryption key...