Converting PHP openssl script to openssl command

Question

I'm using the following method to decrypt the data,

$clear = openssl_decrypt($data, 'aes-256-cbc', $pass, 0, $iv);

$iv is always null, but it works

But when I use openssl to decrypt the same file (the data is base64 encoded),

openssl aes-256-cbc -d -a -in encrypted

After inputing the password, it says error reading input file, totally weird error

Any ideas?

Answer 1

In PHP $pass is actually the full binary key. The openssl utility expects the actual password. You might want to use

openssl aes-256-cbc -d -a -in encrypted -K <hex-encoded key> -nosalt -iv 00000000000000000000000000000000