11/11/2022 0 Comments Openssl tool decrypt key iv![]() ![]() ![]() ![]() It took me some time to work with the openssl documentation. If what you need is to simply get the job done - use a popular encryption library, don't write your own. If you want to learn about it, here's a fairly short, but still descriptive blog post that gives the right answers to key points that you should cover: You should also add authentication, proper padding, think carefully of how to manage & store your keys, etc. Please note that my answer is far from the whole story about doing encryption. Encrypting the file contents via PHP is enough, you don't need to deal with the command line. If you need to hex-encode the resulting $key, just pass it to bin2hex(), but the example that you gave is a bit broken. The key has to be randomly generated via openssl_random_pseudo_bytes() (or at least that's the most convenient way for your case): $key = openssl_random_pseudo_bytes(32) You've noticed that, but an encryption key is not something that you should just type in via your keyboard and md5()-ing anything is also never the answer for an encryption key. The documentation is also misleading in that it mentions a 'password' instead of 'key'. In PHP however, openssl_encrypt() and openssl_decrypt() expect a raw binary string. You'd have a hard time throwing binary data in a terminal, hence why the key there has to be hex-encoded. Your first link is about the command-line tools, not the PHP functions. CBC The le pic original.bmp contains a simple picture. $exec = "openssl enc -".$method." -d -in file.encrypted -nosalt -nopad -K ".strtohex($pass)." -iv ".$iv We include some common options for the openssl enc command in the following:-in input file-out output file-e encrypt-d decrypt-K/-iv key/iv in hex is the next argument-pP print the iv/key (then exit if -P) 3.2 Task 2: Encryption Mode ECB vs.We want to generate a 256-bit key and use Cipher Block Chaining (CBC). (Almost) straight from PHP comments ( ) function strtohex($x)įoreach (str_split($x) as $c) $s.=sprintf("%02X",ord($c)) Generate an AES key plus Initialization vector (iv) with openssl and how to encode/decode a file with the generated key/iv pair Note: AES is a symmetric-key algorithm which means it uses the same key during encryption/decryption.
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