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Invoke OpenSSL command via shell_exec() in PHP [duplicate]

When I execute:

openssl_decrypt(
 base64_decode(file_get_contents('/path/to/file')),
 'aes-256-cbc',
 $key,
 OPENSSL_RAW_DATA,
 $iv
);

OpenSSL decrypts my file perfectly. However, when I execute:

shell_exec('openssl enc -aes-256-cbc -base64 -d -A -p -K ' . $key . ' -iv ' . $iv . ' -in /path/to/file -out /path/to/dest');

The destination file is not created.

Does anyone know what could be wrong? My client wants to be able to upload large files up to 2GB, and loading that much data into a PHP variable seems like an exceedingly bad idea.

Edit:

With bin2hex i get a seemingly sane command of:

openssl enc -aes-256-cbc -base64 -d -A -p -K 64343438343165333635663434663262633036636235656462383238356239303763373365353633 -iv abdd099c7bac8b514089d8c901c8395c -in /usr/www/vault/new/d71fd708181573c5f92c8f500ddcb399/787 -out /tmp/decrypted/57574484b684c

But with pack I get:

openssl enc -aes-256-cbc -base64 -d -A -p -K M�>VO���[ދ�� �7^6 -iv ⬧⬧⬧⬧⬧⬧⬧ -in /usr/www/vault/new/d71fd708181573c5f92c8f500ddcb399/787 -out /tmp/decrypted57574484b684c

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Yeah, I've tried hex encoding my key and iv to hex and it still doesn't output anything. I'm going to keep looking at it.

user1119648
– user1119648

2016年06月07日 21:37:49 +00:00
Commented Jun 7, 2016 at 21:37
bin2hex encodes with "highest nibble first" which is network byte order. You can try to encode it with "lowest nibble first"/little endian, which is the byte order of a normal intel based PC, using pack: pack("h*", $key)

Dennis B.
– Dennis B.

2016年06月07日 21:42:54 +00:00
Commented Jun 7, 2016 at 21:42

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Invoke OpenSSL command via shell_exec() in PHP [duplicate]

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