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Bug #78628 AES-256-XTS cipher method does not work
Submitted: 2019-10-03 11:10 UTC Modified: -
From: Assigned:
Status: Open Package: OpenSSL related
PHP Version: 7.3.10 OS: Linux
Private report: No CVE-ID: None
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 [2019-10-03 11:10 UTC]
Tested with various PHP versions (7.3.9 and 7.4.0beta4 and some older 7.x) on Ubuntu 18.04. This originates from on of our users using PHP 7.3 on Debian Stable.

$php -r "print_r(openssl_get_cipher_methods());" | grep -i xts
    [12] => aes-128-xts
    [35] => aes-256-xts

However, if you see the test script openssl_enrypt() does not work, returns false. No error/warning. The same for AES-128-XTS.

I'm not sure what is expected from OpenSSL in the system, but `openssl ciphers -v | grep XTS` returns nothing.

Maybe that's not a bug, but I'd like to hear some explanation for this behavior.

Test script:
$iv = random_bytes(openssl_cipher_iv_length("aes-256-XTS"));
echo openssl_encrypt("test", "aes-256-XTS", "key", OPENSSL_RAW_DATA, $iv) === false;

Expected result:

Actual result:


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 [2019-10-04 11:06 UTC]
Additional info:
$ openssl list -cipher-algorithms | grep XTS
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Last updated: Wed Nov 13 01:01:33 2019 UTC