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Bug #73808 iv length warning too restrictive for aes-128-ccm
Submitted: 2016-12-23 19:23 UTC Modified: 2017-04-30 18:37 UTC
From: anthon dot pang at gmail dot com Assigned: bukka (profile)
Status: Closed Package: OpenSSL related
PHP Version: 7.1.0 OS:
Private report: No CVE-ID: None
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 [2016-12-23 19:23 UTC] anthon dot pang at gmail dot com 
Description:
------------
openssl_decrypt with a cipher of 'aes-128-ccm' currently enforces an iv length of 12 octets or 96 bits. According to various RFCs, the iv length has an allowable range of 7 to 13 octets.

https://tools.ietf.org/html/rfc3610
https://tools.ietf.org/html/rfc5084

"aes-nonce         OCTET STRING (SIZE(7..13)),"



Expected result:
----------------
In php_openssl_validate_iv(), when mode->is_aead, treat iv_required_len as a recommendation; do a range check instead.

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 [2016-12-28 12:00 UTC] anthon dot pang at gmail dot com 
Just for comparison, sjcl appears to silently truncate iv when length > 13.
 [2017-04-30 18:37 UTC] bukka@php.net
-Summary: iv length check too restrictive for aes-128-ccm +Summary: iv length warning too restrictive for aes-128-ccm -Status: Open +Status: Assigned -Assigned To: +Assigned To: bukka
 [2017-04-30 18:37 UTC] bukka@php.net 
IV length can be set. You can try

var_dump(openssl_encrypt('data', 'aes-256-ccm', 'password', 0, '1234567', $tag));

or just see https://3v4l.org/5Vdo3

The only thing that is wrong is a warning that specifies default length which doesn't make much sense because it can be a range so the message should be definitely stripped. I'll fix it as part of this bug (that's why I renamed it...)
 [2017-04-30 18:46 UTC] bukka@php.net 
Automatic comment on behalf of bukka
Revision: http://git.php.net/?p=php-src.git;a=commit;h=6028fe511efd7e7f8444af9e53c4bbd7368233b1
Log: Fix bug #73808 (iv length warning too restrictive for aes-128-ccm)
 [2017-04-30 18:46 UTC] bukka@php.net
-Status: Assigned +Status: Closed
 [2017-04-30 18:47 UTC] bukka@php.net 
Automatic comment on behalf of bukka
Revision: http://git.php.net/?p=php-src.git;a=commit;h=6028fe511efd7e7f8444af9e53c4bbd7368233b1
Log: Fix bug #73808 (iv length warning too restrictive for aes-128-ccm)
 
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