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added test for entropy of cypher text

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This commit is contained in:
Simon Rupf 2012-09-08 19:52:44 +02:00
parent 2b69a862ec
commit 0079c73a84
1 changed files with 11 additions and 10 deletions
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21
lib/sjcl.php
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@ -36,26 +36,27 @@ class sjcl
if (is_null($decoded)) return false; if (is_null($decoded)) return false;
$decoded = (array) $decoded; $decoded = (array) $decoded;
// Make sure required fields are present and contain base64 data.
foreach($accepted_keys as $k)
{
if (!(
array_key_exists($k, $decoded) &&
base64_decode($decoded[$k], $strict=true)
)) return false;
}
// Make sure no additionnal keys were added. // Make sure no additionnal keys were added.
if ( if (
count(array_keys($decoded)) != count($accepted_keys) count(array_keys($decoded)) != count($accepted_keys)
) return false; ) return false;
// FIXME: Reject data if entropy is too low? // Make sure required fields are present and contain base64 data.
foreach($accepted_keys as $k)
{
if (!(
array_key_exists($k, $decoded) &&
$ct = base64_decode($decoded[$k], $strict=true)
)) return false;
}
// Make sure some fields have a reasonable size. // Make sure some fields have a reasonable size.
if (strlen($decoded['iv']) > 24) return false; if (strlen($decoded['iv']) > 24) return false;
if (strlen($decoded['salt']) > 14) return false; if (strlen($decoded['salt']) > 14) return false;
// Reject data if entropy is too low
if (strlen($ct) > strlen(gzdeflate($ct))) return false;
return true; return true;
} }
} }