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Bug #22316 Crypt_RC4 destroys its sbox.
Submitted: 2003-02-19 22:52 UTC Modified: 2003-07-27 05:46 UTC
From: mike at graftonhall dot co dot nz Assigned: zyprexia (profile)
Status: Closed Package: PEAR related
PHP Version: 4CVS-2003-02-19 (stable) OS: Windows 2000
Private report: No CVE-ID: None
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From: mike at graftonhall dot co dot nz
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 [2003-02-19 22:52 UTC] mike at graftonhall dot co dot nz
The Crypt_RC4::crypt() routine (and Crypt_RC4::decrypt()) destroys the sbox created in Crypt_RC4::key() causes the example code to no work.

So the code in the comment:
Usage:
$key = "pear";
$message = "PEAR rulez!";

$rc4 = new RC4;
$rc4->key($key);
echo "Original message: $message <br>\n";
$rc4->crypt($message);
echo "Encrypted message: $message <br>\n";
$rc4->decrypt($message);
echo "Decrypted message: $message <br>\n";

Does not work. For two reasons, first the class is nor Crypt_RC4 and second after crypt() has been called the sbox has been modified and so neither crypt nor decrypt will work correctly.

The example code should currently read:
Usage:
$key = "pear";
$message = "PEAR rulez!";

$rc4 = new Crypt_RC4;
$rc4->key($key);
echo "Original message: $message <br>\n";
$rc4->crypt($message);
echo "Encrypted message: $message <br>\n";
$rc4->key($key);
$rc4->decrypt($message);
echo "Decrypted message: $message <br>\n";

Note the extra key() call.

- Mike :-)

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 [2003-07-27 05:46 UTC] arnaud@php.net
This bug has been fixed in CVS.

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