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Merge pull request #377 from terrafrost/rc4-changes

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RC4: speedups

* terrafrost/rc4-changes:
  RC4: speedups
This commit is contained in:
Andreas Fischer 2014-06-16 16:28:29 +02:00
commit 5cc024a3b5
1 changed files with 2 additions and 5 deletions
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7
phpseclib/Crypt/RC4.php
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@ -267,10 +267,7 @@ class Crypt_RC4 extends Crypt_Base
{ {
$key = $this->key; $key = $this->key;
$keyLength = strlen($key); $keyLength = strlen($key);
$keyStream = array(); $keyStream = range(0, 255);
for ($i = 0; $i < 256; $i++) {
$keyStream[$i] = $i;
}
$j = 0; $j = 0;
for ($i = 0; $i < 256; $i++) { for ($i = 0; $i < 256; $i++) {
$j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255; $j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255;
@ -324,7 +321,7 @@ class Crypt_RC4 extends Crypt_Base
$keyStream[$i] = $ksj; $keyStream[$i] = $ksj;
$keyStream[$j] = $ksi; $keyStream[$j] = $ksi;
$text[$k] = chr(ord($text[$k]) ^ $keyStream[($ksj + $ksi) & 255]); $text[$k] = $text[$k] ^ chr($keyStream[($ksj + $ksi) & 255]);
} }
return $text; return $text;