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Rijndael: little code optimizing

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little code optimizing
This commit is contained in:
Hans-Jürgen Petrich 2013-01-21 15:46:44 +07:00
parent 45976002c7
commit d81563d6f3
1 changed files with 20 additions and 19 deletions
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39
phpseclib/Crypt/Rijndael.php
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@ -765,8 +765,13 @@ class Crypt_Rijndael {
case CRYPT_RIJNDAEL_MODE_CFB:
// cfb loosely routines inspired by openssl's:
// http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1
$iv = $this->encryptIV;
$pos = $this->continuousBuffer === true ? $buffer['pos'] : 0;
if ($this->continuousBuffer) {
$iv = &$this->encryptIV;
$pos = &$buffer['pos'];
} else {
$iv = $this->encryptIV;
$pos = 0;
}
$len = strlen($plaintext);
$i = 0;
if ($pos) {
@ -793,15 +798,10 @@ class Crypt_Rijndael {
}
if ($len) {
$iv = $this->_encryptBlock($iv);
//$block = substr($iv, $pos, $len) ^ substr($plaintext, $i, $len);
$block = substr($iv, $pos) ^ substr($plaintext, $i);
$block = $iv ^ substr($plaintext, $i);
$iv = substr_replace($iv, $block, 0, $len);
$ciphertext.= $block;
$pos+= $len;
}
if($this->continuousBuffer) {
$this->encryptIV = $iv;
$buffer['pos'] = $pos;
$pos = $len;
}
break;
case CRYPT_RIJNDAEL_MODE_OFB:
@ -896,8 +896,13 @@ class Crypt_Rijndael {
}
break;
case CRYPT_RIJNDAEL_MODE_CFB:
$iv = $this->decryptIV;
$pos = $this->continuousBuffer === true ? $buffer['pos'] : 0;
if ($this->continuousBuffer) {
$iv = &$this->decryptIV;
$pos = &$buffer['pos'];
} else {
$iv = $this->decryptIV;
$pos = 0;
}
$len = strlen($ciphertext);
$i = 0;
if ($pos) {
@ -926,13 +931,9 @@ class Crypt_Rijndael {
}
if ($len) {
$iv = $this->_encryptBlock($iv);
$plaintext.= substr($iv, $pos) ^ substr($ciphertext, $i);
$iv = substr_replace($iv, substr($ciphertext, $i, $len), 0, $len);
$pos+= $len;
}
if ($this->continuousBuffer) {
$this->decryptIV = $iv;
$buffer['pos'] = $pos;
$plaintext.= $iv ^ substr($ciphertext, $i);
$iv = substr_replace($iv, substr($ciphertext, $i), 0, $len);
$pos = $len;
}
break;
case CRYPT_RIJNDAEL_MODE_OFB:
@ -1499,4 +1500,4 @@ class Crypt_Rijndael {
}
// vim: ts=4:sw=4:et:
// vim6: fdl=1:
// vim6: fdl=1: