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AES: Fixed CFB decrypt() using MODE_MCRYPT and ContinuousBuffer

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AES: Fixed small bug from commit d94f1b252d (AES.php in line 425-426)
in CFB decrypt() using CRYPT_AES_MODE_MCRYPT and enableContinuousBuffer()
This commit is contained in:
Hans-Jürgen Petrich 2013-01-21 10:08:49 +07:00
parent 882e019062
commit 2deea8b491
1 changed files with 4 additions and 6 deletions
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8
phpseclib/Crypt/AES.php
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@ -337,12 +337,11 @@ class Crypt_AES extends Crypt_Rijndael {
} }
$ciphertext.= mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % 16)); $ciphertext.= mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % 16));
$iv = substr($ciphertext, -16); $iv = substr($ciphertext, -16);
$i = strlen($ciphertext);
$len%= 16; $len%= 16;
} }
if ($len) { if ($len) {
$iv = mcrypt_generic($this->ecb, $iv); $iv = mcrypt_generic($this->ecb, $iv);
$block = substr($iv, $pos) ^ substr($plaintext, $i); $block = $iv ^ substr($plaintext, -$len);
$iv = substr_replace($iv, $block, 0, $len); $iv = substr_replace($iv, $block, 0, $len);
$ciphertext.= $block; $ciphertext.= $block;
$pos = $len; $pos = $len;
@ -412,7 +411,6 @@ class Crypt_AES extends Crypt_Rijndael {
// ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
$plaintext = substr($iv, $orig_pos) ^ $ciphertext; $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i); $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
$this->debuffer['demcrypt_init'] = true;
} }
if ($len >= 16) { if ($len >= 16) {
$cb = substr($ciphertext, $i, $len - $len % 16); $cb = substr($ciphertext, $i, $len - $len % 16);
@ -422,8 +420,8 @@ class Crypt_AES extends Crypt_Rijndael {
} }
if ($len) { if ($len) {
$iv = mcrypt_generic($this->ecb, $iv); $iv = mcrypt_generic($this->ecb, $iv);
$plaintext.= substr($iv, $pos) ^ substr($ciphertext, $i); $plaintext.= $iv ^ substr($ciphertext, -$len);
$iv = substr_replace($iv, substr($ciphertext, $i, $len), 0, $len); $iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len);
$pos = $len; $pos = $len;
} }