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Merge pull request #62 from petrich/patch-4
DES: Fixed CFB decrypt() using MODE_MCRYPT and ContinuousBuffer
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commit
e11998787c
@ -536,7 +536,6 @@ class Crypt_DES {
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}
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$ciphertext.= mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % 8));
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$iv = substr($ciphertext, -8);
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$i = strlen($ciphertext);
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$len%= 8;
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} else {
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while ($len >= 8) {
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@ -549,7 +548,7 @@ class Crypt_DES {
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}
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if ($len) {
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$iv = mcrypt_generic($this->ecb, $iv);
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$block = $iv ^ substr($plaintext, $i);
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$block = $iv ^ substr($plaintext, -$len);
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$iv = substr_replace($iv, $block, 0, $len);
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$ciphertext.= $block;
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$pos = $len;
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@ -726,7 +725,6 @@ class Crypt_DES {
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}
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$plaintext = substr($iv, $orig_pos) ^ $ciphertext;
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$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
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$this->debuffer['demcrypt_init'] = true;
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}
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if ($len >= 8) {
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$cb = substr($ciphertext, $i, $len - $len % 8);
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@ -736,8 +734,8 @@ class Crypt_DES {
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}
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if ($len) {
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$iv = mcrypt_generic($this->ecb, $iv);
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$plaintext.= $iv ^ substr($ciphertext, $i);
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$iv = substr_replace($iv, substr($ciphertext, $i, $len), 0, $len);
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$plaintext.= $iv ^ substr($ciphertext, -$len);
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$iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len);
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$pos = $len;
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}
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return $plaintext;
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@ -833,7 +831,7 @@ class Crypt_DES {
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if ($len) {
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$iv = $this->_processBlock($iv, CRYPT_DES_ENCRYPT);
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$plaintext.= $iv ^ substr($ciphertext, $i);
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$iv = substr_replace($iv, substr($ciphertext, $i, $len), 0, $len);
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$iv = substr_replace($iv, substr($ciphertext, $i), 0, $len);
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$pos = $len;
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}
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return $plaintext;
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