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SymmetricKey: add Eval engine implementation for 'cfb8' cipher mode of operation

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This commit is contained in:
Takuya Sawada 2017-10-04 19:33:34 +09:00
parent 8604e327a3
commit 7aa400745c
1 changed files with 46 additions and 0 deletions
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46
phpseclib/Crypt/Common/SymmetricKey.php
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@ -2558,6 +2558,52 @@ abstract class SymmetricKey
$_pos = $_len;
}
return $_plaintext;
';
break;
case self::MODE_CFB8:
$encrypt = $init_encrypt . '
$_ciphertext = "";
$_len = strlen($_text);
$_iv = $this->encryptIV;
for ($_i = 0; $_i < $_len; ++$_i) {
$in = $_iv;
'.$encrypt_block.'
$_ciphertext .= ($_c = $_text[$_i] ^ $in);
$_iv = substr($_iv, 1, '.$block_size.' - 1) . $_c;
}
if ($this->continuousBuffer) {
if ($_len >= '.$block_size.') {
$this->encryptIV = substr($_ciphertext, -'.$block_size.');
} else {
$this->encryptIV = substr($this->encryptIV, $_len - '.$block_size.') . substr($_ciphertext, -$_len);
}
}
return $_ciphertext;
';
$decrypt = $init_encrypt . '
$_plaintext = "";
$_len = strlen($_text);
$_iv = $this->decryptIV;
for ($_i = 0; $_i < $_len; ++$_i) {
$in = $_iv;
'.$encrypt_block.'
$_plaintext .= $_text[$_i] ^ $in;
$_iv = substr($_iv, 1, '.$block_size.' - 1) . $_text[$_i];
}
if ($this->continuousBuffer) {
if ($_len >= '.$block_size.') {
$this->decryptIV = substr($_text, -'.$block_size.');
} else {
$this->decryptIV = substr($this->decryptIV, $_len - '.$block_size.') . substr($_text, -$_len);
}
}
return $_plaintext;
';
break;