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Backport CFB8 support from master

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This commit is contained in:
Jakob Gahde 2018-03-27 04:32:16 +02:00
parent fc90c58f7f
commit 8e6948fdd2
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GPG Key ID: 7FBBA482BA1BC85D
2 changed files with 112 additions and 0 deletions
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110
phpseclib/Crypt/Base.php
View File

@ -76,6 +76,10 @@ abstract class Base
* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
*/
const MODE_CFB = 3;
/**
* Encrypt / decrypt using the Cipher Feedback mode (8bit)
*/
const MODE_CFB8 = 38;
/**
* Encrypt / decrypt using the Output Feedback mode.
*
@ -479,6 +483,7 @@ abstract class Base
break;
case self::MODE_CTR:
case self::MODE_CFB:
case self::MODE_CFB8:
case self::MODE_OFB:
case self::MODE_STREAM:
$this->mode = $mode;
@ -762,6 +767,16 @@ abstract class Base
$iv = substr($ciphertext, -$this->block_size);
}
return $ciphertext;
case self::MODE_CFB8:
$ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->encryptIV);
if ($this->continuousBuffer) {
if (($len = strlen($ciphertext)) >= $this->block_size) {
$this->encryptIV = substr($ciphertext, -$this->block_size);
} else {
$this->encryptIV = substr($this->encryptIV, $len - $this->block_size) . substr($ciphertext, -$len);
}
}
return $ciphertext;
case self::MODE_OFB:
return $this->_openssl_ofb_process($plaintext, $this->encryptIV, $this->enbuffer);
@ -942,6 +957,24 @@ abstract class Base
$pos = $len;
}
break;
case self::MODE_CFB8:
$ciphertext = '';
$len = strlen($plaintext);
$iv = $this->encryptIV;
for ($i = 0; $i < $len; ++$i) {
$ciphertext .= ($c = $plaintext[$i] ^ $this->_encryptBlock($iv));
$iv = substr($iv, 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);
}
}
break;
case self::MODE_OFB:
$xor = $this->encryptIV;
if (strlen($buffer['xor'])) {
@ -1072,6 +1105,16 @@ abstract class Base
$iv = substr($ciphertext, -$this->block_size);
}
break;
case self::MODE_CFB8:
$plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV);
if ($this->continuousBuffer) {
if (($len = strlen($ciphertext)) >= $this->block_size) {
$this->decryptIV = substr($ciphertext, -$this->block_size);
} else {
$this->decryptIV = substr($this->decryptIV, $len - $this->block_size) . substr($ciphertext, -$len);
}
}
break;
case self::MODE_OFB:
$plaintext = $this->_openssl_ofb_process($ciphertext, $this->decryptIV, $this->debuffer);
}
@ -1235,6 +1278,24 @@ abstract class Base
$pos = $len;
}
break;
case self::MODE_CFB8:
$plaintext = '';
$len = strlen($ciphertext);
$iv = $this->decryptIV;
for ($i = 0; $i < $len; ++$i) {
$plaintext .= $ciphertext[$i] ^ $this->_encryptBlock($iv);
$iv = substr($iv, 1) . $ciphertext[$i];
}
if ($this->continuousBuffer) {
if ($len >= $block_size) {
$this->decryptIV = substr($ciphertext, -$block_size);
} else {
$this->decryptIV = substr($this->decryptIV, $len - $block_size) . substr($ciphertext, -$len);
}
}
break;
case self::MODE_OFB:
$xor = $this->decryptIV;
if (strlen($buffer['xor'])) {
@ -1435,6 +1496,8 @@ abstract class Base
return 'ctr';
case self::MODE_CFB:
return 'cfb';
case self::MODE_CFB8:
return 'cfb8';
case self::MODE_OFB:
return 'ofb';
}
@ -1788,6 +1851,7 @@ abstract class Base
self::MODE_ECB => MCRYPT_MODE_ECB,
self::MODE_CBC => MCRYPT_MODE_CBC,
self::MODE_CFB => 'ncfb',
self::MODE_CFB8 => MCRYPT_MODE_CFB,
self::MODE_OFB => MCRYPT_MODE_NOFB,
self::MODE_STREAM => MCRYPT_MODE_STREAM,
);
@ -2359,6 +2423,52 @@ abstract class Base
$_pos = $_len;
}
return $_plaintext;
';
break;
case self::MODE_CFB8:
$encrypt = $init_encrypt . '
$_ciphertext = "";
$_len = strlen($_text);
$_iv = $self->encryptIV;
for ($_i = 0; $_i < $_len; ++$_i) {
$in = $_iv;
'.$encrypt_block.'
$_ciphertext .= ($_c = $_text[$_i] ^ $in);
$_iv = substr($_iv, 1) . $_c;
}
if ($self->continuousBuffer) {
if ($_len >= '.$block_size.') {
$self->encryptIV = substr($_ciphertext, -'.$block_size.');
} else {
$self->encryptIV = substr($self->encryptIV, $_len - '.$block_size.') . substr($_ciphertext, -$_len);
}
}
return $_ciphertext;
';
$decrypt = $init_encrypt . '
$_plaintext = "";
$_len = strlen($_text);
$_iv = $self->decryptIV;
for ($_i = 0; $_i < $_len; ++$_i) {
$in = $_iv;
'.$encrypt_block.'
$_plaintext .= $_text[$_i] ^ $in;
$_iv = substr($_iv, 1) . $_text[$_i];
}
if ($self->continuousBuffer) {
if ($_len >= '.$block_size.') {
$self->decryptIV = substr($_text, -'.$block_size.');
} else {
$self->decryptIV = substr($self->decryptIV, $_len - '.$block_size.') . substr($_text, -$_len);
}
}
return $_plaintext;
';
break;

2
tests/Unit/Crypt/AES/TestCase.php
View File

@ -39,6 +39,7 @@ abstract class Unit_Crypt_AES_TestCase extends PhpseclibTestCase
Base::MODE_CTR,
Base::MODE_OFB,
Base::MODE_CFB,
Base::MODE_CFB8,
);
$plaintexts = array(
'',
@ -136,6 +137,7 @@ abstract class Unit_Crypt_AES_TestCase extends PhpseclibTestCase
Base::MODE_CTR,
Base::MODE_OFB,
Base::MODE_CFB,
Base::MODE_CFB8,
);
$combos = array(