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RC2: Changes according to arguments in https://github.com/phpseclib/phpseclib/pull/124

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This commit is contained in:
Patrick Monnerat 2013-06-28 16:32:06 +02:00
parent a76558541c
commit e644c42efa
1 changed files with 116 additions and 10 deletions
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126
phpseclib/Crypt/RC2.php
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@ -149,7 +149,7 @@ class Crypt_RC2 extends Crypt_Base {
* @var Integer
* @access private
*/
var $password_key_size = 128; // = 1024 bits
var $password_key_size = 16; // = 128 bits
/**
* The namespace used by the cipher for its constants.
@ -178,6 +178,18 @@ class Crypt_RC2 extends Crypt_Base {
*/
var $cfb_init_len = 500;
/**
* The key length in bits.
*
* @see Crypt_RC2::setKeyLength()
* @see Crypt_RC2::setKey()
* @var Integer
* @access private
* @internal Should be in range [1..1024].
* @internal Changing this value after setting the key has no effect.
*/
var $default_key_length = 1024;
/**
* The Key Schedule
*
@ -189,14 +201,45 @@ class Crypt_RC2 extends Crypt_Base {
/**
* Key expansion randomization table.
* The inverse table (invpitable) will be calculated at run time.
* Twice the same 256-value sequence to save a modulus in key expansion.
*
* @see Crypt_RC2::Crypt_RC2()
* @see Crypt_RC2::setKey()
* @var Array
* @access private
*/
var $pitable = array(
0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13,
0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B,
0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1,
0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57,
0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7,
0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74,
0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A,
0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE,
0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0,
0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77,
0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD,
0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
@ -231,6 +274,48 @@ class Crypt_RC2 extends Crypt_Base {
0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD
);
/**
* Inverse key expansion randomization table.
*
* @see Crypt_RC2::setKey()
* @var Array
* @access private
*/
var $invpitable = array(
0xD1, 0xDA, 0xB9, 0x6F, 0x9C, 0xC8, 0x78, 0x66,
0x80, 0x2C, 0xF8, 0x37, 0xEA, 0xE0, 0x62, 0xA4,
0xCB, 0x71, 0x50, 0x27, 0x4B, 0x95, 0xD9, 0x20,
0x9D, 0x04, 0x91, 0xE3, 0x47, 0x6A, 0x7E, 0x53,
0xFA, 0x3A, 0x3B, 0xB4, 0xA8, 0xBC, 0x5F, 0x68,
0x08, 0xCA, 0x8F, 0x14, 0xD7, 0xC0, 0xEF, 0x7B,
0x5B, 0xBF, 0x2F, 0xE5, 0xE2, 0x8C, 0xBA, 0x12,
0xE1, 0xAF, 0xB2, 0x54, 0x5D, 0x59, 0x76, 0xDB,
0x32, 0xA2, 0x58, 0x6E, 0x1C, 0x29, 0x64, 0xF3,
0xE9, 0x96, 0x0C, 0x98, 0x19, 0x8D, 0x3E, 0x26,
0xAB, 0xA5, 0x85, 0x16, 0x40, 0xBD, 0x49, 0x67,
0xDC, 0x22, 0x94, 0xBB, 0x3C, 0xC1, 0x9B, 0xEB,
0x45, 0x28, 0x18, 0xD8, 0x1A, 0x42, 0x7D, 0xCC,
0xFB, 0x65, 0x8E, 0x3D, 0xCD, 0x2A, 0xA3, 0x60,
0xAE, 0x93, 0x8A, 0x48, 0x97, 0x51, 0x15, 0xF7,
0x01, 0x0B, 0xB7, 0x36, 0xB1, 0x2E, 0x11, 0xFD,
0x84, 0x2D, 0x3F, 0x13, 0x88, 0xB3, 0x34, 0x24,
0x1B, 0xDE, 0xC5, 0x1D, 0x4D, 0x2B, 0x17, 0x31,
0x74, 0xA9, 0xC6, 0x43, 0x6D, 0x39, 0x90, 0xBE,
0xC3, 0xB0, 0x21, 0x6B, 0xF6, 0x0F, 0xD5, 0x99,
0x0D, 0xAC, 0x1F, 0x5C, 0x9E, 0xF5, 0xF9, 0x4C,
0xD6, 0xDF, 0x89, 0xE4, 0x8B, 0xFF, 0xC7, 0xAA,
0xE7, 0xED, 0x46, 0x25, 0xB6, 0x06, 0x5E, 0x35,
0xB5, 0xEC, 0xCE, 0xE8, 0x6C, 0x30, 0x55, 0x61,
0x4A, 0xFE, 0xA0, 0x79, 0x03, 0xF0, 0x10, 0x72,
0x7C, 0xCF, 0x52, 0xA6, 0xA7, 0xEE, 0x44, 0xD3,
0x9A, 0x57, 0x92, 0xD0, 0x5A, 0x7A, 0x41, 0x7F,
0x0E, 0x00, 0x63, 0xF2, 0x4F, 0x05, 0x83, 0xC9,
0xA1, 0xD4, 0xDD, 0xC4, 0x56, 0xF4, 0xD2, 0x77,
0x81, 0x09, 0x82, 0x33, 0x9F, 0x07, 0x86, 0x75,
0x38, 0x4E, 0x69, 0xF1, 0xAD, 0x23, 0x73, 0x87,
0x70, 0x02, 0xC2, 0x1E, 0xB8, 0x0A, 0xFC, 0xE6
);
/**
* Default Constructor.
*
@ -260,6 +345,23 @@ class Crypt_RC2 extends Crypt_Base {
$this->setKey('');
}
/**
* Sets the key length
*
* Valid key lengths are 1 to 1024.
* Calling this function after setting the key has no effect until the next
* Crypt_RC2::setKey() call.
*
* @access public
* @param Integer $length in bits
*/
function setKeyLength($length)
{
if ($length >= 1 && $length <= 1024) {
$this->default_key_length = $length;
}
}
/**
* Sets the key.
*
@ -276,9 +378,14 @@ class Crypt_RC2 extends Crypt_Base {
* @param String $key
* @param Integer $t1 optional Effective key length in bits.
*/
function setKey($key, $t1 = 1024)
function setKey($key, $t1 = 0)
{
// Key length should be 1..128.
if ($t1 <= 0) {
$t1 = $this->default_key_length;
} else if ($t1 > 1024) {
$t1 = 1024;
}
// Key byte count should be 1..128.
$key = strlen($key) ? substr($key, 0, 128): "\x00";
$t = strlen($key);
@ -288,16 +395,13 @@ class Crypt_RC2 extends Crypt_Base {
// inverse pitable mapping to the first byte before submitting it
// to mcrypt.
// Setting up the [inv]pitable
$invpitable = array_flip($this->pitable);
$pitable = array_merge($this->pitable, $this->pitable);// Avoid a later modulus operation.
// Key expansion.
$l = array_values(unpack('C*', $key));
$t8 = ($t1 + 7) >> 3;
$tm = 0xFF >> (8 * $t8 - $t1);
// Expand key.
$pitable = $this->pitable;
for ($i = $t; $i < 128; $i++) {
$l[$i] = $pitable[$l[$i - 1] + $l[$i - $t]];
}
@ -308,7 +412,7 @@ class Crypt_RC2 extends Crypt_Base {
}
// Prepare the key for mcrypt.
$l[0] = $invpitable[$l[0]];
$l[0] = $this->invpitable[$l[0]];
array_unshift($l, 'C*');
parent::setKey(call_user_func_array('pack', $l));
}
@ -411,6 +515,8 @@ class Crypt_RC2 extends Crypt_Base {
*/
function _setupKey()
{
// Key has already been expanded in Crypt_RC2::setKey():
// Only the first value must be altered.
$l = unpack('Ca/Cb/v*', $this->key);
array_unshift($l, $this->pitable[$l['a']] | ($l['b'] << 8));
unset($l['a']);