phpseclib\Crypt\DES Class Reference

Inheritance diagram for phpseclib\Crypt\DES:

Collaboration diagram for phpseclib\Crypt\DES:

Public Member Functions
	isValidEngine ($engine)
	Test for engine validity. More...
	setKey ($key)
	Sets the key. More...
	_encryptBlock ($in)
	Encrypts a block. More...
	_decryptBlock ($in)
	Decrypts a block. More...
	_processBlock ($block, $mode)
	Encrypts or decrypts a 64-bit block. More...
	_setupKey ()
	Creates the key schedule. More...
	_setupInlineCrypt ()
	Setup the performance-optimized function for de/encrypt() More...
Public Member Functions inherited from phpseclib\Crypt\Base
	__construct ($mode=self::MODE_CBC)
	Default Constructor. More...
	setIV ($iv)
	Sets the initialization vector. More...
	setKeyLength ($length)
	Sets the key length. More...
	getKeyLength ()
	Returns the current key length in bits. More...
	getBlockLength ()
	Returns the current block length in bits. More...
	setKey ($key)
	Sets the key. More...
	setPassword ($password, $method='pbkdf2')
	Sets the password. More...
	encrypt ($plaintext)
	Encrypts a message. More...
	decrypt ($ciphertext)
	Decrypts a message. More...
	_openssl_ctr_process ($plaintext, &$encryptIV, &$buffer)
	OpenSSL CTR Processor. More...
	_openssl_ofb_process ($plaintext, &$encryptIV, &$buffer)
	OpenSSL OFB Processor. More...
	_openssl_translate_mode ()
	phpseclib <-> OpenSSL Mode Mapper More...
	enablePadding ()
	Pad "packets". More...
	disablePadding ()
	Do not pad packets. More...
	enableContinuousBuffer ()
	Treat consecutive "packets" as if they are a continuous buffer. More...
	disableContinuousBuffer ()
	Treat consecutive packets as if they are a discontinuous buffer. More...
	isValidEngine ($engine)
	Test for engine validity. More...
	setPreferredEngine ($engine)
	Sets the preferred crypt engine. More...
	getEngine ()
	Returns the engine currently being utilized. More...
	_setEngine ()
	Sets the engine as appropriate. More...
	_encryptBlock ($in)
	Encrypts a block. More...
	_decryptBlock ($in)
	Decrypts a block. More...
	_setupKey ()
	Setup the key (expansion) More...
	_setup ()
	Setup the self::ENGINE_INTERNAL $engine. More...
	_setupMcrypt ()
	Setup the self::ENGINE_MCRYPT $engine. More...
	_pad ($text)
	Pads a string. More...
	_unpad ($text)
	Unpads a string. More...
	_clearBuffers ()
	Clears internal buffers. More...
	_string_shift (&$string, $index=1)
	String Shift. More...
	_string_pop (&$string, $index=1)
	String Pop. More...
	_increment_str (&$var)
	Increment the current string. More...
	_setupInlineCrypt ()
	Setup the performance-optimized function for de/encrypt() More...
	_createInlineCryptFunction ($cipher_code)
	Creates the performance-optimized function for en/decrypt() More...
&	_getLambdaFunctions ()
	Holds the lambda_functions table (classwide) More...
	_hashInlineCryptFunction ($bytes)
	Generates a digest from $bytes. More...

Data Fields
const	ENCRYPT = 0
	#+ @access private More...
const	DECRYPT = 1
	Contains $keys[self::DECRYPT]. More...
	$block_size = 8
	$key_length = 8
	$cipher_name_mcrypt = 'des'
	$openssl_mode_names
	$cfb_init_len = 500
	$des_rounds = 1
	$key_length_max = 8
	$keys
	$shuffle
	$ipmap
	$invipmap
	$sbox1
	$sbox2
	$sbox3
	$sbox4
	$sbox5
	$sbox6
	$sbox7
	$sbox8
Data Fields inherited from phpseclib\Crypt\Base
const	MODE_CTR = -1
	#+ @access public More...
const	MODE_ECB = 1
	Encrypt / decrypt using the Electronic Code Book mode. More...
const	MODE_CBC = 2
	Encrypt / decrypt using the Code Book Chaining mode. More...
const	MODE_CFB = 3
	Encrypt / decrypt using the Cipher Feedback mode. More...
const	MODE_OFB = 4
	Encrypt / decrypt using the Output Feedback mode. More...
const	MODE_STREAM = 5
	Encrypt / decrypt using streaming mode. More...
const	ENGINE_INTERNAL = 1
	#+ @access private More...
const	ENGINE_MCRYPT = 2
	Base value for the mcrypt implementation $engine switch. More...
const	ENGINE_OPENSSL = 3
	Base value for the mcrypt implementation $engine switch. More...
	$mode
	$block_size = 16
	$key = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
	$iv
	$encryptIV
	$decryptIV
	$continuousBuffer = false
	$enbuffer
	$debuffer
	$enmcrypt
	$demcrypt
	$enchanged = true
	$dechanged = true
	$ecb
	$cfb_init_len = 600
	$changed = true
	$padding = true
	$paddable = false
	$engine
	$preferredEngine
	$cipher_name_mcrypt
	$cipher_name_openssl
	$cipher_name_openssl_ecb
	$password_default_salt = 'phpseclib/salt'
	$inline_crypt
	$use_inline_crypt
	$openssl_emulate_ctr = false
	$openssl_options
	$explicit_key_length = false
	$skip_key_adjustment = false

Additional Inherited Members
Static Public Attributes inherited from phpseclib\Crypt\Base
static	$WHIRLPOOL_AVAILABLE

Detailed Description

Definition at line 54 of file DES.php.

Member Function Documentation

_decryptBlock()

phpseclib\Crypt\DES::_decryptBlock

(

$in

)

Decrypts a block.

See also

\phpseclib\Crypt\Base::_decryptBlock()

\phpseclib\Crypt\Base::decrypt()

self::decrypt() @access private

Parameters

string

$in

Returns

string

Reimplemented from phpseclib\Crypt\Base.

Definition at line 657 of file DES.php.

    {
        return $this->_processBlock($in, self::DECRYPT);
    }

References $in, and phpseclib\Crypt\DES\_processBlock().

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_encryptBlock()

phpseclib\Crypt\DES::_encryptBlock

(

$in

)

Encrypts a block.

See also

\phpseclib\Crypt\Base::_encryptBlock()

\phpseclib\Crypt\Base::encrypt()

self::encrypt() @access private

Parameters

string

$in

Returns

string

Reimplemented from phpseclib\Crypt\Base.

Definition at line 642 of file DES.php.

    {
        return $this->_processBlock($in, self::ENCRYPT);
    }

References $in, and phpseclib\Crypt\DES\_processBlock().

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_processBlock()

phpseclib\Crypt\DES::_processBlock	(		$block,
			$mode
	)

Encrypts or decrypts a 64-bit block.

$mode should be either self::ENCRYPT or self::DECRYPT. See Feistel.png to get a general idea of what this function does.

See also

self::_encryptBlock()

self::_decryptBlock() @access private

Parameters

string	$block
int	$mode

Returns

string

Definition at line 676 of file DES.php.

    {
        static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip;
        if (!$sbox1) {
            $sbox1 = array_map("intval", $this->sbox1);
            $sbox2 = array_map("intval", $this->sbox2);
            $sbox3 = array_map("intval", $this->sbox3);
            $sbox4 = array_map("intval", $this->sbox4);
            $sbox5 = array_map("intval", $this->sbox5);
            $sbox6 = array_map("intval", $this->sbox6);
            $sbox7 = array_map("intval", $this->sbox7);
            $sbox8 = array_map("intval", $this->sbox8);
            /* Merge $shuffle with $[inv]ipmap */
            for ($i = 0; $i < 256; ++$i) {
                $shuffleip[]    =  $this->shuffle[$this->ipmap[$i]];
                $shuffleinvip[] =  $this->shuffle[$this->invipmap[$i]];
            }
        }
 
        $keys  = $this->keys[$mode];
        $ki    = -1;
 
        // Do the initial IP permutation.
        $t = unpack('Nl/Nr', $block);
        list($l, $r) = array($t['l'], $t['r']);
        $block = ($shuffleip[ $r        & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
                 ($shuffleip[($r >>  8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
                 ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
                 ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
                 ($shuffleip[ $l        & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
                 ($shuffleip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
                 ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
                 ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
 
        // Extract L0 and R0.
        $t = unpack('Nl/Nr', $block);
        list($l, $r) = array($t['l'], $t['r']);
 
        for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) {
            // Perform the 16 steps.
            for ($i = 0; $i < 16; $i++) {
                // start of "the Feistel (F) function" - see the following URL:
                // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
                // Merge key schedule.
                $b1 = (($r >>  3) & 0x1FFFFFFF) ^ ($r << 29) ^ $keys[++$ki];
                $b2 = (($r >> 31) & 0x00000001) ^ ($r <<  1) ^ $keys[++$ki];
 
                // S-box indexing.
                $t = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^
                     $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^
                     $sbox5[($b1 >>  8) & 0x3F] ^ $sbox6[($b2 >>  8) & 0x3F] ^
                     $sbox7[ $b1        & 0x3F] ^ $sbox8[ $b2        & 0x3F] ^ $l;
                // end of "the Feistel (F) function"
 
                $l = $r;
                $r = $t;
            }
 
            // Last step should not permute L & R.
            $t = $l;
            $l = $r;
            $r = $t;
        }
 
        // Perform the inverse IP permutation.
        return ($shuffleinvip[($r >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
               ($shuffleinvip[($l >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
               ($shuffleinvip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
               ($shuffleinvip[($l >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
               ($shuffleinvip[($r >>  8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
               ($shuffleinvip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
               ($shuffleinvip[ $r        & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
               ($shuffleinvip[ $l        & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
    }

References phpseclib\Crypt\DES\$des_rounds, $i, phpseclib\Crypt\DES\$keys, $l, phpseclib\Crypt\Base\$mode, $r, phpseclib\Crypt\DES\$sbox1, phpseclib\Crypt\DES\$sbox2, phpseclib\Crypt\DES\$sbox3, phpseclib\Crypt\DES\$sbox4, phpseclib\Crypt\DES\$sbox5, phpseclib\Crypt\DES\$sbox6, phpseclib\Crypt\DES\$sbox7, phpseclib\Crypt\DES\$sbox8, and $t.

Referenced by phpseclib\Crypt\DES\_decryptBlock(), and phpseclib\Crypt\DES\_encryptBlock().

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_setupInlineCrypt()

phpseclib\Crypt\DES::_setupInlineCrypt

(

)

Setup the performance-optimized function for de/encrypt()

See also

\phpseclib\Crypt\Base::_setupInlineCrypt() @access private

Reimplemented from phpseclib\Crypt\Base.

Definition at line 1292 of file DES.php.

    {
        $lambda_functions =& self::_getLambdaFunctions();
 
        // Engine configuration for:
        // -  DES ($des_rounds == 1) or
        // - 3DES ($des_rounds == 3)
        $des_rounds = $this->des_rounds;
 
        // We create max. 10 hi-optimized code for memory reason. Means: For each $key one ultra fast inline-crypt function.
        // (Currently, for DES, one generated $lambda_function cost on php5.5@32bit ~135kb unfreeable mem and ~230kb on php5.5@64bit)
        // (Currently, for TripleDES, one generated $lambda_function cost on php5.5@32bit ~240kb unfreeable mem and ~340kb on php5.5@64bit)
        // After that, we'll still create very fast optimized code but not the hi-ultimative code, for each $mode one
        $gen_hi_opt_code = (bool)( count($lambda_functions) < 10 );
 
        // Generation of a uniqe hash for our generated code
        $code_hash = "Crypt_DES, $des_rounds, {$this->mode}";
        if ($gen_hi_opt_code) {
            // For hi-optimized code, we create for each combination of
            // $mode, $des_rounds and $this->key its own encrypt/decrypt function.
            // After max 10 hi-optimized functions, we create generic
            // (still very fast.. but not ultra) functions for each $mode/$des_rounds
            // Currently 2 * 5 generic functions will be then max. possible.
            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
        }
 
        // Is there a re-usable $lambda_functions in there? If not, we have to create it.
        if (!isset($lambda_functions[$code_hash])) {
            // Init code for both, encrypt and decrypt.
            $init_crypt = 'static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip;
                if (!$sbox1) {
                    $sbox1 = array_map("intval", $self->sbox1);
                    $sbox2 = array_map("intval", $self->sbox2);
                    $sbox3 = array_map("intval", $self->sbox3);
                    $sbox4 = array_map("intval", $self->sbox4);
                    $sbox5 = array_map("intval", $self->sbox5);
                    $sbox6 = array_map("intval", $self->sbox6);
                    $sbox7 = array_map("intval", $self->sbox7);
                    $sbox8 = array_map("intval", $self->sbox8);'
                    /* Merge $shuffle with $[inv]ipmap */ . '
                    for ($i = 0; $i < 256; ++$i) {
                        $shuffleip[]    =  $self->shuffle[$self->ipmap[$i]];
                        $shuffleinvip[] =  $self->shuffle[$self->invipmap[$i]];
                    }
                }
            ';
 
            switch (true) {
                case $gen_hi_opt_code:
                    // In Hi-optimized code mode, we use our [3]DES key schedule as hardcoded integers.
                    // No futher initialisation of the $keys schedule is necessary.
                    // That is the extra performance boost.
                    $k = array(
                        self::ENCRYPT => $this->keys[self::ENCRYPT],
                        self::DECRYPT => $this->keys[self::DECRYPT]
                    );
                    $init_encrypt = '';
                    $init_decrypt = '';
                    break;
                default:
                    // In generic optimized code mode, we have to use, as the best compromise [currently],
                    // our key schedule as $ke/$kd arrays. (with hardcoded indexes...)
                    $k = array(
                        self::ENCRYPT => array(),
                        self::DECRYPT => array()
                    );
                    for ($i = 0, $c = count($this->keys[self::ENCRYPT]); $i < $c; ++$i) {
                        $k[self::ENCRYPT][$i] = '$ke[' . $i . ']';
                        $k[self::DECRYPT][$i] = '$kd[' . $i . ']';
                    }
                    $init_encrypt = '$ke = $self->keys[self::ENCRYPT];';
                    $init_decrypt = '$kd = $self->keys[self::DECRYPT];';
                    break;
            }
 
            // Creating code for en- and decryption.
            $crypt_block = array();
            foreach (array(self::ENCRYPT, self::DECRYPT) as $c) {
                /* Do the initial IP permutation. */
                $crypt_block[$c] = '
                    $in = unpack("N*", $in);
                    $l  = $in[1];
                    $r  = $in[2];
                    $in = unpack("N*",
                        ($shuffleip[ $r        & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
                        ($shuffleip[($r >>  8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
                        ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
                        ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
                        ($shuffleip[ $l        & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
                        ($shuffleip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
                        ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
                        ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01")
                    );
                    ' . /* Extract L0 and R0 */ '
                    $l = $in[1];
                    $r = $in[2];
                ';
 
                $l = '$l';
                $r = '$r';
 
                // Perform DES or 3DES.
                for ($ki = -1, $des_round = 0; $des_round < $des_rounds; ++$des_round) {
                    // Perform the 16 steps.
                    for ($i = 0; $i < 16; ++$i) {
                        // start of "the Feistel (F) function" - see the following URL:
                        // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
                        // Merge key schedule.
                        $crypt_block[$c].= '
                            $b1 = ((' . $r . ' >>  3) & 0x1FFFFFFF)  ^ (' . $r . ' << 29) ^ ' . $k[$c][++$ki] . ';
                            $b2 = ((' . $r . ' >> 31) & 0x00000001)  ^ (' . $r . ' <<  1) ^ ' . $k[$c][++$ki] . ';' .
                            /* S-box indexing. */
                            $l . ' = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^
                                     $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^
                                     $sbox5[($b1 >>  8) & 0x3F] ^ $sbox6[($b2 >>  8) & 0x3F] ^
                                     $sbox7[ $b1        & 0x3F] ^ $sbox8[ $b2        & 0x3F] ^ ' . $l . ';
                        ';
                        // end of "the Feistel (F) function"
 
                        // swap L & R
                        list($l, $r) = array($r, $l);
                    }
                    list($l, $r) = array($r, $l);
                }
 
                // Perform the inverse IP permutation.
                $crypt_block[$c].= '$in =
                    ($shuffleinvip[($l >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
                    ($shuffleinvip[($r >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
                    ($shuffleinvip[($l >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
                    ($shuffleinvip[($r >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
                    ($shuffleinvip[($l >>  8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
                    ($shuffleinvip[($r >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
                    ($shuffleinvip[ $l        & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
                    ($shuffleinvip[ $r        & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
                ';
            }
 
            // Creates the inline-crypt function
            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
                array(
                   'init_crypt'    => $init_crypt,
                   'init_encrypt'  => $init_encrypt,
                   'init_decrypt'  => $init_decrypt,
                   'encrypt_block' => $crypt_block[self::ENCRYPT],
                   'decrypt_block' => $crypt_block[self::DECRYPT]
                )
            );
        }
 
        // Set the inline-crypt function as callback in: $this->inline_crypt
        $this->inline_crypt = $lambda_functions[$code_hash];
    }

References $c, phpseclib\Crypt\DES\$des_rounds, $i, $l, $r, phpseclib\Crypt\Base\_createInlineCryptFunction(), phpseclib\Crypt\Base\_getLambdaFunctions(), phpseclib\Crypt\Base\_hashInlineCryptFunction(), phpseclib\Crypt\DES\DECRYPT, and phpseclib\Crypt\DES\ENCRYPT.

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_setupKey()

phpseclib\Crypt\DES::_setupKey

(

)

Creates the key schedule.

See also

\phpseclib\Crypt\Base::_setupKey() @access private

Reimplemented from phpseclib\Crypt\Base.

Reimplemented in phpseclib\Crypt\TripleDES.

Definition at line 757 of file DES.php.

    {
        if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->des_rounds === $this->kl['des_rounds']) {
            // already expanded
            return;
        }
        $this->kl = array('key' => $this->key, 'des_rounds' => $this->des_rounds);
 
        static $shifts = array( // number of key bits shifted per round
            1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
        );
 
        static $pc1map = array(
            0x00, 0x00, 0x08, 0x08, 0x04, 0x04, 0x0C, 0x0C,
            0x02, 0x02, 0x0A, 0x0A, 0x06, 0x06, 0x0E, 0x0E,
            0x10, 0x10, 0x18, 0x18, 0x14, 0x14, 0x1C, 0x1C,
            0x12, 0x12, 0x1A, 0x1A, 0x16, 0x16, 0x1E, 0x1E,
            0x20, 0x20, 0x28, 0x28, 0x24, 0x24, 0x2C, 0x2C,
            0x22, 0x22, 0x2A, 0x2A, 0x26, 0x26, 0x2E, 0x2E,
            0x30, 0x30, 0x38, 0x38, 0x34, 0x34, 0x3C, 0x3C,
            0x32, 0x32, 0x3A, 0x3A, 0x36, 0x36, 0x3E, 0x3E,
            0x40, 0x40, 0x48, 0x48, 0x44, 0x44, 0x4C, 0x4C,
            0x42, 0x42, 0x4A, 0x4A, 0x46, 0x46, 0x4E, 0x4E,
            0x50, 0x50, 0x58, 0x58, 0x54, 0x54, 0x5C, 0x5C,
            0x52, 0x52, 0x5A, 0x5A, 0x56, 0x56, 0x5E, 0x5E,
            0x60, 0x60, 0x68, 0x68, 0x64, 0x64, 0x6C, 0x6C,
            0x62, 0x62, 0x6A, 0x6A, 0x66, 0x66, 0x6E, 0x6E,
            0x70, 0x70, 0x78, 0x78, 0x74, 0x74, 0x7C, 0x7C,
            0x72, 0x72, 0x7A, 0x7A, 0x76, 0x76, 0x7E, 0x7E,
            0x80, 0x80, 0x88, 0x88, 0x84, 0x84, 0x8C, 0x8C,
            0x82, 0x82, 0x8A, 0x8A, 0x86, 0x86, 0x8E, 0x8E,
            0x90, 0x90, 0x98, 0x98, 0x94, 0x94, 0x9C, 0x9C,
            0x92, 0x92, 0x9A, 0x9A, 0x96, 0x96, 0x9E, 0x9E,
            0xA0, 0xA0, 0xA8, 0xA8, 0xA4, 0xA4, 0xAC, 0xAC,
            0xA2, 0xA2, 0xAA, 0xAA, 0xA6, 0xA6, 0xAE, 0xAE,
            0xB0, 0xB0, 0xB8, 0xB8, 0xB4, 0xB4, 0xBC, 0xBC,
            0xB2, 0xB2, 0xBA, 0xBA, 0xB6, 0xB6, 0xBE, 0xBE,
            0xC0, 0xC0, 0xC8, 0xC8, 0xC4, 0xC4, 0xCC, 0xCC,
            0xC2, 0xC2, 0xCA, 0xCA, 0xC6, 0xC6, 0xCE, 0xCE,
            0xD0, 0xD0, 0xD8, 0xD8, 0xD4, 0xD4, 0xDC, 0xDC,
            0xD2, 0xD2, 0xDA, 0xDA, 0xD6, 0xD6, 0xDE, 0xDE,
            0xE0, 0xE0, 0xE8, 0xE8, 0xE4, 0xE4, 0xEC, 0xEC,
            0xE2, 0xE2, 0xEA, 0xEA, 0xE6, 0xE6, 0xEE, 0xEE,
            0xF0, 0xF0, 0xF8, 0xF8, 0xF4, 0xF4, 0xFC, 0xFC,
            0xF2, 0xF2, 0xFA, 0xFA, 0xF6, 0xF6, 0xFE, 0xFE
        );
 
        // Mapping tables for the PC-2 transformation.
        static $pc2mapc1 = array(
            0x00000000, 0x00000400, 0x00200000, 0x00200400,
            0x00000001, 0x00000401, 0x00200001, 0x00200401,
            0x02000000, 0x02000400, 0x02200000, 0x02200400,
            0x02000001, 0x02000401, 0x02200001, 0x02200401
        );
        static $pc2mapc2 = array(
            0x00000000, 0x00000800, 0x08000000, 0x08000800,
            0x00010000, 0x00010800, 0x08010000, 0x08010800,
            0x00000000, 0x00000800, 0x08000000, 0x08000800,
            0x00010000, 0x00010800, 0x08010000, 0x08010800,
            0x00000100, 0x00000900, 0x08000100, 0x08000900,
            0x00010100, 0x00010900, 0x08010100, 0x08010900,
            0x00000100, 0x00000900, 0x08000100, 0x08000900,
            0x00010100, 0x00010900, 0x08010100, 0x08010900,
            0x00000010, 0x00000810, 0x08000010, 0x08000810,
            0x00010010, 0x00010810, 0x08010010, 0x08010810,
            0x00000010, 0x00000810, 0x08000010, 0x08000810,
            0x00010010, 0x00010810, 0x08010010, 0x08010810,
            0x00000110, 0x00000910, 0x08000110, 0x08000910,
            0x00010110, 0x00010910, 0x08010110, 0x08010910,
            0x00000110, 0x00000910, 0x08000110, 0x08000910,
            0x00010110, 0x00010910, 0x08010110, 0x08010910,
            0x00040000, 0x00040800, 0x08040000, 0x08040800,
            0x00050000, 0x00050800, 0x08050000, 0x08050800,
            0x00040000, 0x00040800, 0x08040000, 0x08040800,
            0x00050000, 0x00050800, 0x08050000, 0x08050800,
            0x00040100, 0x00040900, 0x08040100, 0x08040900,
            0x00050100, 0x00050900, 0x08050100, 0x08050900,
            0x00040100, 0x00040900, 0x08040100, 0x08040900,
            0x00050100, 0x00050900, 0x08050100, 0x08050900,
            0x00040010, 0x00040810, 0x08040010, 0x08040810,
            0x00050010, 0x00050810, 0x08050010, 0x08050810,
            0x00040010, 0x00040810, 0x08040010, 0x08040810,
            0x00050010, 0x00050810, 0x08050010, 0x08050810,
            0x00040110, 0x00040910, 0x08040110, 0x08040910,
            0x00050110, 0x00050910, 0x08050110, 0x08050910,
            0x00040110, 0x00040910, 0x08040110, 0x08040910,
            0x00050110, 0x00050910, 0x08050110, 0x08050910,
            0x01000000, 0x01000800, 0x09000000, 0x09000800,
            0x01010000, 0x01010800, 0x09010000, 0x09010800,
            0x01000000, 0x01000800, 0x09000000, 0x09000800,
            0x01010000, 0x01010800, 0x09010000, 0x09010800,
            0x01000100, 0x01000900, 0x09000100, 0x09000900,
            0x01010100, 0x01010900, 0x09010100, 0x09010900,
            0x01000100, 0x01000900, 0x09000100, 0x09000900,
            0x01010100, 0x01010900, 0x09010100, 0x09010900,
            0x01000010, 0x01000810, 0x09000010, 0x09000810,
            0x01010010, 0x01010810, 0x09010010, 0x09010810,
            0x01000010, 0x01000810, 0x09000010, 0x09000810,
            0x01010010, 0x01010810, 0x09010010, 0x09010810,
            0x01000110, 0x01000910, 0x09000110, 0x09000910,
            0x01010110, 0x01010910, 0x09010110, 0x09010910,
            0x01000110, 0x01000910, 0x09000110, 0x09000910,
            0x01010110, 0x01010910, 0x09010110, 0x09010910,
            0x01040000, 0x01040800, 0x09040000, 0x09040800,
            0x01050000, 0x01050800, 0x09050000, 0x09050800,
            0x01040000, 0x01040800, 0x09040000, 0x09040800,
            0x01050000, 0x01050800, 0x09050000, 0x09050800,
            0x01040100, 0x01040900, 0x09040100, 0x09040900,
            0x01050100, 0x01050900, 0x09050100, 0x09050900,
            0x01040100, 0x01040900, 0x09040100, 0x09040900,
            0x01050100, 0x01050900, 0x09050100, 0x09050900,
            0x01040010, 0x01040810, 0x09040010, 0x09040810,
            0x01050010, 0x01050810, 0x09050010, 0x09050810,
            0x01040010, 0x01040810, 0x09040010, 0x09040810,
            0x01050010, 0x01050810, 0x09050010, 0x09050810,
            0x01040110, 0x01040910, 0x09040110, 0x09040910,
            0x01050110, 0x01050910, 0x09050110, 0x09050910,
            0x01040110, 0x01040910, 0x09040110, 0x09040910,
            0x01050110, 0x01050910, 0x09050110, 0x09050910
        );
        static $pc2mapc3 = array(
            0x00000000, 0x00000004, 0x00001000, 0x00001004,
            0x00000000, 0x00000004, 0x00001000, 0x00001004,
            0x10000000, 0x10000004, 0x10001000, 0x10001004,
            0x10000000, 0x10000004, 0x10001000, 0x10001004,
            0x00000020, 0x00000024, 0x00001020, 0x00001024,
            0x00000020, 0x00000024, 0x00001020, 0x00001024,
            0x10000020, 0x10000024, 0x10001020, 0x10001024,
            0x10000020, 0x10000024, 0x10001020, 0x10001024,
            0x00080000, 0x00080004, 0x00081000, 0x00081004,
            0x00080000, 0x00080004, 0x00081000, 0x00081004,
            0x10080000, 0x10080004, 0x10081000, 0x10081004,
            0x10080000, 0x10080004, 0x10081000, 0x10081004,
            0x00080020, 0x00080024, 0x00081020, 0x00081024,
            0x00080020, 0x00080024, 0x00081020, 0x00081024,
            0x10080020, 0x10080024, 0x10081020, 0x10081024,
            0x10080020, 0x10080024, 0x10081020, 0x10081024,
            0x20000000, 0x20000004, 0x20001000, 0x20001004,
            0x20000000, 0x20000004, 0x20001000, 0x20001004,
            0x30000000, 0x30000004, 0x30001000, 0x30001004,
            0x30000000, 0x30000004, 0x30001000, 0x30001004,
            0x20000020, 0x20000024, 0x20001020, 0x20001024,
            0x20000020, 0x20000024, 0x20001020, 0x20001024,
            0x30000020, 0x30000024, 0x30001020, 0x30001024,
            0x30000020, 0x30000024, 0x30001020, 0x30001024,
            0x20080000, 0x20080004, 0x20081000, 0x20081004,
            0x20080000, 0x20080004, 0x20081000, 0x20081004,
            0x30080000, 0x30080004, 0x30081000, 0x30081004,
            0x30080000, 0x30080004, 0x30081000, 0x30081004,
            0x20080020, 0x20080024, 0x20081020, 0x20081024,
            0x20080020, 0x20080024, 0x20081020, 0x20081024,
            0x30080020, 0x30080024, 0x30081020, 0x30081024,
            0x30080020, 0x30080024, 0x30081020, 0x30081024,
            0x00000002, 0x00000006, 0x00001002, 0x00001006,
            0x00000002, 0x00000006, 0x00001002, 0x00001006,
            0x10000002, 0x10000006, 0x10001002, 0x10001006,
            0x10000002, 0x10000006, 0x10001002, 0x10001006,
            0x00000022, 0x00000026, 0x00001022, 0x00001026,
            0x00000022, 0x00000026, 0x00001022, 0x00001026,
            0x10000022, 0x10000026, 0x10001022, 0x10001026,
            0x10000022, 0x10000026, 0x10001022, 0x10001026,
            0x00080002, 0x00080006, 0x00081002, 0x00081006,
            0x00080002, 0x00080006, 0x00081002, 0x00081006,
            0x10080002, 0x10080006, 0x10081002, 0x10081006,
            0x10080002, 0x10080006, 0x10081002, 0x10081006,
            0x00080022, 0x00080026, 0x00081022, 0x00081026,
            0x00080022, 0x00080026, 0x00081022, 0x00081026,
            0x10080022, 0x10080026, 0x10081022, 0x10081026,
            0x10080022, 0x10080026, 0x10081022, 0x10081026,
            0x20000002, 0x20000006, 0x20001002, 0x20001006,
            0x20000002, 0x20000006, 0x20001002, 0x20001006,
            0x30000002, 0x30000006, 0x30001002, 0x30001006,
            0x30000002, 0x30000006, 0x30001002, 0x30001006,
            0x20000022, 0x20000026, 0x20001022, 0x20001026,
            0x20000022, 0x20000026, 0x20001022, 0x20001026,
            0x30000022, 0x30000026, 0x30001022, 0x30001026,
            0x30000022, 0x30000026, 0x30001022, 0x30001026,
            0x20080002, 0x20080006, 0x20081002, 0x20081006,
            0x20080002, 0x20080006, 0x20081002, 0x20081006,
            0x30080002, 0x30080006, 0x30081002, 0x30081006,
            0x30080002, 0x30080006, 0x30081002, 0x30081006,
            0x20080022, 0x20080026, 0x20081022, 0x20081026,
            0x20080022, 0x20080026, 0x20081022, 0x20081026,
            0x30080022, 0x30080026, 0x30081022, 0x30081026,
            0x30080022, 0x30080026, 0x30081022, 0x30081026
        );
        static $pc2mapc4 = array(
            0x00000000, 0x00100000, 0x00000008, 0x00100008,
            0x00000200, 0x00100200, 0x00000208, 0x00100208,
            0x00000000, 0x00100000, 0x00000008, 0x00100008,
            0x00000200, 0x00100200, 0x00000208, 0x00100208,
            0x04000000, 0x04100000, 0x04000008, 0x04100008,
            0x04000200, 0x04100200, 0x04000208, 0x04100208,
            0x04000000, 0x04100000, 0x04000008, 0x04100008,
            0x04000200, 0x04100200, 0x04000208, 0x04100208,
            0x00002000, 0x00102000, 0x00002008, 0x00102008,
            0x00002200, 0x00102200, 0x00002208, 0x00102208,
            0x00002000, 0x00102000, 0x00002008, 0x00102008,
            0x00002200, 0x00102200, 0x00002208, 0x00102208,
            0x04002000, 0x04102000, 0x04002008, 0x04102008,
            0x04002200, 0x04102200, 0x04002208, 0x04102208,
            0x04002000, 0x04102000, 0x04002008, 0x04102008,
            0x04002200, 0x04102200, 0x04002208, 0x04102208,
            0x00000000, 0x00100000, 0x00000008, 0x00100008,
            0x00000200, 0x00100200, 0x00000208, 0x00100208,
            0x00000000, 0x00100000, 0x00000008, 0x00100008,
            0x00000200, 0x00100200, 0x00000208, 0x00100208,
            0x04000000, 0x04100000, 0x04000008, 0x04100008,
            0x04000200, 0x04100200, 0x04000208, 0x04100208,
            0x04000000, 0x04100000, 0x04000008, 0x04100008,
            0x04000200, 0x04100200, 0x04000208, 0x04100208,
            0x00002000, 0x00102000, 0x00002008, 0x00102008,
            0x00002200, 0x00102200, 0x00002208, 0x00102208,
            0x00002000, 0x00102000, 0x00002008, 0x00102008,
            0x00002200, 0x00102200, 0x00002208, 0x00102208,
            0x04002000, 0x04102000, 0x04002008, 0x04102008,
            0x04002200, 0x04102200, 0x04002208, 0x04102208,
            0x04002000, 0x04102000, 0x04002008, 0x04102008,
            0x04002200, 0x04102200, 0x04002208, 0x04102208,
            0x00020000, 0x00120000, 0x00020008, 0x00120008,
            0x00020200, 0x00120200, 0x00020208, 0x00120208,
            0x00020000, 0x00120000, 0x00020008, 0x00120008,
            0x00020200, 0x00120200, 0x00020208, 0x00120208,
            0x04020000, 0x04120000, 0x04020008, 0x04120008,
            0x04020200, 0x04120200, 0x04020208, 0x04120208,
            0x04020000, 0x04120000, 0x04020008, 0x04120008,
            0x04020200, 0x04120200, 0x04020208, 0x04120208,
            0x00022000, 0x00122000, 0x00022008, 0x00122008,
            0x00022200, 0x00122200, 0x00022208, 0x00122208,
            0x00022000, 0x00122000, 0x00022008, 0x00122008,
            0x00022200, 0x00122200, 0x00022208, 0x00122208,
            0x04022000, 0x04122000, 0x04022008, 0x04122008,
            0x04022200, 0x04122200, 0x04022208, 0x04122208,
            0x04022000, 0x04122000, 0x04022008, 0x04122008,
            0x04022200, 0x04122200, 0x04022208, 0x04122208,
            0x00020000, 0x00120000, 0x00020008, 0x00120008,
            0x00020200, 0x00120200, 0x00020208, 0x00120208,
            0x00020000, 0x00120000, 0x00020008, 0x00120008,
            0x00020200, 0x00120200, 0x00020208, 0x00120208,
            0x04020000, 0x04120000, 0x04020008, 0x04120008,
            0x04020200, 0x04120200, 0x04020208, 0x04120208,
            0x04020000, 0x04120000, 0x04020008, 0x04120008,
            0x04020200, 0x04120200, 0x04020208, 0x04120208,
            0x00022000, 0x00122000, 0x00022008, 0x00122008,
            0x00022200, 0x00122200, 0x00022208, 0x00122208,
            0x00022000, 0x00122000, 0x00022008, 0x00122008,
            0x00022200, 0x00122200, 0x00022208, 0x00122208,
            0x04022000, 0x04122000, 0x04022008, 0x04122008,
            0x04022200, 0x04122200, 0x04022208, 0x04122208,
            0x04022000, 0x04122000, 0x04022008, 0x04122008,
            0x04022200, 0x04122200, 0x04022208, 0x04122208
        );
        static $pc2mapd1 = array(
            0x00000000, 0x00000001, 0x08000000, 0x08000001,
            0x00200000, 0x00200001, 0x08200000, 0x08200001,
            0x00000002, 0x00000003, 0x08000002, 0x08000003,
            0x00200002, 0x00200003, 0x08200002, 0x08200003
        );
        static $pc2mapd2 = array(
            0x00000000, 0x00100000, 0x00000800, 0x00100800,
            0x00000000, 0x00100000, 0x00000800, 0x00100800,
            0x04000000, 0x04100000, 0x04000800, 0x04100800,
            0x04000000, 0x04100000, 0x04000800, 0x04100800,
            0x00000004, 0x00100004, 0x00000804, 0x00100804,
            0x00000004, 0x00100004, 0x00000804, 0x00100804,
            0x04000004, 0x04100004, 0x04000804, 0x04100804,
            0x04000004, 0x04100004, 0x04000804, 0x04100804,
            0x00000000, 0x00100000, 0x00000800, 0x00100800,
            0x00000000, 0x00100000, 0x00000800, 0x00100800,
            0x04000000, 0x04100000, 0x04000800, 0x04100800,
            0x04000000, 0x04100000, 0x04000800, 0x04100800,
            0x00000004, 0x00100004, 0x00000804, 0x00100804,
            0x00000004, 0x00100004, 0x00000804, 0x00100804,
            0x04000004, 0x04100004, 0x04000804, 0x04100804,
            0x04000004, 0x04100004, 0x04000804, 0x04100804,
            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
            0x00020000, 0x00120000, 0x00020800, 0x00120800,
            0x00020000, 0x00120000, 0x00020800, 0x00120800,
            0x04020000, 0x04120000, 0x04020800, 0x04120800,
            0x04020000, 0x04120000, 0x04020800, 0x04120800,
            0x00020004, 0x00120004, 0x00020804, 0x00120804,
            0x00020004, 0x00120004, 0x00020804, 0x00120804,
            0x04020004, 0x04120004, 0x04020804, 0x04120804,
            0x04020004, 0x04120004, 0x04020804, 0x04120804,
            0x00020000, 0x00120000, 0x00020800, 0x00120800,
            0x00020000, 0x00120000, 0x00020800, 0x00120800,
            0x04020000, 0x04120000, 0x04020800, 0x04120800,
            0x04020000, 0x04120000, 0x04020800, 0x04120800,
            0x00020004, 0x00120004, 0x00020804, 0x00120804,
            0x00020004, 0x00120004, 0x00020804, 0x00120804,
            0x04020004, 0x04120004, 0x04020804, 0x04120804,
            0x04020004, 0x04120004, 0x04020804, 0x04120804,
            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
            0x04020204, 0x04120204, 0x04020A04, 0x04120A04
        );
        static $pc2mapd3 = array(
            0x00000000, 0x00010000, 0x02000000, 0x02010000,
            0x00000020, 0x00010020, 0x02000020, 0x02010020,
            0x00040000, 0x00050000, 0x02040000, 0x02050000,
            0x00040020, 0x00050020, 0x02040020, 0x02050020,
            0x00002000, 0x00012000, 0x02002000, 0x02012000,
            0x00002020, 0x00012020, 0x02002020, 0x02012020,
            0x00042000, 0x00052000, 0x02042000, 0x02052000,
            0x00042020, 0x00052020, 0x02042020, 0x02052020,
            0x00000000, 0x00010000, 0x02000000, 0x02010000,
            0x00000020, 0x00010020, 0x02000020, 0x02010020,
            0x00040000, 0x00050000, 0x02040000, 0x02050000,
            0x00040020, 0x00050020, 0x02040020, 0x02050020,
            0x00002000, 0x00012000, 0x02002000, 0x02012000,
            0x00002020, 0x00012020, 0x02002020, 0x02012020,
            0x00042000, 0x00052000, 0x02042000, 0x02052000,
            0x00042020, 0x00052020, 0x02042020, 0x02052020,
            0x00000010, 0x00010010, 0x02000010, 0x02010010,
            0x00000030, 0x00010030, 0x02000030, 0x02010030,
            0x00040010, 0x00050010, 0x02040010, 0x02050010,
            0x00040030, 0x00050030, 0x02040030, 0x02050030,
            0x00002010, 0x00012010, 0x02002010, 0x02012010,
            0x00002030, 0x00012030, 0x02002030, 0x02012030,
            0x00042010, 0x00052010, 0x02042010, 0x02052010,
            0x00042030, 0x00052030, 0x02042030, 0x02052030,
            0x00000010, 0x00010010, 0x02000010, 0x02010010,
            0x00000030, 0x00010030, 0x02000030, 0x02010030,
            0x00040010, 0x00050010, 0x02040010, 0x02050010,
            0x00040030, 0x00050030, 0x02040030, 0x02050030,
            0x00002010, 0x00012010, 0x02002010, 0x02012010,
            0x00002030, 0x00012030, 0x02002030, 0x02012030,
            0x00042010, 0x00052010, 0x02042010, 0x02052010,
            0x00042030, 0x00052030, 0x02042030, 0x02052030,
            0x20000000, 0x20010000, 0x22000000, 0x22010000,
            0x20000020, 0x20010020, 0x22000020, 0x22010020,
            0x20040000, 0x20050000, 0x22040000, 0x22050000,
            0x20040020, 0x20050020, 0x22040020, 0x22050020,
            0x20002000, 0x20012000, 0x22002000, 0x22012000,
            0x20002020, 0x20012020, 0x22002020, 0x22012020,
            0x20042000, 0x20052000, 0x22042000, 0x22052000,
            0x20042020, 0x20052020, 0x22042020, 0x22052020,
            0x20000000, 0x20010000, 0x22000000, 0x22010000,
            0x20000020, 0x20010020, 0x22000020, 0x22010020,
            0x20040000, 0x20050000, 0x22040000, 0x22050000,
            0x20040020, 0x20050020, 0x22040020, 0x22050020,
            0x20002000, 0x20012000, 0x22002000, 0x22012000,
            0x20002020, 0x20012020, 0x22002020, 0x22012020,
            0x20042000, 0x20052000, 0x22042000, 0x22052000,
            0x20042020, 0x20052020, 0x22042020, 0x22052020,
            0x20000010, 0x20010010, 0x22000010, 0x22010010,
            0x20000030, 0x20010030, 0x22000030, 0x22010030,
            0x20040010, 0x20050010, 0x22040010, 0x22050010,
            0x20040030, 0x20050030, 0x22040030, 0x22050030,
            0x20002010, 0x20012010, 0x22002010, 0x22012010,
            0x20002030, 0x20012030, 0x22002030, 0x22012030,
            0x20042010, 0x20052010, 0x22042010, 0x22052010,
            0x20042030, 0x20052030, 0x22042030, 0x22052030,
            0x20000010, 0x20010010, 0x22000010, 0x22010010,
            0x20000030, 0x20010030, 0x22000030, 0x22010030,
            0x20040010, 0x20050010, 0x22040010, 0x22050010,
            0x20040030, 0x20050030, 0x22040030, 0x22050030,
            0x20002010, 0x20012010, 0x22002010, 0x22012010,
            0x20002030, 0x20012030, 0x22002030, 0x22012030,
            0x20042010, 0x20052010, 0x22042010, 0x22052010,
            0x20042030, 0x20052030, 0x22042030, 0x22052030
        );
        static $pc2mapd4 = array(
            0x00000000, 0x00000400, 0x01000000, 0x01000400,
            0x00000000, 0x00000400, 0x01000000, 0x01000400,
            0x00000100, 0x00000500, 0x01000100, 0x01000500,
            0x00000100, 0x00000500, 0x01000100, 0x01000500,
            0x10000000, 0x10000400, 0x11000000, 0x11000400,
            0x10000000, 0x10000400, 0x11000000, 0x11000400,
            0x10000100, 0x10000500, 0x11000100, 0x11000500,
            0x10000100, 0x10000500, 0x11000100, 0x11000500,
            0x00080000, 0x00080400, 0x01080000, 0x01080400,
            0x00080000, 0x00080400, 0x01080000, 0x01080400,
            0x00080100, 0x00080500, 0x01080100, 0x01080500,
            0x00080100, 0x00080500, 0x01080100, 0x01080500,
            0x10080000, 0x10080400, 0x11080000, 0x11080400,
            0x10080000, 0x10080400, 0x11080000, 0x11080400,
            0x10080100, 0x10080500, 0x11080100, 0x11080500,
            0x10080100, 0x10080500, 0x11080100, 0x11080500,
            0x00000008, 0x00000408, 0x01000008, 0x01000408,
            0x00000008, 0x00000408, 0x01000008, 0x01000408,
            0x00000108, 0x00000508, 0x01000108, 0x01000508,
            0x00000108, 0x00000508, 0x01000108, 0x01000508,
            0x10000008, 0x10000408, 0x11000008, 0x11000408,
            0x10000008, 0x10000408, 0x11000008, 0x11000408,
            0x10000108, 0x10000508, 0x11000108, 0x11000508,
            0x10000108, 0x10000508, 0x11000108, 0x11000508,
            0x00080008, 0x00080408, 0x01080008, 0x01080408,
            0x00080008, 0x00080408, 0x01080008, 0x01080408,
            0x00080108, 0x00080508, 0x01080108, 0x01080508,
            0x00080108, 0x00080508, 0x01080108, 0x01080508,
            0x10080008, 0x10080408, 0x11080008, 0x11080408,
            0x10080008, 0x10080408, 0x11080008, 0x11080408,
            0x10080108, 0x10080508, 0x11080108, 0x11080508,
            0x10080108, 0x10080508, 0x11080108, 0x11080508,
            0x00001000, 0x00001400, 0x01001000, 0x01001400,
            0x00001000, 0x00001400, 0x01001000, 0x01001400,
            0x00001100, 0x00001500, 0x01001100, 0x01001500,
            0x00001100, 0x00001500, 0x01001100, 0x01001500,
            0x10001000, 0x10001400, 0x11001000, 0x11001400,
            0x10001000, 0x10001400, 0x11001000, 0x11001400,
            0x10001100, 0x10001500, 0x11001100, 0x11001500,
            0x10001100, 0x10001500, 0x11001100, 0x11001500,
            0x00081000, 0x00081400, 0x01081000, 0x01081400,
            0x00081000, 0x00081400, 0x01081000, 0x01081400,
            0x00081100, 0x00081500, 0x01081100, 0x01081500,
            0x00081100, 0x00081500, 0x01081100, 0x01081500,
            0x10081000, 0x10081400, 0x11081000, 0x11081400,
            0x10081000, 0x10081400, 0x11081000, 0x11081400,
            0x10081100, 0x10081500, 0x11081100, 0x11081500,
            0x10081100, 0x10081500, 0x11081100, 0x11081500,
            0x00001008, 0x00001408, 0x01001008, 0x01001408,
            0x00001008, 0x00001408, 0x01001008, 0x01001408,
            0x00001108, 0x00001508, 0x01001108, 0x01001508,
            0x00001108, 0x00001508, 0x01001108, 0x01001508,
            0x10001008, 0x10001408, 0x11001008, 0x11001408,
            0x10001008, 0x10001408, 0x11001008, 0x11001408,
            0x10001108, 0x10001508, 0x11001108, 0x11001508,
            0x10001108, 0x10001508, 0x11001108, 0x11001508,
            0x00081008, 0x00081408, 0x01081008, 0x01081408,
            0x00081008, 0x00081408, 0x01081008, 0x01081408,
            0x00081108, 0x00081508, 0x01081108, 0x01081508,
            0x00081108, 0x00081508, 0x01081108, 0x01081508,
            0x10081008, 0x10081408, 0x11081008, 0x11081408,
            0x10081008, 0x10081408, 0x11081008, 0x11081408,
            0x10081108, 0x10081508, 0x11081108, 0x11081508,
            0x10081108, 0x10081508, 0x11081108, 0x11081508
        );
 
        $keys = array();
        for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) {
            // pad the key and remove extra characters as appropriate.
            $key = str_pad(substr($this->key, $des_round * 8, 8), 8, "\0");
 
            // Perform the PC/1 transformation and compute C and D.
            $t = unpack('Nl/Nr', $key);
            list($l, $r) = array($t['l'], $t['r']);
            $key = ($this->shuffle[$pc1map[ $r        & 0xFF]] & "\x80\x80\x80\x80\x80\x80\x80\x00") |
                   ($this->shuffle[$pc1map[($r >>  8) & 0xFF]] & "\x40\x40\x40\x40\x40\x40\x40\x00") |
                   ($this->shuffle[$pc1map[($r >> 16) & 0xFF]] & "\x20\x20\x20\x20\x20\x20\x20\x00") |
                   ($this->shuffle[$pc1map[($r >> 24) & 0xFF]] & "\x10\x10\x10\x10\x10\x10\x10\x00") |
                   ($this->shuffle[$pc1map[ $l        & 0xFF]] & "\x08\x08\x08\x08\x08\x08\x08\x00") |
                   ($this->shuffle[$pc1map[($l >>  8) & 0xFF]] & "\x04\x04\x04\x04\x04\x04\x04\x00") |
                   ($this->shuffle[$pc1map[($l >> 16) & 0xFF]] & "\x02\x02\x02\x02\x02\x02\x02\x00") |
                   ($this->shuffle[$pc1map[($l >> 24) & 0xFF]] & "\x01\x01\x01\x01\x01\x01\x01\x00");
            $key = unpack('Nc/Nd', $key);
            $c = ( $key['c'] >> 4) & 0x0FFFFFFF;
            $d = (($key['d'] >> 4) & 0x0FFFFFF0) | ($key['c'] & 0x0F);
 
            $keys[$des_round] = array(
                self::ENCRYPT => array(),
                self::DECRYPT => array_fill(0, 32, 0)
            );
            for ($i = 0, $ki = 31; $i < 16; ++$i, $ki-= 2) {
                $c <<= $shifts[$i];
                $c = ($c | ($c >> 28)) & 0x0FFFFFFF;
                $d <<= $shifts[$i];
                $d = ($d | ($d >> 28)) & 0x0FFFFFFF;
 
                // Perform the PC-2 transformation.
                $cp = $pc2mapc1[ $c >> 24        ] | $pc2mapc2[($c >> 16) & 0xFF] |
                      $pc2mapc3[($c >>  8) & 0xFF] | $pc2mapc4[ $c        & 0xFF];
                $dp = $pc2mapd1[ $d >> 24        ] | $pc2mapd2[($d >> 16) & 0xFF] |
                      $pc2mapd3[($d >>  8) & 0xFF] | $pc2mapd4[ $d        & 0xFF];
 
                // Reorder: odd bytes/even bytes. Push the result in key schedule.
                $val1 = ( $cp        & 0xFF000000) | (($cp <<  8) & 0x00FF0000) |
                        (($dp >> 16) & 0x0000FF00) | (($dp >>  8) & 0x000000FF);
                $val2 = (($cp <<  8) & 0xFF000000) | (($cp << 16) & 0x00FF0000) |
                        (($dp >>  8) & 0x0000FF00) | ( $dp        & 0x000000FF);
                $keys[$des_round][self::ENCRYPT][       ] = $val1;
                $keys[$des_round][self::DECRYPT][$ki - 1] = $val1;
                $keys[$des_round][self::ENCRYPT][       ] = $val2;
                $keys[$des_round][self::DECRYPT][$ki    ] = $val2;
            }
        }
 
        switch ($this->des_rounds) {
            case 3: // 3DES keys
                $this->keys = array(
                    self::ENCRYPT => array_merge(
                        $keys[0][self::ENCRYPT],
                        $keys[1][self::DECRYPT],
                        $keys[2][self::ENCRYPT]
                    ),
                    self::DECRYPT => array_merge(
                        $keys[2][self::DECRYPT],
                        $keys[1][self::ENCRYPT],
                        $keys[0][self::DECRYPT]
                    )
                );
                break;
            // case 1: // DES keys
            default:
                $this->keys = array(
                    self::ENCRYPT => $keys[0][self::ENCRYPT],
                    self::DECRYPT => $keys[0][self::DECRYPT]
                );
        }
    }

References $c, $d, phpseclib\Crypt\DES\$des_rounds, $i, phpseclib\Crypt\Base\$key, phpseclib\Crypt\DES\$keys, $l, $r, $t, phpseclib\Crypt\DES\DECRYPT, and phpseclib\Crypt\DES\ENCRYPT.

isValidEngine()

phpseclib\Crypt\DES::isValidEngine

(

$engine

)

Test for engine validity.

This is mainly just a wrapper to set things up for \phpseclib\Crypt\Base::isValidEngine()

See also

\phpseclib\Crypt\Base::isValidEngine()

Parameters

int

$engine

@access public

Returns

bool

Reimplemented from phpseclib\Crypt\Base.

Reimplemented in phpseclib\Crypt\TripleDES.

Definition at line 593 of file DES.php.

    {
        if ($this->key_length_max == 8) {
            if ($engine == self::ENGINE_OPENSSL) {
                $this->cipher_name_openssl_ecb = 'des-ecb';
                $this->cipher_name_openssl = 'des-' . $this->_openssl_translate_mode();
            }
        }
 
        return parent::isValidEngine($engine);
    }

References phpseclib\Crypt\Base\$engine, and phpseclib\Crypt\Base\_openssl_translate_mode().

Here is the call graph for this function:

setKey()

phpseclib\Crypt\DES::setKey

(

$key

)

Sets the key.

Keys can be of any length. DES, itself, uses 64-bit keys (eg. strlen($key) == 8), however, we only use the first eight, if $key has more then eight characters in it, and pad $key with the null byte if it is less then eight characters long.

DES also requires that every eighth bit be a parity bit, however, we'll ignore that.

If the key is not explicitly set, it'll be assumed to be all zero's.

See also

\phpseclib\Crypt\Base::setKey() @access User interface

Parameters

string

$key

Reimplemented from phpseclib\Crypt\Base.

Reimplemented in phpseclib\Crypt\TripleDES.

Definition at line 620 of file DES.php.

    {
        // We check/cut here only up to max length of the key.
        // Key padding to the proper length will be done in _setupKey()
        if (strlen($key) > $this->key_length_max) {
            $key = substr($key, 0, $this->key_length_max);
        }
 
        // Sets the key
        parent::setKey($key);
    }

References phpseclib\Crypt\Base\$key.

Field Documentation

$block_size

phpseclib\Crypt\DES::$block_size = 8

Definition at line 78 of file DES.php.

$cfb_init_len

phpseclib\Crypt\DES::$cfb_init_len = 500

Definition at line 120 of file DES.php.

$cipher_name_mcrypt

phpseclib\Crypt\DES::$cipher_name_mcrypt = 'des'

Definition at line 96 of file DES.php.

$des_rounds

phpseclib\Crypt\DES::$des_rounds = 1

Definition at line 132 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock(), phpseclib\Crypt\DES\_setupInlineCrypt(), and phpseclib\Crypt\DES\_setupKey().

$invipmap

phpseclib\Crypt\DES::$invipmap

Definition at line 345 of file DES.php.

$ipmap

phpseclib\Crypt\DES::$ipmap

Definition at line 303 of file DES.php.

$key_length

phpseclib\Crypt\DES::$key_length = 8

Definition at line 87 of file DES.php.

$key_length_max

phpseclib\Crypt\DES::$key_length_max = 8

Definition at line 141 of file DES.php.

$keys

phpseclib\Crypt\DES::$keys

Definition at line 150 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock(), and phpseclib\Crypt\DES\_setupKey().

$openssl_mode_names

phpseclib\Crypt\DES::$openssl_mode_names

Initial value:

= array(
        self::MODE_ECB => 'des-ecb',
        self::MODE_CBC => 'des-cbc',
        self::MODE_CFB => 'des-cfb',
        self::MODE_OFB => 'des-ofb'
        
    )

Definition at line 105 of file DES.php.

$sbox1

phpseclib\Crypt\DES::$sbox1

Initial value:

= array(
        0x00808200, 0x00000000, 0x00008000, 0x00808202,
        0x00808002, 0x00008202, 0x00000002, 0x00008000,
        0x00000200, 0x00808200, 0x00808202, 0x00000200,
        0x00800202, 0x00808002, 0x00800000, 0x00000002,
        0x00000202, 0x00800200, 0x00800200, 0x00008200,
        0x00008200, 0x00808000, 0x00808000, 0x00800202,
        0x00008002, 0x00800002, 0x00800002, 0x00008002,
        0x00000000, 0x00000202, 0x00008202, 0x00800000,
        0x00008000, 0x00808202, 0x00000002, 0x00808000,
        0x00808200, 0x00800000, 0x00800000, 0x00000200,
        0x00808002, 0x00008000, 0x00008200, 0x00800002,
        0x00000200, 0x00000002, 0x00800202, 0x00008202,
        0x00808202, 0x00008002, 0x00808000, 0x00800202,
        0x00800002, 0x00000202, 0x00008202, 0x00808200,
        0x00000202, 0x00800200, 0x00800200, 0x00000000,
        0x00008002, 0x00008200, 0x00000000, 0x00808002
    )

Definition at line 389 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock().

$sbox2

phpseclib\Crypt\DES::$sbox2

Initial value:

= array(
        0x40084010, 0x40004000, 0x00004000, 0x00084010,
        0x00080000, 0x00000010, 0x40080010, 0x40004010,
        0x40000010, 0x40084010, 0x40084000, 0x40000000,
        0x40004000, 0x00080000, 0x00000010, 0x40080010,
        0x00084000, 0x00080010, 0x40004010, 0x00000000,
        0x40000000, 0x00004000, 0x00084010, 0x40080000,
        0x00080010, 0x40000010, 0x00000000, 0x00084000,
        0x00004010, 0x40084000, 0x40080000, 0x00004010,
        0x00000000, 0x00084010, 0x40080010, 0x00080000,
        0x40004010, 0x40080000, 0x40084000, 0x00004000,
        0x40080000, 0x40004000, 0x00000010, 0x40084010,
        0x00084010, 0x00000010, 0x00004000, 0x40000000,
        0x00004010, 0x40084000, 0x00080000, 0x40000010,
        0x00080010, 0x40004010, 0x40000010, 0x00080010,
        0x00084000, 0x00000000, 0x40004000, 0x00004010,
        0x40000000, 0x40080010, 0x40084010, 0x00084000
    )

Definition at line 414 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock().

$sbox3

phpseclib\Crypt\DES::$sbox3

Initial value:

= array(
        0x00000104, 0x04010100, 0x00000000, 0x04010004,
        0x04000100, 0x00000000, 0x00010104, 0x04000100,
        0x00010004, 0x04000004, 0x04000004, 0x00010000,
        0x04010104, 0x00010004, 0x04010000, 0x00000104,
        0x04000000, 0x00000004, 0x04010100, 0x00000100,
        0x00010100, 0x04010000, 0x04010004, 0x00010104,
        0x04000104, 0x00010100, 0x00010000, 0x04000104,
        0x00000004, 0x04010104, 0x00000100, 0x04000000,
        0x04010100, 0x04000000, 0x00010004, 0x00000104,
        0x00010000, 0x04010100, 0x04000100, 0x00000000,
        0x00000100, 0x00010004, 0x04010104, 0x04000100,
        0x04000004, 0x00000100, 0x00000000, 0x04010004,
        0x04000104, 0x00010000, 0x04000000, 0x04010104,
        0x00000004, 0x00010104, 0x00010100, 0x04000004,
        0x04010000, 0x04000104, 0x00000104, 0x04010000,
        0x00010104, 0x00000004, 0x04010004, 0x00010100
    )

Definition at line 439 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock().

$sbox4

phpseclib\Crypt\DES::$sbox4

Initial value:

= array(
        0x80401000, 0x80001040, 0x80001040, 0x00000040,
        0x00401040, 0x80400040, 0x80400000, 0x80001000,
        0x00000000, 0x00401000, 0x00401000, 0x80401040,
        0x80000040, 0x00000000, 0x00400040, 0x80400000,
        0x80000000, 0x00001000, 0x00400000, 0x80401000,
        0x00000040, 0x00400000, 0x80001000, 0x00001040,
        0x80400040, 0x80000000, 0x00001040, 0x00400040,
        0x00001000, 0x00401040, 0x80401040, 0x80000040,
        0x00400040, 0x80400000, 0x00401000, 0x80401040,
        0x80000040, 0x00000000, 0x00000000, 0x00401000,
        0x00001040, 0x00400040, 0x80400040, 0x80000000,
        0x80401000, 0x80001040, 0x80001040, 0x00000040,
        0x80401040, 0x80000040, 0x80000000, 0x00001000,
        0x80400000, 0x80001000, 0x00401040, 0x80400040,
        0x80001000, 0x00001040, 0x00400000, 0x80401000,
        0x00000040, 0x00400000, 0x00001000, 0x00401040
    )

Definition at line 464 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock().

$sbox5

phpseclib\Crypt\DES::$sbox5

Initial value:

= array(
        0x00000080, 0x01040080, 0x01040000, 0x21000080,
        0x00040000, 0x00000080, 0x20000000, 0x01040000,
        0x20040080, 0x00040000, 0x01000080, 0x20040080,
        0x21000080, 0x21040000, 0x00040080, 0x20000000,
        0x01000000, 0x20040000, 0x20040000, 0x00000000,
        0x20000080, 0x21040080, 0x21040080, 0x01000080,
        0x21040000, 0x20000080, 0x00000000, 0x21000000,
        0x01040080, 0x01000000, 0x21000000, 0x00040080,
        0x00040000, 0x21000080, 0x00000080, 0x01000000,
        0x20000000, 0x01040000, 0x21000080, 0x20040080,
        0x01000080, 0x20000000, 0x21040000, 0x01040080,
        0x20040080, 0x00000080, 0x01000000, 0x21040000,
        0x21040080, 0x00040080, 0x21000000, 0x21040080,
        0x01040000, 0x00000000, 0x20040000, 0x21000000,
        0x00040080, 0x01000080, 0x20000080, 0x00040000,
        0x00000000, 0x20040000, 0x01040080, 0x20000080
    )

Definition at line 489 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock().

$sbox6

phpseclib\Crypt\DES::$sbox6

Initial value:

= array(
        0x10000008, 0x10200000, 0x00002000, 0x10202008,
        0x10200000, 0x00000008, 0x10202008, 0x00200000,
        0x10002000, 0x00202008, 0x00200000, 0x10000008,
        0x00200008, 0x10002000, 0x10000000, 0x00002008,
        0x00000000, 0x00200008, 0x10002008, 0x00002000,
        0x00202000, 0x10002008, 0x00000008, 0x10200008,
        0x10200008, 0x00000000, 0x00202008, 0x10202000,
        0x00002008, 0x00202000, 0x10202000, 0x10000000,
        0x10002000, 0x00000008, 0x10200008, 0x00202000,
        0x10202008, 0x00200000, 0x00002008, 0x10000008,
        0x00200000, 0x10002000, 0x10000000, 0x00002008,
        0x10000008, 0x10202008, 0x00202000, 0x10200000,
        0x00202008, 0x10202000, 0x00000000, 0x10200008,
        0x00000008, 0x00002000, 0x10200000, 0x00202008,
        0x00002000, 0x00200008, 0x10002008, 0x00000000,
        0x10202000, 0x10000000, 0x00200008, 0x10002008
    )

Definition at line 514 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock().

$sbox7

phpseclib\Crypt\DES::$sbox7

Initial value:

= array(
        0x00100000, 0x02100001, 0x02000401, 0x00000000,
        0x00000400, 0x02000401, 0x00100401, 0x02100400,
        0x02100401, 0x00100000, 0x00000000, 0x02000001,
        0x00000001, 0x02000000, 0x02100001, 0x00000401,
        0x02000400, 0x00100401, 0x00100001, 0x02000400,
        0x02000001, 0x02100000, 0x02100400, 0x00100001,
        0x02100000, 0x00000400, 0x00000401, 0x02100401,
        0x00100400, 0x00000001, 0x02000000, 0x00100400,
        0x02000000, 0x00100400, 0x00100000, 0x02000401,
        0x02000401, 0x02100001, 0x02100001, 0x00000001,
        0x00100001, 0x02000000, 0x02000400, 0x00100000,
        0x02100400, 0x00000401, 0x00100401, 0x02100400,
        0x00000401, 0x02000001, 0x02100401, 0x02100000,
        0x00100400, 0x00000000, 0x00000001, 0x02100401,
        0x00000000, 0x00100401, 0x02100000, 0x00000400,
        0x02000001, 0x02000400, 0x00000400, 0x00100001
    )

Definition at line 539 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock().

$sbox8

phpseclib\Crypt\DES::$sbox8

Initial value:

= array(
        0x08000820, 0x00000800, 0x00020000, 0x08020820,
        0x08000000, 0x08000820, 0x00000020, 0x08000000,
        0x00020020, 0x08020000, 0x08020820, 0x00020800,
        0x08020800, 0x00020820, 0x00000800, 0x00000020,
        0x08020000, 0x08000020, 0x08000800, 0x00000820,
        0x00020800, 0x00020020, 0x08020020, 0x08020800,
        0x00000820, 0x00000000, 0x00000000, 0x08020020,
        0x08000020, 0x08000800, 0x00020820, 0x00020000,
        0x00020820, 0x00020000, 0x08020800, 0x00000800,
        0x00000020, 0x08020020, 0x00000800, 0x00020820,
        0x08000800, 0x00000020, 0x08000020, 0x08020000,
        0x08020020, 0x08000000, 0x00020000, 0x08000820,
        0x00000000, 0x08020820, 0x00020020, 0x08000020,
        0x08020000, 0x08000800, 0x08000820, 0x00000000,
        0x08020820, 0x00020800, 0x00020800, 0x00000820,
        0x00000820, 0x00020020, 0x08000000, 0x08020800
    )

Definition at line 564 of file DES.php.

Referenced by phpseclib\Crypt\DES\_processBlock().

$shuffle

phpseclib\Crypt\DES::$shuffle

Definition at line 164 of file DES.php.

DECRYPT

const phpseclib\Crypt\DES::DECRYPT = 1

Contains $keys[self::DECRYPT].

Definition at line 68 of file DES.php.

Referenced by phpseclib\Crypt\DES\_setupInlineCrypt(), and phpseclib\Crypt\DES\_setupKey().

ENCRYPT

const phpseclib\Crypt\DES::ENCRYPT = 0

#+ @access private

See also

\phpseclib\Crypt\DES::_setupKey()

\phpseclib\Crypt\DES::_processBlock() Contains $keys[self::ENCRYPT]

Definition at line 64 of file DES.php.

Referenced by phpseclib\Crypt\DES\_setupInlineCrypt(), and phpseclib\Crypt\DES\_setupKey().

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The documentation for this class was generated from the following file:

• libs/composer/vendor/phpseclib/phpseclib/phpseclib/Crypt/DES.php