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Merge pull request #65 from petrich/patch-3

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Rijndael: Performance update
This commit is contained in:
terrafrost 2013-01-26 16:29:26 -08:00
commit 7894fd98f5
1 changed files with 78 additions and 56 deletions
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134
phpseclib/Crypt/Rijndael.php
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@ -510,13 +510,13 @@ class Crypt_Rijndael {
); );
for ($i = 0; $i < 256; $i++) { for ($i = 0; $i < 256; $i++) {
$t2[$i << 8] = (($t3[$i] << 8) & 0xFFFFFF00) | (($t3[$i] >> 24) & 0x000000FF); $t2[] = (($t3[$i] << 8) & 0xFFFFFF00) | (($t3[$i] >> 24) & 0x000000FF);
$t1[$i << 16] = (($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) & 0x0000FFFF); $t1[] = (($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) & 0x0000FFFF);
$t0[$i << 24] = (($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >> 8) & 0x00FFFFFF); $t0[] = (($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >> 8) & 0x00FFFFFF);
$dt2[$i << 8] = (($this->dt3[$i] << 8) & 0xFFFFFF00) | (($dt3[$i] >> 24) & 0x000000FF); $dt2[] = (($dt3[$i] << 8) & 0xFFFFFF00) | (($dt3[$i] >> 24) & 0x000000FF);
$dt1[$i << 16] = (($this->dt3[$i] << 16) & 0xFFFF0000) | (($dt3[$i] >> 16) & 0x0000FFFF); $dt1[] = (($dt3[$i] << 16) & 0xFFFF0000) | (($dt3[$i] >> 16) & 0x0000FFFF);
$dt0[$i << 24] = (($this->dt3[$i] << 24) & 0xFF000000) | (($dt3[$i] >> 8) & 0x00FFFFFF); $dt0[] = (($dt3[$i] << 24) & 0xFF000000) | (($dt3[$i] >> 8) & 0x00FFFFFF);
} }
} }
@ -719,7 +719,6 @@ class Crypt_Rijndael {
$block_size = $this->block_size; $block_size = $this->block_size;
$buffer = &$this->enbuffer; $buffer = &$this->enbuffer;
$continuousBuffer = $this->continuousBuffer;
$ciphertext = ''; $ciphertext = '';
switch ($this->mode) { switch ($this->mode) {
case CRYPT_RIJNDAEL_MODE_ECB: case CRYPT_RIJNDAEL_MODE_ECB:
@ -853,7 +852,6 @@ class Crypt_Rijndael {
$block_size = $this->block_size; $block_size = $this->block_size;
$buffer = &$this->debuffer; $buffer = &$this->debuffer;
$continuousBuffer = $this->continuousBuffer;
$plaintext = ''; $plaintext = '';
switch ($this->mode) { switch ($this->mode) {
case CRYPT_RIJNDAEL_MODE_ECB: case CRYPT_RIJNDAEL_MODE_ECB:
@ -985,9 +983,9 @@ class Crypt_Rijndael {
$c = $this->c; $c = $this->c;
// addRoundKey // addRoundKey
$i = 0; $i = -1;
foreach ($words as $word) { foreach ($words as $word) {
$state[] = $word ^ $w[0][$i++]; $state[] = $word ^ $w[0][++$i];
} }
// fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components - // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components -
@ -999,31 +997,28 @@ class Crypt_Rijndael {
// [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf // [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf
$temp = array(); $temp = array();
for ($round = 1; $round < $Nr; $round++) { for ($round = 1; $round < $Nr; ++$round) {
$i = 0; // $c[0] == 0 $i = 0; // $c[0] == 0
$j = $c[1]; $j = $c[1];
$k = $c[2]; $k = $c[2];
$l = $c[3]; $l = $c[3];
while ($i < $this->Nb) { while ($i < $Nb) {
$temp[$i] = $t0[$state[$i] & 0xFF000000] ^ $temp[$i] = $t0[$state[$i] >> 24 & 0x000000FF] ^
$t1[$state[$j] & 0x00FF0000] ^ $t1[$state[$j] >> 16 & 0x000000FF] ^
$t2[$state[$k] & 0x0000FF00] ^ $t2[$state[$k] >> 8 & 0x000000FF] ^
$t3[$state[$l] & 0x000000FF] ^ $t3[$state[$l] & 0x000000FF] ^
$w[$round][$i]; $w[$round][$i];
$i++; ++$i;
$j = ($j + 1) % $Nb; $j = ($j + 1) % $Nb;
$k = ($k + 1) % $Nb; $k = ($k + 1) % $Nb;
$l = ($l + 1) % $Nb; $l = ($l + 1) % $Nb;
} }
$state = $temp;
for ($i = 0; $i < $Nb; $i++) {
$state[$i] = $temp[$i];
}
} }
// subWord // subWord
for ($i = 0; $i < $Nb; $i++) { for ($i = 0; $i < $Nb; ++$i) {
$state[$i] = $this->_subWord($state[$i]); $state[$i] = $this->_subWord($state[$i]);
} }
@ -1032,22 +1027,38 @@ class Crypt_Rijndael {
$j = $c[1]; $j = $c[1];
$k = $c[2]; $k = $c[2];
$l = $c[3]; $l = $c[3];
while ($i < $this->Nb) { while ($i < $Nb) {
$temp[$i] = ($state[$i] & 0xFF000000) ^ $temp[$i] = ($state[$i] & 0xFF000000) ^
($state[$j] & 0x00FF0000) ^ ($state[$j] & 0x00FF0000) ^
($state[$k] & 0x0000FF00) ^ ($state[$k] & 0x0000FF00) ^
($state[$l] & 0x000000FF) ^ ($state[$l] & 0x000000FF) ^
$w[$Nr][$i]; $w[$Nr][$i];
$i++; ++$i;
$j = ($j + 1) % $Nb; $j = ($j + 1) % $Nb;
$k = ($k + 1) % $Nb; $k = ($k + 1) % $Nb;
$l = ($l + 1) % $Nb; $l = ($l + 1) % $Nb;
} }
// 100% ugly switch/case code... but ~5% faster (meaning: ~half second faster de/encrypting 1MB text, tested with php5.4.9 on linux/32bit with an AMD Athlon II P360 CPU) then the commented smart code below. Don't know it's worth or not
switch ($Nb) {
case 8:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6], $temp[7]);
case 7:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6]);
case 6:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5]);
case 5:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4]);
default:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3]);
}
/*
$state = $temp; $state = $temp;
array_unshift($state, 'N*'); array_unshift($state, 'N*');
return call_user_func_array('pack', $state); return call_user_func_array('pack', $state);
*/
} }
/** /**
@ -1062,7 +1073,6 @@ class Crypt_Rijndael {
$state = array(); $state = array();
$words = unpack('N*word', $in); $words = unpack('N*word', $in);
$num_states = count($state);
$dw = $this->dw; $dw = $this->dw;
$dt0 = $this->dt0; $dt0 = $this->dt0;
$dt1 = $this->dt1; $dt1 = $this->dt1;
@ -1073,33 +1083,30 @@ class Crypt_Rijndael {
$c = $this->c; $c = $this->c;
// addRoundKey // addRoundKey
$i = 0; $i = -1;
foreach ($words as $word) { foreach ($words as $word) {
$state[] = $word ^ $dw[$Nr][$i++]; $state[] = $word ^ $dw[$Nr][++$i];
} }
$temp = array(); $temp = array();
for ($round = $Nr - 1; $round > 0; $round--) { for ($round = $Nr - 1; $round > 0; --$round) {
$i = 0; // $c[0] == 0 $i = 0; // $c[0] == 0
$j = $Nb - $c[1]; $j = $Nb - $c[1];
$k = $Nb - $c[2]; $k = $Nb - $c[2];
$l = $Nb - $c[3]; $l = $Nb - $c[3];
while ($i < $Nb) { while ($i < $Nb) {
$temp[$i] = $dt0[$state[$i] & 0xFF000000] ^ $temp[$i] = $dt0[$state[$i] >> 24 & 0x000000FF] ^
$dt1[$state[$j] & 0x00FF0000] ^ $dt1[$state[$j] >> 16 & 0x000000FF] ^
$dt2[$state[$k] & 0x0000FF00] ^ $dt2[$state[$k] >> 8 & 0x000000FF] ^
$dt3[$state[$l] & 0x000000FF] ^ $dt3[$state[$l] & 0x000000FF] ^
$dw[$round][$i]; $dw[$round][$i];
$i++; ++$i;
$j = ($j + 1) % $Nb; $j = ($j + 1) % $Nb;
$k = ($k + 1) % $Nb; $k = ($k + 1) % $Nb;
$l = ($l + 1) % $Nb; $l = ($l + 1) % $Nb;
} }
$state = $temp;
for ($i = 0; $i < $Nb; $i++) {
$state[$i] = $temp[$i];
}
} }
// invShiftRows + invSubWord + addRoundKey // invShiftRows + invSubWord + addRoundKey
@ -1114,17 +1121,31 @@ class Crypt_Rijndael {
($state[$j] & 0x00FF0000) | ($state[$j] & 0x00FF0000) |
($state[$k] & 0x0000FF00) | ($state[$k] & 0x0000FF00) |
($state[$l] & 0x000000FF)); ($state[$l] & 0x000000FF));
$i++; ++$i;
$j = ($j + 1) % $Nb; $j = ($j + 1) % $Nb;
$k = ($k + 1) % $Nb; $k = ($k + 1) % $Nb;
$l = ($l + 1) % $Nb; $l = ($l + 1) % $Nb;
} }
switch ($Nb) {
case 8:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6], $temp[7]);
case 7:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6]);
case 6:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5]);
case 5:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4]);
default:
return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3]);
}
/*
$state = $temp; $state = $temp;
array_unshift($state, 'N*'); array_unshift($state, 'N*');
return call_user_func_array('pack', $state); return call_user_func_array('pack', $state);
*/
} }
/** /**
@ -1224,10 +1245,10 @@ class Crypt_Rijndael {
$j = 0; $j = 0;
while ($j < $this->Nb) { while ($j < $this->Nb) {
$dw = $this->_subWord($this->w[$row][$j]); $dw = $this->_subWord($this->w[$row][$j]);
$temp[$j] = $this->dt0[$dw & 0xFF000000] ^ $temp[$j] = $this->dt0[$dw >> 24 & 0x000000FF] ^
$this->dt1[$dw & 0x00FF0000] ^ $this->dt1[$dw >> 16 & 0x000000FF] ^
$this->dt2[$dw & 0x0000FF00] ^ $this->dt2[$dw >> 8 & 0x000000FF] ^
$this->dt3[$dw & 0x000000FF]; $this->dt3[$dw & 0x000000FF];
$j++; $j++;
} }
$this->dw[$row] = $temp; $this->dw[$row] = $temp;
@ -1278,18 +1299,19 @@ class Crypt_Rijndael {
$sbox3 = array(); $sbox3 = array();
for ($i = 0; $i < 256; $i++) { for ($i = 0; $i < 256; $i++) {
$sbox1[$i << 8] = $sbox0[$i] << 8; $sbox1[] = $sbox0[$i] << 8;
$sbox2[$i << 16] = $sbox0[$i] << 16; $sbox2[] = $sbox0[$i] << 16;
$sbox3[$i << 24] = $sbox0[$i] << 24; $sbox3[] = $sbox0[$i] << 24;
} }
} }
return $sbox0[$word & 0x000000FF] | return $sbox0[$word & 0x000000FF] |
$sbox1[$word & 0x0000FF00] | $sbox1[$word >> 8 & 0x000000FF] |
$sbox2[$word & 0x00FF0000] | $sbox2[$word >> 16 & 0x000000FF] |
$sbox3[$word & 0xFF000000]; $sbox3[$word >> 24 & 0x000000FF];
} }
/** /**
* Performs inverse S-Box substitutions * Performs inverse S-Box substitutions
* *
@ -1324,16 +1346,16 @@ class Crypt_Rijndael {
$sbox3 = array(); $sbox3 = array();
for ($i = 0; $i < 256; $i++) { for ($i = 0; $i < 256; $i++) {
$sbox1[$i << 8] = $sbox0[$i] << 8; $sbox1[] = $sbox0[$i] << 8;
$sbox2[$i << 16] = $sbox0[$i] << 16; $sbox2[] = $sbox0[$i] << 16;
$sbox3[$i << 24] = $sbox0[$i] << 24; $sbox3[] = $sbox0[$i] << 24;
} }
} }
return $sbox0[$word & 0x000000FF] | return $sbox0[$word & 0x000000FF] |
$sbox1[$word & 0x0000FF00] | $sbox1[$word >> 8 & 0x000000FF] |
$sbox2[$word & 0x00FF0000] | $sbox2[$word >> 16 & 0x000000FF] |
$sbox3[$word & 0xFF000000]; $sbox3[$word >> 24 & 0x000000FF];
} }
/** /**