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Merge pull request #65 from petrich/patch-3
Rijndael: Performance update
This commit is contained in:
terrafrost
commit
7894fd98f5
@ -510,13 +510,13 @@ class Crypt_Rijndael {
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);
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for ($i = 0; $i < 256; $i++) {
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$t2[$i << 8] = (($t3[$i] << 8) & 0xFFFFFF00) | (($t3[$i] >> 24) & 0x000000FF);
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$t1[$i << 16] = (($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) & 0x0000FFFF);
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$t0[$i << 24] = (($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >> 8) & 0x00FFFFFF);
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$t2[] = (($t3[$i] << 8) & 0xFFFFFF00) | (($t3[$i] >> 24) & 0x000000FF);
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$t1[] = (($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) & 0x0000FFFF);
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$t0[] = (($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >> 8) & 0x00FFFFFF);
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$dt2[$i << 8] = (($this->dt3[$i] << 8) & 0xFFFFFF00) | (($dt3[$i] >> 24) & 0x000000FF);
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$dt1[$i << 16] = (($this->dt3[$i] << 16) & 0xFFFF0000) | (($dt3[$i] >> 16) & 0x0000FFFF);
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$dt0[$i << 24] = (($this->dt3[$i] << 24) & 0xFF000000) | (($dt3[$i] >> 8) & 0x00FFFFFF);
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$dt2[] = (($dt3[$i] << 8) & 0xFFFFFF00) | (($dt3[$i] >> 24) & 0x000000FF);
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$dt1[] = (($dt3[$i] << 16) & 0xFFFF0000) | (($dt3[$i] >> 16) & 0x0000FFFF);
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$dt0[] = (($dt3[$i] << 24) & 0xFF000000) | (($dt3[$i] >> 8) & 0x00FFFFFF);
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}
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}
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@ -719,7 +719,6 @@ class Crypt_Rijndael {
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$block_size = $this->block_size;
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$buffer = &$this->enbuffer;
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$continuousBuffer = $this->continuousBuffer;
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$ciphertext = '';
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switch ($this->mode) {
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case CRYPT_RIJNDAEL_MODE_ECB:
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@ -853,7 +852,6 @@ class Crypt_Rijndael {
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$block_size = $this->block_size;
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$buffer = &$this->debuffer;
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$continuousBuffer = $this->continuousBuffer;
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$plaintext = '';
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switch ($this->mode) {
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case CRYPT_RIJNDAEL_MODE_ECB:
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@ -985,9 +983,9 @@ class Crypt_Rijndael {
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$c = $this->c;
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// addRoundKey
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$i = 0;
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$i = -1;
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foreach ($words as $word) {
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$state[] = $word ^ $w[0][$i++];
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$state[] = $word ^ $w[0][++$i];
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}
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// fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components -
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@ -999,31 +997,28 @@ class Crypt_Rijndael {
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// [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf
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$temp = array();
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for ($round = 1; $round < $Nr; $round++) {
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for ($round = 1; $round < $Nr; ++$round) {
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$i = 0; // $c[0] == 0
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$j = $c[1];
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$k = $c[2];
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$l = $c[3];
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while ($i < $this->Nb) {
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$temp[$i] = $t0[$state[$i] & 0xFF000000] ^
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$t1[$state[$j] & 0x00FF0000] ^
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$t2[$state[$k] & 0x0000FF00] ^
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while ($i < $Nb) {
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$temp[$i] = $t0[$state[$i] >> 24 & 0x000000FF] ^
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$t1[$state[$j] >> 16 & 0x000000FF] ^
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$t2[$state[$k] >> 8 & 0x000000FF] ^
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$t3[$state[$l] & 0x000000FF] ^
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$w[$round][$i];
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$i++;
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++$i;
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$j = ($j + 1) % $Nb;
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$k = ($k + 1) % $Nb;
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$l = ($l + 1) % $Nb;
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}
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for ($i = 0; $i < $Nb; $i++) {
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$state[$i] = $temp[$i];
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}
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$state = $temp;
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}
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// subWord
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for ($i = 0; $i < $Nb; $i++) {
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for ($i = 0; $i < $Nb; ++$i) {
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$state[$i] = $this->_subWord($state[$i]);
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}
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@ -1032,22 +1027,38 @@ class Crypt_Rijndael {
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$j = $c[1];
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$k = $c[2];
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$l = $c[3];
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while ($i < $this->Nb) {
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while ($i < $Nb) {
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$temp[$i] = ($state[$i] & 0xFF000000) ^
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($state[$j] & 0x00FF0000) ^
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($state[$k] & 0x0000FF00) ^
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($state[$l] & 0x000000FF) ^
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$w[$Nr][$i];
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$i++;
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++$i;
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$j = ($j + 1) % $Nb;
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$k = ($k + 1) % $Nb;
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$l = ($l + 1) % $Nb;
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}
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// 100% ugly switch/case code... but ~5% faster (meaning: ~half second faster de/encrypting 1MB text, tested with php5.4.9 on linux/32bit with an AMD Athlon II P360 CPU) then the commented smart code below. Don't know it's worth or not
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switch ($Nb) {
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case 8:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6], $temp[7]);
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case 7:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6]);
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case 6:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5]);
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case 5:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4]);
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default:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3]);
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}
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/*
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$state = $temp;
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array_unshift($state, 'N*');
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return call_user_func_array('pack', $state);
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*/
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}
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/**
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@ -1062,7 +1073,6 @@ class Crypt_Rijndael {
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$state = array();
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$words = unpack('N*word', $in);
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$num_states = count($state);
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$dw = $this->dw;
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$dt0 = $this->dt0;
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$dt1 = $this->dt1;
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@ -1073,33 +1083,30 @@ class Crypt_Rijndael {
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$c = $this->c;
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// addRoundKey
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$i = 0;
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$i = -1;
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foreach ($words as $word) {
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$state[] = $word ^ $dw[$Nr][$i++];
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$state[] = $word ^ $dw[$Nr][++$i];
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}
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$temp = array();
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for ($round = $Nr - 1; $round > 0; $round--) {
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for ($round = $Nr - 1; $round > 0; --$round) {
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$i = 0; // $c[0] == 0
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$j = $Nb - $c[1];
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$k = $Nb - $c[2];
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$l = $Nb - $c[3];
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while ($i < $Nb) {
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$temp[$i] = $dt0[$state[$i] & 0xFF000000] ^
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$dt1[$state[$j] & 0x00FF0000] ^
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$dt2[$state[$k] & 0x0000FF00] ^
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$temp[$i] = $dt0[$state[$i] >> 24 & 0x000000FF] ^
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$dt1[$state[$j] >> 16 & 0x000000FF] ^
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$dt2[$state[$k] >> 8 & 0x000000FF] ^
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$dt3[$state[$l] & 0x000000FF] ^
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$dw[$round][$i];
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$i++;
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++$i;
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$j = ($j + 1) % $Nb;
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$k = ($k + 1) % $Nb;
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$l = ($l + 1) % $Nb;
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}
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for ($i = 0; $i < $Nb; $i++) {
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$state[$i] = $temp[$i];
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}
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$state = $temp;
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}
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// invShiftRows + invSubWord + addRoundKey
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@ -1114,17 +1121,31 @@ class Crypt_Rijndael {
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($state[$j] & 0x00FF0000) |
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($state[$k] & 0x0000FF00) |
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($state[$l] & 0x000000FF));
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$i++;
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++$i;
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$j = ($j + 1) % $Nb;
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$k = ($k + 1) % $Nb;
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$l = ($l + 1) % $Nb;
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}
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switch ($Nb) {
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case 8:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6], $temp[7]);
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case 7:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6]);
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case 6:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5]);
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case 5:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4]);
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default:
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return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3]);
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}
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/*
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$state = $temp;
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array_unshift($state, 'N*');
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return call_user_func_array('pack', $state);
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*/
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}
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/**
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@ -1224,9 +1245,9 @@ class Crypt_Rijndael {
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$j = 0;
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while ($j < $this->Nb) {
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$dw = $this->_subWord($this->w[$row][$j]);
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$temp[$j] = $this->dt0[$dw & 0xFF000000] ^
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$this->dt1[$dw & 0x00FF0000] ^
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$this->dt2[$dw & 0x0000FF00] ^
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$temp[$j] = $this->dt0[$dw >> 24 & 0x000000FF] ^
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$this->dt1[$dw >> 16 & 0x000000FF] ^
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$this->dt2[$dw >> 8 & 0x000000FF] ^
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$this->dt3[$dw & 0x000000FF];
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$j++;
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}
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@ -1278,18 +1299,19 @@ class Crypt_Rijndael {
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$sbox3 = array();
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for ($i = 0; $i < 256; $i++) {
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$sbox1[$i << 8] = $sbox0[$i] << 8;
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$sbox2[$i << 16] = $sbox0[$i] << 16;
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$sbox3[$i << 24] = $sbox0[$i] << 24;
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$sbox1[] = $sbox0[$i] << 8;
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$sbox2[] = $sbox0[$i] << 16;
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$sbox3[] = $sbox0[$i] << 24;
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}
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}
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return $sbox0[$word & 0x000000FF] |
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$sbox1[$word & 0x0000FF00] |
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$sbox2[$word & 0x00FF0000] |
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$sbox3[$word & 0xFF000000];
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$sbox1[$word >> 8 & 0x000000FF] |
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$sbox2[$word >> 16 & 0x000000FF] |
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$sbox3[$word >> 24 & 0x000000FF];
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}
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/**
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* Performs inverse S-Box substitutions
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*
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@ -1324,16 +1346,16 @@ class Crypt_Rijndael {
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$sbox3 = array();
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for ($i = 0; $i < 256; $i++) {
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$sbox1[$i << 8] = $sbox0[$i] << 8;
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$sbox2[$i << 16] = $sbox0[$i] << 16;
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$sbox3[$i << 24] = $sbox0[$i] << 24;
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$sbox1[] = $sbox0[$i] << 8;
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$sbox2[] = $sbox0[$i] << 16;
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$sbox3[] = $sbox0[$i] << 24;
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}
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}
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return $sbox0[$word & 0x000000FF] |
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$sbox1[$word & 0x0000FF00] |
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$sbox2[$word & 0x00FF0000] |
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$sbox3[$word & 0xFF000000];
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$sbox1[$word >> 8 & 0x000000FF] |
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$sbox2[$word >> 16 & 0x000000FF] |
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$sbox3[$word >> 24 & 0x000000FF];
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}
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/**
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