本文整理汇总了PHP中Math_BigInteger::setPrecision方法的典型用法代码示例。如果您正苦于以下问题：PHP Math_BigInteger::setPrecision方法的具体用法？PHP Math_BigInteger::setPrecision怎么用？PHP Math_BigInteger::setPrecision使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Math_BigInteger的用法示例。
在下文中一共展示了Math_BigInteger::setPrecision方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的PHP代码示例。
示例1: array
/**
* Pure-PHP implementation of SHA384 and SHA512
*
* @access private
* @param String $text
*/
function _sha512($m)
{
if (!class_exists('Math_BigInteger')) {
require_once 'Math/BigInteger.php';
}
static $init384, $init512, $k;
if (!isset($k)) {
// Initialize variables
$init384 = array('cbbb9d5dc1059ed8', '629a292a367cd507', '9159015a3070dd17', '152fecd8f70e5939', '67332667ffc00b31', '8eb44a8768581511', 'db0c2e0d64f98fa7', '47b5481dbefa4fa4');
$init512 = array('6a09e667f3bcc908', 'bb67ae8584caa73b', '3c6ef372fe94f82b', 'a54ff53a5f1d36f1', '510e527fade682d1', '9b05688c2b3e6c1f', '1f83d9abfb41bd6b', '5be0cd19137e2179');
for ($i = 0; $i < 8; $i++) {
$init384[$i] = new Math_BigInteger($init384[$i], 16);
$init384[$i]->setPrecision(64);
$init512[$i] = new Math_BigInteger($init512[$i], 16);
$init512[$i]->setPrecision(64);
}
// Initialize table of round constants
// (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
$k = array('428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc', '3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118', 'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2', '72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694', 'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65', '2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5', '983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4', 'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70', '27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df', '650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b', 'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30', 'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8', '19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8', '391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3', '748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec', '90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b', 'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178', '06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b', '28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c', '4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817');
for ($i = 0; $i < 80; $i++) {
$k[$i] = new Math_BigInteger($k[$i], 16);
}
}
$hash = $this->l == 48 ? $init384 : $init512;
// Pre-processing
$length = strlen($m);
// to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
$m .= str_repeat(chr(0), 128 - ($length + 16 & 0x7f));
$m[$length] = chr(0x80);
// we don't support hashing strings 512MB long
$m .= pack('N4', 0, 0, 0, $length << 3);
// Process the message in successive 1024-bit chunks
$chunks = str_split($m, 128);
foreach ($chunks as $chunk) {
$w = array();
for ($i = 0; $i < 16; $i++) {
$temp = new Math_BigInteger($this->_string_shift($chunk, 8), 256);
$temp->setPrecision(64);
$w[] = $temp;
}
// Extend the sixteen 32-bit words into eighty 32-bit words
for ($i = 16; $i < 80; $i++) {
$temp = array($w[$i - 15]->bitwise_rightRotate(1), $w[$i - 15]->bitwise_rightRotate(8), $w[$i - 15]->bitwise_rightShift(7));
$s0 = $temp[0]->bitwise_xor($temp[1]);
$s0 = $s0->bitwise_xor($temp[2]);
$temp = array($w[$i - 2]->bitwise_rightRotate(19), $w[$i - 2]->bitwise_rightRotate(61), $w[$i - 2]->bitwise_rightShift(6));
$s1 = $temp[0]->bitwise_xor($temp[1]);
$s1 = $s1->bitwise_xor($temp[2]);
$w[$i] = $w[$i - 16]->copy();
$w[$i] = $w[$i]->add($s0);
$w[$i] = $w[$i]->add($w[$i - 7]);
$w[$i] = $w[$i]->add($s1);
}
// Initialize hash value for this chunk
$a = $hash[0]->copy();
$b = $hash[1]->copy();
$c = $hash[2]->copy();
$d = $hash[3]->copy();
$e = $hash[4]->copy();
$f = $hash[5]->copy();
$g = $hash[6]->copy();
$h = $hash[7]->copy();
// Main loop
for ($i = 0; $i < 80; $i++) {
$temp = array($a->bitwise_rightRotate(28), $a->bitwise_rightRotate(34), $a->bitwise_rightRotate(39));
$s0 = $temp[0]->bitwise_xor($temp[1]);
$s0 = $s0->bitwise_xor($temp[2]);
$temp = array($a->bitwise_and($b), $a->bitwise_and($c), $b->bitwise_and($c));
$maj = $temp[0]->bitwise_xor($temp[1]);
$maj = $maj->bitwise_xor($temp[2]);
$t2 = $s0->add($maj);
$temp = array($e->bitwise_rightRotate(14), $e->bitwise_rightRotate(18), $e->bitwise_rightRotate(41));
$s1 = $temp[0]->bitwise_xor($temp[1]);
$s1 = $s1->bitwise_xor($temp[2]);
$temp = array($e->bitwise_and($f), $g->bitwise_and($e->bitwise_not()));
$ch = $temp[0]->bitwise_xor($temp[1]);
$t1 = $h->add($s1);
$t1 = $t1->add($ch);
$t1 = $t1->add($k[$i]);
$t1 = $t1->add($w[$i]);
$h = $g->copy();
$g = $f->copy();
$f = $e->copy();
$e = $d->add($t1);
$d = $c->copy();
$c = $b->copy();
$b = $a->copy();
$a = $t1->add($t2);
}
// Add this chunk's hash to result so far
$hash = array($hash[0]->add($a), $hash[1]->add($b), $hash[2]->add($c), $hash[3]->add($d), $hash[4]->add($e), $hash[5]->add($f), $hash[6]->add($g), $hash[7]->add($h));
}
// Produce the final hash value (big-endian)
// (Crypt_Hash::hash() trims the output for hashes but not for HMACs. as such, we trim the output here)
//.........这里部分代码省略.........