phphextostring

『壹』 怎樣在php中把16進制HEX數據轉換為2進制數據呢

十六進制轉為二進制有兩種理解方法，第一是十六進制字元串轉二進制字元串，第二是十六進制數轉二進制數，下面分別介紹2種轉換方法：

1.hex2bin函數可以將十六進制字元串轉換為二進制字元串，詳細用法如下：

hex2bin — 轉換十六進制字元串為二進制字元串

stringhex2bin(string$data)

轉換十六進制字元串為二進制字元串。

參數：

data：十六進製表示的數據

返回值：

返回給定數據的二進製表示 或者在失敗時返回 FALSE。

異常：

如果輸入的十六進制字元串是奇數長數或者無效的十六進制字元串將會拋出E_WARNING 級別的錯誤。

示例：

$hex=hex2bin("");
echo$hex;//examplehexdata(其中16進制代表的是ascii碼)

2.base_convert是真正意義上的進制轉換函數

base_convert — 在任意進制之間轉換數字

stringbase_convert(string$number,int$frombase,int$tobase)

返回一字元串，包含 number以 tobase 進制的表示。number 本身的進制由frombase指定。frombase 和 tobase 都只能在2 和 36 之間（包括 2 和 36）。高於十進制的數字用字母 a-z 表示，例如a 表示 10，b 表示 11 以及 z 表示 35。

參數：

number：要轉換的數字

frombase：原始進制

tobase：轉換後的進制

示例：

$hexadecimal='A37334';
echobase_convert($hexadecimal,16,2);//101000110111001100110100

『貳』 php編程：將26位字母進制轉換為10進制數字，如何做

主要是加權法。
10進制結果=∑各位上的值*（進制數^各位權值）
a^b表示a的b次方。
比如你說的26進制
a->1
s->19
d->4
那麼asd=1*(26^2)+19*(26^1)+4*(26^0)=1174（10進制）
如果是8進制數456=4*(8^2)+5*(8^2)+6*(8^0)=302（10進制）

分太少，不寫源程序了，建立索引數組$arr[a]=1$,arr[b]=2..
再把輸入的字母拆成單字元倒序數組使得$single[2]=a，$single[1]=s，$single[0]=d，按上面方法權值相加。
你懂的。

『叄』 toHexString

修改了一處
msg += "\\u" +Integer.toHexString((int)chars[i]);後面加入了" "
msg += "\\u" + Integer.toHexString((int) chars[i]) + " ";目的是為了方便字元串的劃分(用\\u劃分字元串貌似不行)如果對這部有異議,可以選擇其它劃分字元串的方法.

添加了一個方法hexToString,用來將規定格式的句子還原為最初的字元串..按樓主題目的要求就是為了將十六進制數還原為"中華人民共和國"

public class strings {
static String msg = "";

public static void main(String[] args) {
msg = tohex();
System.err.println(msg);
String result = hextoString(msg);
System.err.println(result);
}

public static String tohex() {
String test = "中華人民共和國";
char[] chars = test.toCharArray();
for (int i = 0; i < chars.length; i++) {
// 為了方便字元串劃分,在每個十六進制數結尾加上了空格
msg += "\\u" + Integer.toHexString((int) chars[i]) + " ";
}
return msg;
}

public static String hextoString(String msg) {
//空枝 下面三句是利用正則表達式,用空格作為分隔符
// 獲得每個斗粗敏"\\u"+十六進制數子串,並保存與strs數凳滲組
Pattern pattern;
pattern = Pattern.compile(" ");
String[] strs = pattern.split(msg);

char[] foreString = new char[strs.length];
String hexNum;
for (int i = 0; i < strs.length; i++) {
hexNum = strs[i].substring(2);// 獲得"\\u"後面的十六進制數
int value = Integer.parseInt(hexNum, 16);// 將其轉化為十進制數
foreString[i] = (char) value;
}
return new String(foreString);
}
}

『肆』 80分求DES加密解密演算法實現的PHP源代碼

以下演算法根據js演算法移植：

<?php

function des ($key, $message, $encrypt, $mode, $iv, $padding) {
$message0 = $message;
//declaring this locally speeds things up a bit
$spfunction1 = array (0x1010400,0,0x10000,0x1010404,0x1010004,0x10404,0x4,0x10000,0x400,0x1010400,0x1010404,0x400,0x1000404,0x1010004,0x1000000,0x4,0x404,0x1000400,0x1000400,0x10400,0x10400,0x1010000,0x1010000,0x1000404,0x10004,0x1000004,0x1000004,0x10004,0,0x404,0x10404,0x1000000,0x10000,0x1010404,0x4,0x1010000,0x1010400,0x1000000,0x1000000,0x400,0x1010004,0x10000,0x10400,0x1000004,0x400,0x4,0x1000404,0x10404,0x1010404,0x10004,0x1010000,0x1000404,0x1000004,0x404,0x10404,0x1010400,0x404,0x1000400,0x1000400,0,0x10004,0x10400,0,0x1010004);
$spfunction2 = array (-0x7fef7fe0,-0x7fff8000,0x8000,0x108020,0x100000,0x20,-0x7fefffe0,-0x7fff7fe0,-0x7fffffe0,-0x7fef7fe0,-0x7fef8000,-0x80000000,-0x7fff8000,0x100000,0x20,-0x7fefffe0,0x108000,0x100020,-0x7fff7fe0,0,-0x80000000,0x8000,0x108020,-0x7ff00000,0x100020,-0x7fffffe0,0,0x108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0x108020,-0x7fefffe0,0x100000,-0x7fff7fe0,-0x7ff00000,-0x7fef8000,0x8000,-0x7ff00000,-0x7fff8000,0x20,-0x7fef7fe0,0x108020,0x20,0x8000,-0x80000000,0x8020,-0x7fef8000,0x100000,-0x7fffffe0,0x100020,-0x7fff7fe0,-0x7fffffe0,0x100020,0x108000,0,-0x7fff8000,0x8020,-0x80000000,-0x7fefffe0,-0x7fef7fe0,0x108000);
$spfunction3 = array (0x208,0x8020200,0,0x8020008,0x8000200,0,0x20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0x200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200);
$spfunction4 = array (0x802001,0x2081,0x2081,0x80,0x802080,0x800081,0x800001,0x2001,0,0x802000,0x802000,0x802081,0x81,0,0x800080,0x800001,0x1,0x2000,0x800000,0x802001,0x80,0x800000,0x2001,0x2080,0x800081,0x1,0x2080,0x800080,0x2000,0x802080,0x802081,0x81,0x800080,0x800001,0x802000,0x802081,0x81,0,0,0x802000,0x2080,0x800080,0x800081,0x1,0x802001,0x2081,0x2081,0x80,0x802081,0x81,0x1,0x2000,0x800001,0x2001,0x802080,0x800081,0x2001,0x2080,0x800000,0x802001,0x80,0x800000,0x2000,0x802080);
$spfunction5 = array (0x100,0x2080100,0x2080000,0x42000100,0x80000,0x100,0x40000000,0x2080000,0x40080100,0x80000,0x2000100,0x40080100,0x42000100,0x42080000,0x80100,0x40000000,0x2000000,0x40080000,0x40080000,0,0x40000100,0x42080100,0x42080100,0x2000100,0x42080000,0x40000100,0,0x42000000,0x2080100,0x2000000,0x42000000,0x80100,0x80000,0x42000100,0x100,0x2000000,0x40000000,0x2080000,0x42000100,0x40080100,0x2000100,0x40000000,0x42080000,0x2080100,0x40080100,0x100,0x2000000,0x42080000,0x42080100,0x80100,0x42000000,0x42080100,0x2080000,0,0x40080000,0x42000000,0x80100,0x2000100,0x40000100,0x80000,0,0x40080000,0x2080100,0x40000100);
$spfunction6 = array (0x20000010,0x20400000,0x4000,0x20404010,0x20400000,0x10,0x20404010,0x400000,0x20004000,0x404010,0x400000,0x20000010,0x400010,0x20004000,0x20000000,0x4010,0,0x400010,0x20004010,0x4000,0x404000,0x20004010,0x10,0x20400010,0x20400010,0,0x404010,0x20404000,0x4010,0x404000,0x20404000,0x20000000,0x20004000,0x10,0x20400010,0x404000,0x20404010,0x400000,0x4010,0x20000010,0x400000,0x20004000,0x20000000,0x4010,0x20000010,0x20404010,0x404000,0x20400000,0x404010,0x20404000,0,0x20400010,0x10,0x4000,0x20400000,0x404010,0x4000,0x400010,0x20004010,0,0x20404000,0x20000000,0x400010,0x20004010);
$spfunction7 = array (0x200000,0x4200002,0x4000802,0,0x800,0x4000802,0x200802,0x4200800,0x4200802,0x200000,0,0x4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x200802,0x200002,0x4000800,0x4000002,0x4200000,0x4200800,0x200002,0x4200000,0x800,0x802,0x4200802,0x200800,0x2,0x4000000,0x200800,0x4000000,0x200800,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x4200800,0x802,0x200802,0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002);
$spfunction8 = array (0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000);
$masks = array (4294967295,2147483647,1073741823,536870911,268435455,134217727,67108863,33554431,16777215,8388607,4194303,2097151,1048575,524287,262143,131071,65535,32767,16383,8191,4095,2047,1023,511,255,127,63,31,15,7,3,1,0);

//create the 16 or 48 subkeys we will need
$keys = des_createKeys ($key);
$m=0;
$len = strlen($message);
//如果加密，則需要填充
if($encrypt==1){
if($len%8==1){
for($i=0;$i<7;$i++)
$message.=chr(7);
}
if($len%8==2){
for($i=0;$i<6;$i++)
$message.=chr(6);
}
if($len%8==3){
for($i=0;$i<5;$i++)
$message.=chr(5);
}

if($len%8==4){
for($i=0;$i<4;$i++)
$message.=chr(4);
}
if($len%8==5){
for($i=0;$i<3;$i++)
$message.=chr(3);
}
if($len%8==6){
for($i=0;$i<2;$i++)
$message.=chr(2);
}
if($len%8==7){
for($i=0;$i<1;$i++)
$message.=chr(1);
}
if($len%8==0){
for($i=0;$i<8;$i++)
$message.=chr(8);
$len = $len + 8;
}
}
echo "message:".$message;
echo "<br>";
$chunk = 0;
//set up the loops for single and triple des
$iterations = ((count($keys) == 32) ? 3 : 9); //single or triple des
if ($iterations == 3) {$looping = (($encrypt) ? array (0, 32, 2) : array (30, -2, -2));}
else {$looping = (($encrypt) ? array (0, 32, 2, 62, 30, -2, 64, 96, 2) : array (94, 62, -2, 32, 64, 2, 30, -2, -2));}

echo "3.iterations".$iterations;
echo "<br> 4.looping:";
for($ii = 0; $ii < count($looping); $ii++){
echo ",".$looping[$ii];
}
echo "<br>";

//pad the message depending on the padding parameter
// if ($padding == 2) $message .= " "; //pad the message with spaces
// else if ($padding == 1) {$temp = chr (8-($len%8)); $message .= $temp . $temp . $temp . $temp . $temp . $temp . $temp . $temp; if ($temp==8) $len+=8;} //PKCS7 padding
// else if (!$padding) $message .= (chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0)); //pad the message out with null bytes

//store the result here
$result = "";
$tempresult = "";

if ($mode == 1) { //CBC mode
$cbcleft = (ord($iv{$m++}) << 24) | (ord($iv{$m++}) << 16) | (ord($iv{$m++}) << 8) | ord($iv{$m++});
$cbcright = (ord($iv{$m++}) << 24) | (ord($iv{$m++}) << 16) | (ord($iv{$m++}) << 8) | ord($iv{$m++});
$m=0;
}

echo "mode:".$mode;
echo "<br>";
echo "5.cbcleft:".$cbcleft;
echo "<br>";
echo "6.cbcright:".$cbcright;
echo "<br>";

//loop through each 64 bit chunk of the message
while ($m < $len) {
$left = (ord($message{$m++}) << 24) | (ord($message{$m++}) << 16) | (ord($message{$m++}) << 8) | ord($message{$m++});
$right = (ord($message{$m++}) << 24) | (ord($message{$m++}) << 16) | (ord($message{$m++}) << 8) | ord($message{$m++});

//for Cipher Block Chaining mode, xor the message with the previous result
if ($mode == 1) {if ($encrypt) {$left ^= $cbcleft; $right ^= $cbcright;} else {$cbcleft2 = $cbcleft; $cbcright2 = $cbcright; $cbcleft = $left; $cbcright = $right;}}

//first each 64 but chunk of the message must be permuted according to IP
$temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4);
$temp = (($left >> 16 & $masks[16]) ^ $right) & 0x0000ffff; $right ^= $temp; $left ^= ($temp << 16);
$temp = (($right >> 2 & $masks[2]) ^ $left) & 0x33333333; $left ^= $temp; $right ^= ($temp << 2);
$temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8);
$temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1);

$left = (($left << 1) | ($left >> 31 & $masks[31]));
$right = (($right << 1) | ($right >> 31 & $masks[31]));

//do this either 1 or 3 times for each chunk of the message
for ($j=0; $j<$iterations; $j+=3) {
$endloop = $looping[$j+1];
$loopinc = $looping[$j+2];
//now go through and perform the encryption or decryption
for ($i=$looping[$j]; $i!=$endloop; $i+=$loopinc) { //for efficiency
$right1 = $right ^ $keys[$i];
$right2 = (($right >> 4 & $masks[4]) | ($right << 28 & 0xffffffff)) ^ $keys[$i+1];
//the result is attained by passing these bytes through the S selection functions
$temp = $left;
$left = $right;
$right = $temp ^ ($spfunction2[($right1 >> 24 & $masks[24]) & 0x3f] | $spfunction4[($right1 >> 16 & $masks[16]) & 0x3f]
| $spfunction6[($right1 >> 8 & $masks[8]) & 0x3f] | $spfunction8[$right1 & 0x3f]
| $spfunction1[($right2 >> 24 & $masks[24]) & 0x3f] | $spfunction3[($right2 >> 16 & $masks[16]) & 0x3f]
| $spfunction5[($right2 >> 8 & $masks[8]) & 0x3f] | $spfunction7[$right2 & 0x3f]);
}
$temp = $left; $left = $right; $right = $temp; //unreverse left and right
} //for either 1 or 3 iterations

//move then each one bit to the right
$left = (($left >> 1 & $masks[1]) | ($left << 31));
$right = (($right >> 1 & $masks[1]) | ($right << 31));

//now perform IP-1, which is IP in the opposite direction
$temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1);
$temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8);
$temp = (($right >> 2 & $masks[2]) ^ $left) & 0x33333333; $left ^= $temp; $right ^= ($temp << 2);
$temp = (($left >> 16 & $masks[16]) ^ $right) & 0x0000ffff; $right ^= $temp; $left ^= ($temp << 16);
$temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4);

//for Cipher Block Chaining mode, xor the message with the previous result
if ($mode == 1) {if ($encrypt) {$cbcleft = $left; $cbcright = $right;} else {$left ^= $cbcleft2; $right ^= $cbcright2;}}
$tempresult .= (chr($left>>24 & $masks[24]) . chr(($left>>16 & $masks[16]) & 0xff) . chr(($left>>8 & $masks[8]) & 0xff) . chr($left & 0xff) . chr($right>>24 & $masks[24]) . chr(($right>>16 & $masks[16]) & 0xff) . chr(($right>>8 & $masks[8]) & 0xff) . chr($right & 0xff));

$chunk += 8;
if ($chunk == 512) {$result .= $tempresult; $tempresult = ""; $chunk = 0;}
} //for every 8 characters, or 64 bits in the message

//return the result as an array
return ($result . $tempresult);
} //end of des

//des_createKeys
//this takes as input a 64 bit key (even though only 56 bits are used)
//as an array of 2 integers, and returns 16 48 bit keys
function des_createKeys ($key) {
//declaring this locally speeds things up a bit
$pc2bytes0 = array (0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
$pc2bytes1 = array (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101);
$pc2bytes2 = array (0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808);
$pc2bytes3 = array (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000);
$pc2bytes4 = array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
$pc2bytes5 = array (0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420);
$pc2bytes6 = array (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002);
$pc2bytes7 = array (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800);
$pc2bytes8 = array (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002);
$pc2bytes9 = array (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408);
$pc2bytes10 = array (0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020);
$pc2bytes11 = array (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200);
$pc2bytes12 = array (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010);
$pc2bytes13 = array (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);
$masks = array (4294967295,2147483647,1073741823,536870911,268435455,134217727,67108863,33554431,16777215,8388607,4194303,2097151,1048575,524287,262143,131071,65535,32767,16383,8191,4095,2047,1023,511,255,127,63,31,15,7,3,1,0);

//how many iterations (1 for des, 3 for triple des)
// $iterations = ((strlen($key) > 8) ? 3 : 1); //changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys
$iterations = ((strlen($key) > 24) ? 3 : 1); //changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys
//stores the return keys
$keys = array (); // size = 32 * iterations but you don't specify this in php
//now define the left shifts which need to be done
$shifts = array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);
//other variables
$m=0;
$n=0;

for ($j=0; $j<$iterations; $j++) { //either 1 or 3 iterations
$left = (ord($key{$m++}) << 24) | (ord($key{$m++}) << 16) | (ord($key{$m++}) << 8) | ord($key{$m++});
$right = (ord($key{$m++}) << 24) | (ord($key{$m++}) << 16) | (ord($key{$m++}) << 8) | ord($key{$m++});

$temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f; $right ^= $temp; $left ^= ($temp << 4);
$temp = (($right >> 16 & $masks[16]) ^ $left) & 0x0000ffff; $left ^= $temp; $right ^= ($temp << 16);
$temp = (($left >> 2 & $masks[2]) ^ $right) & 0x33333333; $right ^= $temp; $left ^= ($temp << 2);
$temp = (($right >> 16 & $masks[16]) ^ $left) & 0x0000ffff; $left ^= $temp; $right ^= ($temp << 16);
$temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1);
$temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff; $left ^= $temp; $right ^= ($temp << 8);
$temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555; $right ^= $temp; $left ^= ($temp << 1);

//the right side needs to be shifted and to get the last four bits of the left side
$temp = ($left << 8) | (($right >> 20 & $masks[20]) & 0x000000f0);
//left needs to be put upside down
$left = ($right << 24) | (($right << 8) & 0xff0000) | (($right >> 8 & $masks[8]) & 0xff00) | (($right >> 24 & $masks[24]) & 0xf0);
$right = $temp;

//now go through and perform these shifts on the left and right keys
for ($i=0; $i < count($shifts); $i++) {
//shift the keys either one or two bits to the left
if ($shifts[$i] > 0) {
$left = (($left << 2) | ($left >> 26 & $masks[26]));
$right = (($right << 2) | ($right >> 26 & $masks[26]));
} else {
$left = (($left << 1) | ($left >> 27 & $masks[27]));
$right = (($right << 1) | ($right >> 27 & $masks[27]));
}
$left = $left & -0xf;
$right = $right & -0xf;

//now apply PC-2, in such a way that E is easier when encrypting or decrypting
//this conversion will look like PC-2 except only the last 6 bits of each byte are used
//rather than 48 consecutive bits and the order of lines will be according to
//how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7
$lefttemp = $pc2bytes0[$left >> 28 & $masks[28]] | $pc2bytes1[($left >> 24 & $masks[24]) & 0xf]
| $pc2bytes2[($left >> 20 & $masks[20]) & 0xf] | $pc2bytes3[($left >> 16 & $masks[16]) & 0xf]
| $pc2bytes4[($left >> 12 & $masks[12]) & 0xf] | $pc2bytes5[($left >> 8 & $masks[8]) & 0xf]
| $pc2bytes6[($left >> 4 & $masks[4]) & 0xf];
$righttemp = $pc2bytes7[$right >> 28 & $masks[28]] | $pc2bytes8[($right >> 24 & $masks[24]) & 0xf]
| $pc2bytes9[($right >> 20 & $masks[20]) & 0xf] | $pc2bytes10[($right >> 16 & $masks[16]) & 0xf]
| $pc2bytes11[($right >> 12 & $masks[12]) & 0xf] | $pc2bytes12[($right >> 8 & $masks[8]) & 0xf]
| $pc2bytes13[($right >> 4 & $masks[4]) & 0xf];
$temp = (($righttemp >> 16 & $masks[16]) ^ $lefttemp) & 0x0000ffff;
$keys[$n++] = $lefttemp ^ $temp; $keys[$n++] = $righttemp ^ ($temp << 16);
}
} //for each iterations
//return the keys we've created
for($ii = 0; $ii < count($keys); $ii++){
echo ",".$keys[$ii];
}
echo "<br>";
return $keys;
} //end of des_createKeys

////////////////////////////// TEST //////////////////////////////
function stringToHex ($s) {
$r = "0x";
$hexes = array ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
for ($i=0; $i<strlen($s); $i++) {$r .= ($hexes [(ord($s{$i}) >> 4)] . $hexes [(ord($s{$i}) & 0xf)]);}
return $r;
}

function hexToString ($h) {
$r = "";
for ($i= (substr($h, 0, 2)=="0x")?2:0; $i<strlen($h); $i+=2) {$r .= chr (base_convert (substr ($h, $i, 2), 16, 10));}
return $r;
}

function idtag_des_encode($text)
{

$key = '12345678';
$y=pkcs5_pad($text);

echo "y:".$y;
echo "<br />";

$td = mcrypt_mole_open(MCRYPT_DES,'',MCRYPT_MODE_CBC,''); //使用MCRYPT_DES演算法,cbc模式
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
$ks = mcrypt_enc_get_key_size($td);
mcrypt_generic_init($td, $key, $key); //初始處理

$encrypted = mcrypt_generic($td, $y); //解密

mcrypt_generic_deinit($td); //結束
mcrypt_mole_close($td);

return $encrypted;
// return base64_encode($encrypted);
}

function pkcs5_pad($text,$block=8)
{
$pad = $block - (strlen($text) % $block);
return $text . str_repeat(chr($pad), $pad);
}

$key = "12345678";
$message = "str4";
$ciphertext = des ($key, $message, 1, 1, $key,null);

//echo "stringToHex (ciphertext): " . stringToHex ($ciphertext);
//echo "<br />";
echo "base64_encode(ciphertext): " . base64_encode($ciphertext);
//echo "<br />";
//echo "encode64(ciphertext): " . encode64($ciphertext);
//echo "<br />";
//echo "base64_encode(stringToHex (ciphertext)): " . base64_encode(stringToHex ($ciphertext));
//echo "<br />";
//echo "stringToHex (base64_encode(ciphertext)): " . stringToHex (idtag_des_encode($message));
echo "<br />";
echo "idtag_des_encode: " .base64_encode(idtag_des_encode($message));
//$recovered_message = des ($key, $ciphertext, 0, 0, null,null);
//echo "\n";
//echo "DES Test Decrypted: " . $recovered_message;

?>

『伍』 php中字元串轉化為整形的函數是

字元串轉換為數值
當一個字元串被當作數字來求值時，根據以下規則來決定結果的類型和值。

如果包括「.」，「e」或「E」其中任何一個字元的話，字元串被當作 float 來求值。否則就被當作整數。

該值由字元串最前面的部分決定。如果字元串以合法的數字數據開始，就用該數字作為其值，否則其值為 0（零）。合法數字數據由可選的正負號開始，後面跟著一個或多個數字（可選地包括十進制分數），後面跟著可選的指數。指數是一個「e」或者「E」後面跟著一個或多個數字。

<?php
$foo = 1 + "10.5"; // $foo is float (11.5)
$foo = 1 + "-1.3e3"; // $foo is float (-1299)
$foo = 1 + "bob-1.3e3"; // $foo is integer (1)
$foo = 1 + "bob3"; // $foo is integer (1)
$foo = 1 + "10 Small Pigs"; // $foo is integer (11)
$foo = 4 + "10.2 Little Piggies"; // $foo is float (14.2)
$foo = "10.0 pigs " + 1; // $foo is float (11)
$foo = "10.0 pigs " + 1.0; // $foo is float (11)
?>
此轉換的更多信息見 Unix 手冊中關於 strtod(3) 的部分。

『陸』 PHP 浮點進制轉換

下面是php實現的方法：
/**
*十六進制浮點型轉為十進制
*@paramString$strHex十六進制浮點數
*/
functionhexToDecFloat($strHex){
$v=hexdec($strHex);
$x=($v&((1<<23)-1))+(1<<23)*($v>>31|1);
$exp=($v>>23&0xFF)-127;
return$x*pow(2,$exp-23);
}

你說得很高深的樣子，又不舉例，不知道你究竟需要把什麼樣子的數轉換成什麼，上面是例子看看是不是你要的吧，如果不是，請一定舉例。

『柒』 已知小寫英文字母m的ASCII碼值是十六進制數6D，則字母q的十六進制ASCII碼值是什麼，給過程哦

再用十六進製表示是63，(應該寫成'c')，操作方法如下：

1、首先實現下面的函數，將單個字元轉換為十六進製表示。

『捌』 PHP一組十六進制數據如何轉成字元串

字元類型是整型類型的一種，將其轉換成int類型，然後再輸出十六進制形式即可。下面是一個示常式序。

#include <iostream>using namespace std;int main(){ char str_test[] = "hello world\n";int limit = strlen(str_test);for (int inx=0; inx!=limit; ++inx) //用static_cast將字元類型轉成int類型cout<<str_test[inx]<<"---hex:"<<hex<<static_cast<int>(str_test[inx])<<"\t";cout<<endl;return 0;}

程序執行結果：

『玖』 PHP里，16進制格式字元串，轉換成具體值的方法

還有 hexdec 這個函數number hexdec ( string $hex_string )

Example #1 hexdec() 例子

<?php
var_mp(hexdec("See"));
var_mp(hexdec("ee"));
// both print "int(238)"

var_mp(hexdec("that")); // print "int(10)"
var_mp(hexdec("a0")); // print "int(160)"
?>

『拾』 php魔術方法__tostring

__tostring()方法：在直接輸出對象引用的時候，就不會產生錯誤，而是自動調用了__tostring()方法,輸出__tostring()方法中返回的字元串

通俗來說就是 對象一般是使用print_r() 或 var_mp() 來列印訪問

但對於一般閑的人來說直接 使用 echo 輸出對象時，必定會報錯的，原因是對象無法使用echo的。

這個時候如果想解決這個錯誤，咱們應該怎麼操作呢？

可以很好的利用__tostring()這個魔術方法

但是切記使用__toString() 時返回值一定要使用return 來進行返回。

<?php
header("content-type:text/html;charset=utf-8");
class demo{
public $foo;
public function __construct($foo){
$this->foo=$foo;
}
//定義一個__toString（）方法時，返加一個成員屬性$foo
public function __toString(){
return $this->foo;
}
}
$demo=new demo('hello PHP成員');
echo $demo;