数藏源码：解密编程的奥秘

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编程的奥秘 金旭亮 电子工业出版社 9787121018206
base64 可加可解。 md5 不可解
2种PHP的源码加密方式，此加密方法支持任意PHP版。
注意，加密后的PHP代码无需第三方工具解密，像往常一样兆逗纳，直接运行即可。
复制代码 代码如下:
<?php
function encode_get='_blank'>coin/130.html' target='_blank'>file_contents($filename) {$type=strtolower(substr(strrchr($filename,'.'),1));if ('php' == $type && is_file($filename) && is_writable($filename)) { // 如果是PHP文件 并且可写 则进行压缩编码$contents = file_get_contents($filename); // 判断文件是否已经被编码处理$contents = php_strip_whitespace($filename);// 去除PHP头部和尾部标识
$headerPos = strpos($contents,'<?php');
$footerPos = strrpos($contents,'?>');
$contents = substr($contents, $headerPos + 5, $footerPos - $headerPos);$encode = base64_encode(gzdeflate($contents)); // 开始编码$encode = '<?php'."\n eval(gzinflate(base64_decode("."'".$encode."'".")));\n\n?>";return file_put_contents($filename, $encode);}
return false;
}
//调用函数
$filename = 'dam.php';
encode_file_contents($filename);
echo "OK,加密完成！"
?>
加密方式2：
复制代码 代码如下:
<?php
function RandAbc($length = "") { // 返回随机字符串$str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmgame/534.html' target='_blank'>nopqrstuvwxyz";return str_shuffle($str);
}
$filename = 'index.php'; //要加密的文件
$T_k1 = RandAbc(); //随机密匙1
$T_k2 = RandAbc(); //随机密匙2
$vstr = file_get_contents($filename);
$v1 = base64_encode($vstr);
$c = strtr($v1, $T_k1, $T_k2); //根据密匙替换对应字符。
$c = $T_k1.$T_k2.$c;
$q1 = "O00O0O";
$q2 = "O0O000";
$q3 = "O0OO00";
$q4 = "OO0O00";
$q5 = "OO0000";
$q6 = "O00OO0";
$s = '$'.$q6.'=urldecode("%6E1%7A%62%2F%6D%615%5C%76%740%6928%2D%70%78%75%71%79%2A6%6C%72%6B%64%679%5F%65%68%63%73%77%6F4%2B%6637%6A");$'.$q1.'=$'.$q6.'{3}.$'.$q6.'{6}.$'.$q6.'{33}.$'.$q6.'{30};$'.$q3.'=$'.$q6.'{33}.$'.$q6.'{10}.$'.$q6.'{24}.$'.$q6.'{10}.$'.$q6.'{24};$'.$q4.'=$'.$q3.'{0}.$'.$q6.'{18}.$'.$q6.'{3}.$'.$q3.'{0}.$'.$q3.'{1}.$'.$q6.'{24};$'.$q5.'=$'.$q6.'{7}.$'.$q6.'{13};$'.$q1.'.=$'.$q6.'{22}.$'.$q6.'{36}.$'.$q6.'{29}.$'.$q6.'{26}.$'.$q6.'{30}.$'.$q6.'{32}.$'.$q6.'{35}.$'族没.$q6.'{26}.$'.$q6.'{30};eval($'.$q1.'("'.base64_encode('$'.$q2.'="'.$c.'";eval(\'?>\'.$'.$q1.'($'指斗.$q3.'($'.$q4.'($'.$q2.',$'.$q5.'*2),$'.$q4.'($'.$q2.',$'.$q5.',$'.$q5.'),$'.$q4.'($'.$q2.',0,$'.$q5.'))));').'"));';$s = '<?php '."\n".$s."\n".' ?>';
//echo $s;
// 生成 加密后的PHP文件
$fpp1 = fopen('temp_'.$filename, 'w');
fwrite($fpp1, $s) or die('写文件错误');
?>
其实，PHP加密源码方式有很多，譬如，免费的微盾PHP加密，还有 www.phpjm.net 搞的在线加密，只是phpjm更复杂点而已。
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++另外，分享一个 PHP类，它能对 文本的内容进行 二进制加密 与 解密，代码如下：
复制代码 代码如下:
<?php
class text_auth
{
var $n_iter;
function text_auth()
{
$this->setIter(32);
}
function setIter($n_iter)
{
$this->n_iter = $n_iter;
}
function getIter()
{
return $this->n_iter;
}
function encrypt($data, $key)
{
$n = $this->_resize($data, 4);
$data_long[0] = $n;
$n_data_long = $this->_str2long(1, $data, $data_long);$n = count($data_long);
if (($n & 1) == 1) {
$data_long[$n] = chr(0);
$n_data_long++;
}
$this->_resize($key, 16, true);
if ( '' == $key )
$key = '0000000000000000';
$n_key_long = $this->_str2long(0, $key, $key_long);$enc_data = '';
$w = array(0, 0);
$j = 0;
$k = array(0, 0, 0, 0);
for ($i = 0; $i < $n_data_long; ++$i) {
if ($j + 4 <= $n_key_long) {
$k[0] = $key_long[$j];
$k[1] = $key_long[$j + 1];
$k[2] = $key_long[$j + 2];
$k[3] = $key_long[$j + 3];
} else {
$k[0] = $key_long[$j % $n_key_long];
$k[1] = $key_long[($j + 1) % $n_key_long];$k[2] = $key_long[($j + 2) % $n_key_long];$k[3] = $key_long[($j + 3) % $n_key_long];}
$j = ($j + 4) % $n_key_long;
$this->_encipherLong($data_long[$i], $data_long[++$i], $w, $k);$enc_data .= $this->_long2str($w[0]);
$enc_data .= $this->_long2str($w[1]);
}
return $enc_data;
}
function decrypt($enc_data, $key)
{
$n_enc_data_long = $this->_str2long(0, $enc_data, $enc_data_long);$this->_resize($key, 16, true);
if ( '' == $key )
$key = '0000000000000000';
$n_key_long = $this->_str2long(0, $key, $key_long);$data = '';
$w = array(0, 0);
$j = 0;
$len = 0;
$k = array(0, 0, 0, 0);
$pos = 0;
for ($i = 0; $i < $n_enc_data_long; $i += 2) {if ($j + 4 <= $n_key_long) {
$k[0] = $key_long[$j];
$k[1] = $key_long[$j + 1];
$k[2] = $key_long[$j + 2];
$k[3] = $key_long[$j + 3];
} else {
$k[0] = $key_long[$j % $n_key_long];
$k[1] = $key_long[($j + 1) % $n_key_long];$k[2] = $key_long[($j + 2) % $n_key_long];$k[3] = $key_long[($j + 3) % $n_key_long];}
$j = ($j + 4) % $n_key_long;
$this->_decipherLong($enc_data_long[$i], $enc_data_long[$i + 1], $w, $k);if (0 == $i) {
$len = $w[0];
if (4 <= $len) {
$data .= $this->_long2str($w[1]);
} else {
$data .= substr($this->_long2str($w[1]), 0, $len % 4);}
} else {
$pos = ($i - 1) * 4;
if ($pos + 4 <= $len) {
$data .= $this->_long2str($w[0]);
if ($pos + 8 <= $len) {
$data .= $this->_long2str($w[1]);
} elseif ($pos + 4 < $len) {
$data .= substr($this->_long2str($w[1]), 0, $len % 4);}
} else {
$data .= substr($this->_long2str($w[0]), 0, $len % 4);}
}
}
return $data;
}
function _encipherLong($y, $z, &$w, &$k)
{
$sum = (integer) 0;
$delta = 0x9E3779B9;
$n = (integer) $this->n_iter;
while ($n-- > 0) {
$y = $this->_add($y,
$this->_add($z << 4 ^ $this->_rshift($z, 5), $z) ^$this->_add($sum, $k[$sum & 3]));
$sum = $this->_add($sum, $delta);
$z = $this->_add($z,
$this->_add($y << 4 ^ $this->_rshift($y, 5), $y) ^$this->_add($sum, $k[$this->_rshift($sum, 11) & 3]));}
$w[0] = $y;
$w[1] = $z;
}
function _decipherLong($y, $z, &$w, &$k)
{
$sum = 0xC6EF3720;
$delta = 0x9E3779B9;
$n = (integer) $this->n_iter;
while ($n-- > 0) {
$z = $this->_add($z,
-($this->_add($y << 4 ^ $this->_rshift($y, 5), $y) ^$this->_add($sum, $k[$this->_rshift($sum, 11) & 3])));$sum = $this->_add($sum, -$delta);
$y = $this->_add($y,
-($this->_add($z << 4 ^ $this->_rshift($z, 5), $z) ^$this->_add($sum, $k[$sum & 3])));
}
$w[0] = $y;
$w[1] = $z;
}
function _resize(&$data, $size, $nonull = false){
$n = strlen($data);
$nmod = $n % $size;
if ( 0 == $nmod )
$nmod = $size;
if ($nmod > 0) {
if ($nonull) {
for ($i = $n; $i < $n - $nmod + $size; ++$i) {$data[$i] = $data[$i % $n];
}
} else {
for ($i = $n; $i < $n - $nmod + $size; ++$i) {$data[$i] = chr(0);
}
}
}
return $n;
}
function _hex2bin($str)
{
$len = strlen($str);
return pack('H' . $len, $str);
}
function _str2long($start, &$data, &$data_long){
$n = strlen($data);
$tmp = unpack('N*', $data);
$j = $start;
foreach ($tmp as $value)
$data_long[$j++] = $value;
return $j;
}
function _long2str($l)
{
return pack('N', $l);
}
function _rshift($integer, $n)
{
if (0xffffffff < $integer || -0xffffffff > $integer) {$integer = fmod($integer, 0xffffffff + 1);}
if (0x7fffffff < $integer) {
$integer -= 0xffffffff + 1.0;
} elseif (-0x80000000 > $integer) {
$integer += 0xffffffff + 1.0;
}
if (0 > $integer) {
$integer &= 0x7fffffff;
$integer >>= $n;
$integer |= 1 << (31 - $n);
} else {
$integer >>= $n;
}
return $integer;
}
function _add($i1, $i2)
{
$result = 0.0;
foreach (func_get_args() as $value) {
if (0.0 > $value) {
$value -= 1.0 + 0xffffffff;
}
$result += $value;
}
if (0xffffffff < $result || -0xffffffff > $result) {$result = fmod($result, 0xffffffff + 1);
}
if (0x7fffffff < $result) {
$result -= 0xffffffff + 1.0;
} elseif (-0x80000000 > $result) {
$result += 0xffffffff + 1.0;
}
return $result;
}
}
?>
使用方法参考如下：
// 加密过程
view sourceprint?
$text_file = S_ROOT . './456.php';
$str = @file_get_contents($text_file);
require_once S_ROOT . "./text_auth.php";
$text_auth = new text_auth(64);
$str = $text_auth->encrypt($str, "qianyunlai.com");$filename = S_ROOT . './789.php'; // 加密后的文本为二进制，普通的文本编辑器无法正常查看file_put_contents($filename, $str);
// 解密过程
view sourceprint
?01 $text_file = S_ROOT . './789.php';
$str = @file_get_contents($text_file);
require_once S_ROOT . "./text_auth.php";
$text_auth = new text_auth(64);
$str = $text_auth->decrypt($str, "qianyunlai.com");$filename = S_ROOT . './456.php';
file_put_contents($filename, $str);

des密码算法程序

去观察学编程 科技馆里的奥秘 python语言程序设计入门启蒙教材信息
纯C的
#include "岩银或stdio.h"
#include "memory.h"
#include "time.h"搏尘
#include "stdlib.h"
#define PLAIN_FILE_OPEN_ERROR -1
#define KEY_FILE_OPEN_ERROR -2
#define CIPHER_FILE_OPEN_ERROR -3
#define OK 1
typedef char ElemType;
/*初始置换表IP*/
int IP_Table[64] = { 57,49,41,33,25,17,9,1,
59,51,43,35,27,19,11,3,
61,53,45,37,29,21,13,5,
63,55,47,39,31,23,15,7,
56,48,40,32,24,16,8,0,
58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6};
/*逆初始置换表IP^-1*/
int IP_1_Table[64] = {39,7,47,15,55,23,63,31,
38,6,46,14,54,22,62,30,
37,5,45,13,53,21,61,29,
36,4,44,12,52,20,60,28,
35,3,43,11,51,19,59,27,
34,2,42,10,50,18,58,26,
33,1,41,9,49,17,57,25,
32,0,40,8,48,16,56,24};
/*扩充置换表E*/
int E_Table[48] = {31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8,9,10,11,12,
11,12,13,14,15,16,
15,16,17,18,19,20,
19,20,21,22,23,24,
23,24,25,26,27,28,
27,28,29,30,31, 0};
/*置换函数P*/
int P_Table[32] = {15,6,19,20,28,11,27,16,
0,14,22,25,4,17,30,9,
1,7,23,13,31,26,2,8,
18,12,29,5,21,10,3,24};
/*S盒*/
int S[8][4][16] =
/*S1*/
{{{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
{0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},
{4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},
{15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}},
/粗伍*S2*/
{{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},
{3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},
{0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15},
{13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}},
/*S3*/
{{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8},
{13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1},
{13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7},
{1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}},
/*S4*/
{{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15},
{13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9},
{10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4},
{3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}},
/*S5*/
{{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9},
{14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6},
{4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14},
{11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}},
/*S6*/
{{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11},
{10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8},
{9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6},
{4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}},
/*S7*/
{{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1},
{13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6},
{1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2},
{6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}},
/*S8*/
{{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7},
{1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},
{7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}}};
/*置换选择1*/
int PC_1[56] = {56,48,40,32,24,16,8,
0,57,49,41,33,25,17,
9,1,58,50,42,34,26,
18,10,2,59,51,43,35,
62,54,46,38,30,22,14,
6,61,53,45,37,29,21,
13,5,60,52,44,36,28,
20,12,4,27,19,11,3};
/*置换选择2*/
int PC_2[48] = {13,16,10,23,0,4,2,27,
14,5,20,9,22,18,11,3,
25,7,15,6,26,19,12,1,
40,51,30,36,46,54,29,39,
50,44,32,46,43,48,38,55,
33,52,45,41,49,35,28,31};
/*对左移次数的规定*/
int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
int ByteToBit(ElemType ch,ElemType bit[8]);
int BitToByte(ElemType bit[8],ElemType *ch);
int Char8ToBit64(ElemType ch[8],ElemType bit[64]);
int Bit64ToChar8(ElemType bit[64],ElemType ch[8]);
int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]);
int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]);
int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]);
int DES_ROL(ElemType data[56], int time);
int DES_IP_Transform(ElemType data[64]);
int DES_IP_1_Transform(ElemType data[64]);
int DES_E_Transform(ElemType data[48]);
int DES_P_Transform(ElemType data[32]);
int DES_SBOX(ElemType data[48]);
int DES_XOR(ElemType R[48], ElemType L[48],int count);
int DES_Swap(ElemType left[32],ElemType right[32]);
int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]);
int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48], ElemType plainBlock[8]);
int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile);
int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile);
/*字节转换成二进制*/
int ByteToBit(ElemType ch, ElemType bit[8]){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*(bit+cnt) = (ch>>cnt)&1;
}
return 0;
}
/*二进制转换成字节*/
int BitToByte(ElemType bit[8],ElemType *ch){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*ch |= *(bit + cnt)<<cnt;
}
return 0;
}
/*将长度为8的字符串转为二进制位串*/
int Char8ToBit64(ElemType ch[8],ElemType bit[64]){
int cnt;
for(cnt = 0; cnt < 8; cnt++){
ByteToBit(*(ch+cnt),bit+(cnt<<3));
}
return 0;
}
/*将二进制位串转为长度为8的字符串*/
int Bit64ToChar8(ElemType bit[64],ElemType ch[8]){
int cnt;
memset(ch,0,8);
for(cnt = 0; cnt < 8; cnt++){
BitToByte(bit+(cnt<<3),ch+cnt);
}
return 0;
}
/*生成子密钥*/
int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]){
ElemType temp[56];
int cnt;
DES_PC1_Transform(key,temp);/*PC1置换*/
for(cnt = 0; cnt < 16; cnt++){/*16轮跌代，产生16个子密钥*/
DES_ROL(temp,MOVE_TIMES[cnt]);/*循环左移*/
DES_PC2_Transform(temp,subKeys[cnt]);/*PC2置换，产生子密钥*/
}
return 0;
}
/*密钥置换1*/
int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]){
int cnt;
for(cnt = 0; cnt < 56; cnt++){
tempbts[cnt] = key[PC_1[cnt]];
}
return 0;
}
/*密钥置换2*/
int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]){
int cnt;
for(cnt = 0; cnt < 48; cnt++){
tempbts[cnt] = key[PC_2[cnt]];
}
return 0;
}
/*循环左移*/
int DES_ROL(ElemType data[56], int time){
ElemType temp[56];
/*保存将要循环移动到右边的位*/
memcpy(temp,data,time);
memcpy(temp+time,data+28,time);
/*前28位移动*/
memcpy(data,data+time,28-time);
memcpy(data+28-time,temp,time);
/*后28位移动*/
memcpy(data+28,data+28+time,28-time);
memcpy(data+56-time,temp+time,time);
return 0;
}
/*IP置换*/
int DES_IP_Transform(ElemType data[64]){
int cnt;
ElemType temp[64];
for(cnt = 0; cnt < 64; cnt++){
temp[cnt] = data[IP_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
/*IP逆置换*/
int DES_IP_1_Transform(ElemType data[64]){
int cnt;
ElemType temp[64];
for(cnt = 0; cnt < 64; cnt++){
temp[cnt] = data[IP_1_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
/*扩展置换*/
int DES_E_Transform(ElemType data[48]){
int cnt;
ElemType temp[48];
for(cnt = 0; cnt < 48; cnt++){
temp[cnt] = data[E_Table[cnt]];
}
memcpy(data,temp,48);
return 0;
}
/*P置换*/
int DES_P_Transform(ElemType data[32]){
int cnt;
ElemType temp[32];
for(cnt = 0; cnt < 32; cnt++){
temp[cnt] = data[P_Table[cnt]];
}
memcpy(data,temp,32);
return 0;
}
/*异或*/
int DES_XOR(ElemType R[48], ElemType L[48] ,int count){
int cnt;
for(cnt = 0; cnt < count; cnt++){
R[cnt] ^= L[cnt];
}
return 0;
}
/*S盒置换*/
int DES_SBOX(ElemType data[48]){
int cnt;
int line,row,output;
int cur1,cur2;
for(cnt = 0; cnt < 8; cnt++){
cur1 = cnt*6;
cur2 = cnt<<2;
/*计算在S盒中的行与列*/
line = (data[cur1]<<1) + data[cur1+5];
row = (data[cur1+1]<<3) + (data[cur1+2]<<2)
+ (data[cur1+3]<<1) + data[cur1+4];
output = S[cnt][line][row];
/*化为2进制*/
data[cur2] = (output&0X08)>>3;
data[cur2+1] = (output&0X04)>>2;
data[cur2+2] = (output&0X02)>>1;
data[cur2+3] = output&0x01;
}
return 0;
}
/*交换*/
int DES_Swap(ElemType left[32], ElemType right[32]){
ElemType temp[32];
memcpy(temp,left,32);
memcpy(left,right,32);
memcpy(right,temp,32);
return 0;
}
/*加密单个分组*/
int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]){
ElemType plainBits[64];
ElemType copyRight[48];
int cnt;
Char8ToBit64(plainBlock,plainBits);
/*初始置换（IP置换）*/
DES_IP_Transform(plainBits);
/*16轮迭代*/
for(cnt = 0; cnt < 16; cnt++){
memcpy(copyRight,plainBits+32,32);
/*将右半部分进行扩展置换，从32位扩展到48位*/
DES_E_Transform(copyRight);
/*将右半部分与子密钥进行异或操作*/
DES_XOR(copyRight,subKeys[cnt],48);
/*异或结果进入S盒，输出32位结果*/
DES_SBOX(copyRight);
/*P置换*/
DES_P_Transform(copyRight);
/*将明文左半部分与右半部分进行异或*/
DES_XOR(plainBits,copyRight,32);
if(cnt != 15){
/*最终完成左右部的交换*/
DES_Swap(plainBits,plainBits+32);
}
}
/*逆初始置换（IP^1置换）*/
DES_IP_1_Transform(plainBits);
Bit64ToChar8(plainBits,cipherBlock);
return 0;
}
/*解密单个分组*/
int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48],ElemType plainBlock[8]){
ElemType cipherBits[64];
ElemType copyRight[48];
int cnt;
Char8ToBit64(cipherBlock,cipherBits);
/*初始置换（IP置换）*/
DES_IP_Transform(cipherBits);
/*16轮迭代*/
for(cnt = 15; cnt >= 0; cnt--){
memcpy(copyRight,cipherBits+32,32);
/*将右半部分进行扩展置换，从32位扩展到48位*/
DES_E_Transform(copyRight);
/*将右半部分与子密钥进行异或操作*/
DES_XOR(copyRight,subKeys[cnt],48);
/*异或结果进入S盒，输出32位结果*/
DES_SBOX(copyRight);
/*P置换*/
DES_P_Transform(copyRight);
/*将明文左半部分与右半部分进行异或*/
DES_XOR(cipherBits,copyRight,32);
if(cnt != 0){
/*最终完成左右部的交换*/
DES_Swap(cipherBits,cipherBits+32);
}
}
/*逆初始置换（IP^1置换）*/
DES_IP_1_Transform(cipherBits);
Bit64ToChar8(cipherBits,plainBlock);
return 0;
}
/*加密文件*/
int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile){
FILE *plain,*cipher;
int count;
ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
ElemType bKey[64];
ElemType subKeys[16][48];
if((plain = fopen(plainFile,"rb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
if((cipher = fopen(cipherFile,"wb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
/*设置密钥*/
memcpy(keyBlock,keyStr,8);
/*将密钥转换为二进制流*/
Char8ToBit64(keyBlock,bKey);
/*生成子密钥*/
DES_MakeSubKeys(bKey,subKeys);
while(!feof(plain)){
/*每次读8个字节，并返回成功读取的字节数*/
if((count = fread(plainBlock,sizeof(char),8,plain)) == 8){
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
fwrite(cipherBlock,sizeof(char),8,cipher);
}
}
if(count){
/*填充*/
memset(plainBlock + count,'\0',7 - count);
/*最后一个字符保存包括最后一个字符在内的所填充的字符数量*/
plainBlock[7] = 8 - count;
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
fwrite(cipherBlock,sizeof(char),8,cipher);
}
fclose(plain);
fclose(cipher);
return OK;
}
/*解密文件*/
int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile){
FILE *plain, *cipher;
int count,times = 0;
long fileLen;
ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
ElemType bKey[64];
ElemType subKeys[16][48];
if((cipher = fopen(cipherFile,"rb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
if((plain = fopen(plainFile,"wb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
/*设置密钥*/
memcpy(keyBlock,keyStr,8);
/*将密钥转换为二进制流*/
Char8ToBit64(keyBlock,bKey);
/*生成子密钥*/
DES_MakeSubKeys(bKey,subKeys);
/*取文件长度 */
fseek(cipher,0,SEEK_END);/*将文件指针置尾*/
fileLen = ftell(cipher); /*取文件指针当前位置*/
rewind(cipher); /*将文件指针重指向文件头*/
while(1){
/*密文的字节数一定是8的整数倍*/
fread(cipherBlock,sizeof(char),8,cipher);
DES_DecryptBlock(cipherBlock,subKeys,plainBlock);
times += 8;
if(times < fileLen){
fwrite(plainBlock,sizeof(char),8,plain);
}
else{
break;
}
}
/*判断末尾是否被填充*/
if(plainBlock[7] < 8){
for(count = 8 - plainBlock[7]; count < 7; count++){
if(plainBlock[count] != '\0'){
break;
}
}
}
if(count == 7){/*有填充*/
fwrite(plainBlock,sizeof(char),8 - plainBlock[7],plain);
}
else{/*无填充*/
fwrite(plainBlock,sizeof(char),8,plain);
}
fclose(plain);
fclose(cipher);
return OK;
}
int main()
{
clock_t a,b;
a = clock();
DES_Encrypt("1.txt","key.txt","2.txt");
b = clock();
printf("加密消耗%d毫秒\n",b-a);
system("pause");
a = clock();
DES_Decrypt("2.txt","key.txt","3.txt");
b = clock();
printf("解密消耗%d毫秒\n",b-a);
getchar();
return 0;
}

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