最近在做一个网页的时候，涉及到加密，于是想到用的des来加密，在网上找到的大部分是用c写的程序，没办法直接在网页里调用。后来想用控件来实现，但是这种方法显得有点烦。因此改为脚本语言来写了，这里提供的是用javascript写的,用vbscript也可实现。这里给出代码，仅供大家参考和使用。
<script language="JavaScript">
// by liuminghua at 2005.1.10
var g_ip=new Array( //初始置换ip
58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7
);
var g_invip=new Array( //逆初始置换ip
40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25
);
var g_e=new Array( //e 选位表
32,1,2,3,4,5,4,5,6,7,8,9,8,9,10,11,12,13,12,13,14,15,16,17,16,17,18,19,20,21,20,21,22,23,24,25,24,25,26,27,28,29,28,29,30,31,32,31
);
var g_p=new Array( //p 选位表
16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10,2,8,24,14,32,27,3,9,19,13,30,6,22,11,4,25
);
var g_s=new Array( //8个s合
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,
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,
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,
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,
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,
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,
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,
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
);
var g_keyOut=new Array(768);
function InitKey(str_Key)
{
var pc1=new Array( //对64bit密钥进行置换为56位
57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,27,19,11,3,60,52,44,36,63,55,47,39,31,23,15,7,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,12,4
);
var pc2=new Array( //对经过移位得到的64bit选位得到48位密钥
14,17,11,24,1,5,3,28,15,6,21,10,23,19,12,4,26,8,16,7,27,20,13,2,41,52,31,37,47,55,30,40,51,45,33,48,44,49,39,56,34,53,46,42,50,36,29,32
);
var nls=new Array(1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1);
var b_array_key = new Array(64);
for(n=i=0;i<8;i++)
b_array_key[n++]=str_Key.charCodeAt(i)>>i&0x01; //获得二进制
var cd=new Array(56);
var c=new Array(28);
var d=new Array(28);
for(i=0;i<56;i++)
cd[i]=b_array_key[pc1[i]-1];
for(i=0;i<28;i++){
c[i]=cd[i];
d[i]=cd[i+28]; //分离c,d
}
for(cnt=0;cnt<16;cnt++){
for(i=0;i<nls[cnt];i++){
c=lshift(c);
d=lshift(d);
}
for(i=0;i<28;i++){
cd[i]=c[i];
cd[28+i]=d[i];
}
for(i=0;i<48;i++){
g_keyOut[cnt*48+i]=cd[pc2[i]-1];
}
}
}
function lshift(p_Array) //循环左移一位
{
var tmp_Array=new Array(28);
for(i=0;i<27;i++) tmp_Array[i]=p_Array[i+1];
tmp_Array[27]=p_Array[0];
return tmp_Array;
}
function frk(p_array_r,cnt)
{
var b_array_fout=new Array(32);
var b_array_expand=new Array(48);
var array_pout=new Array(48);
for(i=0;i<48;i++){ //将32位转换为48位
b_array_expand[i]=p_array_r[g_e[i]-1];
}
var b_array_dor = new Array(48);
for(i=0;i<48;i++){ //再与密钥ki按位异或，8组，每组6bit
b_array_dor[i]= b_array_expand[i]^g_keyOut[cnt*48+i];
}
for(scnt=n=0;scnt<8;scnt++){
row=(b_array_dor[scnt*6+0]<<1)+b_array_dor[scnt*6+5];
col=(b_array_dor[scnt*6+1]<<3)+(b_array_dor[scnt*6+2]<<2)+(b_array_dor[scnt*6+3]<<1)+b_array_dor[scnt*6+4]
var sout=new Array(8);
sout[scnt]=g_s[scnt*64+(row<<4)+col];
for(i=3;i>=0;i--){
array_pout[n]=sout[scnt]>>i;
sout[scnt]=sout[scnt]-(array_pout[n++]<<i);
}
}
for(i=0;i<32;i++)
b_array_fout[i]=array_pout[g_p[i]-1];
return b_array_fout;
}
function Des_EnCrypt(str_input) //加密
{
// InitKey("454554454"); //only test , here
var b_array_input = new Array(64);
var b_array_lr = new Array(64);
var b_array_l = new Array(32);
var b_array_r = new Array(32);
var b_array_fn = new Array(32);
for(n=i=0;i<8;i++)
for(j=0;j<8;j++)
b_array_input[n++]=str_input.charCodeAt(i)>>j&0x01; //获得二进制
for(i=0;i<64;i++){
b_array_lr[i]=b_array_input[g_ip[i]-1];
if(i<32) b_array_l[i] = b_array_lr[i];
else b_array_r[i-32] = b_array_lr[i]; //分离l,r
}
for(cnt=0;cnt<16;cnt++)
{
b_array_fn=frk(b_array_r,cnt);
for(i=0;i<32;i++){
j=b_array_r[i];
b_array_r[i]=b_array_l[i]^b_array_fn[i];
b_array_l[i]=j;
}
}
for(i=0;i<32;i++){
b_array_lr[i]=b_array_r[i];
b_array_lr[i+32]=b_array_l[i];
}
var fout=new Array(64);
for(i=0;i<64;i++) fout[i]=b_array_lr[g_invip[i]-1];
var strout="";
for(i=0;i<8;i++){
sum=0;
for(j=0;j<8;j++){
sum+=(fout[i*8+j]<<j);
}
strout+=String.fromCharCode(sum);
//document.write(String.fromCharCode(sum));
}
return strout;
}
function Des_deCrypt(str_input) //解密
{
var b_array_input = new Array(64);
var b_array_lr = new Array(64);
var b_array_l = new Array(32);
var b_array_r = new Array(32);
var b_array_fn = new Array(32);
for(n=i=0;i<8;i++)
for(j=0;j<8;j++)
b_array_input[n++]=str_input.charCodeAt(i)>>j&0x01; //获得二进制
for(i=0;i<64;i++){
b_array_lr[i]=b_array_input[g_ip[i]-1];
if(i<32) b_array_l[i] = b_array_lr[i];
else b_array_r[i-32] = b_array_lr[i]; //分离l,r
}
for(cnt=15;cnt>=0;cnt--)
{
b_array_fn=frk(b_array_r,cnt);
for(i=0;i<32;i++){
j=b_array_r[i];
b_array_r[i]=b_array_l[i]^b_array_fn[i];
b_array_l[i]=j;
}
}
for(i=0;i<32;i++){
b_array_lr[i]=b_array_r[i];
b_array_lr[i+32]=b_array_l[i];
}
var fout=new Array(64);
for(i=0;i<64;i++) fout[i]=b_array_lr[g_invip[i]-1];
var strout="";
for(i=0;i<8;i++){
sum=0;
for(j=0;j<8;j++){
sum+=(fout[i*8+j]<<j);
}
strout+=String.fromCharCode(sum);
}
return strout;
}
</script>
