RC4加解密算法
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#include <stdio.h>
#include <string.h>
typedef unsigned long ULONG;
void rc4_init(unsigned char *s, unsigned char *key, unsigned long Len) //初始化函数
{
int i = 0;
int j = 0;
char k[256] = {0};
unsigned char tmp = 0;
for(i=0;i<256;i++)
{
s[i]=i;
k[i]=key[i%Len];
}
for (i=0; i<256; i++)
{
j=(j+s[i]+k[i])%256;
tmp = s[i];
s[i] = s[j]; //交换s[i]和s[j]
s[j] = tmp;
}
}
void rc4_crypt(unsigned char *s, unsigned char *Data, unsigned long Len) //加解密
{
int i = 0, j = 0, t = 0;
unsigned long k = 0;
unsigned char tmp;
for(k=0;k<Len;k++)
{
i=(i+1)%256;
j=(j+s[i])%256;
tmp = s[i];
s[i] = s[j]; //交换s[x]和s[y]
s[j] = tmp;
t=(s[i]+s[j])%256;
Data[k] ^= s[t];
}
}
void main()
{
int i=0;
unsigned char s[256] = {0},s2[256] = {0}; //S-box
char key[256] = {"just for test"};
char pData[512] = "这是一个用来加密的数据Data";
ULONG len = strlen(pData);
printf("pData = %s\n",pData);
printf("key = %s, length = %d\n\n",key,strlen(key));
rc4_init(s,(unsigned char *)key,strlen(key)); //已经完成了初始化
printf("完成对S[i]的初始化,如下:\n\n");
for(; i<256; i++)
{
printf("%-3d ",s[i]);
}
printf("\n\n");
for(i=0;i<256;i++)//用s2[i]暂时保留经过初始化的s[i],很重要的!!!
{
s2[i]=s[i];
}
printf("已经初始化,现在加密:\n\n");
printf("pData = %d\n\n",len);
rc4_crypt(s,(unsigned char *)pData,len);//加密
printf("pData = %s\n\n",pData);
printf("pData = %d\n\n",strlen(pData));
printf("已经加密,现在解密:\n\n");
rc4_init(s,(unsigned char *)key, strlen(key)); //初始化密钥
rc4_crypt(s2,(unsigned char *)pData,len);//解密
printf("pData = %s\n\n",pData);
printf("pData = %d\n\n",strlen(pData));
}
#include <string.h>
typedef unsigned long ULONG;
void rc4_init(unsigned char *s, unsigned char *key, unsigned long Len) //初始化函数
{
int i = 0;
int j = 0;
char k[256] = {0};
unsigned char tmp = 0;
for(i=0;i<256;i++)
{
s[i]=i;
k[i]=key[i%Len];
}
for (i=0; i<256; i++)
{
j=(j+s[i]+k[i])%256;
tmp = s[i];
s[i] = s[j]; //交换s[i]和s[j]
s[j] = tmp;
}
}
void rc4_crypt(unsigned char *s, unsigned char *Data, unsigned long Len) //加解密
{
int i = 0, j = 0, t = 0;
unsigned long k = 0;
unsigned char tmp;
for(k=0;k<Len;k++)
{
i=(i+1)%256;
j=(j+s[i])%256;
tmp = s[i];
s[i] = s[j]; //交换s[x]和s[y]
s[j] = tmp;
t=(s[i]+s[j])%256;
Data[k] ^= s[t];
}
}
void main()
{
int i=0;
unsigned char s[256] = {0},s2[256] = {0}; //S-box
char key[256] = {"just for test"};
char pData[512] = "这是一个用来加密的数据Data";
ULONG len = strlen(pData);
printf("pData = %s\n",pData);
printf("key = %s, length = %d\n\n",key,strlen(key));
rc4_init(s,(unsigned char *)key,strlen(key)); //已经完成了初始化
printf("完成对S[i]的初始化,如下:\n\n");
for(; i<256; i++)
{
printf("%-3d ",s[i]);
}
printf("\n\n");
for(i=0;i<256;i++)//用s2[i]暂时保留经过初始化的s[i],很重要的!!!
{
s2[i]=s[i];
}
printf("已经初始化,现在加密:\n\n");
printf("pData = %d\n\n",len);
rc4_crypt(s,(unsigned char *)pData,len);//加密
printf("pData = %s\n\n",pData);
printf("pData = %d\n\n",strlen(pData));
printf("已经加密,现在解密:\n\n");
rc4_init(s,(unsigned char *)key, strlen(key)); //初始化密钥
rc4_crypt(s2,(unsigned char *)pData,len);//解密
printf("pData = %s\n\n",pData);
printf("pData = %d\n\n",strlen(pData));
}
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