VC++ RC4,加密解密, 使用问题

#include "rc4.h"

void main()

{

char key[]="abcd"

RC4_KEY stKey

BYTE d1[4]={0x11,0x22,0x33,0x44}

//加密

RC4Init(key,strlen(key),&stKey)

RC4Works(d1,4,&stKey)

//解密

RC4Init(key,strlen(key),&stKey)

RC4Works(d1,4,&stKey)

}

import javax.crypto.Cipher

import javax.crypto.spec.SecretKeySpec

import javax.xml.bind.DatatypeConverter

public class Test {

public static void main(String[] args) throws Exception{

Cipher cipher=Cipher.getInstance("RC4")

String pwd="123456"

String ptext="Hello World 你好"

SecretKeySpec key=new SecretKeySpec(pwd.getBytes("UTF-8"), "RC4")

cipher.init(Cipher.ENCRYPT_MODE, key)

byte[] cdata =cipher.update(ptext.getBytes("UTF-8"))

//解密

cipher.init(Cipher.DECRYPT_MODE, key)

byte[] ddata =cipher.update(cdata)

System.out.println("密码: "+pwd)

System.out.println("明文: "+ptext)

System.out.println("密文: "+DatatypeConverter.printHexBinary(cdata))

System.out.println("解密文: "+new String(ddata,"UTF-8"))

}

} 密码: 123456

明文: Hello World 你好

密文: 489D120B4B1342F30D5B46961D83E12B4875

解密文: Hello World 你好

RC4已经不太安全，只能用于一般加密，不能用于金融等紧要场合。

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

typedef unsigned long ULONG

void rc4_init(unsigned char *s, unsigned char *data,unsigned Len) { //初始化函数

int i,j

unsigned char k[256] = {0},tmp

for(i = 0i <256i++) {

s[i] = i

k[i] = data[i%Len]

}

for(i = 0i <256i++) {

j = (j + s[i] + k[i])%Len

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 = 0k <Lenk++) {

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]

}

}

int main() {

unsigned char s[256] = {0},st[256] = {0}//S-box

char key[256] = "just for test"

char pData[512] = "待加密数据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))//初始化

printf("完成对S[i]的初始化，如下：\n\n")

for(int i = 0i <256i++) {

printf("%-3d ",s[i])

}

printf("\n\n")

for(i = 0i <256i++) { //用st[i]暂时保留经过初始化的s[i]，很重要的！！！

st[i] = s[i]

}

printf("已经初始化，现在加密:\n\n")

rc4_crypt(s,(unsigned char *)pData,len)//加密

printf("pData = %s\n\n",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(st,(unsigned char *)pData,len)//解密

printf("pData = %s\n\n",pData)

return 0

}

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