TEA加密算法

来源：互联网发布：苏有朋斥周杰炒作知乎编辑：程序博客网时间：2024/05/28 22:13
TEA加密算法：
#include <stdio.h>#include <stdlib.h>#include <string.h>#define mun_rounds 32void encipher(unsigned int v[2],unsigned int key[4]){    unsigned int i;    unsigned int v0 = v[0],v1 = v[1],sum = 0,delta = 0x9E3779B9;    for(i=0;i<mun_rounds;i++)    {        v0+=(((v1<<4)^(v1>>5))+v1)^(sum+key[sum&3]);        sum+=delta;        v1+=(((v0<<4)^(v0>>5))+v0)^(sum+key[(sum>>11)&3]);    }    v[0] = v0;    v[1] = v1;}void decipher(unsigned int v[2],unsigned int key[4]){    unsigned int i;    unsigned int v0 = v[0],v1 = v[1],delta = 0x9E3779B9,sum =mun_rounds*delta ;    for(i=0;i<mun_rounds;i++)    {        v1-=(((v0<<4)^(v0>>5))+v0)^(sum+key[(sum>>11)&3]);        sum-=delta;        v0-=(((v1<<4)^(v1>>5))+v1)^(sum+key[sum&3]);    }    v[0] = v0;    v[1] = v1;}int main(int argc,char* argv[]){    if(argc!= 5)    {        printf("\nUsage : kezhixingwenjian e password sourfile outfile\n");        printf("\nUsage : kezhixingwenjian r password sourfile outfile\n");        return 0;    }    char password[100] = {0};    strcpy(password,argv[2]);    FILE *fpin = fopen(argv[3],"rb");    FILE *fpout = fopen(argv[4],"wb");    if(fpin != NULL && fpout != NULL)    {        while(!feof(fpin))        {            unsigned int msg[2];            msg[0] = msg[1] = 0;            if(fread(msg,1,8,fpin)==0)break;            if(argv[1][0]=='e')            {                encipher(msg,(unsigned int*)password);            }            else            {                decipher(msg,(unsigned int*)password);            }            fwrite(msg,1,8,fpout);        }    }    fclose(fpin);    fclose(fpout);    return 0;}
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