RSA算法C语言代码

1、#include<>#include<>#include<>#include<>#include<>chars100,*c;intn,e,d,i,C,j,k=0,len;intstr100,b30;unsignedgcd(unsigneda,unsignedb)if(a%b=0)returnb;elsereturngcd(b,a%b);voidEgcd(inta,intb,int&x,int&y)/ax-by=1if(b=0|a=0)x=1;y=0;return;if(a<b)Egcd(a,b%a,x,y);x=

2、(int)(b*y+1)/a;elseEgcd(a%b,b,x,y);y=(int)(a*x-1)/b;voidRSA()intp,q,N,Y;printf("请输入素数p和q：")；scanf("%d%d",&p,&q);n=p*q;N=(p-1)*(q-1);/printf("n=%dN=%dn",n,N);srand(unsigned)time(NULL);/while(1)/e=rand()%N;/printf("e=%dn",e);if(e=0)continue;if(gcd(N,e)=1

3、)break;/printf("e=%dn",e);Egcd(e,N,d,Y);/printf("d=%dY=%dn",d,Y);printf("公钥PU=e=%d,n=%dn",e,n);printf("私钥PR=d=%d,n=%dn",d,n);voidencrypt()/加密函数len=strlen(s);/hgprintf("len=%dn",len);for(i=0;i<len;i+)/if(si<97|si>122)bk=i;k+;for(j=i;j<len-

4、1;j+)sj=sj+1;len-;slen='0'/结束符printf("密文是：");初始化随机数产生随机整数e, e与NS质去掉 s100 中的空格for(i=0;i<len;i+)C=1;/printf("shiji=%dn",si-97);for(intj=0;j<e;j+)C=(C*(si-97)%n;/printf("C=%ldn",C);stri=C;printf("%d",stri);printf("n");voiddecrypt()/解密函数c=(

5、char*)malloc(len*sizeof(int);for(i=0;i<len;i+)/实现解密C=1;for(intj=0;j<d;j+)C=(C*(stri)%n;/printf("C=%ldn",C);/printf("C=%dn",C);ci=C+97;ci='0'/puts(c);for(intz=0;z<k;z+)/加空格for(i=0;i<len;i+)if(i=bz)for(j=len;j>i;j-)cj=cj-1;ci=''len+;bz+1=bz+1+(z+1);br

6、eak;)clen='0'printf("明文：");puts(c);)intfunction()/系统功能选择页面(intchoice;printf("=n");printf("欢迎进入RSA?法n");printf("1-加密n");printf("2-解密n");printf("3-退出n");printf("=n");printf("请输入要选择的功能号：")；scanf("%d",&choice);returnchoice;)intmain()(intfunction();intfc;printf("请输入初始明文gets(s);/puts(s);RSA();/while(1)(fc=function();if(fc=1)/encrypt();elseif(fc=2