c源代码加密
从别的地方抄来的
http://hi..com/493168771/blog/item/5816b034ca19fc44251f144c.html
#include "stdio.h"
#include "time.h"
#include "stdlib.h"
#define PLAIN_FILE_OPEN_ERROR -1
#define KEY_FILE_OPEN_ERROR -2
#define CIPHER_FILE_OPEN_ERROR -3
#define OK 1;
typedef char ElemType;
/* 初始置换表IP */
int IP_Table[64] = { 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,
56,48,40,32,24,16,8,0,
58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6};
/* 逆初始置换表IP^-1 */
int IP_1_Table[64] = {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,
32,0,40,8,48,16,56,24};
/* 扩充置换表E */
int E_Table[48] = {31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8,9,10,11,12,
11,12,13,14,15,16,
15,16,17,18,19,20,
19,20,21,22,23,24,
23,24,25,26,27,28,
27,28,29,30,31, 0};
/* 置换函数P */
int P_Table[32] = {15,6,19,20,28,11,27,16,
0,14,22,25,4,17,30,9,
1,7,23,13,31,26,2,8,
18,12,29,5,21,10,3,24};
/* S盒 */
int S[8][4][16] =/* S1 */
{{{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}},
/* S2 */
{{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}},
/* S3 */
{{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}},
/* S4 */
{{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}},
/* S5 */
{{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}},
/* S6 */
{{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}},
/* S7 */
{{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}},
/* S8 */
{{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}}};
/* 置换选择1 */
int PC_1[56] = {56,48,40,32,24,16,8,
0,57,49,41,33,25,17,
9,1,58,50,42,34,26,
18,10,2,59,51,43,35,
62,54,46,38,30,22,14,
6,61,53,45,37,29,21,
13,5,60,52,44,36,28,
20,12,4,27,19,11,3};
/* 置换选择2 */
int PC_2[48] = {13,16,10,23,0,4,2,27,
14,5,20,9,22,18,11,3,
25,7,15,6,26,19,12,1,
40,51,30,36,46,54,29,39,
50,44,32,46,43,48,38,55,
33,52,45,41,49,35,28,31};
/* 对左移次数的规定 */
int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
int ByteToBit(ElemType ch,ElemType bit[8]);
int BitToByte(ElemType bit[8],ElemType *ch);
int Char8ToBit64(ElemType ch[8],ElemType bit[64]);
int Bit64ToChar8(ElemType bit[64],ElemType ch[8]);
int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]);
int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]);
int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]);
int DES_ROL(ElemType data[56], int time);
int DES_IP_Transform(ElemType data[64]);
int DES_IP_1_Transform(ElemType data[64]);
int DES_E_Transform(ElemType data[48]);
int DES_P_Transform(ElemType data[32]);
int DES_SBOX(ElemType data[48]);
int DES_XOR(ElemType R[48], ElemType L[48],int count);
int DES_Swap(ElemType left[32],ElemType right[32]);
int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]);
int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48], ElemType plainBlock[8]);
int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile);
int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile);
/* 字节转换成二进制 */
int ByteToBit(ElemType ch, ElemType bit[8]){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*(bit+cnt) = (ch>>cnt)&1;
}
return 0;
}
/* 二进制转换成字节 */
int BitToByte(ElemType bit[8],ElemType *ch){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*ch |= *(bit + cnt)<<cnt;
}
return 0;
}
/* 将长度为8的字符串转为二进制位串 */
int Char8ToBit64(ElemType ch[8],ElemType bit[64]){
int cnt;
for(cnt = 0; cnt < 8; cnt++){
ByteToBit(*(ch+cnt),bit+(cnt<<3));
}
return 0;
}
/* 将二进制位串转为长度为8的字符串 */
int Bit64ToChar8(ElemType bit[64],ElemType ch[8]){
int cnt;
memset(ch,0,8);
for(cnt = 0; cnt < 8; cnt++){
BitToByte(bit+(cnt<<3),ch+cnt);
}
return 0;
}
/* 生成子密钥 */
int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]){
ElemType temp[56];
int cnt;
DES_PC1_Transform(key,temp);/* PC1置换 */
for(cnt = 0; cnt < 16; cnt++){/* 16轮跌代,产生16个子密钥 */
DES_ROL(temp,MOVE_TIMES[cnt]);/* 循环左移 */
DES_PC2_Transform(temp,subKeys[cnt]);/* PC2置换,产生子密钥 */
}
return 0;
}
/* 密钥置换1 */
int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]){
int cnt;
for(cnt = 0; cnt < 56; cnt++){
tempbts[cnt] = key[PC_1[cnt]];
}
return 0;
}
/* 密钥置换2 */
int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]){
int cnt;
for(cnt = 0; cnt < 48; cnt++){
tempbts[cnt] = key[PC_2[cnt]];
}
return 0;
}
/* 循环左移 */
int DES_ROL(ElemType data[56], int time){
ElemType temp[56];
/* 保存将要循环移动到右边的位 */
memcpy(temp,data,time);
memcpy(temp+time,data+28,time);
/* 前28位移动 */
memcpy(data,data+time,28-time);
memcpy(data+28-time,temp,time);
/* 后28位移动 */
memcpy(data+28,data+28+time,28-time);
memcpy(data+56-time,temp+time,time);
return 0;
}
/* IP置换 */
int DES_IP_Transform(ElemType data[64]){
int cnt;
ElemType temp[64];
for(cnt = 0; cnt < 64; cnt++){
temp[cnt] = data[IP_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
/* IP逆置换 */
int DES_IP_1_Transform(ElemType data[64]){
int cnt;
ElemType temp[64];
for(cnt = 0; cnt < 64; cnt++){
temp[cnt] = data[IP_1_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
/* 扩展置换 */
int DES_E_Transform(ElemType data[48]){
int cnt;
ElemType temp[48];
for(cnt = 0; cnt < 48; cnt++){
temp[cnt] = data[E_Table[cnt]];
}
memcpy(data,temp,48);
return 0;
}
/* P置换 */
int DES_P_Transform(ElemType data[32]){
int cnt;
ElemType temp[32];
for(cnt = 0; cnt < 32; cnt++){
temp[cnt] = data[P_Table[cnt]];
}
memcpy(data,temp,32);
return 0;
}
/* 异或 */
int DES_XOR(ElemType R[48], ElemType L[48] ,int count){
int cnt;
for(cnt = 0; cnt < count; cnt++){
R[cnt] ^= L[cnt];
}
return 0;
}
/* S盒置换 */
int DES_SBOX(ElemType data[48]){
int cnt;
int line,row,output;
int cur1,cur2;
for(cnt = 0; cnt < 8; cnt++){
cur1 = cnt*6;
cur2 = cnt<<2;
/* 计算在S盒中的行与列 */
line = (data[cur1]<<1) + data[cur1+5];
row = (data[cur1+1]<<3) + (data[cur1+2]<<2)
+ (data[cur1+3]<<1) + data[cur1+4];
output = S[cnt][line][row];
/* 化为2进制 */
data[cur2] = (output&0X08)>>3;
data[cur2+1] = (output&0X04)>>2;
data[cur2+2] = (output&0X02)>>1;
data[cur2+3] = output&0x01;
}
return 0;
}
/* 交换 */
int DES_Swap(ElemType left[32], ElemType right[32]){
ElemType temp[32];
memcpy(temp,left,32);
memcpy(left,right,32);
memcpy(right,temp,32);
return 0;
}
/* 加密单个分组 */
int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]){
ElemType plainBits[64];
ElemType Right[48];
int cnt;
Char8ToBit64(plainBlock,plainBits);
/* 初始置换(IP置换) */
DES_IP_Transform(plainBits);
/* 16轮迭代 */
for(cnt = 0; cnt < 16; cnt++){
memcpy(Right,plainBits+32,32);
/* 将右半部分进行扩展置换,从32位扩展到48位 */
DES_E_Transform(Right);
/* 将右半部分与子密钥进行异或操作 */
DES_XOR(Right,subKeys[cnt],48);
/* 异或结果进入S盒,输出32位结果 */
DES_SBOX(Right);
/* P置换 */
DES_P_Transform(Right);
/* 将明文左半部分与右半部分进行异或 */
DES_XOR(plainBits,Right,32);
if(cnt != 15){
/* 最终完成左右部的交换 */
DES_Swap(plainBits,plainBits+32);
}
}
/* 逆初始置换(IP^1置换) */
DES_IP_1_Transform(plainBits);
Bit64ToChar8(plainBits,cipherBlock);
return 0;
}
/* 解密单个分组 */
int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48],ElemType plainBlock[8]){
ElemType cipherBits[64];
ElemType Right[48];
int cnt;
Char8ToBit64(cipherBlock,cipherBits);
/* 初始置换(IP置换) */
DES_IP_Transform(cipherBits);
/* 16轮迭代 */
for(cnt = 15; cnt >= 0; cnt--){
memcpy(Right,cipherBits+32,32);
/* 将右半部分进行扩展置换,从32位扩展到48位 */
DES_E_Transform(Right);
/* 将右半部分与子密钥进行异或操作 */
DES_XOR(Right,subKeys[cnt],48);
/* 异或结果进入S盒,输出32位结果 */
DES_SBOX(Right);
/* P置换 */
DES_P_Transform(Right);
/* 将明文左半部分与右半部分进行异或 */
DES_XOR(cipherBits,Right,32);
if(cnt != 0){
/* 最终完成左右部的交换 */
DES_Swap(cipherBits,cipherBits+32);
}
}
/* 逆初始置换(IP^1置换) */
DES_IP_1_Transform(cipherBits);
Bit64ToChar8(cipherBits,plainBlock);
return 0;
}
/* 加密文件 */
int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile){
FILE *plain,*cipher;
int count;
ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
ElemType bKey[64];
ElemType subKeys[16][48];
if((plain = fopen(plainFile,"rb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
if((cipher = fopen(cipherFile,"wb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
/* 设置密钥 */
memcpy(keyBlock,keyStr,8);
/* 将密钥转换为二进制流 */
Char8ToBit64(keyBlock,bKey);
/* 生成子密钥 */
DES_MakeSubKeys(bKey,subKeys);
while(!feof(plain)){
/* 每次读8个字节,并返回成功读取的字节数 */
if((count = fread(plainBlock,sizeof(char),8,plain)) == 8){
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
fwrite(cipherBlock,sizeof(char),8,cipher);
}
}
if(count){
/* 填充 */
memset(plainBlock + count,'\0',7 - count);
/* 最后一个字符保存包括最后一个字符在内的所填充的字符数量 */
plainBlock[7] = 8 - count;
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
fwrite(cipherBlock,sizeof(char),8,cipher);
}
fclose(plain);
fclose(cipher);
return OK;
}
/* 解密文件 */
int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile){
FILE *plain, *cipher;
int count,times = 0;
long fileLen;
ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
ElemType bKey[64];
ElemType subKeys[16][48];
if((cipher = fopen(cipherFile,"rb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
if((plain = fopen(plainFile,"wb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
/* 设置密钥 */
memcpy(keyBlock,keyStr,8);
/* 将密钥转换为二进制流 */
Char8ToBit64(keyBlock,bKey);
/* 生成子密钥 */
DES_MakeSubKeys(bKey,subKeys);
/* 取文件长度 */
fseek(cipher,0,SEEK_END); /* 将文件指针置尾 */
fileLen = ftell(cipher); /* 取文件指针当前位置 */
rewind(cipher); /* 将文件指针重指向文件头 */
while(1){
/* 密文的字节数一定是8的整数倍 */
fread(cipherBlock,sizeof(char),8,cipher);
DES_DecryptBlock(cipherBlock,subKeys,plainBlock);
times += 8;
if(times < fileLen){
fwrite(plainBlock,sizeof(char),8,plain);
}
else{
break;
}
}
/* 判断末尾是否被填充 */
if(plainBlock[7] < 8){
for(count = 8 - plainBlock[7]; count < 7; count++){
if(plainBlock[count] != '\0'){
break;
}
}
}
if(count == 7){/* 有填充 */
fwrite(plainBlock,sizeof(char),8 - plainBlock[7],plain);
}
else{/* 无填充 */
fwrite(plainBlock,sizeof(char),8,plain);
}
fclose(plain);
fclose(cipher);
return OK;
}
int main()
{ DES_Encrypt("1.txt","key.txt","2.txt");
system("pause");
DES_Decrypt("2.txt","key.txt","3.txt");
getchar();
return 0;
}
㈡ 编写函数完成字符串的加密与解密(c语言)
C语言代码和运行结果如下:
输出符合示例,加解密均正确,望采纳~
附源码链接:字符串加解密
㈢ c语言编写的程序,在输入密码时,如何加密
加密和解密算法是程序编制中的重要一环。试想,如果我们平时使用的腾讯QQ、支付宝支付密码、今日头条账号密码那么轻易就被别人盗取的话,很多不可以预料的事情就会发生!
在现实生活中,我们遇到过太多QQ密码被盗取的情况,有的朋友QQ被盗之后,骗子利用朋友间信任骗取钱财的事情屡见不鲜。支付宝也曾出现过支付宝账户被恶意盗取的事件,对用户利益造成了严重损害!这些在技术上都指向了同一相关问题:软件加密算法的强壮程度。今天,小编利用C语言来简单实现一种加密方法。下面是源代码。
需要说明:程序利用了ascii码值的按照一定规律变换实现加密,对于解密过程,则是加密的逆过程。下面是程序的运行结果。
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㈣ 如何给c/c++源代码加密
#include#include#includevoid findKey(char* key, char* mark){int len = strlen(key);int i = 0;int j = 0;memset(mark,0,26);for (i = 0; i 96){encrypt[i] = map[encrypt[i] - 97];}}outputFile = fopen("output.txt", "w+");fwrite(encrypt,nFileLen,1,outputFile);printf("加密的密文:%s\n", encrypt);fclose(outputFile);fclose(inputFile);free(encrypt);system("pause");return 0;}
㈤ C语言设计一个简单的加密解密程序
C语言设计一个简单的加密解密程序如下:
加密程序代码:
#include<stdio.h>
main()
{
char
c,filename[20];
FILE
*fp1,*fp2;
printf("请输入待加密的文件名:\n");
scanf("%s",filename);
fp1=fopen(filename,"r");
fp2=fopen("miwen.txt","w");
do
{
c=fgetc(fp1);
if(c>=32&&c<=126)
{
c=c-32;
c=126-c;
}
if(c!=-1)
fprintf(fp2,"%c",c);
}
while(c!=-1);
}
解密程序代码:
#include<stdio.h>
#include<string.h>
main()
{
char
c,filename[20];
char
yanzhengma[20];
FILE
*fp1,*fp2;
printf("请输入待解密文件名:\n");
scanf("%s",filename);
printf("请输入验证码:\n");
scanf("%s",yanzhengma);
if(strcmp(yanzhengma,"shan")==0)
{
fp1=fopen(filename,"r");
fp2=fopen("yuanwen.txt","w");
do
{
c=fgetc(fp1);
if(c>=32&&c<=126)
{
c=126-c;
c=32+c;
}
if(c!=-1)
fprintf(fp2,"%c",c);
}
while(c!=-1);
}
else
{
printf("验证码错误!请重新输入:\n");
scanf("%s",filename);
}
}
㈥ c语言文件加密和解密
c语言文件加密和解密方法如下:
1、首先打开VC++6.0;
voidDecryptFile(FILE*sfp,FILE*dfp,charpwd)
{
charch;
while((ch=fgetc(sfp))!=EOF)
{
if((ch>='a')&&(ch<='z'))
{
ch=ch^pwd;
ch=(ch-'a'+25)%26+'a';
}
if((ch>='A')&&(ch<='Z'))
{
ch=ch^pwd;
ch=(ch-'A'+25)%26+'A';
}
fputc(ch,dfp);
}
}
输出函数,输出文件内容
voidOutputFile(FILE*fp)
{
charch;
while((ch=fgetc(fp))!=EOF)
putchar(ch);
}
主函数,主要调用这几个函数
intmain()
{
/*用户输入的要加密的文件名*/
charsfilename[20];
/*用户输入加密后保存的文件名*/
chardfilename[20];
/*用来保存密码字符*/
charpwd;
FILE*sfp,*dfp;
printf(":
");
/*得到要加密的文件名*/
gets(sfilename);
/*得到加密后你要的文件名*/
printf(":
");
gets(dfilename);
/*得到加密字符*/
printf("PleaseinputyourPassword:
");
//scanf("%c",&pwd);
pwd=getch();
/*屏幕以*来表示输入的加密字符*/
printf("*
");
/*以只读方式打开要加密的文件*/
if((sfp=fopen(sfilename,"r"))==0)
{
printf("Can'topenthefile:%s
",sfilename);
exit(0);
}
/*输出要加密的文件*/
printf(":
");
OutputFile(sfp);
/*建立加密后的文件*/
if((dfp=fopen(dfilename,"w+"))==0)
{
printf("Can'topenorcreatethefile:%s
",dfilename);
//exit(0);
}
/*文件加密*/
fseek(sfp,0L,SEEK_SET);
EncryptFile(sfp,dfp,pwd);
printf("
Encryptedthefilesuccessfully!
");
/*输出加密后的文件*/
printf(":
");
fseek(dfp,0L,SEEK_SET);
OutputFile(dfp);
fclose(sfp);
fclose(dfp);
getch();
return0;
}
㈦ C语言编程代码加密
例如:简单的移位加密可以这样
FILE*fp=fopen("test.txt","r");
FILE*fp1=fopen("new.txt","w");
while((c=fgetc(fp))!=EOF)
fputc(c+1,fp1);//逐个读取全部字符,ASCII值+1并保存到另一个文件
然后可以remove("test.txt");//删除文件
或者读取new.txt再写回test.txt
解密就是ASCII值-1
㈧ c语言实现密码加密
unsignedchar*encrypt(unsignedchar*psw,intenc){
intsum=0,i;
if(enc){
for(i=0;i<6;i++){
psw[i]-=15;
sum+=psw[i];
}
psw[6]=(unsignedchar)sum;
psw[7]=0;
}
else{
for(i=0;i<6;i++){
sum+=psw[i];
psw[i]+=15;
}
if((unsignedchar)sum!=psw[6]){
printf("Badpassword ");
psw[0]=0;
returnpsw;
}
else{
psw[6]=0;
}
}
for(i=0;i<3;i++){
unsignedchart=psw[i];
psw[i]=psw[5-i];
psw[5-i]=t;
}
returnpsw;
}
intmain()
{
unsignedcharpsw[128];
scanf("%s",psw);
printf("encodeto:%s ",encrypt(psw,1));
printf("decodeto:%s ",encrypt(psw,0));
return0;
}
㈨ 公司C源码怎样进行加密
公司电子表格加密用上海迅软信息科技有限公司的加密软件。
首先选中客户端电脑上的单个文件、多个文件或文件夹右键菜单“DSE迅软数据安全->“手动加密”
选中客户端右下角图标,右键菜单“业务申请”->“手动加密”
通过以上两种方式,点击“手动加密”即可弹出手动加密界面
通过“增加文件”按钮可以增加多个文件,“增加目录”按钮可以增加整个文件夹下的所有文件。
需要处理文件后缀名输入框,输入后缀名,点击“过滤文件”可以将不需要处理
的文件过滤掉,例如,加密文件列表中同时包含.doc,.xls,.pdf,的多个文件,
在需要处理文件后缀输入框中输入doc,点“过滤文件”,过滤完以后,需要加
密的文件列表中只有.doc的文件,xls和pdf的文件都被过滤掉了。
加密文件的密级可以自定义,选择“高”,文件手动加密以后密级就为高,选择
好密级,点击“开始”即开始执行手动加密操作,操作完成以后会弹出完成的提
示,并提示,加密成功几个,失败几个。