在linux操作系統了，寫了一個C語言的網絡文件傳輸，基於TCP/IP協議，同時加了MD5校驗
客戶端client.c
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "md5.h"
#define MAXLINE 4096
#define MD5_SIZE 16
#define MD5_STR_LEN (MD5_SIZE * 2)
#define WAIT_COUNT 16
typedef struct
{
int flag;
int length;
char data[MAXLINE];
}send_buffer;
int Compute_file_md5(const char *file_path, char *md5_str);
char* find_file_name(char *name);
void usage(char *command)
{
printf("usage :%s ipaddr portnum filename1 filename2 filename3 ...filenameN\n", command);
exit(0);
}
int main(int argc,char **argv)
{
struct sockaddr_in serv_addr;
send_buffer s_data;
int sock_id;
int read_len;
int send_len;
int i_ret;
int num;
int ttmp;
int send_state;
char md5_str[MD5_STR_LEN];
char *file_name;
FILE *fp;
if (argc < 4)
{
usage(argv[0]);
}
for(num=3;num<argc;num++)
{
if(access(argv[num],F_OK | R_OK)==-1) //判斷文件是否存在以及是否可讀
{
perror("check file Failed");
printf("check file: %s ---Failed\n",argv[num]);
exit(0);
}
printf("check file: %s ---OK\n",argv[num]);
}
if ((sock_id = socket(AF_INET,SOCK_STREAM,0)) < 0)
{
perror("Create socket failed\n");
exit(0);
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(atoi(argv[2]));
inet_pton(AF_INET, argv[1], &serv_addr.sin_addr);
i_ret = connect(sock_id, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr));
if (-1 == i_ret)
{
printf("Connect socket failed\n");
return -1;
}
send_state=1;
for(num=3;(num<argc) && (send_state==1);num++) //循環依次發送文件
{
if(send_state==1)
{
bzero(&s_data, sizeof(s_data));
s_data.flag=1;
bzero(md5_str, MD5_STR_LEN);
if(Compute_file_md5(argv[num], md5_str)!=0)
{
perror("compute md5 value failed\n");
close(sock_id);
send_state=0;
}
strncpy(s_data.data,md5_str,MD5_STR_LEN);
file_name=find_file_name(argv[num]);
s_data.length=strlen(argv[num])-((file_name-argv[num])/sizeof(char));
strncpy(s_data.data+32,file_name,s_data.length);
s_data.length=s_data.length+MD5_STR_LEN;
send_len = send(sock_id, &s_data, sizeof(s_data), 0);
if ( send_len < 0 )
{
perror("Send file name and md5 failed\n");
close(sock_id);
send_state=0;
}
}
if(send_state==1)
{
for(ttmp=0;ttmp<WAIT_COUNT;ttmp++)
{
bzero(&s_data, sizeof(s_data));
read_len = recv(sock_id, &s_data, sizeof(s_data), 0);
if(read_len < 0)
{
perror("Recieve Data From Server Failed!\n");
close(sock_id);
send_state=0;
break;
}
if(s_data.flag==1)
{
printf("file name and md5 reply OK\n");
break;
}
}
if(ttmp>=WAIT_COUNT)
{
perror("file name and md5 reply Failed!\n");
close(sock_id);
send_state=0;
}
}
if(send_state==1)
{
if ((fp = fopen(argv[num],"rb")) == NULL)
{
perror("Open file failed\n");
close(sock_id);
send_state=0;
}
}
if(send_state==1)
{
bzero(&s_data, sizeof(s_data));
while ((read_len = fread(&s_data.data, sizeof(char), MAXLINE, fp)) >0 )
{
s_data.flag=3;
s_data.length=read_len;
send_len = send(sock_id, &s_data, sizeof(s_data), 0);
if ( send_len < 0 )
{
perror("Send file failed\n");
fclose(fp);
close(sock_id);
send_state=0;
break;
}
read_len = recv(sock_id, &s_data, sizeof(s_data), 0);
if(read_len < 0)
{
perror("Recieve Data From Server Failed!\n");
close(sock_id);
send_state=0;
break;
}
else
{
if(s_data.flag!=3)
{
send_state=0;
break;
}
}
bzero(&s_data, sizeof(s_data));
}
if(send_state==1)
{
fclose(fp);
}
}
if(send_state==1)
{
bzero(&s_data, sizeof(s_data));
s_data.flag=-3;
s_data.length=0;
send_len = send(sock_id, &s_data, sizeof(s_data), 0);
if ( send_len < 0 )
{
perror("Send file failed\n");
close(sock_id);
send_state=0;
}
}
if(send_state==1)
{
for(ttmp=0;ttmp<WAIT_COUNT;ttmp++)
{
bzero(&s_data, sizeof(s_data));
read_len = recv(sock_id, &s_data, sizeof(s_data), 0);
if(read_len < 0)
{
perror("Recieve Data From Server Failed!\n");
close(sock_id);
send_state=0;
}
if(s_data.flag==2)
{
printf("md5 verify OK\n");
break;
}
else if(s_data.flag==-2)
{
ttmp=WAIT_COUNT;
}
}
if(ttmp>=WAIT_COUNT)
{
perror("md5 verify Failed!\n");
close(sock_id);
send_state=0;
}
else
{
printf("send filename %s ---OK\n",argv[num]);
}
}
}
if(send_state==1)
{
close(sock_id);
printf("finish transport files\n");
}
else
{
perror("transport error\n");
}
return 0;
}
/**
* compute the md5 value of a file
* @param file_path
* @param md5_str
* @return 0: ok, -1: fail
*/
int Compute_file_md5(const char *file_path, char *md5_str)
{
int i;
int fd;
int ret;
unsigned char data[MAXLINE];
unsigned char md5_value[MD5_SIZE];
MD5_CTX md5;
fd = open(file_path, O_RDONLY);
if (-1 == fd)
{
perror("open");
return -1;
}
// init md5
MD5Init(&md5);
while (1)
{
ret = read(fd, data, MAXLINE);
if (-1 == ret)
{
perror("read");
close(fd);
return -1;
}
MD5Update(&md5, data, ret);
if (0 == ret || ret < MAXLINE)
{
break;
}
}
close(fd);
MD5Final(&md5, md5_value);
// convert md5 value to md5 string
for(i = 0; i < MD5_SIZE; i++)
{
snprintf(md5_str + i*2, 2+1, "%02x", md5_value[i]);
}
return 0;
}
char* find_file_name(char *name)
{
char *name_start = NULL;
int sep = '/';
if (NULL == name)
{
printf("the path name is NULL\n");
return NULL;
}
name_start = strrchr(name, sep);
return (NULL == name_start)? name : (name_start + 1);
}
服務端server.c
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "md5.h"
#define MAXLINE 4096
#define MD5_SIZE 16
#define MD5_STR_LEN (MD5_SIZE * 2)
typedef struct
{
int flag; //標誌
int length; //數據長度
char data[MAXLINE]; //數據
}recv_buffer;
int Compute_file_md5(const char *file_path, char *md5_str);
/**
* print the command description
* @param command
* @return void
*/
void usage(char *command)
{
printf("usage :%s portnum dir\n", command);
exit(0);
}
/**
* main func
* @param argc
* @param argv
* @return 0: ok, other: fail
*/
int main(int argc,char **argv)
{
struct sockaddr_in serv_addr;
struct sockaddr_in clie_addr;
recv_buffer r_data;
char file_name[MAXLINE];
char md5_str[MD5_STR_LEN];
char md5_compute[MD5_STR_LEN];
int sock_id;
int link_id;
int clie_addr_len;
int recv_len;
int write_leng;
int get_filename_flag;
int get_md5_flag;
int connect_flag;
int ttp;
FILE *fp;
if (argc != 3)
{
usage(argv[0]);
}
if(access(argv[2],F_OK)==-1)
{
perror("check dir Failed");
printf("check dir: %s ---Failed\n",argv[2]);
exit(0);
}
if ((sock_id = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("Create socket failed\n");
exit(0);
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(atoi(argv[1]));
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(sock_id, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0 )
{
perror("Bind socket failed\n");
close(sock_id);
exit(0);
}
if (-1 == listen(sock_id, 10))
{
perror("Listen socket failed\n");
close(sock_id);
exit(0);
}
while (1)
{
connect_flag=0;
clie_addr_len = sizeof(clie_addr);
link_id = accept(sock_id, (struct sockaddr *)&clie_addr, (socklen_t *)&clie_addr_len);
if (-1 == link_id)
{
perror("Accept socket failed\n");
close(sock_id);
exit(0);
}
connect_flag=1;
bzero(&r_data, sizeof(r_data));
get_filename_flag=0;
get_md5_flag=0;
while ((recv_len = recv(link_id, &r_data, sizeof(r_data), 0))>0)
{
if(recv_len < 0)
{
printf("Recieve Data From client Failed!\n");
break;
}
/*r_data.flag : flag description
* 1 : file name or open file ok
* -1 : open file failed
* 3 : file content
* -3 : file end
* 0 : unknow flag
*/
switch (r_data.flag)
{
case 0:
break;
case 1: //recv filename
if(get_filename_flag==0)
{
bzero(md5_str, MD5_STR_LEN);
strncpy(md5_str,r_data.data,MD5_STR_LEN);
bzero(file_name, MAXLINE);
strncpy(file_name,argv[2],strlen(argv[2])); //拷貝目錄
strcat(file_name,"/");
r_data.data[r_data.length]='\0';
strcat(file_name,r_data.data+MD5_STR_LEN); //拷貝文件名
printf("begin recv file: %s\n...\n",file_name);
if ((fp = fopen(file_name, "wb")) == NULL) //二進制模式寫入
{
perror("Open file failed\n");
bzero(&r_data, sizeof(r_data));
r_data.flag=-1; //發送文件打開失敗reply，不能傳輸文件內容
r_data.length=0;
recv_len = send(link_id, &r_data, sizeof(r_data), 0);
if ( recv_len < 0 )
{
perror("Send file failed\n");
close(link_id);
connect_flag=0;
}
get_filename_flag=0;
get_md5_flag=0;
}
else
{
bzero(&r_data, sizeof(r_data));
r_data.flag=1; //發送文件打開成功reply，可以傳輸文件內容
r_data.length=0;
recv_len = send(link_id, &r_data, sizeof(r_data), 0);
if ( recv_len < 0 )
{
perror("Send file failed\n");
close(link_id);
connect_flag=0;
}
get_filename_flag=1;
get_md5_flag=1;
}
}
break;
case 3: //recv file content
if((get_filename_flag==1) && (get_md5_flag==1))
{
write_leng = fwrite(r_data.data, sizeof(char), r_data.length, fp); //將接收到的數據寫入到文件中去
if (write_leng < r_data.length)
{
perror("Write file conntent failed\n");
r_data.flag=-3; //發送md5校驗失敗reply
r_data.length=0;
recv_len = send(link_id, &r_data, sizeof(r_data), 0);
if ( recv_len < 0 )
{
perror("Send file failed\n");
close(link_id);
connect_flag=0;
}
else
{
close(link_id);
connect_flag=0;
}
}
else
{
r_data.flag=3; //發送md5校驗失敗reply
r_data.length=0;
recv_len = send(link_id, &r_data, sizeof(r_data), 0);
if ( recv_len < 0 )
{
perror("Send file failed\n");
close(link_id);
connect_flag=0;
}
}
}
break;
case -3: //recv file end
if((get_filename_flag==1) && (get_md5_flag==1))
{
fclose(fp);
bzero(md5_compute, MD5_STR_LEN);
if(Compute_file_md5(file_name, md5_compute)!=0)
{
perror("compute md5 value failed\n");
bzero(&r_data, sizeof(r_data));
r_data.flag=-2; //發送md5校驗失敗reply
r_data.length=0;
recv_len = send(link_id, &r_data, sizeof(r_data), 0);
if ( recv_len < 0 )
{
perror("Send reply failed\n");
close(link_id);
connect_flag=0;
}
close(link_id);
connect_flag=0;
}
ttp=strncmp(md5_compute, md5_str, MD5_STR_LEN);
if(ttp==0)
{
bzero(&r_data, sizeof(r_data));
r_data.flag=2; //發送md5校驗成功reply
r_data.length=0;
printf("recv file OK\n\n");
recv_len = send(link_id, &r_data, sizeof(r_data), 0);
if ( recv_len < 0 )
{
perror("Send reply failed\n");
close(link_id);
connect_flag=0;
}
}
else
{
bzero(&r_data, sizeof(r_data));
r_data.flag=-2; //發送md5校驗失敗reply
r_data.length=0;
recv_len = send(link_id, &r_data, sizeof(r_data), 0);
if ( recv_len < 0 )
{
perror("Send reply failed\n");
close(link_id);
connect_flag=0;
}
}
get_filename_flag=0;
get_md5_flag=0;
}
break;
default: // unknow flag
bzero(&r_data, sizeof(r_data));
r_data.flag=-11;
r_data.length=65535;
recv_len = send(link_id, &r_data, sizeof(r_data), 0);
if ( recv_len < 0 )
{
perror("Send reply failed\n");
close(link_id);
connect_flag=0;
}
break;
}
bzero(&r_data,sizeof(r_data));
if(connect_flag==0)
{
break;
}
}
printf("\nFinish Recieve......\n");
if(connect_flag==1)
{
close(link_id);
}
}
close(sock_id);
return 0;
}
/**
* compute the md5 value of a file
* @param file_path
* @param md5_str
* @return 0: ok, -1: fail
*/
int Compute_file_md5(const char *file_path, char *md5_str)
{
int i;
int fd;
int ret;
unsigned char data[MAXLINE];
unsigned char md5_value[MD5_SIZE];
MD5_CTX md5;
fd = open(file_path, O_RDONLY);
if (-1 == fd)
{
perror("open");
return -1;
}
// init md5
MD5Init(&md5);
while (1)
{
ret = read(fd, data, MAXLINE);
if (-1 == ret)
{
perror("read");
close(fd);
return -1;
}
MD5Update(&md5, data, ret);
if (0 == ret || ret < MAXLINE)
{
break;
}
}
close(fd);
MD5Final(&md5, md5_value);
// convert md5 value to md5 string
for(i = 0; i < MD5_SIZE; i++)
{
snprintf(md5_str + i*2, 2+1, "%02x", md5_value[i]);
}
return 0;
}
md5.c
#include "md5.h"
#include <memory.h>
unsigned char PADDING[] =
{
0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
void MD5Init(MD5_CTX *context)
{
context->count[0] = 0;
context->count[1] = 0;
context->state[0] = 0x67452301;
context->state[1] = 0xEFCDAB89;
context->state[2] = 0x98BADCFE;
context->state[3] = 0x10325476;
}
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen)
{
unsigned int i = 0;
unsigned int index = 0;
unsigned int partlen = 0;
index = (context->count[0] >> 3) & 0x3F;
partlen = 64 - index;
context->count[0] += inputlen << 3;
if(context->count[0] < (inputlen << 3))
context->count[1]++;
context->count[1] += inputlen >> 29;
if(inputlen >= partlen)
{
memcpy(&context->buffer[index], input,partlen);
MD5Transform(context->state, context->buffer);
for(i = partlen; i+64 <= inputlen; i+=64)
MD5Transform(context->state, &input[i]);
index = 0;
}
else
{
i = 0;
}
memcpy(&context->buffer[index], &input[i], inputlen-i);
}
void MD5Final(MD5_CTX *context, unsigned char digest[16])
{
unsigned int index = 0,padlen = 0;
unsigned char bits[8];
index = (context->count[0] >> 3) & 0x3F;
padlen = (index < 56)?(56-index):(120-index);
MD5Encode(bits, context->count, 8);
MD5Update(context, PADDING, padlen);
MD5Update(context, bits, 8);
MD5Encode(digest, context->state, 16);
}
void MD5Encode(unsigned char *output,unsigned int *input,unsigned int len)
{
unsigned int i = 0;
unsigned int j = 0;
while(j < len)
{
output[j] = input[i] & 0xFF;
output[j+1] = (input[i] >> 8) & 0xFF;
output[j+2] = (input[i] >> 16) & 0xFF;
output[j+3] = (input[i] >> 24) & 0xFF;
i++;
j += 4;
}
}
void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len)
{
unsigned int i = 0;
unsigned int j = 0;
while(j < len)
{
output[i] = (input[j]) |
(input[j+1] << 8) |
(input[j+2] << 16) |
(input[j+3] << 24);
i++;
j += 4;
}
}
void MD5Transform(unsigned int state[4], unsigned char block[64])
{
unsigned int a = state[0];
unsigned int b = state[1];
unsigned int c = state[2];
unsigned int d = state[3];
unsigned int x[64];
MD5Decode(x,block,64);
FF(a, b, c, d, x[ 0], 7, 0xd76aa478); /* 1 */
FF(d, a, b, c, x[ 1], 12, 0xe8c7b756); /* 2 */
FF(c, d, a, b, x[ 2], 17, 0x242070db); /* 3 */
FF(b, c, d, a, x[ 3], 22, 0xc1bdceee); /* 4 */
FF(a, b, c, d, x[ 4], 7, 0xf57c0faf); /* 5 */
FF(d, a, b, c, x[ 5], 12, 0x4787c62a); /* 6 */
FF(c, d, a, b, x[ 6], 17, 0xa8304613); /* 7 */
FF(b, c, d, a, x[ 7], 22, 0xfd469501); /* 8 */
FF(a, b, c, d, x[ 8], 7, 0x698098d8); /* 9 */
FF(d, a, b, c, x[ 9], 12, 0x8b44f7af); /* 10 */
FF(c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */
FF(b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */
FF(a, b, c, d, x[12], 7, 0x6b901122); /* 13 */
FF(d, a, b, c, x[13], 12, 0xfd987193); /* 14 */
FF(c, d, a, b, x[14], 17, 0xa679438e); /* 15 */
FF(b, c, d, a, x[15], 22, 0x49b40821); /* 16 */
/* Round 2 */
GG(a, b, c, d, x[ 1], 5, 0xf61e2562); /* 17 */
GG(d, a, b, c, x[ 6], 9, 0xc040b340); /* 18 */
GG(c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */
GG(b, c, d, a, x[ 0], 20, 0xe9b6c7aa); /* 20 */
GG(a, b, c, d, x[ 5], 5, 0xd62f105d); /* 21 */
GG(d, a, b, c, x[10], 9, 0x2441453); /* 22 */
GG(c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */
GG(b, c, d, a, x[ 4], 20, 0xe7d3fbc8); /* 24 */
GG(a, b, c, d, x[ 9], 5, 0x21e1cde6); /* 25 */
GG(d, a, b, c, x[14], 9, 0xc33707d6); /* 26 */
GG(c, d, a, b, x[ 3], 14, 0xf4d50d87); /* 27 */
GG(b, c, d, a, x[ 8], 20, 0x455a14ed); /* 28 */
GG(a, b, c, d, x[13], 5, 0xa9e3e905); /* 29 */
GG(d, a, b, c, x[ 2], 9, 0xfcefa3f8); /* 30 */
GG(c, d, a, b, x[ 7], 14, 0x676f02d9); /* 31 */
GG(b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 */
/* Round 3 */
HH(a, b, c, d, x[ 5], 4, 0xfffa3942); /* 33 */
HH(d, a, b, c, x[ 8], 11, 0x8771f681); /* 34 */
HH(c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */
HH(b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */
HH(a, b, c, d, x[ 1], 4, 0xa4beea44); /* 37 */
HH(d, a, b, c, x[ 4], 11, 0x4bdecfa9); /* 38 */
HH(c, d, a, b, x[ 7], 16, 0xf6bb4b60); /* 39 */
HH(b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */
HH(a, b, c, d, x[13], 4, 0x289b7ec6); /* 41 */
HH(d, a, b, c, x[ 0], 11, 0xeaa127fa); /* 42 */
HH(c, d, a, b, x[ 3], 16, 0xd4ef3085); /* 43 */
HH(b, c, d, a, x[ 6], 23, 0x4881d05); /* 44 */
HH(a, b, c, d, x[ 9], 4, 0xd9d4d039); /* 45 */
HH(d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */
HH(c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */
HH(b, c, d, a, x[ 2], 23, 0xc4ac5665); /* 48 */
/* Round 4 */
II(a, b, c, d, x[ 0], 6, 0xf4292244); /* 49 */
II(d, a, b, c, x[ 7], 10, 0x432aff97); /* 50 */
II(c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */
II(b, c, d, a, x[ 5], 21, 0xfc93a039); /* 52 */
II(a, b, c, d, x[12], 6, 0x655b59c3); /* 53 */
II(d, a, b, c, x[ 3], 10, 0x8f0ccc92); /* 54 */
II(c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */
II(b, c, d, a, x[ 1], 21, 0x85845dd1); /* 56 */
II(a, b, c, d, x[ 8], 6, 0x6fa87e4f); /* 57 */
II(d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */
II(c, d, a, b, x[ 6], 15, 0xa3014314); /* 59 */
II(b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */
II(a, b, c, d, x[ 4], 6, 0xf7537e82); /* 61 */
II(d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */
II(c, d, a, b, x[ 2], 15, 0x2ad7d2bb); /* 63 */
II(b, c, d, a, x[ 9], 21, 0xeb86d391); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
md5.h
#ifndef MD5_H
#define MD5_H
typedef struct
{
unsigned int count[2];
unsigned int state[4];
unsigned char buffer[64];
} MD5_CTX;
#define F(x,y,z) ((x & y) | (~x & z))
#define G(x,y,z) ((x & z) | (y & ~z))
#define H(x,y,z) (x^y^z)
#define I(x,y,z) (y ^ (x | ~z))
#define ROTATE_LEFT(x,n) ((x << n) | (x >> (32-n)))
#define FF(a,b,c,d,x,s,ac) \
{ \
a += F(b,c,d) + x + ac; \
a = ROTATE_LEFT(a,s); \
a += b; \
}
#define GG(a,b,c,d,x,s,ac) \
{ \
a += G(b,c,d) + x + ac; \
a = ROTATE_LEFT(a,s); \
a += b; \
}
#define HH(a,b,c,d,x,s,ac) \
{ \
a += H(b,c,d) + x + ac; \
a = ROTATE_LEFT(a,s); \
a += b; \
}
#define II(a,b,c,d,x,s,ac) \
{ \
a += I(b,c,d) + x + ac; \
a = ROTATE_LEFT(a,s); \
a += b; \
}
void MD5Init(MD5_CTX *context);
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen);
void MD5Final(MD5_CTX *context, unsigned char digest[16]);
void MD5Transform(unsigned int state[4], unsigned char block[64]);
void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len);
void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len);
#endif
傳輸結果：
