From 3299d14d27e7626e5b14bfb448e2b7b73070ba71 Mon Sep 17 00:00:00 2001
From: Qifan Tang <q.tang2@student.unimelb.edu.au>
Date: Sat, 25 May 2019 13:03:16 +0000
Subject: [PATCH] uploading dh.c before 12
---
dh | Bin 0 -> 13400 bytes
dh.c | 175 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 175 insertions(+)
create mode 100755 dh
create mode 100644 dh.c
diff --git a/dh b/dh
new file mode 100755
index 0000000000000000000000000000000000000000..0e61a2db2ab954d5d41e77fde088708749be237f
GIT binary patch
literal 13400
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diff --git a/dh.c b/dh.c
new file mode 100644
index 0000000..561249f
--- /dev/null
+++ b/dh.c
@@ -0,0 +1,175 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <strings.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <ctype.h>
+#define G 15
+#define P 97
+
+
+
+//used this instead of the power, but not sure why
+int calculate(int g, int m, int p)
+{
+ int r;
+ int y = 1;
+ while (m > 0){
+ r = m % 2;
+ // fast exponention
+ if (r == 1)
+ y = (y*g) % p;
+ g = g*g % p;
+ m = m / 2;
+ }
+ return y;
+}
+
+//to calculate the hex value
+int toInt(char a){
+ if(isalpha(a)){
+ a = a - 87;
+ }else{
+ a = a - 48;
+ }
+ return (int) a;
+}
+
+int main(int argc, char ** argv)
+{
+ char buffer[256];
+ //get the sha256 file
+ FILE* file = popen("openssl sha256 dh.c", "r");
+ if(!file){
+ printf("something wrong with your command or file\n");
+ exit(0);
+ }
+
+ while(fgets(buffer, 256, file)){
+
+ }
+
+ pclose(file);
+ //copy the file
+ //printf("buffer = %s\n", buffer);
+
+ char hashed[256];
+ strcpy(hashed, buffer);
+
+ //convert to integer
+ int hex1 = toInt(hashed[14]);
+ int hex2 = toInt(hashed[15]);
+ //printf("%d\n", hex1);
+ //printf("%d\n", hex2);
+ //this b is for the one to calculate
+ int b = hex1 * 16 + hex2;
+ //printf("b = %d\n", b);
+ //calculate the one to send
+ int B = calculate(G, b, P);
+ printf("B = %d\n", B);
+
+
+
+ //time to establish connection
+ int sockfd, portno, n;
+ struct sockaddr_in serv_addr;
+ struct hostent * server;
+
+ portno = 7800;
+
+
+ /* Translate host name into peer's IP address ;
+ * This is name translation service by the operating system
+ */
+ server = gethostbyname("172.26.37.44");
+
+ if (server == NULL)
+ {
+ fprintf(stderr, "ERROR, no such host\n");
+ exit(0);
+ }
+
+ /* Building data structures for socket */
+
+ bzero((char *)&serv_addr, sizeof(serv_addr));
+
+ serv_addr.sin_family = AF_INET;
+
+ bcopy(server->h_addr_list[0], (char *)&serv_addr.sin_addr.s_addr, server->h_length);
+
+ serv_addr.sin_port = htons(portno);
+
+ /* Create TCP socket -- active open
+ * Preliminary steps: Setup: creation of active open socket
+ */
+
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+
+ if (sockfd < 0)
+ {
+ perror("ERROR opening socket");
+ exit(0);
+ }
+
+ if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
+ {
+ perror("ERROR connecting");
+ exit(0);
+ }
+ printf("successfully creat socket\n");
+
+ bzero(buffer, 256);
+
+ //send name
+ strcpy(buffer, "qifant\n");
+ n = write(sockfd, buffer, strlen(buffer));
+ printf("successfully sent name\n");
+
+ //send the value of B
+ bzero(buffer, 256);
+ //put integer B into into buffer
+ sprintf(buffer, "%d\n", B);
+ n = write(sockfd,buffer, strlen(buffer));
+ printf("successfully sent B\n");
+
+ bzero(buffer, 256);
+ //wait for the response
+ n = read(sockfd, buffer, 255);
+
+ if (n < 0){
+ perror("ERROR reading from socket");
+ exit(0);
+ }
+
+ //should receive a int
+ int receive = atoi(buffer);
+ //printf("receive = %d\n",receive);
+ printf("successfully received");
+
+ int key = calculate(receive, b, P);
+ //printf("key = %d\n", key);
+
+ bzero(buffer, 256);
+
+ //confirm the key
+ sprintf(buffer, "%d\n", key);
+ n = write(sockfd, buffer, strlen(buffer));
+ bzero(buffer, 256);
+
+ //receive the result
+ n = read(sockfd, buffer, 255);
+ if (n < 0){
+ perror("ERROR reading from socket");
+ exit(0);
+ }
+
+ printf("result: %s\n", buffer);
+
+
+}
+
--
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