From 07d1632976333c72c8d59742e32625fed5ce518d Mon Sep 17 00:00:00 2001
From: Xiaoxuan-Val <lixiaoxuan233@gmail.com>
Date: Fri, 24 May 2019 16:01:46 +1000
Subject: [PATCH] finally get dh.c XD
---
dh.c | 201 +++++++++++++++++++++++++++++++++++++++
hash.txt | 1 +
project2.c | 15 ++-
pwd6sha256 | Bin 0 -> 640 bytes
xiaoxuanl4@172.26.37.159 | 174 +++++++++++++++++++++++++++++++++
5 files changed, 390 insertions(+), 1 deletion(-)
create mode 100644 dh.c
create mode 100644 hash.txt
create mode 100644 pwd6sha256
create mode 100644 xiaoxuanl4@172.26.37.159
diff --git a/dh.c b/dh.c
new file mode 100644
index 0000000..d456d67
--- /dev/null
+++ b/dh.c
@@ -0,0 +1,201 @@
+/*socket programming part comes from comp30023 lab5 sample code.
+ credit to the person who write that sample code*/
+
+
+/* A simple client program for server.c
+
+ To compile: gcc client.c -o client
+
+ To run: start the server, then the client */
+
+#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>
+
+// Function to compute a^m mod n, comes from www.techiedelight.com
+int compute(int a, int m, int n)
+{
+ int r;
+ int y = 1;
+
+ while (m > 0)
+ {
+ r = m % 2;
+
+ // fast exponention
+ if (r == 1)
+ y = (y*a) % n;
+ a = a*a % n;
+
+ m = m / 2;
+ }
+
+ return y;
+}
+
+int main(int argc, char ** argv)
+{
+ int sockfd, portno, n;
+ struct sockaddr_in serv_addr;
+ struct hostent * server;
+
+ char buffer[256];
+
+ 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);
+ }
+
+ /* Do processing
+ */
+
+ //send user name
+
+ bzero(buffer, 256);
+
+ sprintf(buffer, "xiaoxuanl4\n");
+ n = write(sockfd, buffer, strlen(buffer));
+ printf("%s\n", buffer);
+
+ //send g^b(mod p)
+
+ int g=15;
+ int p=97;
+
+ bzero(buffer, 256);
+
+ char hash[256];
+ FILE* file = popen("openssl sha256 dh.c", "r");
+ if(!file){
+ printf("something wrong with your command or file\n");
+ exit(0);
+ }
+
+ while(fgets(hash, 256, file)){
+ strcat(buffer, hash);
+ bzero(hash, 256);
+ }
+ pclose(file);
+ printf("%s\n", buffer);
+
+ char res[256];
+
+ char* temp = malloc(3*sizeof(char*));
+
+ temp = strstr(buffer, "SHA256(dh.c)= ") + 14;
+ temp[2] = '\0';
+ printf("%s\n", temp);
+ strcpy(res, temp);
+
+ temp = NULL;
+ free(temp);
+
+ int b1 = 0;
+ int b2 = 0;
+ int b = 0;
+
+
+ if(isalpha(res[0])) {
+ //fix with alpha case
+ b1 = res[0] - 87;
+ } else {
+ //fix with integer case
+ b1 = res[0] - 48;
+ }
+ if(isalpha(res[1])) {
+ //fix with alpha case
+ b2 = res[1] - 87;
+ } else {
+ //fix with integer case
+ b2 = res[1] - 48;
+ }
+
+ b = (b1*16)+b2;
+
+ printf("%d\n", b);
+
+ bzero(buffer, 256);
+ bzero(res, 256);
+
+ //Assume I am Bob
+ int Bob_req = compute(g, b, p);
+
+ sprintf(buffer, "%d\n", Bob_req);
+ n = write(sockfd, buffer, strlen(buffer));
+ printf("%s\n", buffer);
+ if (n < 0)
+ {
+ perror("ERROR writing to socket");
+ exit(0);
+ }
+
+ bzero(buffer, 256);
+
+ n = read(sockfd, buffer, 255);
+ printf("%s\n", buffer);
+ if (n < 0)
+ {
+ perror("ERROR reading from socket");
+ exit(0);
+ }
+ //server is Alice
+ int Alice_res = atoi(buffer);
+ int Bob_res_again= compute(Alice_res, b, p);
+
+ bzero(buffer, 256);
+ sprintf(buffer, "%d\n", Bob_res_again);
+ n = write(sockfd, buffer, strlen(buffer));
+ printf("%s\n", buffer);
+ bzero(buffer, 256);
+
+ n = read(sockfd, buffer, 255);
+
+ printf("status report: %s\n", buffer);
+
+ return 0;
+}
diff --git a/hash.txt b/hash.txt
new file mode 100644
index 0000000..de80120
--- /dev/null
+++ b/hash.txt
@@ -0,0 +1 @@
+SHA256(dh.c)= e2ee2bf56359a4028d098efd16d996c11fedd74587356f82573f1b2f2029d0ea
diff --git a/project2.c b/project2.c
index 3070209..5527c63 100644
--- a/project2.c
+++ b/project2.c
@@ -40,7 +40,6 @@ int main(int argc, char* argv[]){
}
//one arguement scenario
-
if( argc == 2){
int count = atoi(argv[1]);
char guess[10];
@@ -58,9 +57,23 @@ int main(int argc, char* argv[]){
}
//two arguements scenarios
+ if( argc == 3){
+ FILE* test_file;
+ FILE* target_file;
+ test_file = fopen(argv[2],"r");
+ target_file = fopen(argv[3], "rb");
+
+ unsigned char target_harshes[10000][SHA256_BLOCK_SIZE];
+
+
+
+
+
+ }
+
return 0;
}
diff --git a/pwd6sha256 b/pwd6sha256
new file mode 100644
index 0000000000000000000000000000000000000000..e4b6da58e3fbe3eb7f1588d5352565c89d245481
GIT binary patch
literal 640
zcmZ2vDnGa3bKc&Eca-05yR`q%E03@Xt;ZDJ>~xuDxThlhzo1p=&t>blCCt-jII`|%
ztMrrlxxac*W@Oh{VXeA-H;O~kd6r)JVAR&yTjyM|SmVue&G1coJ0E<D@trQ)QL<g}
z)rkvDfsB^wi_KS8SI*Ku8GFIA=lS=8b9U)UF><l%*YAFROUO$5gz-bxnyCE_JN$!w
zT$^q(@&D3F^$8c9J*5l{1y^~sM3h=4%U3LV-PiT0M_h360efQuuSZ7u3;cU_`B}Vj
z*)Vg7=fu0V{O?~L`Y~7C{5?y@xetAu_o`LbD|8?HJW2CQy2h@&tE(DVue4d5YYeKj
z>pNw8Xn9`LnL80*H!bhkQhC%-IbLhROvUeQ`X8RWuz8?%ne|>>+TnJcp0?>5jiRM1
zi#V#97&`9uKjv)@ei*9uQ|X5Gx(T808Y9HHcV0L;TgjDOv*wy|UFw5v;_GY5wF0a&
z<xcQ>w|qG=b8mUa#M>|O?)BVOJ8|<!i{$mED=KR~M$Y-#_n4zT(5LE;c8;1~>9fW?
z{}_$+LjqPwZCT8~$|;k?wpps-*8fRyy!*B<%g<h{{B-Ftjev}uQU5~=876XFNtWFx
zdBvpT#G4qA%l!GX)#RhXQeO+{?%99iYJQ~0@;l~bn^r5oopS5<s$}2uyXNmrs(p4(
z&OrCKNy?2C@6+3vHgD3uA+}SlAVke7$bZpAsb&$6Kl|6rl@RFl@agAW)Om7dt<UAZ
zCl+q-sjfRcujqY1YFy3Mg1hGu8U+g`UMZ^86EI0Dw=sCO;(37I=l?13H+jD84mUmY
z;?DWwau*go`x6^;^kvJ5>+keVT}VjY`)k?rYeD=b1_!Tiv+s#8S#(~aFr;)R^J;}B
FsQ_c$LlFP~
literal 0
HcmV?d00001
diff --git a/xiaoxuanl4@172.26.37.159 b/xiaoxuanl4@172.26.37.159
new file mode 100644
index 0000000..0ac2528
--- /dev/null
+++ b/xiaoxuanl4@172.26.37.159
@@ -0,0 +1,174 @@
+/*socket programming part comes from comp30023 lab5 sample code.
+ credit to the person who write that sample code*/
+
+
+/* A simple client program for server.c
+
+ To compile: gcc client.c -o client
+
+ To run: start the server, then the client */
+
+#include <stdio.h>
+#include <stdlib.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>
+
+// Function to compute a^m mod n, comes from www.techiedelight.com
+int compute(int a, int m, int n)
+{
+ int r;
+ int y = 1;
+
+ while (m > 0)
+ {
+ r = m % 2;
+
+ // fast exponention
+ if (r == 1)
+ y = (y*a) % n;
+ a = a*a % n;
+
+ m = m / 2;
+ }
+
+ return y;
+}
+
+
+int main(int argc, char ** argv)
+{
+ int sockfd, portno, n;
+ struct sockaddr_in serv_addr;
+ struct hostent * server;
+
+ char buffer[256];
+
+ 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);
+ }
+
+ /* Do processing
+ */
+
+ //send user name
+
+ bzero(buffer, 256);
+
+ sprintf(buffer, "xiaoxuanl4\n");
+ n = write(sockfd, buffer, strlen(buffer));
+
+ //send g^b(mod p)
+
+ int g=15;
+ int p=97;
+
+ bzero(buffer, 256);
+
+ char command[50];
+ strcpy(command, "openssl sha256 dh.c > hash.txt" );
+ FILE *fp;
+ fp = fopen("hash.txt", "r");
+ while((fgetc(fp) != EOF) && (fgetc(fp) != ' ')) {
+ char first = fgetc(fp);
+ char second = fgetc(fp);
+ }
+
+ int first_num;
+ int second_num;
+
+ //converting
+ if(isalpha(first)){
+ first_num = first - 87;
+ }
+ else{
+ first_num = first - 48;
+ }
+
+ if(isalpha(second)){
+ second_num = second - 87;
+ }
+ else{
+ second_num = second - 48;
+ }
+ //finally my b value
+ int b = (first_num * 16) + second_num;
+ //Assume I am Bob
+ int Bob_req = compute(g, b, p);
+
+ sprintf(buffer, "%d\n", Bob_req);
+ n = write(sockfd, buffer, strlen(buffer));
+
+ if (n < 0)
+ {
+ perror("ERROR writing to socket");
+ exit(0);
+ }
+
+ bzero(buffer, 256);
+
+ n = read(sockfd, buffer, 255);
+
+ if (n < 0)
+ {
+ perror("ERROR reading from socket");
+ exit(0);
+ }
+ //server is Alice
+ int Alice_res = atoi(buffer);
+ int Bob_res_again= compute(Alice_res, b, p);
+
+ bzero(buffer, 256);
+ sprintf(buffer, "%d\n", Bob_res_again);
+ n = write(sockfd, buffer, strlen(buffer));
+
+ bzero(buffer, 256);
+
+ n = read(sockfd, buffer, 255);
+
+ printf("status report: %s\n", buffer);
+
+ return 0;
+}
--
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