From f78a79609363b2043b18146d6f1d100a5b8a7052 Mon Sep 17 00:00:00 2001
From: couturie <you@example.com>
Date: Sat, 14 Apr 2018 18:19:58 +0200
Subject: [PATCH 1/1] first version cipher_h265

---
 CipherVid/cipher_h265.cpp | 157 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 CipherVid/cipher_h265.cpp

diff --git a/CipherVid/cipher_h265.cpp b/CipherVid/cipher_h265.cpp
new file mode 100644
index 0000000..c1bf3b4
--- /dev/null
+++ b/CipherVid/cipher_h265.cpp
@@ -0,0 +1,157 @@
+//g++     cipher_h265.cpp   -o cipher_h265 -O3
+
+//example   vid.h265   seed
+//cipher_h265 vid1.h265 38762
+
+
+#include <iostream>
+#include <fstream>
+#include <iterator>
+#include <vector>
+
+
+using namespace std;
+
+typedef unsigned char uchar;
+
+uchar modulo(int x,int N){ return (x % N + N) %N; }
+
+
+void cipher_frame(uchar *buf, int start_sl, int end_sl, int enc) {
+  for(int i=0;i<(end_sl-start_sl)/2;i++) {
+    int p=lrand48()%(end_sl-start_sl)+start_sl;
+    if(p<start_sl || p>=end_sl)
+      cout<<"pb"<<endl;
+    while(buf[p-1]==255 || buf[p]==255 ){
+      p=lrand48()%(end_sl-start_sl)+start_sl;
+      if(p<start_sl || p>=end_sl)
+	cout<<"pb2"<<endl;
+	}
+    uchar v=lrand48()%255;
+    if(enc) {
+      buf[p]=modulo((int)buf[p]+(int)v,255);
+    }
+    else {
+      buf[p]=modulo((int)buf[p]-(int)v,255);
+    }
+  }
+  
+}
+
+
+
+void fxor(uchar *buf,int sz, int seed,int enc) {
+  int start_sl,end_sl;
+
+
+  int offset=0;
+  
+  srand48(seed);
+  
+  for(int i=0;i<sz-6;i++) {
+    if(((uint)buf[i])==0x00 && ((uint)buf[i+1])==0x00 &&  ((uint)buf[i+2])==0x01)  {
+
+      if ((  ((uint)buf[i+3])==0x26 ||   ((uint)buf[i+3])==0x2a )  &&  ((uint)buf[i+4])==0x01   ) {
+	cout<<"IDR or I slice "<<i<<"\t";
+	start_sl=i+7+offset;
+	int stop=0;
+	for(int k=i+1;k<sz-4 && !stop;k++) {
+	  if(((uint)buf[k])==0x00 && ((uint)buf[k+1])==0x00 && ((uint)buf[k+2])==0x00  && ((uint)buf[k+3])==0x01 ) {
+	    cout<<"end "<<k<<endl;
+	    stop=1;
+	    end_sl=k;//-offset;
+	  }
+	}
+	
+	
+	cipher_frame(buf, start_sl, end_sl, enc);
+	
+	
+	
+      }
+
+
+
+
+    }
+
+
+    if(((uint)buf[i])==0x00 && ((uint)buf[i+1])==0x00  && ((uint)buf[i+2])==0x00  &&  ((uint)buf[i+3])==0x01)  {
+
+      if (  (  ((uint)buf[i+4])==0x02 || ((uint)buf[i+4])==0x10 || ((uint)buf[i+4])==0x12  ) &&  ((uint)buf[i+5])==0x01   ) {
+	cout<<"B or P slice "<<i<<"\t";
+	start_sl=i+7+offset;
+	int stop=0;
+	for(int k=i+1;k<sz-4 && !stop;k++) {
+	  if(((uint)buf[k])==0x00 && ((uint)buf[k+1])==0x00 && ((uint)buf[k+2])==0x00  && ((uint)buf[k+3])==0x01 ) {
+	    cout<<"end "<<k<<endl;
+	    stop=1;
+	    end_sl=k;//-offset;
+	  }
+	}
+	
+	
+	cipher_frame(buf, start_sl, end_sl, enc);
+	
+	
+	
+      }
+
+    }
+
+
+    
+  }
+
+//	cipher_frame(buf, 1000, sz, enc);
+
+  
+}
+
+
+int  main(int argc, char **argv){
+  cout<<argv[1]<< endl;
+
+  FILE *fp;
+  fp = fopen(argv[1], "r");
+  fseek(fp, 0L, SEEK_END);
+  int sz = ftell(fp);
+  fseek(fp, 0, SEEK_SET);
+
+  uchar *buf=(uchar*)malloc(sz);
+  uchar *buf2=(uchar*)malloc(sz);
+  fread(buf, sz, 1, fp);
+  fclose(fp);
+
+   
+  int seed=atoi(argv[2]);
+  cout<<sz<<endl;
+ 
+
+  fxor(buf,sz,seed,1);
+  
+
+  fp = fopen("lena2.h265", "w");
+  fwrite (buf , 1, sz, fp);
+  fclose(fp);
+
+  for(int i=0;i<sz;i++) {
+    buf2[i]=buf[i];
+  }
+
+  
+
+
+  fxor(buf2,sz,seed,0);
+
+  fp = fopen("lena3.h265", "w");
+  fwrite (buf2 , 1, sz, fp);
+  fclose(fp);
+
+
+
+
+
+
+
+}
-- 
2.39.5