From 2bf5effe95641667a1ed51c04eff7760f6a42ef4 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Mon, 3 Oct 2016 13:00:14 +0200
Subject: Initial

---
 main.cpp | 141 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 main.cpp

(limited to 'main.cpp')

diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..ce1573f
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,141 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+#include <cstdlib>
+#include <cctype>
+#include <ctime>
+#include <cassert>
+#include "bigint.h"
+#include "numalgo.h"
+#include "rsa.h"
+
+using namespace std;
+
+class eof_error : public runtime_error{
+public:
+	eof_error()
+		:runtime_error("EOF"){}
+};
+
+int64_t rand64(){
+	return ((int64_t)rand()<<32)+(((int64_t)rand()%2)<<31)+rand();
+}
+
+Bigint readevalexpr(istream &is){
+	Bigint a;
+	is>>a;
+	if(is.eof())throw eof_error();
+	// cerr<<"Read "<<a<<endl;
+	if(!is.fail())return a;
+	is.clear();
+	string s;
+	is>>s;
+	assert(!is.fail());
+	a=readevalexpr(is);
+	Bigint b=readevalexpr(is);
+	//cerr<<"Operation "<<s<<" on "<<a<<" and "<<b<<endl;
+	if(s=="add")return a+b;
+	else if(s=="sub")return a-b;
+	else if(s=="mul")return a*b;
+	else if(s=="div")return a.divmod(b).first;
+	else if(s=="mod")return a.divmod(b).second;
+	else {
+		cerr<<"Unknown operation '"<<s<<'\''<<endl;
+		assert(false);
+	}
+}
+
+void biginttest(){
+	srand(time(NULL));
+
+	// cerr<<Bigint(599428191)*Bigint(10)<<endl;
+	// cerr<<hex<<Bigint(599428191)*Bigint(10)<<endl;
+
+#if 1
+	{
+		Bigint bi;
+		assert(RAND_MAX==(1U<<31)-1);
+		for(int i=0;i<500000;i++){
+			int64_t a=rand64(),b=rand64();
+			if(a+b<0){i--; continue;}
+			stringstream s1,s2,s3;
+			s1<<a+b;
+			s2<<Bigint(a+b);
+			s3<<Bigint(a)+Bigint(b);
+			assert(s1.str()==s2.str()&&s1.str()==s3.str());
+		}
+	}
+#endif
+
+#if 1
+	{
+		for(int i=0;i<1000;i++){
+			int64_t n=rand64();
+			istringstream ss(to_string(n));
+			Bigint bi;
+			ss>>bi;
+			assert(bi==Bigint(n));
+		}
+	}
+#endif
+
+#if 1
+	{
+		string s="4405994068155852661780322209877856931246944549396705884037139443014164958640201650440984581318995014";
+		istringstream iss(s);
+		Bigint bi;
+		iss>>bi;
+		uint32_t digs[11]={1752788038,953502834,2175607868,1627159508,1754291416,1207689192,3196357285,3165170272,3313904421,3194703103,2062};
+		for(int i=0;i<11;i++)assert(bi._digit(i)==digs[i]);
+		ostringstream oss;
+		oss<<bi;
+		assert(oss.str()==s);
+	}
+#endif
+}
+
+void repl(int argc,char **argv){
+	istream *in;
+	if(argc==2)in=new ifstream(argv[1]);
+	else in=&cin;
+	for(int i=0;;i++){
+		try {
+			cout<<readevalexpr(*in)<<endl;
+		} catch(eof_error){
+			break;
+		}
+	}
+}
+
+void performrsa(){
+	PrivateKey privkey;
+	Bigint p(1000000007),q(3000000019);
+	privkey.pub.mod=3000000040000000133LL;
+	privkey.pub.exp=65537;
+	{
+		Bigint x;
+		Bigint one(1);
+		egcd((p-one)*(q-one),privkey.pub.exp,x,privkey.pexp);
+	}
+	cout<<"d = "<<privkey.pexp<<endl;
+	Bigint msg(123456789);
+	cout<<"msg = "<<msg<<endl;
+	Bigint encr=encrypt(privkey.pub,msg);
+	cout<<"encr = "<<encr<<endl;
+	Bigint msg2=decrypt(privkey,encr);
+	cout<<"msg = "<<msg2<<endl;
+}
+
+int main(int,char**){
+	// biginttest();
+	// repl(argc,argv);
+	performrsa();
+	// cout<<Bigint(0)-Bigint(69255535LL)<<endl;
+	// cout<<Bigint(0)-Bigint(669255535LL)<<endl;
+	// cout<<Bigint(0)-Bigint(5669255535LL)<<endl;
+	// cout<<Bigint(0)-Bigint(75669255535LL)<<endl;
+	// cout<<Bigint(0)-Bigint(775669255535LL)<<endl;
+	// cout<<Bigint(0)-Bigint(5775669255535LL)<<endl;
+	// cout<<Bigint(0)-Bigint(45775669255535LL)<<endl;
+}
-- 
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