Thread: Header File Errors...

  1. #1
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    Header File Errors...

    I'm getting a bunch of errors with this header file i made.

    I wrote an encryption scheme and instead of copy and pasting all the prototypes and such into any other program i want to use the algorithm in i decided to do the normal thing and put it in a header file.

    however, i set it up the way i "thought" it was supposed to be setup and the way i've used it before but i get a bunch of errors:
    c:\documents and settings\doug.laptop.000\my documents\visual studio 2005\projects\tdea\tdea\dea.h(3) : error C2065: 'string' : undeclared identifier
    c:\documents and settings\doug.laptop.000\my documents\visual studio 2005\projects\tdea\tdea\dea.h(3) : error C2065: 'text' : undeclared identifier
    c:\documents and settings\doug.laptop.000\my documents\visual studio 2005\projects\tdea\tdea\dea.h(3) : error C2182: 'appendString' : illegal use of type 'void'
    c:\documents and settings\doug.laptop.000\my documents\visual studio 2005\projects\tdea\tdea\dea.h(3) : fatal error C1903: unable to recover from previous error(s); stopping compilation
    Main.cpp
    c:\documents and settings\doug.laptop.000\my documents\visual studio 2005\projects\tdea\tdea\dea.h(3) : error C2065: 'string' : undeclared identifier
    c:\documents and settings\doug.laptop.000\my documents\visual studio 2005\projects\tdea\tdea\dea.h(3) : error C2065: 'text' : undeclared identifier
    c:\documents and settings\doug.laptop.000\my documents\visual studio 2005\projects\tdea\tdea\dea.h(3) : error C2182: 'appendString' : illegal use of type 'void'
    c:\documents and settings\doug.laptop.000\my documents\visual studio 2005\projects\tdea\tdea\dea.h(3) : fatal error C1903: unable to recover from previous error(s); stopping compilation
    If you guys need the source code just lemme know.


    Thanks so much!
    "Anyone can aspire to greatness if they try hard enough."
    - Me

  2. #2
    Hurry Slowly vart's Avatar
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    probably std::string should be

    but the posting code that causes errors may help
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  3. #3
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    Oaky Doaky...

    Main.cpp:
    Code:
    #include <iostream>
    #include <string>
    #include <vector>
    #include <fstream>
    #include "dea.h"
    
    #define		VERSION		"1.0.0"
    
    using namespace std;
    
    void divyKey(string key, string &key0, string &key1, string &key2);
    
    void encryptTDEA(string &ptext, string key, string &ctext);
    void decryptTDEA(string ctext, string key, string &ptext);
    
    int main()
    {
    	//infinite loop
    	while(1)
    	{
    		//title
    		system("cls");
    		//title
    		cout<<"**************************************"<<endl
    			<<"*  Triple Daly Encryption Algorithm  *"<<endl
    			<<"*       T.D.E.A.			V. "<<VERSION<<"    *"<<endl
    			<<"**************************************"<<endl<<endl;
    		//menu
    		cout<<"(1) Encrypt"<<endl
    			<<"(2) Decrypt"<<endl
    			<<"(3) View File"<<endl
    			<<"(4) Write File"<<endl
    			<<"(5) Delete File"<<endl
    			<<"(6) Convert File"<<endl
    			<<"(7) About"<<endl
    			<<"(8) Help"<<endl
    			<<"(9) Exit"<<endl<<endl;
    		string mchoice;
    		cout<<"Choice: ";
    		getline(cin, mchoice);
    		//evaluate choice
    		if(mchoice == "1")
    		{
    			//Encrypt
    			continue;
    		}
    		else if(mchoice == "2")
    		{
    			//Decrypt
    			continue;
    		}
    		else if(mchoice == "3")
    		{
    			//view File
    			continue;
    		}
    		else if(mchoice == "4")
    		{
    			//Write File
    			continue;
    		}
    		else if(mchoice == "5")
    		{
    			//Delete File
    			continue;
    		}
    		else if(mchoice == "6")
    		{
    			//Convert File
    			continue;
    		}
    		else if(mchoice == "7")
    		{
    			//About
    			continue;
    		}
    		else if(mchoice == "8")
    		{
    			//Help
    			continue;
    		}
    		else if(mchoice == "9")
    		{
    			//Quit
    			break;
    		}
    		else{
    			//Wrong choice
    			cout<<endl<<"Incorrect Choice!";
    			cin.ignore();
    			continue;
    		}
    	}
    	return 0;
    }
    
    void divyKey(string key, string &key0, string &key1, string &key2)
    {
    	//Divide key into 3 64-bit chunks
    	// (assumes bounds checking beforehand)
    	for(int i=0; i<8; i++)
    	{
    		key0.push_back(key.at(i));
    	}
    	for(int i=8; i<16; i++)
    	{
    		key1.push_back(key.at(i));
    	}
    	for(int i=16; i<24; i++)
    	{
    		key2.push_back(key.at(i));
    	}
    }
    
    void encryptTDEA(string &ptext, string key, string &ctext)
    {
    	//pad
    	appendString(ptext);
    	//divide key
    	string k1;
    	string k2;
    	string k3;
    	divyKey(key, k1, k2, k3);
    	//ENCRYPT
    	string c1;
    	string c2;
    	encryptDEA(ptext, k1, c1);
    	encryptDEA(c1, k2, c2);
    	encryptDEA(c2, k3, ctext);
    	//DONE
    }
    
    void decryptTDEA(string ctext, string key, string &ptext)
    {
    	string k1;
    	string k2;
    	string k3;
    	string d1;
    	string d2;
    	divyKey(key, k1, k2, k3);
    	//DECRYPT
    	decryptDEA(ctext, k3, d1);
    	decryptDEA(d1, k2, d2);
    	decryptDEA(d2, k1, ptext);
    	//DONE
    }
    dea.h:
    Code:
    #define EXTENSION	".dea"
    
    void appendString(string &text);
    void divyBlocks(string ptext, string &block, int &rem);
    void ePermutation(string &block);
    void dPermutation(string &block);
    void divideText(string block, string &first, string &second, string &third, string &fourth);
    void divideKey(string key, string &left, string &right);
    void xor(string &text, string hKey);
    void eSubstitution(string &text);
    void dSubstitution(string &text);
    void clearAppend(string &text);
    
    void writeFile(string file, string text);
    void readFile(string file, string &text);
    void convertFile(string file, string ext);
    void deleteFile(string file);
    
    void encrypt(string &block, string key);
    void decrypt(string &block, string key);
    
    void encryptDEA(string &ptext, string key, string &ctext);
    void decryptDEA(string ctext, string key, string &ptext);
    dea.cpp:
    Code:
    #include "dea.h"
    
    void xor(string &text, string hKey)
    {
    	if(text.size() == hKey.size())
    	{
    		for(int i=0; i<text.size(); i++)
    		{
    			text.at(i) ^= hKey.at(i);
    		}
    	}
    }
    
    void appendString(string &text)
    {
    	int size = text.size();
    	size = size &#37; 16;
    	for(int i = (16-size); i > 0; i--)
    	{
    		text.push_back('x');
    	}
    }
    
    void divyBlocks(string ptext, string &block, int &rem)
    {
    	int size = (ptext.size() / 16);
    	int mult = size-rem;
    	int start = (mult * 16);
    	block.clear();
    	if(rem > 0)
    	{
    		for(int i=0; i<16; i++)
    		{
    			block.push_back(ptext.at(start + i));
    		}
    		rem--;
    	}
    }
    
    void divideText(string block, string &first, string &second, string &third, string &fourth)
    {
    	first.clear();
    	second.clear();
    	third.clear();
    	fourth.clear();
    	for(int i=0; i<4; i++)
    	{
    		first.push_back(block.at(i));
    	}
    	for(int i=4; i<8; i++)
    	{
    		second.push_back(block.at(i));
    	}
    	for(int i=8; i<12; i++)
    	{
    		third.push_back(block.at(i));
    	}
    	for(int i=12; i<16; i++)
    	{
    		fourth.push_back(block.at(i));
    	}
    }
    
    void ePermutation(string &block)
    {
    	char temp;
    	char temp2;
    	for(int i=0; i<3; i++)
    	{
    		//shift everything one to the left
    		temp = block.at(0);
    		for(int j=3; j>=0; j--)
    		{
    			temp2 = block.at(j);
    			block.at(j) = temp;
    			temp = temp2;
    		}
    	}
    }
    
    void dPermutation(string &block)
    {
    	char temp;
    	char temp2;
    	for(int i=0; i<3; i++)
    	{
    		temp = block.at(3);
    		for(int j=0; j<4; j++)
    		{
    			temp2 = block.at(j);
    			block.at(j) = temp;
    			temp = temp2;
    		}
    	}
    }
    
    void divideKey(string key, string &left, string &right)
    {
    	left.clear();
    	right.clear();
    	for(int i=0; i<4; i++)
    	{
    		left.push_back(key.at(i));
    	}
    	for(int i=4; i<8; i++)
    	{
    		right.push_back(key.at(i));
    	}
    }
    
    void encrypt(string &block, string key)
    {
    	string first, second, third, fourth;
    	divideText(block, first, second, third, fourth);
    	string kLeft, kRight;
    	divideKey(key, kLeft, kRight);
    	//Run the encryption
    	//ROUND 1
    	// xor left key and first block
    	xor(first, kLeft);
    	// substitute
    	eSubstitution(second);
    	// xor right key and 3rd block
    	xor(third, kRight);
    	// permutate
    	ePermutation(fourth);
    	//ROUND 2
    	xor(fourth, kLeft);
    	eSubstitution(first);
    	xor(second, kRight);
    	ePermutation(third);
    	//ROUND 3
    	xor(third, kLeft);
    	eSubstitution(fourth);
    	xor(first, kRight);
    	ePermutation(second);
    	//ROUND 4
    	xor(second, kLeft);
    	eSubstitution(third);
    	xor(fourth, kRight);
    	ePermutation(first);
    	//FINISHED ONE BLOCK
    	block.clear();
    	//reset the block
    	block = (first + second + third + fourth);
    	//DONE
    }
    
    void decrypt(string &block, string key)
    {
    	string first, second, third, fourth;
    	divideText(block, first, second, third, fourth);
    	string kLeft, kRight;
    	divideKey(key, kLeft, kRight);
    	//Run the decryption
    	//ROUND 1
    	dPermutation(first);
    	xor(second, kLeft);
    	dSubstitution(third);
    	xor(fourth, kRight);
    	//ROUND 2
    	xor(first, kRight);
    	dPermutation(second);
    	xor(third, kLeft);
    	dSubstitution(fourth);
    	//ROUND 3
    	dSubstitution(first);
    	xor(second, kRight);
    	dPermutation(third);
    	xor(fourth, kLeft);
    	//ROUND 4
    	xor(first, kLeft);
    	dSubstitution(second);
    	xor(third, kRight);
    	dPermutation(fourth);
    	//FINISHED ONE BLOCK
    	block.clear();
    	//reset the block
    	block = (first + second + third + fourth);
    	//DONE
    }
    
    void eSubstitution(string &text)
    {
    	int subTable[256] = {27, 144, 241, 223, 244, 24, 1, 60, 149, 154, 50, 174, 70, 132, 167, 86, 38, 188, 3, 233, 128, 130, 39, 118, 175, 22, 46, 84, 191, 42, 19, 113, 153, 225, 227, 110, 114, 254, 25, 230, 181, 185, 207, 2, 226, 243, 150, 236, 187, 14, 77, 116, 249, 137, 182, 133, 125, 17, 152, 197, 143, 105, 208, 57, 168, 119, 36, 224, 120, 189, 146, 90, 166, 101, 210, 201, 11, 82, 196, 23, 56, 43, 44, 159, 12, 157, 123, 5, 156, 96, 97, 160, 242, 9, 171, 121, 220, 95, 85, 41, 212, 237, 69, 139, 20, 228, 194, 59, 253, 195, 203, 161, 7, 200, 192, 169, 115, 21, 204, 91, 30, 75, 164, 252, 172, 117, 88, 13, 89, 247, 32, 108, 206, 178, 65, 81, 198, 145, 147, 170, 190, 209, 54, 67, 0, 179, 79, 6, 26, 4, 64, 124, 98, 62, 29, 193, 127, 104, 45, 140, 74, 218, 93, 134, 176, 232, 28, 202, 221, 234, 49, 35, 235, 155, 68, 217, 102, 33, 142, 251, 58, 231, 131, 135, 63, 163, 205, 87, 112, 165, 222, 245, 40, 72, 141, 246, 186, 92, 238, 255, 173, 37, 111, 240, 15, 76, 126, 248, 199, 122, 148, 213, 16, 48, 34, 78, 103, 47, 158, 219, 52, 73, 18, 106, 94, 183, 99, 53, 214, 83, 177, 107, 100, 211, 61, 66, 51, 138, 239, 31, 80, 8, 250, 71, 55, 109, 184, 229, 215, 10, 162, 151, 216, 180, 129, 136};
    	//substitute
    	for(int i=0; i<4; i++)
    	{
    		text.at(i) = ((char)subTable[((int)((unsigned char)text.at(i)))]);
    	}
    }
    
    void dSubstitution(string &text)
    {
    	int subTable[256] = {144, 6, 43, 18, 149, 87, 147, 112, 241, 93, 249, 76, 84, 127, 49, 204, 212, 57, 222, 30, 104, 117, 25, 79, 5, 38, 148, 0, 166, 154, 120, 239, 130, 177, 214, 171, 66, 201, 16, 22, 192, 99, 29, 81, 82, 158, 26, 217, 213, 170, 10, 236, 220, 227, 142, 244, 80, 63, 180, 107, 7, 234, 153, 184, 150, 134, 235, 143, 174, 102, 12, 243, 193, 221, 160, 121, 205, 50, 215, 146, 240, 135, 77, 229, 27, 98, 15, 187, 126, 128, 71, 119, 197, 162, 224, 97, 89, 90, 152, 226, 232, 73, 176, 216, 157, 61, 223, 231, 131, 245, 35, 202, 188, 31, 36, 116, 51, 125, 23, 65, 68, 95, 209, 86, 151, 56, 206, 156, 20, 254, 21, 182, 13, 55, 163, 183, 255, 53, 237, 103, 159, 194, 178, 60, 1, 137, 70, 138, 210, 8, 46, 251, 58, 32, 9, 173, 88, 85, 218, 83, 91, 111, 250, 185, 122, 189, 72, 14, 64, 115, 139, 94, 124, 200, 11, 24, 164, 230, 133, 145, 253, 40, 54, 225, 246, 41, 196, 48, 17, 69, 140, 28, 114, 155, 106, 109, 78, 59, 136, 208, 113, 75, 167, 110, 118, 186, 132, 42, 62, 141, 74, 233, 100, 211, 228, 248, 252, 175, 161, 219, 96, 168, 190, 3, 67, 33, 44, 34, 105, 247, 39, 181, 165, 19, 169, 172, 47, 101, 198, 238, 203, 2, 92, 45, 4, 191, 195, 129, 207, 52, 242, 179, 123, 108, 37, 199};
    	//substitute
    	for(int i=0; i<4; i++)
    	{
    		text.at(i) = ((char)subTable[((int)((unsigned char)text.at(i)))]);
    	}
    }
    
    void encryptDEA(string &ptext, string key, string &ctext)
    {
    	//CBC Mode
    	string prevBlock = "";
    	appendString(ptext);
    	string block;
    	int r = ptext.size()/16;
    	//ENCRYPTION
    	for(int i=r; i>0; i--)
    	{
    		divyBlocks(ptext, block, r);
    		xor(block, prevBlock);
    		encrypt(block, key);
    		prevBlock = block;
    		ctext += block;
    	}
    }
    
    void decryptDEA(string ctext, string key, string &ptext)
    {
    	//CBC Mode
    	string block;
    	int j;
    	string prevBlock = "";
    	string xblock = "";
    	int r = ctext.size()/16;
    	//DECRYPTION
    	j = r;
    	for(int i=0; i<j; i++)
    	{
    		divyBlocks(ctext, block, r);
    		prevBlock = block;
    		decrypt(block, key);
    		xor(block, xblock);
    		xblock = prevBlock;
    		ptext += block;
    	}
    	clearAppend(ptext);
    }
    
    void writeFile(string file, string text)
    {
    	file += EXTENSION;
    	ofstream fout(file.c_str());
    	for(int i=0; i<text.size(); i++)
    	{
    		fout<<((int)text.at(i))<<" ";
    	}
    	fout.close();
    }
    
    void readFile(string file, string &text)
    {
    	file += EXTENSION;
    	ifstream fin(file.c_str());
    	text.clear();
    	int temp;
    	vector<int> v;
    	while(fin>>temp)
    	{
    		v.push_back(temp);
    	}
    	fin.close();
    	for(int i=0; i<v.size(); i++)
    	{
    		text.push_back((char)v.at(i));
    	}
    }
    
    void convertFile(string file, string ext)
    {
    	if(ext == "dea" || ext == "DEA" || ext == "Dea")
    	{
    		//file already converted
    	}else{
    		string filename = file + "." + ext;
    		ifstream fin(filename.c_str());
    		char ch;
    		string contents;
    		while(fin.get(ch))
    		{
    			contents+=ch;
    		}
    		fin.close();
    		writeFile(file, contents);
    		remove(filename.c_str());
    	}
    }
    
    void clearAppend(string &text)
    {
    	int i = text.size();
    	i--;
    	while(text.at(i) == 'x')
    	{
    		text.erase(text.begin()+i);
    		i--;
    	}
    }
    
    void deleteFile(string file)
    {
    	//First wipe it
    	file += EXTENSION;
    	ofstream fout(file.c_str());
    	fout.close();
    	//Then delete the actual file
    	remove(file.c_str());
    }

    Thanks!

    PS--------

    Obviously Main.cpp is still a work in progress
    Last edited by Junior89; 07-07-2007 at 11:00 PM. Reason: PS---
    "Anyone can aspire to greatness if they try hard enough."
    - Me

  4. #4
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    You have not included <string> in dea.h.

  5. #5
    Hurry Slowly vart's Avatar
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    also in dea.h all string should be replaced by
    std::string
    because you cannot use
    using namespace in the header (actually can but never should)
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  6. #6
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    Thanks guys! Much appreciated! =)
    "Anyone can aspire to greatness if they try hard enough."
    - Me

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