Vernam Cipher Problem

[NewatCplusplus]

Hello, I am having a problem with my Vernam cipher code. I'm not very C++ savvy and I'm having a hard time fixing my errors. I don't think my lines transferred correctly to the post. My apologies.

The errors I'm having are:
../src/Encryptor.h:16: error: extra qualification ‘Encryptor::’ on member ‘encrypt’
../src/Encryptor.h:17: error: extra qualification ‘Encryptor::’ on member ‘decrypt’
../src/Encryptor.cpp: In function ‘void First_test(std::string, std::string)’:
../src/Encryptor.cpp:54: error: no matching function for call to ‘Encryptor::encrypt(std::string&)’
../src/Encryptor.cpp:19: note: candidates are: std::string Encryptor::encrypt(std::string, std::string)
../src/Encryptor.cpp:57: error: no matching function for call to ‘Encryptor::decrypt(std::string&)’
../src/Encryptor.cpp:32: note: candidates are: std::string Encryptor::decrypt(std::string, std::string)
../src/Encryptor.cpp: In function ‘void Second_test(std::string, std::string)’:
../src/Encryptor.cpp:70: error: no matching function for call to ‘Encryptor::encrypt(std::string&)’
../src/Encryptor.cpp:19: note: candidates are: std::string Encryptor::encrypt(std::string, std::string)
../src/Encryptor.cpp:73: error: no matching function for call to ‘Encryptor::decrypt(std::string&)’
../src/Encryptor.cpp:32: note: candidates are: std::string Encryptor::decrypt(std::string, std::string)


This is my .hpp file.

#ifndef ENCRYPTOR_H_
#define ENCRYPTOR_H_
#include <string>

class Encryptor {
public:
	Encryptor();
	Encryptor(std::string key);
	std::string Encryptor::encrypt(std::string plaintext, std::string value);
	std::string Encryptor::decrypt(std::string ciphertext, std::string str);
	void First_test(std::string key, std::string plaintext);
	void Second_test (std::string key, std::string plaintext);



private:
	std::string key;

};

#endif /* ENCRYPTOR_H_ */ 

Here is my .cpp file.

#include <iostream>
#include <string>
#include "Encryptor.h"

Encryptor::Encryptor(std::string key) {
	this->key = key;
	// TODO Auto-generated constructor stub

}


//This is where we encrypt the plaintext.
std::string Encryptor::encrypt(std::string plaintext, std::string value) {
	std::string retval;
	std::string ciphertext;
	unsigned int k=0;

	for (unsigned int v = 0; v<value.length();v++) {
		retval.at(v) = value.at(7) ^ key.at(0);
		k = (++k < key.length()?k:0);
	}
	return retval;
}

//This is where we decrypt the cyphertext.
std::string Encryptor::decrypt(std::string ciphertext, std::string str) {
	std::string dec(str);
	unsigned int k = 0;

	for (unsigned int i = 0; i <str.length(); i++) {
		dec[i] = str[i] ^ key[k];
		k = (++k < key.length() ?k: 0);
	}
	return dec;
};

//First Test
void First_test(std::string key, std::string plaintext) {
	Encryptor en(key);
	if(key.length() < plaintext.length())
		std::cout << "The plaintext is longer than the key\n";
	else if (key.length() == plaintext.length())
		std::cout << "The plaintext is the same length as the key\n";
	else
		std::cout << "The plaintext is shorter than the key.\n";

//Encrypting the statement.
	std::string ciphertext = en.encrypt(plaintext);
	std::cout << "\nCipherText:" << ciphertext << std::endl;
//Decrypting the statement.
	std::string text = en.decrypt(ciphertext);
	std::cout <<"\nDecryptedText:" << text << std::endl;
if (text == plaintext)
	std::cout << "\n Encrypt and Decrypts are correct.\n";
else
	std::cout << "\nThey are not correct.\n";
}

//This is the function for the second test.
void Second_test(std::string key, std::string plaintext) {
	Encryptor en(key);
	Encryptor en2("newKey");
//Encrypting the statement.
	std::string ciphertext = en.encrypt(plaintext);
	std::cout << "\nCipherText:" << ciphertext << std::endl;
//Decrypting the statement.
	std::string text = en2.decrypt(ciphertext);
	std::cout << "\n DecryptedText:" << text << std::endl;
	if (text == plaintext)
		std::cout << "\n Encrypt and Decrypts are correct.\n";
	else
		std::cout << "\nThey are not correct.\n";


}

[coder777]

In your .hpp:
Line 9/10: Remove the extra Encryptor::

In your .cpp:
Both encrypt and decrypt require two parameter, but you provide just one.
First_test and Second_test are members of the class in your .hpp

[NewatCplusplus]

How do I go about to fix the First_test and Second_test?

[NewatCplusplus]

Can I have some more help?

[Zhuge]

They (that is, First_test() and Second_test()) should probably either be in your class in both files, or outside of it in both files, not mixed as you have it. Is that what you were asking about?