定义一个基础加密解密类:分别采用公有派生和私有派生派生出异或加密类,并解决明文、密文和解密结果的输出函数的冲突,通过基类指针调用派生类对象,说明两种派生方式的差异 步骤: 定义一个加密类,有明文、密文和解密结果,以及加密、解密等虚函数 异或加密类中重载加密与解密函数 通过基础加密解密类指针调用派生类对象
时间: 2024-02-27 18:58:09 浏览: 19
好的,我理解了你的问题。以下是代码实现:
```c++
#include <iostream>
#include <cstring>
using namespace std;
class Encryption {
protected:
string plaintext; //明文
string ciphertext; //密文
string decryptedtext; //解密结果
public:
virtual void encrypt() = 0; //加密
virtual void decrypt() = 0; //解密
void setPlaintext(string text) {
plaintext = text;
}
void setCiphertext(string text) {
ciphertext = text;
}
void setDecryptedtext(string text) {
decryptedtext = text;
}
string getPlaintext() {
return plaintext;
}
string getCiphertext() {
return ciphertext;
}
string getDecryptedtext() {
return decryptedtext;
}
};
class PublicDerivedEncryption : public Encryption {
public:
void encrypt() override {
ciphertext = plaintext;
for (int i = 0; i < ciphertext.size(); i++) {
ciphertext[i] = ciphertext[i] ^ 0x55; //异或加密
}
}
void decrypt() override {
decryptedtext = ciphertext;
for (int i = 0; i < decryptedtext.size(); i++) {
decryptedtext[i] = decryptedtext[i] ^ 0x55; //异或解密
}
}
};
class PrivateDerivedEncryption : private Encryption {
public:
void encrypt() override {
ciphertext = plaintext;
for (int i = 0; i < ciphertext.size(); i++) {
ciphertext[i] = ciphertext[i] ^ 0xAA; //异或加密
}
}
void decrypt() override {
decryptedtext = ciphertext;
for (int i = 0; i < decryptedtext.size(); i++) {
decryptedtext[i] = decryptedtext[i] ^ 0xAA; //异或解密
}
}
void setPlaintext(string text) { //解决冲突
Encryption::setPlaintext(text);
}
void setCiphertext(string text) { //解决冲突
Encryption::setCiphertext(text);
}
void setDecryptedtext(string text) { //解决冲突
Encryption::setDecryptedtext(text);
}
string getPlaintext() { //解决冲突
return Encryption::getPlaintext();
}
string getCiphertext() { //解决冲突
return Encryption::getCiphertext();
}
string getDecryptedtext() { //解决冲突
return Encryption::getDecryptedtext();
}
};
int main() {
Encryption* encry1 = new PublicDerivedEncryption();
encry1->setPlaintext("Hello World!");
encry1->encrypt();
cout << "Public Derived Encryption:" << endl;
cout << "Plaintext: " << encry1->getPlaintext() << endl;
cout << "Ciphertext: " << encry1->getCiphertext() << endl;
encry1->decrypt();
cout << "Decryptedtext: " << encry1->getDecryptedtext() << endl;
Encryption* encry2 = new PrivateDerivedEncryption();
encry2->setPlaintext("Hello World!");
encry2->encrypt();
cout << "Private Derived Encryption:" << endl;
cout << "Plaintext: " << encry2->getPlaintext() << endl;
cout << "Ciphertext: " << encry2->getCiphertext() << endl;
encry2->decrypt();
cout << "Decryptedtext: " << encry2->getDecryptedtext() << endl;
return 0;
}
```
在这个程序中,我们首先定义了一个抽象类 `Encryption`,其中包含了明文、密文、解密结果三个变量,以及加密、解密两个纯虚函数。接着,我们分别采用公有派生和私有派生,派生出了两个异或加密类 `PublicDerivedEncryption` 和 `PrivateDerivedEncryption`。其中,`PublicDerivedEncryption` 采用公有派生,因此可以直接访问 `Encryption` 类中的成员变量和成员函数。而 `PrivateDerivedEncryption` 采用私有派生,在类的内部可以直接访问 `Encryption` 类中的成员变量和成员函数,但在类的外部必须通过公有函数访问。我们在 `PrivateDerivedEncryption` 中,重新定义了 `setPlaintext`、`setCiphertext`、`setDecryptedtext`、`getPlaintext`、`getCiphertext`、`getDecryptedtext`,解决了明文、密文和解密结果的输出函数的冲突。
最后,我们通过基础加密解密类指针调用派生类对象,说明了两种派生方式的差异。其中,公有派生的对象可以直接赋值给基类指针,而私有派生的对象必须通过强制类型转换才能赋值给基类指针。