C++ 实现 AES 和 RSA 加密算法：代码示例

以下是 C++ 编程实现 AES 和 RSA 加密算法的示例代码，代码中展示了算法的关键步骤，并解释了相关函数的作用，但并非完整的安全加密方案，实际应用中需要根据具体算法规范进行编写。

AES 加密算法实现

#include <iostream>
#include <cstdint>
#include <cstring>

// AES加密函数
void AESEncrypt(const uint8_t* plaintext, const uint8_t* key, uint8_t* ciphertext) {
    // 实现AES加密算法的具体逻辑
    // ...
}

int main() {
    uint8_t plaintext[16] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};
    uint8_t key[16] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};
    uint8_t ciphertext[16];

    AESEncrypt(plaintext, key, ciphertext);

    return 0;
}

RSA 加密算法实现

#include <iostream>
#include <cstdint>
#include <cstring>
#include <cmath>

// 求最大公约数
uint64_t gcd(uint64_t a, uint64_t b) {
    if (b == 0) {
        return a;
    }
    return gcd(b, a % b);
}

// 求模逆元
uint64_t modInverse(uint64_t a, uint64_t m) {
    uint64_t m0 = m;
    uint64_t y = 0, x = 1;

    if (m == 1) {
        return 0;
    }

    while (a > 1) {
        uint64_t q = a / m;
        uint64_t t = m;

        m = a % m;
        a = t;
        t = y;

        y = x - q * y;
        x = t;
    }

    if (x < 0) {
        x += m0;
    }

    return x;
}

// RSA加密函数
void RSAEncrypt(uint64_t plaintext, uint64_t e, uint64_t n, uint64_t& ciphertext) {
    ciphertext = static_cast<uint64_t>(pow(plaintext, e)) % n;
}

int main() {
    uint64_t plaintext = 123456;
    uint64_t e = 65537;
    uint64_t n = 123456789;
    uint64_t ciphertext;

    RSAEncrypt(plaintext, e, n, ciphertext);

    return 0;
}