aes输入字符加密，解密程序c+=

以下是使用AES加密和解密字符的C++代码示例：

#include <iostream>
#include <cstring>
#include <openssl/aes.h>

using namespace std;

// 加密函数
string encrypt(string plainText, string key) {
    unsigned char iv[AES_BLOCK_SIZE] = {0};
    AES_KEY aesKey;
    if (AES_set_encrypt_key((const unsigned char*)key.c_str(), 128, &aesKey) < 0) {
        cerr << "Unable to set encryption key in AES." << endl;
        exit(1);
    }

    int length = (plainText.length() / AES_BLOCK_SIZE + 1) * AES_BLOCK_SIZE;
    unsigned char* inData = new unsigned char[length];
    memset(inData, 0, length);
    memcpy(inData, plainText.c_str(), plainText.length());

    unsigned char* outData = new unsigned char[length];
    memset(outData, 0, length);

    AES_cbc_encrypt(inData, outData, length, &aesKey, iv, AES_ENCRYPT);

    string cipherText((const char*)outData, length);

    delete [] inData;
    delete [] outData;

    return cipherText;
}

// 解密函数
string decrypt(string cipherText, string key) {
    unsigned char iv[AES_BLOCK_SIZE] = {0};
    AES_KEY aesKey;
    if (AES_set_decrypt_key((const unsigned char*)key.c_str(), 128, &aesKey) < 0) {
        cerr << "Unable to set decryption key in AES." << endl;
        exit(1);
    }

    int length = cipherText.length();
    unsigned char* inData = new unsigned char[length];
    memset(inData, 0, length);
    memcpy(inData, cipherText.c_str(), length);

    unsigned char* outData = new unsigned char[length];
    memset(outData, 0, length);

    AES_cbc_encrypt(inData, outData, length, &aesKey, iv, AES_DECRYPT);

    string plainText((const char*)outData, length);

    delete [] inData;
    delete [] outData;

    return plainText;
}

int main() {
    string plainText = "Hello World!";
    string key = "0123456789abcdef";

    // 加密
    string cipherText = encrypt(plainText, key);
    cout << "Cipher text: " << cipherText << endl;

    // 解密
    string decryptedText = decrypt(cipherText, key);
    cout << "Decrypted text: " << decryptedText << endl;

    return 0;
}

需要注意的是，上面的代码使用了OpenSSL库中的AES加密和解密函数。在使用之前需要确保已经安装了OpenSSL库，并在编译时链接该库。