RSA加解密，c语言实现

加密代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>

int main() {
    // 读取公钥
    FILE *publicKeyFile = fopen("public_key.pem", "r");
    if (publicKeyFile == NULL) {
        printf("无法打开公钥文件\n");
        return -1;
    }
    RSA *publicKey = PEM_read_RSA_PUBKEY(publicKeyFile, NULL, NULL, NULL);
    fclose(publicKeyFile);
    if (publicKey == NULL) {
        printf("无法读取公钥\n");
        return -1;
    }

    // 读取待加密的文件内容
    FILE *inputFile = fopen("test.txt", "rb");
    if (inputFile == NULL) {
        printf("无法打开输入文件\n");
        return -1;
    }
    fseek(inputFile, 0, SEEK_END);
    long fileSize = ftell(inputFile);
    fseek(inputFile, 0, SEEK_SET);
    unsigned char *fileContent = malloc(fileSize);
    fread(fileContent,