生成的密钥对进行加解密、签名和效验

生成对应的私钥和公钥

#include<iostream>
#include<openssl/sha.h>
#include<openssl/rsa.h>
#include<openssl/pem.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#include<string>

extern "C"
{
   
   // #include<openssl/
}

using namespace std;

void rsaTest()
{
   
   RSA* rsa = RSA_new();
   BIGNUM* e = BN_new();
   int ret = BN_set_word(e, 12345);
   ret = RSA_generate_key_ex(rsa, 1024, e, NULL);

   // write privatek key to dis
   BIO* bio = BIO_new_file("private2.pem", "w");
   PEM_write_bio_RSAPrivateKey(bio, rsa, NULL, NULL, 0, NULL, NULL);
   BIO_free(bio);

   bio = BIO_new_file("public2.pem", "w");
   PEM_write_bio_RSAPublicKey(bio, rsa);
   BIO_free(bio);

   FILE* fd = fopen("pbulic.pem", "w");
   if (fd == NULL)
   {
   
      perror("file");
   }
   
   ret = PEM_write_RSAPublicKey(fd, rsa);
   fclose(fd);

   fd = fopen("private.pem", "w"