我最近在我的C ++项目中一直在使用openssl库,但遇到了我自己无法解决的问题。
我实际上是试图加载存储在文件中的RSA公钥并加密64个字节。当我的代码使用通过函数RSA_generate_key生成的公共密钥时,它可以工作,但是当我使用自己的公共密钥时,由于某种原因,它将不再起作用。
我怀疑是来自pkcs1 pkcs8的密钥格式,尝试了PEM_read_RSAPublicKey和PEM_read_RSA_PUBKEY,但由于某些原因仍无法使用...
这是我的公共密钥:
-----BEGIN RSA PUBLIC KEY-----
MEYCQQDE91cW7INdIyVon5H/he2b/DIR25wWT0GFLiZOVp0oAgCAVKDvRZ5+Pqu4
f65XbnNUNNHRJLMLEb1t4JgUhgFVAgER
-----END RSA PUBLIC KEY-----
来自Openssl库的RSA_generate_key函数的密钥,正在运行:
-----BEGIN RSA PUBLIC KEY-----
MEYCQQDsg/4Qm153/Pr8JRruC0SnVvTrWg/lIPheezIpkwVeWjNz9lMDXNUjdK8v
QgfNUCRJYbnxYIeruAdwTzS/bDXbAgER
-----END RSA PUBLIC KEY-----
这是我的代码:
RSA.h:
#include <iostream>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <string>
#ifndef RSA_ALGORITHM_H
#define RSA_ALGORITHM_H
#define KEY_LENGTH 512
#define PUBLIC_EXPONENT 17
#define PUBLIC_KEY_PEM 1
#define PRIVATE_KEY_PEM 0
#define LOG(x) \
std::cout << x << std::endl; \
/*
* @brief create_RSA function creates public key and private key file
*
*/
RSA* create_RSA(RSA* keypair, int pem_type, char* file_name);
/*
* @brief public_ecrypt function encrypts data.
* @return If It is fail, return -1
*/
int public_encrypt(int flen, unsigned char* from, unsigned char* to, RSA* key, int padding);
/*
* @brief private_decrypt function decrypt data.
* @return If It is fail, return -1
*/
int private_decrypt(int flen, unsigned char* from, unsigned char* to, RSA* key, int padding);
/*
* @brief create_ecrypted_file function creates .bin file. It contains encrypted data.
*/
void create_encrypted_file(char* encrypted, RSA* key_pair);
#endif //RSA_ALGORITHM_H
RSA.cpp:
#include "RSA.h"
#include <iostream>
#include <string.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <sstream>
#include <iomanip>
int public_encrypt(int flen, unsigned char* from, unsigned char* to, RSA* key, int padding) {
int result = RSA_public_encrypt(flen, from, to, key, padding);
return result;
}
void create_encrypted_file(char* encrypted, RSA* key_pair) {
FILE* encrypted_file = fopen("encrypted_file.bin", "w");
fwrite(encrypted, sizeof(*encrypted), RSA_size(key_pair), encrypted_file);
fclose(encrypted_file);
}
RSA* createRSA(int pem_type, char* file_name) {
RSA* rsa = NULL;
FILE* fp = NULL;
if (pem_type == PUBLIC_KEY_PEM) {
fp = fopen(file_name, "rb");
PEM_read_RSAPublicKey(fp, &rsa, NULL, NULL);
fclose(fp);
}
else if (pem_type == PRIVATE_KEY_PEM) {
fp = fopen(file_name, "rb");
PEM_read_RSAPrivateKey(fp, &rsa, NULL, NULL);
fclose(fp);
}
return rsa;
}
int main() {
LOG("RSA has been started.");
char public_key_pem[11] = "public_key";
RSA* public_key = createRSA(PUBLIC_KEY_PEM, public_key_pem);
LOG("Public key pem file has been created.");;
char message[KEY_LENGTH] = "\xc8\xcd\x21\x74\xb9\x84\x33\xb9\x30\x94\xb3\x60\x26\xde\x12\x5a\x7f\x5e\xd8\x5e\xc2\x7e\xe6\xbb\x9e\x99\x6c\xb3\xb9\x38\xe9\xc6\x23\x8c\xc6\x5d\x36\x15\xfb\x63\x5f\x6f\x08\x0f\x6d\xda\x06\x31\x59\x28\xbc\xae\x4c\xcf\x80\x2f\x96\x80\x54\x7d\xb5\x7b\x82\x83";
char* encrypt = NULL;
LOG(KEY_LENGTH);
LOG(PUBLIC_EXPONENT);
encrypt = (char*)malloc(RSA_size(public_key));
int encrypt_length = public_encrypt(RSA_size(public_key), (unsigned char*)message, (unsigned char*)encrypt, public_key, RSA_NO_PADDING);
if (encrypt_length == -1) {
LOG("An error occurred in public_encrypt() method");
}
LOG("Data has been encrypted.");
create_encrypted_file(encrypt, public_key);
LOG("Encrypted file has been created.");
free(public_key);
free(encrypt);
LOG("RSA has been finished.");
return 0;
}
尽管该帖子与我的问题极为相似,但我已经看了很多帖子,也没有找到任何解决方法
该错误实际上与数学相关。密钥和代码均未引起问题。如果您更改密钥或要加密的数据,出于某种原因,它将可以正常工作。因此,我认为在RSA计算期间发生了一些事情,但还不足以找出原因。