错误：重新定义“struct rsa_meth_st”

编程问答 2022-05-14

问题描述

我正在尝试开发 RSA 引擎。在我尝试将我的引擎与 apache httpd 服务器集成之前，我的引擎有些工作。从源代码安装 httpd 后，事实证明，我无法再编译我的引擎代码。我在尝试编译时收到以下错误（之前正在编译，我没有对引擎代码进行任何更改）。

$gcc -fPIC -c r_engine.c
r_engine.c:29:8: error: redefinition of ‘struct rsa_meth_st’
struct rsa_meth_st {
    ^ 
In file included from /usr/include/openssl/crypto.h:131:0,from r_engine.c:7:
/usr/include/openssl/ossl_typ.h:147:16: note: originally defined here
typedef struct rsa_meth_st RSA_METHOD;

我的示例源代码如下，

#include <openssl/opensslconf.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/engine.h>
#include <openssl/rsa.h>
#include <openssl/bn.h>
#include <openssl/err.h>
#include <openssl/ossl_typ.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>


/* Declared in ossl_typ.h */
/* typedef struct rsa_meth_st RSA_METHOD; */

//#ifndef INCLUDE_OSSL_TYP_H
//#define INCLUDE_OSSL_TYP_H

struct rsa_meth_st {

const char *name;
int (*rsa_pub_enc) (int flen,const unsigned char *from,unsigned char *to,RSA *rsa,int padding);
int (*rsa_pub_dec) (int flen,int padding);
int (*rsa_priv_enc) (int flen,int padding);
int (*rsa_priv_dec) (int flen,int padding);
int (*rsa_mod_exp) (BIGNUM *r0,const BIGNUM *I,BN_CTX *ctx);
int (*bn_mod_exp) (BIGNUM *r,const BIGNUM *a,const BIGNUM *p,const BIGNUM *m,BN_CTX *ctx,BN_MONT_CTX *m_ctx);
int (*init) (RSA *rsa);
int (*finish) (RSA *rsa);
int flags;
char *app_data;
int (*rsa_sign) (int type,const unsigned char *m,unsigned int m_length,unsigned char *sigret,unsigned int *siglen,const RSA *rsa);
int (*rsa_verify) (int dtype,const unsigned char *sigbuf,unsigned int siglen,const RSA *rsa);
int (*rsa_keygen) (RSA *rsa,int bits,BIGNUM *e,BN_GENCB *cb);
};
//#endif


static int eng_rsa_pub_enc (int flen,RSA * rsa,int padding){
    printf ("Engine is encrypting using pub key \n");
}

static int eng_rsa_pub_dec (int flen,int padding){
    printf ("Engine is decrypting using pub key \n");
}

static int eng_rsa_priv_enc (int flen,int padding __attribute__ ((unused))){
    printf ("Engine is encrypting using priv key \n");
}

static int eng_rsa_priv_dec (int flen,unsigned char *from,int padding __attribute__ ((unused))){
    printf ("Engine is decrypting using priv key \n");
}

/* Constants used when creating the ENGINE */
static const char *engine_rsa_id = "r_engine";
static const char *engine_rsa_name = "Demo engine";

struct rsa_meth_st new_rsa =
    {
            "demo RSA Engine",eng_rsa_pub_enc,eng_rsa_pub_dec,eng_rsa_priv_enc,eng_rsa_priv_dec,NULL,RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_CACHE_PRIVATE,NULL
    };

static int bind (ENGINE * e,const char *id){
printf ("%s\n",id);

if (!ENGINE_set_id (e,engine_rsa_id) ||

    !ENGINE_set_name (e,engine_rsa_name) ||

    !ENGINE_set_RSA (e,&new_rsa))

    return 0;

return 1;

}

IMPLEMENT_DYNAMIC_BIND_FN (bind)
IMPLEMENT_DYNAMIC_CHECK_FN ()

我注意到，使用新版本的操作系统，我的代码编译和运行良好。 我知道 struct rsa_meth_st 是在 ossl_typ.h 文件中定义的，但之前没有抛出任何错误，但为什么现在？

我的 gcc version 是 gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609

解决方法

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copensslopenssl-enginestructstruct