Re: error: redefinition of ‘struct rsa_meth_st’

[Dr Paul Dale <pauli@xxxxxxxxxxx>]

    You shouldn't be accessing the internal of a private structure. 
    That structure was made private for a reason and duplicating it in
    your engine will break when we change the structure's contents.
    
    Your engine should be using the EVP_PKEY_meth_set_* function to do
    what you want (for 1.1.1).  For 3.0, you should be writing a
    provider instead.
    
    
    Pauli

On 12/4/21 5:04 am, Shariful Alam wrote:

Hello,

Hope you guys are doing well. I'm trying to develop an RSA engine. My engine was somewhat working until I try to integrate my engine with an apache httpd server. After installing the httpd from the source code, it turns out that, I can't compile my engine anymore. I get the following error while I try to compile (it was compiling before and I did not make any changes to my engine code).

==============================

$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;

=============================

and my struct rsa_meth_st looks like the following,

================================================================================

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, const unsigned char *from, unsigned char *to, RSA *rsa, int padding);
    int (*rsa_priv_enc) (int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding);
    int (*rsa_priv_dec) (int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding);

    int (*rsa_mod_exp) (BIGNUM *r0, const BIGNUM *I, RSA *rsa, 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 *m, unsigned int m_length, const unsigned char *sigbuf, unsigned int siglen, const RSA *rsa);

    int (*rsa_keygen) (RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);

};

=================================================================================

My sample skeleton code is here https://pastebin.com/uNXYknEA

Can anyone please tell me what I'm I doing wrong?

Regards,

Shariful Alam