Re: error: redefinition of ‘struct rsa_meth_st’

[Dr Paul Dale]

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 
> <https://pastebin.com/uNXYknEA>
>
> Can anyone please tell me what I'm I doing wrong?
>
> Regards,
> Shariful Alam

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