Re: error: redefinition of ‘struct rsa_meth_st’

[Shariful Alam]

Dr. Pauli,
Goodmorning. Thank you for replying. I found the documentation a bit
difficult for me to understand. I was wondering if you can direct me to a
sample skeleton code for creating a custom RSA engine.

Regards,
Shariful Alam

On Sun, Apr 11, 2021 at 6:00 PM Dr Paul Dale <pauli at openssl.org> wrote:

> 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,
>
>
> ================================================================================
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> *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
>
>
>
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