invalid use of incomplete type ‘RSA {aka struct rsa_st}’

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If you are compiling code that use old openssl lib(such as openssl 1.0.2) with the latest openssl lib such as openssl 1.1.0, you will meet this error:

invalid use of incomplete type ‘RSA {aka struct rsa_st}’

In old openssl lib, you can set the modulus, public exponent, and private exponent of a RSA structure as follows:

 BIGNUM *bnn, *bne, *bnd;
 bnn = BN_new();
 bne = BN_new();
 bnd = BN_new();

 BN_hex2bn(&bnn, MODULUS);
 BN_set_word(bne, PUBLIC_EXPONENT);
 BN_hex2bn(&bnd, PRIVATE_EXPONENT);            

RSA *r = RSA_new();
r->n = bnn;
r->e = bne;
r->d = bnd;

However, after porting to the new openssl lib, you should set the n,e,d of a RSA struct using the RSA_set0_key function:

RSA_set0_key(r,bnn,bne,bnd);

Similarly,  you should get the n,e,d components of RSA using RSA_get0_key.

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