OpenSSL RSA_size with EVP_PKEY - c

Question

I have a question regarding RSA_size.
Version that crash on WIN32 but works on linux platforms :
...
EVP_PKEY* pPublicKey = null;
unsigned int uKeySize = 0;
const unsigned char *pData;
pData = a_publicKey->Key.Data; /* Key.Data = unsigned char *p containing the Key in a string version */
pPublicKey = d2i_PublicKey(EVP_PKEY_RSA, null, &pData, a_publicKey->Key.Length);
if(pPublicKey != null)
{
uKeySize = RSA_size(pPublicKey->pkey.rsa); //Crash
}
...
Version that work on win32 (not tested on linux but I suppose it works as well):
...
EVP_PKEY* pPublicKey = null;
RSA* pRsaPublicKey = null;
unsigned int uKeySize = 0;
const unsigned char *pData;
pData = a_publicKey->Key.Data; /* Key.Data = unsigned char *p containing the Key in a string version */
pPublicKey = d2i_PublicKey(EVP_PKEY_RSA, null, &pData, a_publicKey->Key.Length);
if(pPublicKey != null)
{
pRsaPublicKey = EVP_PKEY_get1_RSA(pPublicKey);
EVP_PKEY_free(pPublicKey);
uKeySize = RSA_size(pRsaPublicKey);
}
...
I do not understand why the first version crash. But when I look into the pkey.rsa structure, values are not the same as in the RSA pointer in the 2nd version.
Any ideas ?

Answer 1

I looked into EVP_PKEY struct and it seems that WIN32 and linux version are different...
So I guess i am using a really old one for my WIN32.
WIN32 version :
struct evp_pkey_st
{
int type;
int save_type;
int references;
union {
char *ptr;
#ifndef OPENSSL_NO_RSA
struct rsa_st *rsa; /* RSA */
#endif
#ifndef OPENSSL_NO_DSA
struct dsa_st *dsa; /* DSA */
#endif
#ifndef OPENSSL_NO_DH
struct dh_st *dh; /* DH */
#endif
#ifndef OPENSSL_NO_EC
struct ec_key_st *ec; /* ECC */
#endif
} pkey;
int save_parameters;
STACK_OF(X509_ATTRIBUTE) *attributes; /* [ 0 ] */
} /* EVP_PKEY */;
linux :
struct evp_pkey_st
{
int type;
int save_type;
int references;
const EVP_PKEY_ASN1_METHOD *ameth;
ENGINE *engine;
union {
char *ptr;
#ifndef OPENSSL_NO_RSA
struct rsa_st *rsa; /* RSA */
#endif
#ifndef OPENSSL_NO_DSA
struct dsa_st *dsa; /* DSA */
#endif
#ifndef OPENSSL_NO_DH
struct dh_st *dh; /* DH */
#endif
#ifndef OPENSSL_NO_EC
struct ec_key_st *ec; /* ECC */
#endif
} pkey;
int save_parameters;
STACK_OF(X509_ATTRIBUTE) *attributes; /* [ 0 ] */
} /* EVP_PKEY */;