EVP_PKEY_size
#define EVP_PKEY_get_size EVP_PKEY_size
*sig_len = EVP_PKEY_size(pkey);
slen = EVP_PKEY_size(key->pkey);
modlen = EVP_PKEY_size(key->pkey);
rsasize = EVP_PKEY_size(key->pkey);
slen = EVP_PKEY_size(pkey);
reslen = EVP_PKEY_size(pkey);