EVP_MD_CTX_get_size_ex
int EVP_MD_CTX_get_size_ex(const EVP_MD_CTX *ctx);
#define EVP_MD_CTX_get_size(e) EVP_MD_CTX_get_size_ex(e)
#define EVP_MD_CTX_size EVP_MD_CTX_get_size_ex
