pub unsafe extern "C" fn EVP_PKEY_meth_get_signctx(
pmeth: *const evp_pkey_method_st,
psignctx_init: *mut Option<unsafe extern "C" fn(*mut evp_pkey_ctx_st, *mut evp_md_ctx_st) -> i32>,
psignctx: *mut Option<unsafe extern "C" fn(*mut evp_pkey_ctx_st, *mut u8, *mut usize, *mut evp_md_ctx_st) -> i32>,
)