pub unsafe extern "C" fn EVP_PKEY_CTX_get_cb(
ctx: *mut evp_pkey_ctx_st,
) -> Option<unsafe extern "C" fn(_: *mut evp_pkey_ctx_st) -> i32>
pub unsafe extern "C" fn EVP_PKEY_CTX_get_cb(
ctx: *mut evp_pkey_ctx_st,
) -> Option<unsafe extern "C" fn(_: *mut evp_pkey_ctx_st) -> i32>