Function nginx::EVP_PKEY_meth_get_derive

pub unsafe extern "C" fn EVP_PKEY_meth_get_derive(
    pmeth: *mut EVP_PKEY_METHOD, 
    pderive_init: *mut Option<unsafe extern "C" fn(ctx: *mut EVP_PKEY_CTX) -> c_int>, 
    pderive: *mut Option<unsafe extern "C" fn(ctx: *mut EVP_PKEY_CTX, key: *mut c_uchar, keylen: *mut size_t) -> c_int>
)