Function nginx::EVP_PKEY_meth_set_derive

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