Function nginx::EVP_PKEY_meth_set_sign

pub unsafe extern "C" fn EVP_PKEY_meth_set_sign(
    pmeth: *mut EVP_PKEY_METHOD, 
    sign_init: Option<unsafe extern "C" fn(ctx: *mut EVP_PKEY_CTX) -> c_int>, 
    sign: Option<unsafe extern "C" fn(ctx: *mut EVP_PKEY_CTX, sig: *mut c_uchar, siglen: *mut size_t, tbs: *const c_uchar, tbslen: size_t) -> c_int>
)