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-- Copyright (C) by Yichun Zhang (agentzh)
local ffi = require "ffi"
local ffi_new = ffi.new
local ffi_str = ffi.string
local C = ffi.C
--local setmetatable = setmetatable
--local error = error
local _M = { _VERSION = '0.11' }
ffi.cdef[[
int RAND_bytes(unsigned char *buf, int num);
int RAND_pseudo_bytes(unsigned char *buf, int num);
]]
function _M.bytes(len, strong)
local buf = ffi_new("char[?]", len)
if strong then
if C.RAND_bytes(buf, len) == 0 then
return nil
end
else
C.RAND_pseudo_bytes(buf,len)
end
return ffi_str(buf, len)
end
return _M
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