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random.lua
-- 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 = '0.17' } ffi.cdef[[ int RAND_bytes(unsigned char *buf, int num); int RAND_pseudo_bytes(unsigned char *buf, int num); ]] function _M.bytes(len, strong) if strong == nil then strong = true end 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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