用c语言实现的des算法，速度经过优化，适合没有硬加密的场合。

基于ARM SOC的多媒体音频算法软件优化及系统设计-In this thesis，the research and development ofa real-time high performance high precision MP3 software decoder for SOC with ARM7TDMI as core processor is presented．黜decoder c∞widely used in handheld devices such∞pocket