MD5的全称是Message-digest Algorithm 5（信息-摘要算法），用于确保信息传输完整一致。在90年代初由MIT Laboratory for Computer Science和RSA Data Security Inc,的Ronald L. Rivest开发出来，经MD2、MD3和MD4发展而来。它的作用是让大容量信息在用数字签名软件签署私人密钥前被"压缩"成一种保密的格式（就是把一个任意长度的字节串变换成一定长的大整数）。-The full name of MD5 is

This file contains a fast, not so accurate integer implementation of the forward DCT (Discrete Cosine Transform) for Linux.

This file contains a slow-but-accurate integer implementation of the forward DCT (Discrete Cosine Transform) for Linux.

一组转换函数用于十六进制字符串二进制字符串八进制字符串到十进制整数相互转换(A set of transition function for hexadecimal string octal binary string string to a decimal integer transform each other)