MD5以512位分组来处理输入的信息，且每一分组又被划分为16个32位子分组，经过了一系列的处理后，算法的输出由四个32位分组组成，将这四个32位分组级联后将生成一个128位散列值-MD5　deal with the information entered, and each group was divided into 16 groups of 32 seats, after a series of processing, the output of the algorithm consists of four groups composed of 32, these four 32 generates a 128-bit hash value will cascade grouping