sha-512,sha-256,等的C实现,内附

官方参考和整理参考.包括最流行的md5

算法源码 sha512是最新版本的美国国家安全局所设计的算法.本代码支持任意大小的字符串或文件(<2GB,可以改到4GB,8GB...).-sha-512, sha-256, such as the C to achieve, enclosing the official reference and collate reference. including the most popular source md5 algorithm sha512 is the latest version of the U.S. National Security Agency designed algorithms. this code to support any size of string or document (<2GB, can be changed to a 4GB, 8GB ...).