在JAVA环境下sha_256的实现以及设计文档，无制作界面，在dos下运行-In the JAVA environment sha_256 realization and design documents, without making the interface, running in dos

JAVA消息摘要算法. 包含MD2,MD5,SHA1,SHA256,SHA384,SHA512-MessageDigest Util. contains MD2,MD5,SHA1,SHA256,SHA384,SHA512.

Sha256 Algorithm. The SHA hash functions are a set of cryptographic hash functions designed by the National Security Agency (NSA) and published by the NIST as a U.S. Federal Information Processing Standard. SHA stands for Secure Hash Algorithm