mdigest提供了不同信息摘要算法的接口，如MD2, MD4, MD5, SHA, SHA1, SHA256, SHA384-It provides a common interface to different message digest algorithms，such as MD2, MD4, MD5, SHA, SHA1, SHA256, SHA384

包含了 sha1 sha256 sha384 sha512 算法的代码， 其中还有测试用例-includes sha1 sha256 sha384 sha512 algorithmic， and includes test case.

利用verilog实现的SHA1以及SHA2中的SHA256和SHA512-Use verilog to achieve the SHA1 and SHA256 and SHA512 SHA2