SHA 加密算法标准说明文件， 详细介绍相关的算法

关于SHA系列散列算法标准说明文档，对于每个操作做有详细的说明，另外加入了例子说明。-SHA hash algorithm on the series of standard documents, so for each operation is described in detail, while adding the example.

Good pdf to analysis the steps of SHA-1 Hash function