SHA_1算法填充部分的VHDL实现，让输入的数据可以转换为SHA_1算法所需要的512bit的数据-SHA_1 algorithm filling part of the VHDL realization, let the input data can be converted to SHA_1 algorithm need 512 bit data

sha_1加密运算模块，运算速率100Mbps，规格512位请大家参考-encryption algorithms sha_1 module, computing rate of 100Mbps, the specifications please refer to 512