def extlen(self,orghash,msglen,imsg):
hs = struct.unpack(">IIIII",orghash.decode('hex'))
self.h0 = hs[0]
self.h1 = hs[1]
self.h2 = hs[2]
self.h3 = hs[3]
self.h4 = hs[4]
self.mesg = imsg
tempmsg = c28.padding(msglen)+imsg
self.lmsg = msglen + len(tempmsg)
return tempmsg
def extlen(self, orghash, msglen, imsg):
# 按照给定的格式(>IIIII)解析字节流string，返回解析出来的tuple
hs = struct.unpack(">IIIII", orghash.decode('hex'))
#更改加密算法的初始值
self.h0 = hs[0]
self.h1 = hs[1]
self.h2 = hs[2]
self.h3 = hs[3]
self.h4 = hs[4]
self.mesg = imsg
tempmsg = c28.padding(msglen) + imsg # 计算出一个填充值使得 key + message + padding == 512 bits 的整数倍
self.lmsg = msglen + len(tempmsg)
return tempmsg