def grouped_pad(string): """对字符串进行填充，然后按512bit进行分组 返回分组的结果 """ string = binascii.b2a_hex(string) # 转化为16进制 bin = base.hex_bin(string) # 转化为二进制 #print bin #print len(bin) length_pad = base.dec_bin(len(bin), 64) # 最后填充的消息本身长度 #print length_pad mod = len(bin) % 512 #print mod if mod == 0: bin += '1' # 填1位'1' bin += '0' * 511 # 填511位'0' bin += length_pad #最好的bits数小于448 else: bin += '1' # 填1位'1' bin += '0' * (447-mod) # 填448 - 1 - mod位'0' bin += length_pad # 填充信息的二进制长度 grouped = [] i = 0 while i+512 <= len(bin): grouped.append(bin[i:i+512]) i += 512 return grouped
def grouped_pad(string):
"""对字符串进行填充，然后按512bit进行分组
返回分组的结果
"""
string = binascii.b2a_hex(string) # 转化为16进制
bin = base.hex_bin(string) # 转化为二进制
#print bin
#print len(bin)
length_pad = base.dec_bin(len(bin), 64) # 最后填充的消息本身长度
#print length_pad
mod = len(bin) % 512
#print mod
if mod == 0:
bin += '1' # 填1位'1'
bin += '0' * 511 # 填511位'0'
bin += length_pad
#最好的bits数小于448
else:
bin += '1' # 填1位'1'
bin += '0' * (447 - mod) # 填448 - 1 - mod位'0'
bin += length_pad # 填充信息的二进制长度
grouped = []
i = 0
while i + 512 <= len(bin):
grouped.append(bin[i:i + 512])
i += 512
return grouped
def expand(group): """将每个512分组再进行分组，并扩展到80个小分组 """ words = [] for i in range(0, 512, 32): words.append(group[i:i+32]) #print words for i in range(16, 80): temp = int(words[i-3],2) ^ int(words[i-8],2) ^ int(words[i-14], 2) ^ int(words[i-16], 2) # 异或 temp = base.dec_bin(temp, 32) # 获得二进制 temp = base.circle_left_shift(temp, 1) # 循环左移一位 words.append(temp) #print len(words) return words
def expand(group):
"""将每个512分组再进行分组，并扩展到80个小分组
"""
words = []
for i in range(0, 512, 32):
words.append(group[i:i + 32])
#print words
for i in range(16, 80):
temp = int(words[i - 3], 2) ^ int(words[i - 8], 2) ^ int(
words[i - 14], 2) ^ int(words[i - 16], 2) # 异或
temp = base.dec_bin(temp, 32) # 获得二进制
temp = base.circle_left_shift(temp, 1) # 循环左移一位
words.append(temp)
#print len(words)
return words
