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'''
使用方法：python md5Crack.py "你要碰撞的字符串" 字符串的起始位置
例如：python md5Crack.py “0e" 0
将产生MD5值为0e开头的字符串。
'''
import multiprocessing
import hashlib
import random
import string
import sys
CHARS = string.letters + string.digits
def cmp_md5(substr, stop_event, str_len,start=0, size=20):
global CHARS
while not stop_event.is_set():
rnds = ''.join(random.choice(CHARS) for _ in range(size))
md51 = hashlib.md5(rnds)
value1 = md51.hexdigest()
if value1[start: start+str_len] == substr:
'''
#碰撞单MD5
print rnds
stop_event.set()
'''
'''
#碰撞双md5
md52 = hashlib.md5(value1)
if md52.hexdigest()[start: start+str_len] == substr:
print rnds+ "=>" + value1+"=>"+ md52.hexdigest() + "\n"
stop_event.set()
'''
md52 = hashlib.md5(value1)
value2 = md52.hexdigest()
if value2[start: start + str_len] == substr:
md53 = hashlib.md5(value2)
if md53.hexdigest()[start: start + str_len] == substr:
print rnds + "=>" + value1 + "=>" +value2+"=>"+ md53.hexdigest() + "\n"
stop_event.set()
if __name__ == '__main__':
substr = sys.argv[1].strip()
start_pos = int(sys.argv[2]) if len(sys.argv) > 1 else 0
str_len = len(substr)
cpus = multiprocessing.cpu_count()
stop_event = multiprocessing.Event()
processes = [multiprocessing.Process(target=cmp_md5, args=(substr,
stop_event, str_len, start_pos))
for i in range(cpus)]
for p in processes:
p.start()
for p in processes:
p.join()
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