def generate(self,key,question_answers,title,content):
# The encrypt key is generated as follows:
# 1. Sort all Q&A answers.
# 2. Join all Q&A answers with ";".
# 3. HMAC the result with given key.
# Text being encrypted is combined with content and time,
# in a way that is human-friendly.
# The question, the encrypt key's hash are stored together
# with ciphertext, so that it's easy to verify user's input
# without attempted decrytion.
enckey = self._calculate_key(key,question_answers)
timestamp = time.strftime("%a, %d %b %Y %H:%M:%S", time.gmtime())
content = "%s\n\n%s" % (timestamp,content)
title = formatTitle(title)
ciphertext = x(enckey).encrypt(content)
integrity_check = self._calculate_integrity(enckey,
ciphertext,
title)
constructed = {
'key': Hash('md5',enckey).hexdigest(),
'questions': question_answers.keys(),
'title': title,
'content': ciphertext.encode('base64').replace('\n',''),
'integrity': integrity_check
}
return json.dumps(constructed,indent=4)
def listkeys(dpath,gkey):
l = os.listdir(dpath)
ret = {}
for each in l:
fpath = os.path.join(dpath,each)
try:
fkey = x(gkey).decrypt(open(fpath,'r').read())
except:
continue
ret[each] = fkey
return ret
def read(self,key_callback,qa_callback):
key = str(key_callback(u'请输入解密密钥/Enter decrypting key:'))
qa = dict(qa_callback(u'请回答这些问题/Answer these questions:',self.questions))
enckey = self._calculate_key(key,qa)
if Hash('md5',enckey).hexdigest() != self.keyhash:
print '密码错误或问题回答错误 / Incorrect key or answers'
return False
if self.integrity_check != self._calculate_integrity(enckey,
self.ciphertext,
self.title):
print '内容完整性校验失败 可能文件已经被篡改 / Integrity check failed This file may have been altered'
return False
try:
return x(enckey).decrypt(self.ciphertext)
except:
return False
def handler(gkey,dpath,epath):
title, content, qas = '','',{}
while True:
s = e(title,content,qas)
s.showDialog()
result = s.result
if result != None:
# Do a confirm
title = formatTitle(result['title'])
content = str(result['content'])
qas = dict(result['qas'])
clearScreen()
if (not title) or (not content):
print '标题或内容有误'
continue
print '即将记录如下信息：'
print '标题 %s' % title.encode('utf-8')
print '问答'
for q in qas:
print " * [%s] %s" % (q,qas[q])
print '内容\n%s' % content
print '--------'
cmd = raw_input('<Enter>:重新修改 s+<Enter>:保存 其他:取消').strip().lower()
if cmd == 's':
break
elif cmd == '':
continue
else:
return
else:
return
# Save
savekey = randkey(128)
open(os.path.join(dpath,title),'w+').write(x(gkey).encrypt(savekey))
doc = docformat.EncryptedFile()
plaintext = doc.generate(savekey,qas,title,content)
open(os.path.join(epath,title),'w+').write(plaintext)
raw_input('保存完毕，按任意键返回')
