[英]Overflow Exception when encrypting message with python-rsa
我正在使用Python 3和Python-rsa( https://stuvel.eu/rsa ),并且在加密消息时始终出现相同的错误:
> Traceback (most recent call last):
``File "client.py", line 65, in <module>
msgg = encrypt_text(pubkey, msg)
File "client.py", line 54, in encrypt_text
return rsa.encrypt(msg.encode(), pubkey)
File "C:\Users\N0t_an_admin\AppData\Local\Programs\Python\Python36-32\lib\s
-packages\rsa\pkcs1.py", line 170, in encrypt
padded = _pad_for_encryption(message, keylength)
File "C:\Users\N0t_an_admin\AppData\Local\Programs\Python\Python36-32\lib\s
-packages\rsa\pkcs1.py", line 87, in _pad_for_encryption
' space for %i' % (msglength, max_msglength))
OverflowError: 1 bytes needed for message, but there is only space for -10
码:
def get_server_pub():
pubkey = listener("serverpub").decode("utf-8")
pubkey = pubkey.strip(";")
xd = rsa.PublicKey(n= int(pubkey[0]), e= int(pubkey[1]))
return xd
def encrypt_text(pubkey, msg):
return rsa.encrypt(msg.encode(), pubkey)
if __name__ == '__main__':
print("Hello")
if os.path.isfile('ckeys.json') == False:
keys = createkeys()
write_to_json_file('ckeys.json', keys)
pubkey = get_server_pub()
while True:
msg = input("Message: ")
msgg = encrypt_text(pubkey, msg)
recived = listener(msgg)
if not recived:
continue
print(recived)
该文件说:
OverflowError –当消息太大而无法填充页面时。
检查该库的代码,应归咎于这一部分
def _pad_for_encryption(message, target_length):
r"""Pads the message for encryption, returning the padded message.
:return: 00 02 RANDOM_DATA 00 MESSAGE
>>> block = _pad_for_encryption(b'hello', 16)
>>> len(block)
16
>>> block[0:2]
b'\x00\x02'
>>> block[-6:]
b'\x00hello'
"""
max_msglength = target_length - 11
msglength = len(message)
if msglength > max_msglength:
raise OverflowError('%i bytes needed for message, but there is only'
' space for %i' % (msglength, max_msglength))
那个方法叫做这里
keylength = common.byte_size(pub_key.n)
padded = _pad_for_encryption(message, keylength)
似乎密钥长度计算不正确,因此maxlength为-10。 检查您是否正在获取公用密钥。
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