RSA会话密钥的RSA解密失败,出现"AttributeError:'bytes'对象没有属性'n' [英] RSA decryption of AES Session key fails with 'AttributeError: 'bytes' object has no attribute 'n'
问题描述
我正在从Python 3.6上的PyCryptodome实现公共密钥加密.当我尝试创建对称加密密钥并加密/解密变量时,一切正常.但是,当我介绍RSA(和PKCS1_OAEP)的那一刻,一切都变得很糟- session_key
可以很好地加密,但是当我尝试对其进行解密时,会出现以下错误:
I'm working on implementing a public key encryption from PyCryptodome on Python 3.6. When I try to create a symmetric encryption key and encrypt/decrypt variables, it all works fine. But the minute I introduce RSA (and PKCS1_OAEP), it all goes down the tubes - the session_key
encrypts fine but when I try and decrypt it, I get the following error:
Traceback (most recent call last):
File "enctest.py", line 109, in <module>
deckey = decrypt_val(enckey)
File "enctest.py", line 77, in decrypt_val
session_key = cipher.decrypt(ciphertext)
File "/usr/lib/python3.6/site-packages/Crypto/Cipher/PKCS1_OAEP.py", line 187, in decrypt
modBits = Crypto.Util.number.size(self._key.n)
AttributeError: 'bytes' object has no attribute 'n'
我的代码如下.谁能看看我告诉我我做错了吗?
My code is as follows. Can anyone take a look and tell me what I'm doing wrong?
from Crypto.Cipher import AES, PKCS1_OAEP
from Crypto.PublicKey import RSA
from Crypto import Random
from Crypto.Random import get_random_bytes
random_generator = Random.new().read
keys = RSA.generate(1024, random_generator)
pubkey = keys.publickey()
privkey = keys.exportKey()
pubcipher = PKCS1_OAEP.new(pubkey) # ciphertext = cipher.encrypt(message)
privcipher = PKCS1_OAEP.new(privkey) # message = cipher.decrypt(ciphertext)
privkeystr = keys.exportKey(format='PEM', passphrase=None, pkcs=1)
pubkeystr = keys.publickey().exportKey(format='PEM', passphrase=None, pkcs=1)
def encrypt_val(session_key, cipher = pubcipher):
try:
session_key = session_key.encode('utf8')
except:
pass
ciphertext = cipher.encrypt(session_key)
print("encrypted key : %s \n" % ciphertext)
return ciphertext
def decrypt_val(ciphertext, cipher = privcipher):
session_key = cipher.decrypt(ciphertext)
try:
session_key = session_key.decode('utf8')
except:
pass
return session_key
def aesenc(data):
try:
data = data.encode('utf8')
except:
pass
key = get_random_bytes(16)
cipher = AES.new(key, AES.MODE_EAX)
ciphertext, tag = cipher.encrypt_and_digest(data)
aesencdict = {'aesdict' : {'ciphertext' : ciphertext, 'tag' : tag, 'nonce' : cipher.nonce} , 'key' : key}
return(aesencdict)
def aesdec(aesdict, key):
cipher = AES.new(key, AES.MODE_EAX, aesdict['nonce'])
data = cipher.decrypt_and_verify(aesdict['ciphertext'], aesdict['tag'])
try:
data = data.decode('utf8')
except:
pass
return data
val = "hello"
encval = aesenc(val)
enckey = encrypt_val(encval['key'])
print(enckey)
deckey = decrypt_val(enckey)
print(deckey)
if deckey == encval['key']:
outval = aesdec(encval['aesdict'], encval['key'])
print(val, outval)
else:
print("oops\n")
推荐答案
似乎您进行了虚假导出,将密钥转换为密钥的 encoding :
It seems you do a spurious export, which translates a key into the encoding of a key:
privkey = keys.exportKey()
....
privcipher = PKCS1_OAEP.new(privkey) # message = cipher.decrypt(ciphertext)
之后,它尝试从编码键而不是从包含成员 n
的对象实例中找到模数 n
.
after which it tries to find the modulus n
from the encoded key instead of from the object instance that contains a member n
.
尝试:
privcipher = PKCS1_OAEP.new(keys)
相反.
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