进行RSA加密然后在AES密钥上解密的奇数错误

以下代码

    key = sec.generateAESKey()
    print(key, ': ', len(key))
    
    key = b64encode(key)
    print(key, ': ', len(key))
    
    key = sec.encryptAsymmetric(str(key))
    key = sec.decryptAsymmetric(key)
    print(key, ': ', len(key))
    
    key = b64decode(key)
    print(key, ': ', len(key))

输出

b'\ xae \ xfe \ x8b \ xb8 \ xbe \ x86 = \ xe8 \ x979 / @ \ xf58 \ xf9 \ x95'：16

b'rv6LuL6GPeiXOS9A9Tj5lQ =='：24

b'rv6LuL6GPeiXOS9A9Tj5lQ =='：27

b'n \ xbb \ xfa。\ xe2 \ xfa \ x18 \ xf7 \ xa2 \\ xe4 \ xbd \ x03 \ xd4 \ xe3 \ xe6T'：17

如您所见，非对称加密和解密出了点问题，因为密钥在b64decoding之前获得了3个字节，在b64decoding之后获得了1个字节

基本功能是：

from Cryptodome.PublicKey import RSA
from Cryptodome.Cipher import PKCS1_OAEP
from Cryptodome.Cipher import AES
from Cryptodome.Random import get_random_bytes
from Cryptodome.Hash import SHA256
from base64 import b64decode
from base64 import b64encode
import re

# important global vars, don't need to re-generate these
public_key_plain = open("public.pem").read()
public_key = RSA.import_key(public_key_plain)
private_key = RSA.import_key(open("private.pem").read())

# constants
KEY_SIZE = 16
AUTH_TOKEN_EXPIRY = 15 # minutes

# encrypt using our public key
# data should be in a string format
def encryptAsymmetric(data):
    # convert the data to utf-8
    data = data.encode("utf-8")
    # generate the cipher
    cipher = PKCS1_OAEP.new(public_key, hashAlgo=SHA256)
    # encrypt
    return b64encode(cipher.encrypt(data))

# decrypt some cipher text using our private key
def decryptAsymmetric(ciphertext):
    # generate the cipher
    cipher = PKCS1_OAEP.new(private_key, hashAlgo=SHA256)
    # decrypt
    return cipher.decrypt(b64decode(ciphertext)).decode()

# generates a key for aes
def generateAESKey():
    return get_random_bytes(KEY_SIZE)

上面产生此错误的代码是一些写在后端的单元测试的一部分。当客户端进行非对称加密而服务器进行解密时，这些功能可以正常工作。由于某种原因，它在这里失败了，但我不明白为什么。如果有人可以看到非对称加密和解密出了什么问题，以及为什么它更改了真正有用的密钥。提前致谢