SSH中的Python密码学AES-CTR

Question

现在，我试图（出于教育原因）尝试实施SSH实施，并试图正确获得AES-CTR模式。我将使用Scapy与密码学一起使用。我知道我的明文是正确的，因为它在CBC模式下起作用，并且在CTR上保持不变。

但是，当我加密和解密第一个数据包时，服务器可以由服务器处理，但是之后的所有内容都是错误的。我很确定我的错误在IV（计数器）范围的某个地方，但我无法理解。 我需要自己递增静脉注射吗？我尝试了，它没有用:(

from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes


class _SSH_Streamcipher:
    def __init__(self, key, iv, algorithm, mode, block_length=None, key_length=None):
        self.algorithm = algorithm
        self.mode = mode
        self.block_length = block_length
        self.key_length = key_length
        self.key = key[:self.key_length]
        self.iv = iv[:self.block_length]
        self._cipher = Cipher(self.algorithm(self.key), self.mode(self.iv))

        # for stream ciphers and aes with ctr mode we need both of them the whole time
        self.decryptor = None
        self.encryptor = None

    def encrypt(self, data: bytes) -> bytes:
        if self.encryptor is None:
            self.encryptor = self._cipher.encryptor()
        ciphertext = self.encryptor.update(data)
        return ciphertext

    def decrypt(self, data: bytes) -> bytes:
        if self.decryptor is None:
            self.decryptor = self._cipher.decryptor()
        ciphertext = self.decryptor.update(data)
        return ciphertext

class SSH_Cipher_AES_256_CTR(_SSH_Streamcipher):
    def __init__(self, key, iv):
        super(SSH_Cipher_AES_256_CTR, self).__init__(key, iv,
                                                     algorithm=algorithms.AES,
                                                     mode=modes.CTR,
                                                     block_length=16, key_length=32)

Answer 1

几个小时后我自己回答的问题。整体布局的错误实施