How to use the pproxy.cipher.AES_256_CFB_Cipher function in pproxy

KEY_LENGTH = 32
    IV_LENGTH = 8
    def setup(self):
        from Crypto.Cipher import Salsa20
        self.cipher = Salsa20.new(key=self.key, nonce=self.iv)

class AES_256_CFB_Cipher(BaseCipher):
    KEY_LENGTH = 32
    IV_LENGTH = 16
    SEGMENT_SIZE = 128
    def setup(self):
        from Crypto.Cipher import AES
        self.cipher = AES.new(self.key, AES.MODE_CFB, iv=self.iv, segment_size=self.SEGMENT_SIZE)
class AES_128_CFB_Cipher(AES_256_CFB_Cipher):
    KEY_LENGTH = 16
class AES_192_CFB_Cipher(AES_256_CFB_Cipher):
    KEY_LENGTH = 24

class AES_256_CFB8_Cipher(AES_256_CFB_Cipher):
    SEGMENT_SIZE = 8
class AES_192_CFB8_Cipher(AES_256_CFB8_Cipher):
    KEY_LENGTH = 24
class AES_128_CFB8_Cipher(AES_256_CFB8_Cipher):
    KEY_LENGTH = 16

class AES_256_OFB_Cipher(BaseCipher):
    KEY_LENGTH = 32
    IV_LENGTH = 16
    def setup(self):
        from Crypto.Cipher import AES
        self.cipher = AES.new(self.key, AES.MODE_OFB, iv=self.iv)
class AES_192_OFB_Cipher(AES_256_OFB_Cipher):

from Crypto.Cipher import Salsa20
        self.cipher = Salsa20.new(key=self.key, nonce=self.iv)

class AES_256_CFB_Cipher(BaseCipher):
    KEY_LENGTH = 32
    IV_LENGTH = 16
    SEGMENT_SIZE = 128
    def setup(self):
        from Crypto.Cipher import AES
        self.cipher = AES.new(self.key, AES.MODE_CFB, iv=self.iv, segment_size=self.SEGMENT_SIZE)
class AES_128_CFB_Cipher(AES_256_CFB_Cipher):
    KEY_LENGTH = 16
class AES_192_CFB_Cipher(AES_256_CFB_Cipher):
    KEY_LENGTH = 24

class AES_256_CFB8_Cipher(AES_256_CFB_Cipher):
    SEGMENT_SIZE = 8
class AES_192_CFB8_Cipher(AES_256_CFB8_Cipher):
    KEY_LENGTH = 24
class AES_128_CFB8_Cipher(AES_256_CFB8_Cipher):
    KEY_LENGTH = 16

class AES_256_OFB_Cipher(BaseCipher):
    KEY_LENGTH = 32
    IV_LENGTH = 16
    def setup(self):
        from Crypto.Cipher import AES
        self.cipher = AES.new(self.key, AES.MODE_OFB, iv=self.iv)
class AES_192_OFB_Cipher(AES_256_OFB_Cipher):
    KEY_LENGTH = 24
class AES_128_OFB_Cipher(AES_256_OFB_Cipher):
    KEY_LENGTH = 16

class Salsa20_Cipher(BaseCipher):
    KEY_LENGTH = 32
    IV_LENGTH = 8
    def setup(self):
        from Crypto.Cipher import Salsa20
        self.cipher = Salsa20.new(key=self.key, nonce=self.iv)

class AES_256_CFB_Cipher(BaseCipher):
    KEY_LENGTH = 32
    IV_LENGTH = 16
    SEGMENT_SIZE = 128
    def setup(self):
        from Crypto.Cipher import AES
        self.cipher = AES.new(self.key, AES.MODE_CFB, iv=self.iv, segment_size=self.SEGMENT_SIZE)
class AES_128_CFB_Cipher(AES_256_CFB_Cipher):
    KEY_LENGTH = 16
class AES_192_CFB_Cipher(AES_256_CFB_Cipher):
    KEY_LENGTH = 24

class AES_256_CFB8_Cipher(AES_256_CFB_Cipher):
    SEGMENT_SIZE = 8
class AES_192_CFB8_Cipher(AES_256_CFB8_Cipher):
    KEY_LENGTH = 24
class AES_128_CFB8_Cipher(AES_256_CFB8_Cipher):
    KEY_LENGTH = 16

class AES_256_OFB_Cipher(BaseCipher):
    KEY_LENGTH = 32
    IV_LENGTH = 16
    def setup(self):
        from Crypto.Cipher import AES