首页 > 解决方案 > Rc4 解密 ValueError:“str”类型的对象的未知格式代码“x”

问题描述

当我到达代码中的以下行时,我收到以下错误:

inputString = "{:02x}".format(inputNumber)

ValueError:“str”类型的对象的未知格式代码“x”

我怎样才能避免这种情况?

# Global variables
state = [None] * 256
p = q = None

def setKey(key):
    ##RC4 Key Scheduling Algorithm
    global p, q, state
    state = [n for n in range(256)]
    p = q = j = 0
    for i in range(256):
        if len(key) > 0:
            j = (j + state[i] + key[i % len(key)]) % 256
        else:
            j = (j + state[i]) % 256
    state[i], state[j] = state[j], state[i]

def byteGenerator():
    ##RC4 Pseudo-Random Generation Algorithm
    global p, q, state
    p = (p + 1) % 256
    q = (q + state[p]) % 256
    state[p], state[q] = state[q], state[p]
    return state[(state[p] + state[q]) % 256]

def encrypt(key,inputString):
    ##Encrypt input string returning a byte list
    setKey(string_to_list(key))
    return [ord(p) ^ byteGenerator() for p in inputString]

def decrypt(inputByteList):
    ##Decrypt input byte list returning a string
    return "".join([chr(c ^ byteGenerator()) for c in inputByteList])



def intToList(inputNumber):
    ##Convert a number into a byte list
    inputString = "{:02x}".format(inputNumber)
    return [(inputString[i:i + 2], 16) for i in range(0,    len(inputString), 2)]

def string_to_list(inputString):
    ##Convert a string into a byte list
    return [ord(c) for c in inputString]


loop = 1
while loop == 1: #simple loop to always bring the user back to the menu

    print("RC4 Encryptor/Decryptor")
    print
    print("Please choose an option from the below menu")
    print
    print("1) Encrypt")
    print("2) Decrypt")
    print

    choice = input("Choose your option: ")
    choice = int(choice)

    if choice == 1:
        key = input("Enter Key: ")
        inputstring = input("enter plaintext: ")
        print(encrypt(key, inputstring))


    elif choice == 2:  
        key = input("Enter Key: ")
        ciphertext = input("enter plaintext: ")
        print(decrypt(intToList(ciphertext)))

    elif choice == 3:
    #returns the user to the previous menu by ending the loop and clearing the screen.
        loop = 0

    else:  
        print ("please enter a valid option") #if any NUMBER other than 1, 2 or 3 is entered.

标签: pythonpython-3.xstringhexstring-formatting

解决方案


看起来您正在尝试将字符串转换为十六进制。不幸的是,这不是这样做的方法:"{:02x}".format用于格式化单个整数,因此它不适用于整个字符串。

Python 3 包含bytes.hex()为您执行此转换的方法,但您需要一个字节字符串而不是普通字符串。您可以使用字符串编码将 str 转换为字节。

如果您想自己进行转换,您可以调用"{:02x}".format字符串中每个字符的字符代码,并将各个十六进制值连接在一起。在这种情况下要小心使用 Unicode;使用字节字符串可能会更好。


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