#这个有问题
from Crypto.Cipher import AES
from base64 import b64encode, b64decode
 
 
def encrypt_ecb(data, key):
    data = data.encode()
    key = key.encode()
    aes = AES.new(key, AES.MODE_CBC, bytes(16))  
    res = aes.encrypt(pad(data, 32))
    return b64encode(res).decode()
 
 
def decrypt(data, key, iv):
    key = key.encode()
    iv = iv.encode()
    # aes = AES.new(key, AES.MODE_CBC, bytes(16))
    aes = AES.new(key, AES.MODE_CBC, iv)
    res = aes.decrypt(b64decode(data))
    return unpad(res, 32).decode()
 

def unpad(padded_data, block_size, style='pkcs7'):
    pdata_len = len(padded_data)
    if pdata_len == 0:
        raise ValueError("Zero-length input cannot be unpadded")
    if pdata_len % block_size:
        raise ValueError("Input data is not padded")
    if style in ('pkcs7', 'x923'):
        padding_len = bord(padded_data[-1])
        if padding_len<1 or padding_len>min(block_size, pdata_len):
            raise ValueError("Padding is incorrect.")
        if style == 'pkcs7':
            if padded_data[-padding_len:]!=bchr(padding_len)*padding_len:
                raise ValueError("PKCS#7 padding is incorrect.")
        else:
            if padded_data[-padding_len:-1]!=bchr(0)*(padding_len-1):
                raise ValueError("ANSI X.923 padding is incorrect.")
    elif style == 'iso7816':
        padding_len = pdata_len - padded_data.rfind(bchr(128))
        if padding_len<1 or padding_len>min(block_size, pdata_len):
            raise ValueError("Padding is incorrect.")
        if padding_len>1 and padded_data[1-padding_len:]!=bchr(0)*(padding_len-1):
            raise ValueError("ISO 7816-4 padding is incorrect.")
    else:
        raise ValueError("Unknown padding style")
    return padded_data[:-padding_len]

def pad(data_to_pad, block_size, style='pkcs7'):
    padding_len = block_size-len(data_to_pad)%block_size
    if style == 'pkcs7':
        padding = bchr(padding_len)*padding_len
    elif style == 'x923':
        padding = bchr(0)*(padding_len-1) + bchr(padding_len)
    elif style == 'iso7816':
        padding = bchr(128) + bchr(0)*(padding_len-1)
    else:
        raise ValueError("Unknown padding style")
    return data_to_pad + padding

def bord(s):
    return s
def bchr(s):
    return bytes([s])

if __name__ == '__main__':

    decrypt_data = decrypt('QkjNiuixpmtcxxqxaIZ30A==', 'm0XsOHC52YZ5KtakhpuMSZtF7DhwudmG', 'OCRocr2024UATocr')
    print('解密：', decrypt_data)