def aes256cbc_dec(key, iv, data):
pt = pkcs7_unpad(dec_cbc(aes(key), iv)(data))
return pt
def aes256cbc_enc(key, iv, data):
assert len(iv) == 128/8, len(iv)
assert len(key) == 256/8, len(key)
ct = enc_cbc(aes(key), iv)(pkcs7_pad(data))
return ct