python：实现DES和3DES加解密算法
import sys_pythonMajorVersion = sys.version_info[0]# Modes of crypting / cypheringECB = 0CBC = 1# Modes of paddingPAD_NORMAL = 1PAD_PKCS5 = 2# PAD_PKCS5: is a method that will unambiguously remove all padding
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