APDU.py 文件源码

def calcKCV(keyValue, zAES=False):
    """Calculate KCV for symmetric key.
keyValue - key values as string (DES, 3DES2k, 3DES3k, AES)
zAES     - True if key is AES (i.e. encrypt block of '01' instead of '00')

Return 3B-long string."""
    if zAES:
        assert len(keyValue) in (16, 24, 32), "Wrong length of AES key"
        block = '\x01'*16
        tkey = AES.new(keyValue, AES.MODE_ECB)
    else:
        assert len(keyValue) in (8, 16, 24), "Wrong length of (3)DES key"
        block = '\x00'*8
        if len(keyValue) == 8:
            tkey = DES.new(keyValue, DES.MODE_ECB)
        else:
            tkey = DES3.new(keyValue, DES.MODE_ECB)
    return tkey.encrypt(block)[:3]