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运算结果为：
- $ python3 padding_oracle_exp.py
- nblocks: 3
- block[0] = b'00000000000000000000000000000000'
- block[1] = b'c8ab1c881b40d54d81d1efab429ad239'
- block[2] = b'dac1d6573e7c26d533ffc3cbc23a8455'
- iv: b'x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00'
- decrypting block[-1], prev = b'c8ab1c881b40d54d81d1efab429ad239'
- mutating block[-2][15]
- begin: 11111111111111111111111111111139
- found c=59, i=1^59=58, o=57, p=3
- mutating block[-2][14]
- begin: 1111111111111111111111111111d238
- found c=211, i=2^211=209, o=210, p=3
- mutating block[-2][13]
- begin: 111111111111111111111111119ad239
- found c=154, i=3^154=153, o=154, p=3
- mutating block[-2][12]
- begin: 111111111111111111111111429dd53e
- found c=43, i=4^43=47, o=66, p=109
- mutating block[-2][11]
- begin: 1111111111111111111111ab2a9cd43f
- found c=222, i=5^222=219, o=171, p=112
- mutating block[-2][10]
- begin: 11111111111111111111efdd299fd73c
- found c=182, i=6^182=176, o=239, p=95
- mutating block[-2][9]
- begin: 111111111111111111d1b7dc289ed63d
- found c=226, i=7^226=229, o=209, p=52
- mutating block[-2][8]
- begin: 111111111111111181edb8d32791d932
- found c=214, i=8^214=222, o=129, p=95
- mutating block[-2][7]
- begin: 111111111111114dd7ecb9d22690d833
- found c=48, i=9^48=57, o=77, p=116
- mutating block[-2][6]
- begin: 111111111111d533d4efbad12593db30
- found c=190, i=10^190=180, o=213, p=97
- mutating block[-2][5]
- begin: 111111111140bf32d5eebbd02492da31
- found c=20, i=11^20=31, o=64, p=95
- mutating block[-2][4]
- begin: 111111111b13b835d2e9bcd72395dd36
- found c=114, i=12^114=126, o=27, p=101
- mutating block[-2][3]
- begin: 111111887312b934d3e8bdd62294dc37
- found c=247, i=13^247=250, o=136, p=114
- mutating block[-2][2]
- begin: 11111cf47011ba37d0ebbed52197df34
- found c=115, i=14^115=125, o=28, p=97
- mutating block[-2][1]
- begin: 11ab72f57110bb36d1eabfd42096de35
- found c=209, i=15^209=222, o=171, p=117
- mutating block[-2][0]
- begin: c8ce6dea6e0fa429cef5a0cb3f89c12a
- found c=169, i=16^169=185, o=200, p=113
- plaintext = bytearray(b'quare_at_4_pmx03x03x03')
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