62 17 61 49
54 18 53 50
46 19 45 51
38 20 37 52
30 21 29 53
22 22 21 54
14 23 13 55
6 24 5 56
64 25 63 57
56 26 55 58
48 27 47 59
40 28 39 60
32 29 31 61
24 30 23 62
16 31 15 63
8 32 7 64
[6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]
[6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]
2.3 将变换后的数据块等分成前后两部分,前32位记为L[0],后32位记为R[0]。
2.4 用16个子密钥对数据加密。
2.4.1 根据下面的扩冲函数E,扩展32位的成48位
bit goes to bit bit goes to bit bit goes to bit bit goes to bit
32 1 8 13 16 25 24 37
1 2 9 14 17 26 25 38
2 3 10 15 18 27 26 39
3 4 11 16 19 28 27 40
4 5 12 17 &
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