DES算法实现过程分析
bsp;根据下面的扩冲函数E,扩展32位的成48位
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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 20 29 28 41
5 6 13 18 21 3