will yield K[i], which is 48 bits long.
;如下表,改变C[i]和D[i]的排列,得到48位长的k[i]。
# 不懂 :(
# 是不是丢掉了某些位?
Permuted Choice 2 (PC-2)
14 17 11 24 1 5
3 28 15 6 21 10
23 19 12 4 26 8
16 7 27 20 13 2
41 52 31 37 47 55
30 40 51 45 33 48
44 49 39 56 34 53
46 42 50 36 29 32
1.2.3.3 Loop back to 1.2.3.1 until K[16] has been calculated.
;重复 1.2.3.1 开始的过程,算出16个字密钥。
2 Process a 64-bit data block.
;处理一个64位的数据块。
2.1 Get a 64-bit data block. If the block is shorter than 64 bits, it
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