vc++基于Misty1算法的加密软件设计+源码 第4页
FL-1输入为：
Y32 = YL‖YR
KLi = KLiL‖KLIr
FL-1的功能：
XL = (YR| KLIr) ∧YL
XR = (XL& KLiL) ∧YR
则输出：
X32 = XL‖XR
3.FO函数
FO函数由32位的输入数据X32和两组子密钥和48位的KIi构成。输入数据X32分为两个16位的L0和R0，64位的KOi 分为4组16位的子密钥，48位本文来自辣文论文网原文请找QQ752018766的KIi 分为3组16位的子密钥，FO函数最后返回一个32位的数据Y32，具体操作由图4所示：
图4 FO函数
FO的输入为：
X32=L0‖R0
KOi= KOi1‖KOi2‖KOi3‖KOi4
KIi= KIi1‖KIi2‖KIi3
FO的功能能表现为：
For i=1 to 3 do:
Rj=FI (Lj-1^KOij,KIij) ^Rj-1
Lj=Rj-1
Y32= (L3^KOi4)R3
4.FI函数
FI函数由16位输入数据和16位的子密钥KIij构成。输入数据X16分为两个不等长的部分即9位的L0和7位的R0，密钥KIij也被分为7位的KIijl和9位的KIijr两部分。FI返回一个16位的数据Y16。在函数中使用了两个S-盒，S7将7比特的输入映射为7比特的输出，S9将9比特的输入映射为9比特的输出。Zero-extend表示在7位的数据x尾部（最右边）添加2个零，将7位转换为9位。Truncate表示9位的数据x的头部（最左边）删除两个位数据，将9位转换为7位。具体操作如图5所示：
图5 FI函数
FI的输入为：
X16= L0‖R0
KIij=KIijL‖KIijR
FI则定义为：
毕业论文
http://www.751com.cnL1=R0
R2=S7[L1] ^(truncate(R1))KIijL
R3=S9[L2] ^(00b‖R2)
L3=R2
Y16=L3‖R3
5.S-boxes
两个S-boxes 既可以由组合逻辑实现，也可以通过查找表来实现。在本设计中由于考虑到加密的速度，所以才用了查表的方法来实现。
S7和S9表如下：
S7[] = {
54, 50, 62, 56, 22, 34, 94, 96, 38, 6, 63, 93, 2, 18,123, 33,
55,113, 39,114, 21, 67, 65, 12, 47, 73, 46, 27, 25,111,124, 81,
53, 9,121, 79, 52, 60, 58, 48,101,127, 40,120,104, 70, 71, 43,
20,122, 72, 61, 23,109, 13,100, 77, 1, 16, 7, 82, 10,105, 98,
117,116, 76, 11, 89,106, 0,125,118, 99, 86, 69, 30, 57,126, 87,
112, 51, 17, 5, 95, 14, 90, 84, 91, 8, 35,103, 32, 97, 28, 66,
102, 31, 26, 45, 75, 4, 85, 92, 37, 74, 80, 49, 68, 29,115, 44,
64,107,108, 24,110, 83, 36, 78, 42, 19, 15, 41, 88,119, 59, 3};
S9[] = {
167,239,161,379,391,334, 9,338, 38,226, 48,358,452,385, 90,397,
183,253,147,331,415,340,51,362,306,500,262, 82,216,159,356,177,
175,241,489, 37,206, 17, 0,333, 44,254,378, 58,143,220, 81,400,
95,3,315,245, 54,235,218,405,472,264,172,494,371,290,399, 76,
165,197,395,121,257,480,423,212,240,28,462,176,406,507,288,223,501,407,249,265, 89,186,221,428,164, 74,440,196,458,421,350,163,
232,158,134,354, 13,250,491,142,191, 69,193,425,152,227,366,135,
344,300,276,242,437,320,113,278, 11,243, 87,317, 36, 93,496, 27,
487,446,482, 41, 68,156,457,131,326,403,339, 20, 39,115,442,124,
475,384,508,53,112,170,479,151,126,169, 73,268,279,321,168,364,
363,292,46,499,393,327,324, 24,456,267,157,460,488,426,309,229,
439,506,208,271,349,401,434,236, 16,209,359, 52, 56,120,199,277,
465,416,252,287,246, 6, 83,305,420,345,153,502, 65, 61,244,282,
173,222,418, 67,386,368,261,101,476,291,195,430, 49, 79,166,330,
280,383,373,128,382,408,155,495,367,388,274,107,459,417,62,454,132,225,203,316,234, 14,301, 91,503,286,424,211,347,307,140,374,
35,103,125,427, 19,214,453,146,498,314,444,230,256,329,198,285,
50,116, 78,410, 10,205,510,171,231, 45,139,467, 29, 86,505, 32,
72,26,342,150,313,490,431,238,411,325,149,473, 40,119,174,355,
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