SM4国密算法整理–流程图

前一篇文章没有加入流程图，自己看着也有点晕，现在再次整理下

python代码看我之前的文章: 请点击.

加密

计算轮秘钥

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i从0到3
i从0循环到31
开始
将128bit的秘钥分成4个32bit的数,MK0,MK1,MK2,MK3
MKi异或FKi, FKi为常数
Ki
得到K0 K1 K2 K3
Bi = Ki+1 异或 Ki+2 异或 Ki+3 异或 CKi, CKi为常数, 注意,i+1和i+2和i+3为K的角标
将Bi做S盒计算得到Ci,即查表计算
Ci 异或 Ci循环左移13 异或 Ci循环左移23 = Di
rki = Ki+4 = Ki 异或 Di,注意 i+4为K的角标
得到rk0...rk31

轮函数

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i从0循环到31
开始
取待加密的数据4个32位的数据,X0,X1,X2,X3
Xi+1异或Xi+2异或Xi+3异或rki = Ai, 注意i+1,x+2,x+3为X的角标
Ai进行S盒计算得到Bi,即查表
Ci = Bi 异或 Bi循环左移2 异或 Bi循环左移10 异或 Bi循环左移18 异或 Bi循环左移24
Xi 异或 Ci = Xi+4, 注意i+4为X的角标
得到X4...X35
X35 X34 X33 X32 就是加密后的内容, 注意顺序不能变

解密

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i从0循环到31
开始
取待解密的数据4个32位的数据,X0,X1,X2,X3
Xi+1异或Xi+2异或Xi+3异或rk31-i = Ai, 注意i+1,x+2,x+3为X的角标, 31-i为rk的角标
Ai进行S盒计算得到Bi,即查表
Ci = Bi 异或 Bi循环左移2 异或 Bi循环左移10 异或 Bi循环左移18 异或 Bi循环左移24
Xi 异或 Ci = Xi+4, 注意i+4为X的角标
得到X4...X35
X35 X34 X33 X32 就是解密后的内容, 注意顺序不能变
这里与加密不同 
    CK = [0x00070E15,0x1c232a31,0x383f464d,0x545b6269,0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9,0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249,0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9,0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229,0x30373e45,0x4c535a61,0x686f767d,0x848b9299,0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209,0x10171e25,0x2c333a41,0x484f565d,0x646b7279]# 常数 FK = [0xa3b1bac6,0x56aa3350,0x677d9197,0xb27022dc]# S盒的列表SboxTable = [0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48]

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