des.rar_des_visual c

#include<stdio.h> static unsigned char source2[8],k2[16][48];//保留密文、和子密钥 void des(unsigned char *source,unsigned char * inkey, int flg) { unsigned char bufout[64], kwork[56], worka[48], kn[48], buffer[64], key[64],temp1, temp2; int valindex,dest[8];char shift1; int i,j,m; //s1-8 函数 static unsigned char s1[4][16] = { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 }; static unsigned char s2[4][16] = { 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 }; static unsigned char s3[4][16] = { 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 }; static unsigned char s4[4][16] = { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 }; static unsigned char s5[4][16] = { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 }; static unsigned char s6[4][16] = { 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 }; static unsigned char s7[4][16] = { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 }; static unsigned char s8[4][16] = { 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 }; static unsigned char shift[16] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; //移位次数 //密码的二进制位变换 if(flg==1){ for (i = 0; i < 8; i++) { j = *(inkey + i); key[8*i] = (j/128) % 2; //依次取每个字符,变为二进制位 key[8*i+1] = (j / 64) % 2; key[8*i+2] = (j / 32) % 2; key[8*i+3] = (j / 16) % 2; key[8*i+4] = (j / 8) % 2; key[8*i+5] = (j / 4) % 2; key[8*i+6] = (j / 2) % 2; key[8*i+7] = j % 2; } } //原文的二进制变换 for (i = 0; i < 8; i++) { j = *(source + i); //依次取每个字符,变为二进制位 buffer[8*i] = ((j) / 128) % 2; buffer[8*i+1] = (j / 64) % 2; buffer[8*i+2] = (j / 32) % 2; buffer[8*i+3] = (j / 16) % 2; buffer[8*i+4] = (j / 8) % 2; buffer[8*i+5] = (j / 4) % 2; buffer[8*i+6] = (j / 2) % 2; buffer[8*i+7] = j % 2; } //原文初始置换 bufout[ 0] = buffer[57]; bufout[ 1] = buffer[49]; bufout[ 2] = buffer[41]; bufout[ 3] = buffer[33]; bufout[ 4] = buffer[25]; bufout[ 5] = buffer[17]; bufout[ 6] = buffer[ 9]; bufout[ 7] = buffer[ 1]; bufout[ 8] = buffer[59]; bufout[ 9] = buffer[51]; bufout[10] = buffer[43]; bufout[11] = buffer[35]; bufout[12] = buffer[27]; bufout[13] = buffer[19]; bufout[14] = buffer[11]; bufout[15] = buffer[ 3]; bufout[16] = buffer[61]; bufout[17] = buffer[53]; bufout[18] = buffer[45]; bufout[19] = buffer[37]; bufout[20] = buffer[29]; bufout[21] = buffer[21]; bufout[22] = buffer[13]; bufout[23] = buffer[ 5]; bufout[24] = buffer[63]; bufout[25] = buffer[55]; bufout[26] = buffer[47]; bufout[27] = buffer[39]; bufout[28] = buffer[31]; bufout[29] = buffer[23]; bufout[30] = buffer[15]; bufout[31] = buffer[ 7]; bufout[32] = buffer[56]; bufout[33] = buffer[48]; bufout[34] = buffer[40]; bufout[35] = buffer[32]; bufout[36] = buffer[24]; bufout[37] = buffer[16]; bufout[38] = buffer[ 8]; bufout[39] = buffer[ 0]; bufout[40] = buffer[58]; bufout[41] = buffer[50]; bufout[42] = buffer[42]; bufout[43] = buffer[34]; bufout[44] = buffer[26]; bufout[45] = buffer[18]; bufout[46] = buffer[10]; bufout[47] = buffer[ 2]; bufout[48] = buffer[60]; bufout[49] = buffer[52]; bufout[50] = buffer[44]; bufout[51] = buffer[36]; bufout[52] = buffer[28]; bufout[53] = buffer[20]; bufout[54] = buffer[12]; bufout[55] = buffer[ 4]; bufout[56] = buffer[62]; bufout[57] = buffer[54]; bufout[58] = buffer[46]; bufout[59] = buffer[38]; bufout[60] = buffer[30]; bufout[61] = buffer[22]; bufout[62] = buffer[14]; bufout[63] = buffer[ 6]; if(flg==1){//密码缩小置换64---56 kwork[ 0] = key[56]; kwork[ 1] = key[48]; kwork[ 2] = key[40]; kwork[ 3] = key[32]; kwork[ 4] = key[24]; kwork[ 5] = key[16]; kwork[ 6] = key[ 8]; kwork[ 7] = key[ 0]; kwork[ 8] = key[57]; kwork[ 9] = key[49]; kwork[10] = key[41]; kwork[11] = key[33]; kwork[12] = key[25]; kwork[13] = key[17]; kwork[14] = key[ 9]; kwork[15] = key[ 1]; kwork[16] = key[58]; kwork[17] = key[50]; kwork[18] = key[42]; kwork[19] = key[34]; kwork[20] = key[26]; kwork[21] = key[18]; kwork[22] = key[10]; kwork[23] = key[ 2]; kwork[24] = key[59]; kwork[25] = key[51]; kwork[26] = key[43]; kwork[27] = key[35]; kwork[28] = key[62]; kwork[29] = key[54]; kwork[30] = key[46]; kwork[31] = key[38]; kwork[32] = key[30]; kwork[33] = key[22]; kwork[34] = key[14]; kwork[35] = key[ 6]; kwork[36] = key[61]; kwork[37] = key[53]; kwork[38] = key[45]; kwork[39] = key[37]; kwork[40] = key[29]; kwork[41] = key[21]; kwork[42] = key[13]; kwork[43] = key[ 5]; kwork[44] = key[60]; kwork[45] = key[52]; kwork[46] = key[44]; kwork[47] = key[36]; kwork[48] = key[28]; kwork[49] = key[20]; kwork[50] = key[12]; kwork[51] = key[ 4]; kwork[52] = key[27]; kwork[53] = key[19]; kwork[54] = key[11]; kwork[55] = key[ 3]; } //16轮循环迭代 for (m = 1; m <=16; m++) { for (i = 0; i < 32; i++) buffer[i] = bufout[32+i]; //右半部分32位 //放大变换 worka[ 0] = buffer[31]; worka[ 1] = buffer[ 0]; worka[ 2] = buffer[ 1]; worka[ 3] = buffer[ 2]; worka[ 4] = buffer[ 3]; worka[ 5] = buffer[ 4]; worka[ 6] = buffer[ 3]; worka[ 7] = buffer[ 4]; worka[ 8] = buffer[ 5]; worka[ 9] = buffer[ 6]; worka[10] = buffer[ 7]; worka[11] = buffer[ 8]; worka[12] = buffer[ 7]; worka[13] = buffer[ 8]; worka[14] = buffer[ 9]; worka[15] = buffer[10]; worka[16] = buffer[11]; worka[17] = buffer[12]; worka[18] = buffer[11]; worka[19] = buffer[12]; worka[20] = buffer[13]; worka[21] = buffer[14]; worka[22] = buffer[15]; worka[23] = buffer[16]; worka[24] = buffer[15]; worka[25] = buffer[16]; worka[26] = buffer[17]; worka[27] = buffer[18]; worka[28] = buffer[19]; worka[29] = buffer[20]; worka[30] = buffer[19]; worka[31] = buffer[20]; worka[32] = buffer[21]; worka[33] = buffer[22]; worka[34] = buffer[23]; worka[35] = buffer[24]; worka[36] = buffer[23]; worka[37] = buffer[24]; worka[38] = buffer[25]; worka[39] = buffer[26]; worka[40] = buffer[27]; worka[41] = buffer[28]; worka[42] = buffer[27]; worka[43] = buffer[28]; worka[44] = buffer[29]; worka[45] = buffer[30]; worka[46] = buffer[31]; worka[47] = buffer[ 0]; if (flg) { //加密移位 shift1 = shift[m-1]; //查找每次循环对应的key 循环左移位数 for (i = 0; i< shift1; i++) { //C0 ....循环左移 temp1 = kwork[0]; temp2 = kwork[28]; for (j = 0; j < 27; j++) { kwork[j] = kwork[j+1]; kwork[j+28] = kwork[j+29]; } kwork[27] = temp1; kwork[55] = temp2; } } if(flg){ //子密钥压缩置换56---48 kn[ 0]