用C语言实现DES算法

文章摘要：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];

用C语言实现DES算法,标签：fpga是什么,fpga教程,http://www.88dzw.com
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 Iterations */
for (iter = 1; iter < 17; iter++) {
for (i = 0; i < 32; i++)
{
    buffer[i] = bufout[32+i];
}
/* Calculation of F(R, K) */
/* Permute - E */
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];
/* KS Function Begin */
if (flg) {
nbrofshift = shift[iter-1];
for (i = 0; i < (int) nbrofshift; i++) {
    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;
}
} else if (iter > 1) {
nbrofshift = shift[17-iter];
for (i = 0; i < (int) nbrofshift; i++) {

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