用C语言实现DES算法

文章摘要： temp1 = kwork[27]; temp2 = kwork[55]; for (j = 27; j > 0; j--) { kwork[j] = kwork[j-1]; kwork[j+28] = kwork[j+27]; } kwork[0] = temp1; kwork[28] = temp2;}}/* Permute kwork - PC2 */kn[ 0] = kwork[13];kn[ 1] = kwork[16];kn[ 2] = kwork[10];kn[ 3] = kwor

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    temp1 = kwork[27];
    temp2 = kwork[55];
    for (j = 27; j > 0; j--) {
     kwork[j] = kwork[j-1];
     kwork[j+28] = kwork[j+27];
    }
    kwork[0] = temp1;
    kwork[28] = temp2;
}
}
/* Permute kwork - PC2 */
kn[ 0] = kwork[13];
kn[ 1] = kwork[16];
kn[ 2] = kwork[10];
kn[ 3] = kwork[23];
kn[ 4] = kwork[ 0];
kn[ 5] = kwork[ 4];
kn[ 6] = kwork[ 2];
kn[ 7] = kwork[27];
kn[ 8] = kwork[14];
kn[ 9] = kwork[ 5];
kn[10] = kwork[20];
kn[11] = kwork[ 9];
kn[12] = kwork[22];
kn[13] = kwork[18];
kn[14] = kwork[11];
kn[15] = kwork[ 3];
kn[16] = kwork[25];
kn[17] = kwork[ 7];
kn[18] = kwork[15];
kn[19] = kwork[ 6];
kn[20] = kwork[26];
kn[21] = kwork[19];
kn[22] = kwork[12];
kn[23] = kwork[ 1];
kn[24] = kwork[40];
kn[25] = kwork[51];
kn[26] = kwork[30];
kn[27] = kwork[36];
kn[28] = kwork[46];
kn[29] = kwork[54];
kn[30] = kwork[29];
kn[31] = kwork[39];
kn[32] = kwork[50];
kn[33] = kwork[44];
kn[34] = kwork[32];
kn[35] = kwork[47];
kn[36] = kwork[43];
kn[37] = kwork[48];
kn[38] = kwork[38];
kn[39] = kwork[55];
kn[40] = kwork[33];
kn[41] = kwork[52];
kn[42] = kwork[45];
kn[43] = kwork[41];
kn[44] = kwork[49];
kn[45] = kwork[35];
kn[46] = kwork[28];
kn[47] = kwork[31];
/* KS Function End */
/* worka XOR kn */
for (i = 0; i < 48; i++)
worka[i] = worka[i] ^ kn[i];
/* 8 s-functions */
valindex = s1[2*worka[ 0]+worka[ 5]]
[2*(2*(2*worka[ 1]+worka[ 2])+
worka[ 3])+worka[ 4]];
valindex = valindex * 4;
kn[ 0] = binary[0+valindex];
kn[ 1] = binary[1+valindex];
kn[ 2] = binary[2+valindex];
kn[ 3] = binary[3+valindex];
valindex = s2[2*worka[ 6]+worka[11]]
[2*(2*(2*worka[ 7]+worka[ 8])+
worka[ 9])+worka[10]];
valindex = valindex * 4;
kn[ 4] = binary[0+valindex];
kn[ 5] = binary[1+valindex];
kn[ 6] = binary[2+valindex];
kn[ 7] = binary[3+valindex];
valindex = s3[2*worka[12]+worka[17]]
[2*(2*(2*worka[13]+worka[14])+
worka[15])+worka[16]];
valindex = valindex * 4;
kn[ 8] = binary[0+valindex];
kn[ 9] = binary[1+valindex];
kn[10] = binary[2+valindex];
kn[11] = binary[3+valindex];
valindex = s4[2*worka[18]+worka[23]]
[2*(2*(2*worka[19]+worka[20])+
worka[21])+worka[22]];
valindex = valindex * 4;
kn[12] = binary[0+valindex];
kn[13] = binary[1+valindex];
kn[14] = binary[2+valindex];
kn[15] = binary[3+valindex];
valindex = s5[2*worka[24]+worka[29]]
[2*(2*(2*worka[25]+worka[26])+
worka[27])+worka[28]];
valindex = valindex * 4;
kn[16] = binary[0+valindex];
kn[17] = binary[1+valindex];
kn[18] = binary[2+valindex];
kn[19] = binary[3+valindex];
valindex = s6[2*worka[30]+worka[35]]
[2*(2*(2*worka[31]+worka[32])+
worka[33])+worka[34]];
valindex = valindex * 4;
kn[20] = binary[0+valindex];
kn[21] = binary[1+valindex];
kn[22] = binary[2+valindex];
kn[23] = binary[3+valindex];
valindex = s7[2*worka[36]+worka[41]]
[2*(2*(2*worka[37]+worka[38])+
worka[39])+worka[40]];
valindex = valindex * 4;
kn[24] = binary[0+valindex];
kn[25] = binary[1+valindex];
kn[26] = binary[2+valindex];

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