用C语言实现DES算法

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worka[39])+worka[40]];
valindex = valindex * 4;
kn[24] = binary[0+valindex];
kn[25] = binary[1+valindex];
kn[26] = binary[2+valindex];
kn[27] = binary[3+valindex];
valindex = s8[2*worka[42]+worka[47]]
[2*(2*(2*worka[43]+worka[44])+
worka[45])+worka[46]];
valindex = valindex * 4;
kn[28] = binary[0+valindex];
kn[29] = binary[1+valindex];
kn[30] = binary[2+valindex];
kn[31] = binary[3+valindex];
/* Permute - P */
worka[ 0] = kn[15];
worka[ 1] = kn[ 6];
worka[ 2] = kn[19];
worka[ 3] = kn[20];
worka[ 4] = kn[28];
worka[ 5] = kn[11];
worka[ 6] = kn[27];
worka[ 7] = kn[16];
worka[ 8] = kn[ 0];
worka[ 9] = kn[14];
worka[10] = kn[22];
worka[11] = kn[25];
worka[12] = kn[ 4];
worka[13] = kn[17];
worka[14] = kn[30];
worka[15] = kn[ 9];
worka[16] = kn[ 1];
worka[17] = kn[ 7];
worka[18] = kn[23];
worka[19] = kn[13];
worka[20] = kn[31];
worka[21] = kn[26];
worka[22] = kn[ 2];
worka[23] = kn[ 8];
worka[24] = kn[18];
worka[25] = kn[12];
worka[26] = kn[29];
worka[27] = kn[ 5];
worka[28] = kn[21];
worka[29] = kn[10];
worka[30] = kn[ 3];
worka[31] = kn[24];
/* bufout XOR worka */
for (i = 0; i < 32; i++) {
    bufout[i+32] = bufout[i] ^ worka[i];
    bufout[i] = buffer[i];
}
} /* End of Iter */
/* Prepare Output */
for (i = 0; i < 32; i++) {
    j = bufout[i];
    bufout[i] = bufout[32+i];
    bufout[32+i] = j;
}
/* Inverse Initial Permutation */
buffer[ 0] = bufout[39];
buffer[ 1] = bufout[ 7];
buffer[ 2] = bufout[47];
buffer[ 3] = bufout[15];
buffer[ 4] = bufout[55];
buffer[ 5] = bufout[23];
buffer[ 6] = bufout[63];
buffer[ 7] = bufout[31];
buffer[ 8] = bufout[38];
buffer[ 9] = bufout[ 6];
buffer[10] = bufout[46];
buffer[11] = bufout[14];
buffer[12] = bufout[54];
buffer[13] = bufout[22];
buffer[14] = bufout[62];
buffer[15] = bufout[30];
buffer[16] = bufout[37];
buffer[17] = bufout[ 5];
buffer[18] = bufout[45];
buffer[19] = bufout[13];
buffer[20] = bufout[53];
buffer[21] = bufout[21];
buffer[22] = bufout[61];
buffer[23] = bufout[29];
buffer[24] = bufout[36];
buffer[25] = bufout[ 4];
buffer[26] = bufout[44];
buffer[27] = bufout[12];
buffer[28] = bufout[52];
buffer[29] = bufout[20];
buffer[30] = bufout[60];
buffer[31] = bufout[28];
buffer[32] = bufout[35];
buffer[33] = bufout[ 3];
buffer[34] = bufout[43];
buffer[35] = bufout[11];
buffer[36] = bufout[51];
buffer[37] = bufout[19];
buffer[38] = bufout[59];
buffer[39] = bufout[27];
buffer[40] = bufout[34];
buffer[41] = bufout[ 2];
buffer[42] = bufout[42];
buffer[43] = bufout[10];
buffer[44] = bufout[50];
buffer[45] = bufout[18];
buffer[46] = bufout[58];
buffer[47] = bufout[26];
buffer[48] = bufout[33];
buffer[49] = bufout[ 1];
buffer[50] = bufout[41];
buffer[51] = bufout[ 9];
buffer[52] = bufout[49];
buffer[53] = bufout[17];
buffer[54] = bufout[57];
buffer[55] = bufout[25];
buffer[56] = bufout[32];
buffer[57] = bufout[ 0];
buffer[58] = bufout[40];
buffer[59] = bufout[ 8];
buffer[60] = bufout[48];
buffer[61] = bufout[16];
buffer[62] = bufout[56];
buffer[63] = bufout[24];
j = 0;
for (i = 0; i < 8; i++) {
    *(dest + i) = 0x00;
    for (k = 0; k < 7; k++)
    *(dest + i) = ((*(dest + i)) + buffer[j+k]) * 2;
    *(dest + i) = *(dest + i) + buffer[j+7];
    j += 8;
}
return 0;
}

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