void rc4_init(PRC4Ext pRC4, unsigned char *pbyKey, unsigned int cbKey_len)
{
- unsigned int ust1, ust2;
- unsigned int keyindex;
- unsigned int stateindex;
- unsigned char *pbyst;
- unsigned int idx;
+ unsigned int ust1, ust2;
+ unsigned int keyindex;
+ unsigned int stateindex;
+ unsigned char *pbyst;
+ unsigned int idx;
- pbyst = pRC4->abystate;
- pRC4->ux = 0;
- pRC4->uy = 0;
- for (idx = 0; idx < 256; idx++)
- pbyst[idx] = (unsigned char)idx;
- keyindex = 0;
- stateindex = 0;
- for (idx = 0; idx < 256; idx++) {
- ust1 = pbyst[idx];
- stateindex = (stateindex + pbyKey[keyindex] + ust1) & 0xff;
- ust2 = pbyst[stateindex];
- pbyst[stateindex] = (unsigned char)ust1;
- pbyst[idx] = (unsigned char)ust2;
- if (++keyindex >= cbKey_len)
- keyindex = 0;
- }
+ pbyst = pRC4->abystate;
+ pRC4->ux = 0;
+ pRC4->uy = 0;
+ for (idx = 0; idx < 256; idx++)
+ pbyst[idx] = (unsigned char)idx;
+ keyindex = 0;
+ stateindex = 0;
+ for (idx = 0; idx < 256; idx++) {
+ ust1 = pbyst[idx];
+ stateindex = (stateindex + pbyKey[keyindex] + ust1) & 0xff;
+ ust2 = pbyst[stateindex];
+ pbyst[stateindex] = (unsigned char)ust1;
+ pbyst[idx] = (unsigned char)ust2;
+ if (++keyindex >= cbKey_len)
+ keyindex = 0;
+ }
}
unsigned int rc4_byte(PRC4Ext pRC4)
{
- unsigned int ux;
- unsigned int uy;
- unsigned int ustx, usty;
- unsigned char *pbyst;
+ unsigned int ux;
+ unsigned int uy;
+ unsigned int ustx, usty;
+ unsigned char *pbyst;
- pbyst = pRC4->abystate;
- ux = (pRC4->ux + 1) & 0xff;
- ustx = pbyst[ux];
- uy = (ustx + pRC4->uy) & 0xff;
- usty = pbyst[uy];
- pRC4->ux = ux;
- pRC4->uy = uy;
- pbyst[uy] = (unsigned char)ustx;
- pbyst[ux] = (unsigned char)usty;
+ pbyst = pRC4->abystate;
+ ux = (pRC4->ux + 1) & 0xff;
+ ustx = pbyst[ux];
+ uy = (ustx + pRC4->uy) & 0xff;
+ usty = pbyst[uy];
+ pRC4->ux = ux;
+ pRC4->uy = uy;
+ pbyst[uy] = (unsigned char)ustx;
+ pbyst[ux] = (unsigned char)usty;
- return pbyst[(ustx + usty) & 0xff];
+ return pbyst[(ustx + usty) & 0xff];
}
void rc4_encrypt(PRC4Ext pRC4, unsigned char *pbyDest,
- unsigned char *pbySrc, unsigned int cbData_len)
+ unsigned char *pbySrc, unsigned int cbData_len)
{
- unsigned int ii;
- for (ii = 0; ii < cbData_len; ii++)
- pbyDest[ii] = (unsigned char)(pbySrc[ii] ^ rc4_byte(pRC4));
+ unsigned int ii;
+ for (ii = 0; ii < cbData_len; ii++)
+ pbyDest[ii] = (unsigned char)(pbySrc[ii] ^ rc4_byte(pRC4));
}