63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
#include "stdafx.h"
|
|
#include "qRC4.h"
|
|
#include <QByteArray>
|
|
|
|
void
|
|
rc4_swap(unsigned char &a, unsigned char &b)
|
|
{
|
|
unsigned char c = a;
|
|
a = b;
|
|
b = c;
|
|
}
|
|
|
|
void
|
|
rc4_init(rc4_sbox_t *rc4_sbox, const unsigned char *key_ptr, unsigned int key_len)
|
|
{
|
|
rc4_sbox->x = 0;
|
|
rc4_sbox->y = 0;
|
|
|
|
// Initialisation of the permutation
|
|
unsigned int i;
|
|
for (i = 0; i < 256; i++)
|
|
rc4_sbox->state[i] = (char)i;
|
|
|
|
// Mixing permutation
|
|
unsigned int j = 0;
|
|
unsigned int k;
|
|
for (i = 0; i < 256; i++)
|
|
{
|
|
k = i % key_len;
|
|
|
|
j = (key_ptr[k] + rc4_sbox->state[i] + j) & 0xff;
|
|
rc4_swap(rc4_sbox->state[i], rc4_sbox->state[j]);
|
|
}
|
|
}
|
|
|
|
void
|
|
rc4_transform(rc4_sbox_t *rc4_sbox, unsigned char *buffer_ptr, unsigned int buffer_len)
|
|
{
|
|
unsigned int i;
|
|
for (i = 0; i < buffer_len; i++)
|
|
{
|
|
// The pseudo-random generation algorithm
|
|
rc4_sbox->x = (rc4_sbox->x + 1) & 0xff;
|
|
rc4_sbox->y = (rc4_sbox->y + rc4_sbox->state[rc4_sbox->x]) & 0xff;
|
|
rc4_swap(rc4_sbox->state[rc4_sbox->x], rc4_sbox->state[rc4_sbox->y]);
|
|
unsigned char keyChar = rc4_sbox->state[(rc4_sbox->state[rc4_sbox->x] + rc4_sbox->state[rc4_sbox->y]) & 0xff];
|
|
|
|
if (buffer_ptr) // NULL when seeking
|
|
buffer_ptr[i] ^= keyChar;
|
|
}
|
|
}
|
|
|
|
void MISCHELPERS_EXPORT rc4_init(rc4_sbox_t *rc4_sbox, const QByteArray& Key)
|
|
{
|
|
rc4_init(rc4_sbox, (unsigned char*)Key.data(), Key.size());
|
|
}
|
|
|
|
QByteArray MISCHELPERS_EXPORT rc4_transform(rc4_sbox_t *rc4_sbox, const QByteArray& Data)
|
|
{
|
|
QByteArray Temp = Data;
|
|
rc4_transform(rc4_sbox, (unsigned char*)Temp.data(), Temp.size());
|
|
return Temp;
|
|
} |