Sandboxie/SandboxiePlus/MiscHelpers/Common/qRC4.cpp

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2021-10-16 16:19:51 +01:00
#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;
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}