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#include "common.h"
#include "arc4.h"
void swap(char *b1, char *b2) {
char b = *b1;
*b1 = *b2;
*b2 = b;
}
void arc4_init(mir_arc4_ctx *ctx, char *key, int keylen) {
int i;
for(i = 0; i < 256; i++)
ctx->lookup[i] = i;
ctx->x = 0;
for(i = 0; i < 256; i++) {
ctx->x = (key[i % keylen] + ctx->lookup[i] + ctx->x) & 0xFF;
swap(&ctx->lookup[ctx->x], &ctx->lookup[i]);
}
ctx->x = 0;
ctx->y = 0;
}
void arc4_crypt(mir_arc4_ctx *ctx, char *dataIn, char *dataOut, int datalen) {
for(int i = 0; i < datalen; i++) {
ctx->x = (ctx->x + 1) & 0xFF;
ctx->y = (ctx->lookup[ctx->x] + ctx->y) & 0xFF;
swap(&ctx->lookup[ctx->x], &ctx->lookup[ctx->y]);
dataOut[i] = (dataIn[i] ^ ctx->lookup[(ctx->lookup[ctx->x] + ctx->lookup[ctx->y]) & 0xFF]);
}
}
int GetARC4Interface(WPARAM wParam, LPARAM lParam) {
struct ARC4_INTERFACE *arc4i = (struct ARC4_INTERFACE*) lParam;
if ( arc4i == NULL )
return 1;
if ( arc4i->cbSize != sizeof( struct ARC4_INTERFACE ))
return 1;
arc4i->arc4_init = arc4_init;
arc4i->arc4_crypt = arc4_crypt;
return 0;
}
HANDLE hService;
void InitARC4Module() {
hService = CreateServiceFunction(MS_SYSTEM_GET_ARC4I, GetARC4Interface);
}
void DeinitARC4Module() {
DestroyServiceFunction(hService);
}
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