/* GCNcrypt - Gamecube AR Crypto Program
 *
 * Copyright notice for this file:
 *  Copyright (C) 2003-2004 Parasyte
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include "encrypt.h"


void scramble1(u32 *addr, u32 *val) {
	u32 tmp;

	*addr = rotate_left(*addr,4);

	tmp = ((*addr^*val)&0xF0F0F0F0);
	*val ^= tmp;
	*addr = rotate_right((*addr^tmp),0x14);

	tmp = ((*addr^*val)&0xFFFF0000);
	*val ^= tmp;
	*addr = rotate_right((*addr^tmp),0x12);

	tmp = ((*addr^*val)&0x33333333);
	*val ^= tmp;
	*addr = rotate_right((*addr^tmp),6);

	tmp = ((*addr^*val)&0x00FF00FF);
	*val ^= tmp;
	*addr = rotate_left((*addr^tmp),9);

	tmp = ((*addr^*val)&0xAAAAAAAA);
	*val = rotate_left((*val^tmp),1);
	*addr ^= tmp;
}

void scramble2(u32 *addr, u32 *val) {
	u32 tmp;

	*addr = rotate_right(*addr,1);

	tmp = ((*addr^*val)&0xAAAAAAAA);
	*addr ^= tmp;
	*val = rotate_right((*val^tmp),9);

	tmp = ((*addr^*val)&0x00FF00FF);
	*addr ^= tmp;
	*val = rotate_left((*val^tmp),6);

	tmp = ((*addr^*val)&0x33333333);
	*addr ^= tmp;
	*val = rotate_left((*val^tmp),0x12);

	tmp = ((*addr^*val)&0xFFFF0000);
	*addr ^= tmp;
	*val = rotate_left((*val^tmp),0x14);

	tmp = ((*addr^*val)&0xF0F0F0F0);
	*addr ^= tmp;
	*val = rotate_right((*val^tmp),4);
}

void encryptcode(u32 *seeds, u32 *code) {
	u32 addr,val;
	u32 tmp,tmp2;
	int i=31;

	getcode(code,&val,&addr);
	scramble1(&addr,&val);
	while (i >= 0) {
		tmp2 = (addr^seeds[i--]);
		tmp = (rotate_right(addr,4)^seeds[i--]);
		val ^= (table6[tmp&0x3F]^table4[(tmp>>8)&0x3F]^table2[(tmp>>16)&0x3F]^table0[(tmp>>24)&0x3F]^table7[tmp2&0x3F]^table5[(tmp2>>8)&0x3F]^table3[(tmp2>>16)&0x3F]^table1[(tmp2>>24)&0x3F]);

		tmp2 = (val^seeds[i--]);
		tmp = (rotate_right(val,4)^seeds[i--]);
		addr ^= (table6[tmp&0x3F]^table4[(tmp>>8)&0x3F]^table2[(tmp>>16)&0x3F]^table0[(tmp>>24)&0x3F]^table7[tmp2&0x3F]^table5[(tmp2>>8)&0x3F]^table3[(tmp2>>16)&0x3F]^table1[(tmp2>>24)&0x3F]);
	}
	scramble2(&addr,&val);
	setcode(code,addr,val);
}

u8 batchencrypt(u32 *codes, u16 size) {
	u32 tmp,*ptr=codes;

	if (codes[0]>>28) return 0;

//	not required
//	if (size & 1) return 0;
//	if (!size) return 0;

	codes[0] |= (verifycode(codes,size)<<28);

	tmp = (size >> 1);
	while (tmp--) {
		encryptcode(genseeds,ptr);
		ptr+=2;
	}

	return 1;

	//unfinished
}