mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-12-30 13:51:51 +01:00
95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/****************************************************************************
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* Copyright (C) 2013 FIX94
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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****************************************************************************/
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#include <string.h>
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#include <gctypes.h>
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#include <malloc.h>
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#include <ogc/cache.h>
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#include <ogc/system.h>
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#include <ogc/machine/processor.h>
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#include "loader/utils.h"
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#include "memory/memory.h"
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#include "aes.h"
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#define AES_CMD_FLAG_EXEC (1<<31)
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#define AES_CMD_FLAG_ENA (1<<28)
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#define AES_CMD_FLAG_DEC (1<<27)
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#define AES_CMD_FLAG_IV (1<<12)
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u8 aes_mode = 0;
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void AES_ResetEngine(void)
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{
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/* Reset Engine */
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write32(HW_AES_CMD, 0x00000000);
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while ((read32(HW_AES_CMD) & AES_CMD_FLAG_EXEC) != 0);
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}
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void AES_EnableDecrypt(const u8 *key, const u8 *iv)
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{
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const u32 *aes_iv = (const u32*)iv;
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const u32 *aes_key = (const u32*)key;
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/* write in IV and Key */
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u8 i;
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for(i = 0; i < 4; ++i)
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{
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write32(HW_AES_IV, *(aes_iv+i));
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write32(HW_AES_KEY, *(aes_key+i));
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}
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}
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#define AES_LIMIT 0x1000
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static u8 AES_BUF[AES_LIMIT*16] ATTRIBUTE_ALIGN(16); /* 64KB */
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void AES_Decrypt(u8 *inbuf, u8 *outbuf, u16 num_blocks)
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{
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/* set mode back to 0 */
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aes_mode = 0;
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/* split cause of limit */
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u32 buf_pos = 0;
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u16 blocks_done = 0;
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u32 buf_done = 0;
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u16 blocks_full = num_blocks;
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while(blocks_done < blocks_full)
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{
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/* Calculate Position */
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blocks_done = blocks_full;
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if(blocks_done > AES_LIMIT)
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blocks_done = AES_LIMIT;
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buf_done = blocks_done * 16;
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/* Copy into our aligned buffer */
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memcpy(AES_BUF, (inbuf + buf_pos), buf_done);
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/* Flush and Invalidate */
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DCFlushRange(AES_BUF, buf_done);
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ICInvalidateRange(AES_BUF, buf_done);
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/* set location */
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write32(HW_AES_SRC, (u32)MEM_VIRTUAL_TO_PHYSICAL(AES_BUF));
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write32(HW_AES_DEST, (u32)MEM_VIRTUAL_TO_PHYSICAL(AES_BUF));
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/* enable engine, set size, set iv flag and enable decryption */
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write32(HW_AES_CMD, AES_CMD_FLAG_ENA | AES_CMD_FLAG_DEC | AES_CMD_FLAG_EXEC |
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((aes_mode == 0) ? 0 : AES_CMD_FLAG_IV) | (blocks_done - 1));
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while (read32(HW_AES_CMD) & AES_CMD_FLAG_EXEC);
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/* set down num blocks */
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blocks_full -= blocks_done;
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/* increase aes mode to keep iv */
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if(aes_mode == 0) aes_mode++;
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/* flush and write outbuf */
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DCFlushRange(AES_BUF, buf_done);
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memcpy((outbuf + buf_pos), AES_BUF, buf_done);
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/* increase block pos */
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buf_pos += buf_done;
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}
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}
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