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-fixed a possible aes decrypt bug occuring when isfs actions are included (fixes mios installation)

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This commit is contained in:
fix94.1 2013-11-02 21:35:51 +00:00
parent e9c553de32
commit 62baf93d7c
4 changed files with 16 additions and 13 deletions
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14
source/hw/aes.c
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@ -31,13 +31,17 @@
u8 aes_mode = 0;
void AES_ResetEngine(void)
{
/* Reset Engine */
write32(HW_AES_CMD, 0x00000000);
while ((read32(HW_AES_CMD) & AES_CMD_FLAG_EXEC) != 0);
}
void AES_EnableDecrypt(const u8 *key, const u8 *iv)
{
const u32 *aes_iv = (const u32*)iv;
const u32 *aes_key = (const u32*)key;
/* Reset Engine */
write32(HW_AES_CMD, 0x00000000);
while ((read32(HW_AES_CMD) & AES_CMD_FLAG_EXEC) != 0);
/* write in IV and Key */
u8 i;
for(i = 0; i < 4; ++i)
@ -45,14 +49,14 @@ void AES_EnableDecrypt(const u8 *key, const u8 *iv)
write32(HW_AES_IV, *(aes_iv+i));
write32(HW_AES_KEY, *(aes_key+i));
}
/* set mode back to 0 */
aes_mode = 0;
}
#define AES_LIMIT 0x1000
static u8 AES_BUF[AES_LIMIT*16] ATTRIBUTE_ALIGN(16); /* 64KB */
void AES_Decrypt(u8 *inbuf, u8 *outbuf, u16 num_blocks)
{
/* set mode back to 0 */
aes_mode = 0;
/* split cause of limit */
u32 buf_pos = 0;
u16 blocks_done = 0;

1
source/hw/aes.h
View File

@ -17,6 +17,7 @@
#ifndef __AES_H__
#define __AES_H__
void AES_ResetEngine(void);
void AES_EnableDecrypt(const u8 *key, const u8 *iv);
void AES_Decrypt(u8 *inbuf, u8 *outbuf, u16 num_blocks);

10
source/libwbfs/wiidisc.c
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@ -31,15 +31,10 @@ void decrypt_title_key(u8 *tik, u8 *title_key)
wbfs_memset(iv, 0, sizeof iv);
wbfs_memcpy(iv, tik + 0x01dc, 8);
AES_ResetEngine();
//check byte 0x1f1 in ticket to determine whether or not to use Korean Common Key
//if value = 0x01, use Korean Common Key, else just use regular one
u8 korean_flag = tik[0x01f1];
if(korean_flag == 1)
AES_EnableDecrypt(korean_key, iv);
else
AES_EnableDecrypt(common_key, iv);
AES_EnableDecrypt((tik[0x01f1] == 1) ? korean_key : common_key, iv);
AES_Decrypt(tik + 0x01bf, title_key, 1);
}
@ -87,6 +82,7 @@ static void partition_read_block(wiidisc_t *d, u32 blockno, u8 *block)
partition_raw_read(d,offset, raw, 0x8000);
// decrypt data
AES_ResetEngine();
memcpy(iv, raw + 0x3d0, 16);
AES_EnableDecrypt(d->disc_key, iv);
AES_Decrypt(raw + 0x400, block, 0x7c0);

4
source/menu/menu_wad.cpp
View File

@ -196,7 +196,7 @@ int installWad(const char *path)
SHA1_CTX ctx;
SHA1Init(&ctx);
AES_EnableDecrypt(tik_key, aes_iv);
AES_ResetEngine();
u32 size_enc_full = ALIGN(16, content->size);
while(read < size_enc_full)
{
@ -206,6 +206,8 @@ int installWad(const char *path)
u16 num_blocks = (size_enc / 16);
fread(AES_WAD_Buf, size_enc, 1, wad_file);
AES_EnableDecrypt(tik_key, aes_iv); //ISFS seems to reset it?
memcpy(aes_iv, AES_WAD_Buf+(size_enc-16), 16); //last block for cbc
AES_Decrypt(AES_WAD_Buf, AES_WAD_Buf, num_blocks);
u64 size_dec = (content->size - read);