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se: Improve general xts function

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This commit is contained in:
shchmue 2020-05-08 15:22:47 -06:00
parent a120e97e08
commit b147f34c53
1 changed files with 25 additions and 11 deletions
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36
source/sec/se.c
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@ -19,6 +19,7 @@
#include <string.h> #include <string.h>
#include "../../common/memory_map.h"
#include "../sec/se.h" #include "../sec/se.h"
#include "../mem/heap.h" #include "../mem/heap.h"
#include "../soc/bpmp.h" #include "../soc/bpmp.h"
@ -94,7 +95,7 @@ static int _se_wait()
static int _se_execute(u32 op, void *dst, u32 dst_size, const void *src, u32 src_size) static int _se_execute(u32 op, void *dst, u32 dst_size, const void *src, u32 src_size)
{ {
se_ll_t *ll_dst = (se_ll_t *)0xECFFFFE0, *ll_src = (se_ll_t *)0xECFFFFF0; se_ll_t *ll_dst = (se_ll_t *)(NYX_STORAGE_ADDR - 0x20), *ll_src = (se_ll_t *)(NYX_STORAGE_ADDR - 0x10);
if (dst) if (dst)
{ {
@ -324,8 +325,10 @@ int se_aes_xts_crypt_sec(u32 ks1, u32 ks2, u32 enc, u64 sec, void *dst, const vo
{ {
int res = 0; int res = 0;
u8 *tweak = (u8 *)malloc(0x10); u8 *tweak = (u8 *)malloc(0x10);
u8 *pdst = (u8 *)dst; u8 *temptweak = (u8 *)malloc(0x10);
u8 *psrc = (u8 *)src; u32 *pdst = (u32 *)dst;
u32 *psrc = (u32 *)src;
u32 *ptweak = (u32 *)tweak;
//Generate tweak. //Generate tweak.
for (int i = 0xF; i >= 0; i--) for (int i = 0xF; i >= 0; i--)
@ -336,23 +339,34 @@ int se_aes_xts_crypt_sec(u32 ks1, u32 ks2, u32 enc, u64 sec, void *dst, const vo
if (!se_aes_crypt_block_ecb(ks1, 1, tweak, tweak)) if (!se_aes_crypt_block_ecb(ks1, 1, tweak, tweak))
goto out; goto out;
memcpy(temptweak, tweak, 0x10);
//We are assuming a 0x10-aligned sector size in this implementation. //We are assuming a 0x10-aligned sector size in this implementation.
for (u32 i = 0; i < secsize / 0x10; i++) for (u32 i = 0; i < secsize / 0x10; i++)
{ {
for (u32 j = 0; j < 0x10; j++) for (u32 j = 0; j < 4; j++)
pdst[j] = psrc[j] ^ tweak[j]; pdst[j] = psrc[j] ^ ptweak[j];
if (!se_aes_crypt_block_ecb(ks2, enc, pdst, pdst))
goto out;
for (u32 j = 0; j < 0x10; j++)
pdst[j] = pdst[j] ^ tweak[j];
_gf256_mul_x_le(tweak); _gf256_mul_x_le(tweak);
psrc += 0x10; psrc += 4;
pdst += 0x10; pdst += 4;
}
se_aes_crypt_ecb(ks2, enc, dst, secsize, dst, secsize);
pdst = (u32 *)dst;
memcpy(tweak, temptweak, 0x10);
for (u32 i = 0; i < secsize / 0x10; i++) {
for (u32 j = 0; j < 4; j++)
pdst[j] = pdst[j] ^ ptweak[j];
_gf256_mul_x_le(tweak);
pdst += 4;
} }
res = 1; res = 1;
out:; out:;
free(temptweak);
free(tweak); free(tweak);
return res; return res;
} }