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bdk: se: expose xts functions and add nx xts

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CTCaer 2022-01-20 12:28:26 +02:00
parent 0e35e68fd5
commit c1441a64c7
2 changed files with 76 additions and 5 deletions
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78
bdk/sec/se.c
View file

@ -51,6 +51,22 @@ static void _gf256_mul_x(void *block)
pdata[0xF] ^= 0x87;
}
static void _gf256_mul_x_le(void *block)
{
u32 *pdata = (u32 *)block;
u32 carry = 0;
for (u32 i = 0; i < 4; i++)
{
u32 b = pdata[i];
pdata[i] = (b << 1) | carry;
carry = b >> 31;
}
if (carry)
pdata[0x0] ^= 0x87;
}
static void _se_ll_init(se_ll_t *ll, u32 addr, u32 size)
{
ll->num = 0;
@ -361,7 +377,7 @@ int se_aes_crypt_ctr(u32 ks, void *dst, u32 dst_size, const void *src, u32 src_s
return 1;
}
int se_aes_xts_crypt_sec(u32 ks1, u32 ks2, u32 enc, u64 sec, void *dst, void *src, u32 secsize)
int se_aes_xts_crypt_sec(u32 tweak_ks, u32 crypt_ks, u32 enc, u64 sec, void *dst, void *src, u32 secsize)
{
int res = 0;
u8 *tweak = (u8 *)malloc(SE_AES_BLOCK_SIZE);
@ -374,7 +390,7 @@ int se_aes_xts_crypt_sec(u32 ks1, u32 ks2, u32 enc, u64 sec, void *dst, void *sr
tweak[i] = sec & 0xFF;
sec >>= 8;
}
if (!se_aes_crypt_block_ecb(ks1, ENCRYPT, tweak, tweak))
if (!se_aes_crypt_block_ecb(tweak_ks, ENCRYPT, tweak, tweak))
goto out;
// We are assuming a 0x10-aligned sector size in this implementation.
@ -382,7 +398,7 @@ int se_aes_xts_crypt_sec(u32 ks1, u32 ks2, u32 enc, u64 sec, void *dst, void *sr
{
for (u32 j = 0; j < SE_AES_BLOCK_SIZE; j++)
pdst[j] = psrc[j] ^ tweak[j];
if (!se_aes_crypt_block_ecb(ks2, enc, pdst, pdst))
if (!se_aes_crypt_block_ecb(crypt_ks, enc, pdst, pdst))
goto out;
for (u32 j = 0; j < SE_AES_BLOCK_SIZE; j++)
pdst[j] = pdst[j] ^ tweak[j];
@ -398,13 +414,65 @@ out:;
return res;
}
int se_aes_xts_crypt(u32 ks1, u32 ks2, u32 enc, u64 sec, void *dst, void *src, u32 secsize, u32 num_secs)
int se_aes_xts_crypt_sec_nx(u32 tweak_ks, u32 crypt_ks, u32 enc, u64 sec, u8 *tweak, bool regen_tweak, u32 tweak_exp, void *dst, void *src, u32 sec_size)
{
u32 *pdst = (u32 *)dst;
u32 *psrc = (u32 *)src;
u32 *ptweak = (u32 *)tweak;
if (regen_tweak)
{
for (int i = 0xF; i >= 0; i--)
{
tweak[i] = sec & 0xFF;
sec >>= 8;
}
if (!se_aes_crypt_block_ecb(tweak_ks, ENCRYPT, tweak, tweak))
return 0;
}
// tweak_exp allows using a saved tweak to reduce _gf256_mul_x_le calls.
for (u32 i = 0; i < (tweak_exp << 5); i++)
_gf256_mul_x_le(tweak);
u8 orig_tweak[SE_KEY_128_SIZE] __attribute__((aligned(4)));
memcpy(orig_tweak, tweak, SE_KEY_128_SIZE);
// We are assuming a 16 sector aligned size in this implementation.
for (u32 i = 0; i < (sec_size >> 4); i++)
{
for (u32 j = 0; j < 4; j++)
pdst[j] = psrc[j] ^ ptweak[j];
_gf256_mul_x_le(tweak);
psrc += 4;
pdst += 4;
}
if (!se_aes_crypt_ecb(crypt_ks, enc, dst, sec_size, dst, sec_size))
return 0;
pdst = (u32 *)dst;
ptweak = (u32 *)orig_tweak;
for (u32 i = 0; i < (sec_size >> 4); i++)
{
for (u32 j = 0; j < 4; j++)
pdst[j] = pdst[j] ^ ptweak[j];
_gf256_mul_x_le(orig_tweak);
pdst += 4;
}
return 1;
}
int se_aes_xts_crypt(u32 tweak_ks, u32 crypt_ks, u32 enc, u64 sec, void *dst, void *src, u32 secsize, u32 num_secs)
{
u8 *pdst = (u8 *)dst;
u8 *psrc = (u8 *)src;
for (u32 i = 0; i < num_secs; i++)
if (!se_aes_xts_crypt_sec(ks1, ks2, enc, sec + i, pdst + secsize * i, psrc + secsize * i, secsize))
if (!se_aes_xts_crypt_sec(tweak_ks, crypt_ks, enc, sec + i, pdst + secsize * i, psrc + secsize * i, secsize))
return 0;
return 1;

3
bdk/sec/se.h
View file

@ -34,6 +34,9 @@ int se_aes_unwrap_key(u32 ks_dst, u32 ks_src, const void *input);
int se_aes_crypt_cbc(u32 ks, u32 enc, void *dst, u32 dst_size, const void *src, u32 src_size);
int se_aes_crypt_ecb(u32 ks, u32 enc, void *dst, u32 dst_size, const void *src, u32 src_size);
int se_aes_crypt_block_ecb(u32 ks, u32 enc, void *dst, const void *src);
int se_aes_xts_crypt_sec(u32 tweak_ks, u32 crypt_ks, u32 enc, u64 sec, void *dst, void *src, u32 secsize);
int se_aes_xts_crypt_sec_nx(u32 tweak_ks, u32 crypt_ks, u32 enc, u64 sec, u8 *tweak, bool regen_tweak, u32 tweak_exp, void *dst, void *src, u32 sec_size);
int se_aes_xts_crypt(u32 tweak_ks, u32 crypt_ks, u32 enc, u64 sec, void *dst, void *src, u32 secsize, u32 num_secs);
int se_aes_crypt_ctr(u32 ks, void *dst, u32 dst_size, const void *src, u32 src_size, void *ctr);
int se_calc_sha256(void *hash, u32 *msg_left, const void *src, u32 src_size, u64 total_size, u32 sha_cfg, bool is_oneshot);
int se_calc_sha256_oneshot(void *hash, const void *src, u32 src_size);