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staging: rtl8723bs: use in-kernel aes encryption in OMAC1 routines

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replace private aes encryption subroutines with
public in-kernel ones in OMAC1 computation routines.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/11ac26487aab92ded28747c1f0cb42a94183130d.1620139727.git.fabioaiuto83@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fabio Aiuto 2021-05-04 16:51:39 +02:00 committed by Greg Kroah-Hartman
parent 41c014b865
commit 7d40753d88
1 changed files with 9 additions and 105 deletions
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114
drivers/staging/rtl8723bs/core/rtw_security.c
View file

@ -7,6 +7,7 @@
#include <linux/crc32poly.h>
#include <drv_types.h>
#include <rtw_debug.h>
#include <crypto/aes.h>
static const char * const _security_type_str[] = {
"N/A",
@ -1931,99 +1932,6 @@ const u8 rcons[] = {
/* for 128-bit blocks, Rijndael never uses more than 10 rcon values */
};
/*
* Expand the cipher key into the encryption key schedule.
*
* @return the number of rounds for the given cipher key size.
*/
static void rijndaelKeySetupEnc(u32 rk[/*44*/], const u8 cipherKey[])
{
int i;
u32 temp;
rk[0] = GETU32(cipherKey);
rk[1] = GETU32(cipherKey + 4);
rk[2] = GETU32(cipherKey + 8);
rk[3] = GETU32(cipherKey + 12);
for (i = 0; i < 10; i++) {
temp = rk[3];
rk[4] = rk[0] ^
TE421(temp) ^ TE432(temp) ^ TE443(temp) ^ TE414(temp) ^
RCON(i);
rk[5] = rk[1] ^ rk[4];
rk[6] = rk[2] ^ rk[5];
rk[7] = rk[3] ^ rk[6];
rk += 4;
}
}
static void rijndaelEncrypt(u32 rk[/*44*/], u8 pt[16], u8 ct[16])
{
u32 s0, s1, s2, s3, t0, t1, t2, t3;
int Nr = 10;
int r;
/*
* map byte array block to cipher state
* and add initial round key:
*/
s0 = GETU32(pt) ^ rk[0];
s1 = GETU32(pt + 4) ^ rk[1];
s2 = GETU32(pt + 8) ^ rk[2];
s3 = GETU32(pt + 12) ^ rk[3];
#define ROUND(i, d, s) \
do { \
d##0 = TE0(s##0) ^ TE1(s##1) ^ TE2(s##2) ^ TE3(s##3) ^ rk[4 * i]; \
d##1 = TE0(s##1) ^ TE1(s##2) ^ TE2(s##3) ^ TE3(s##0) ^ rk[4 * i + 1]; \
d##2 = TE0(s##2) ^ TE1(s##3) ^ TE2(s##0) ^ TE3(s##1) ^ rk[4 * i + 2]; \
d##3 = TE0(s##3) ^ TE1(s##0) ^ TE2(s##1) ^ TE3(s##2) ^ rk[4 * i + 3]; \
} while (0)
/* Nr - 1 full rounds: */
r = Nr >> 1;
for (;;) {
ROUND(1, t, s);
rk += 8;
if (--r == 0)
break;
ROUND(0, s, t);
}
#undef ROUND
/*
* apply last round and
* map cipher state to byte array block:
*/
s0 = TE41(t0) ^ TE42(t1) ^ TE43(t2) ^ TE44(t3) ^ rk[0];
PUTU32(ct, s0);
s1 = TE41(t1) ^ TE42(t2) ^ TE43(t3) ^ TE44(t0) ^ rk[1];
PUTU32(ct + 4, s1);
s2 = TE41(t2) ^ TE42(t3) ^ TE43(t0) ^ TE44(t1) ^ rk[2];
PUTU32(ct + 8, s2);
s3 = TE41(t3) ^ TE42(t0) ^ TE43(t1) ^ TE44(t2) ^ rk[3];
PUTU32(ct + 12, s3);
}
static void *aes_encrypt_init(u8 *key, size_t len)
{
u32 *rk;
if (len != 16)
return NULL;
rk = rtw_malloc(AES_PRIV_SIZE);
if (rk == NULL)
return NULL;
rijndaelKeySetupEnc(rk, key);
return rk;
}
static void aes_128_encrypt(void *ctx, u8 *plain, u8 *crypt)
{
rijndaelEncrypt(ctx, plain, crypt);
}
static void gf_mulx(u8 *pad)
{
int i, carry;
@ -2037,11 +1945,6 @@ static void gf_mulx(u8 *pad)
pad[AES_BLOCK_SIZE - 1] ^= 0x87;
}
static void aes_encrypt_deinit(void *ctx)
{
kfree_sensitive(ctx);
}
/**
* omac1_aes_128_vector - One-Key CBC MAC (OMAC1) hash with AES-128
* @key: 128-bit key for the hash operation
@ -2058,13 +1961,14 @@ static void aes_encrypt_deinit(void *ctx)
static int omac1_aes_128_vector(u8 *key, size_t num_elem,
u8 *addr[], size_t *len, u8 *mac)
{
void *ctx;
struct crypto_aes_ctx ctx;
u8 cbc[AES_BLOCK_SIZE], pad[AES_BLOCK_SIZE];
u8 *pos, *end;
size_t i, e, left, total_len;
int ret;
ctx = aes_encrypt_init(key, 16);
if (ctx == NULL)
ret = aes_expandkey(&ctx, key, 16);
if (ret)
return -1;
memset(cbc, 0, AES_BLOCK_SIZE);
@ -2087,12 +1991,12 @@ static int omac1_aes_128_vector(u8 *key, size_t num_elem,
}
}
if (left > AES_BLOCK_SIZE)
aes_128_encrypt(ctx, cbc, cbc);
aes_encrypt(&ctx, cbc, cbc);
left -= AES_BLOCK_SIZE;
}
memset(pad, 0, AES_BLOCK_SIZE);
aes_128_encrypt(ctx, pad, pad);
aes_encrypt(&ctx, pad, pad);
gf_mulx(pad);
if (left || total_len == 0) {
@ -2110,8 +2014,8 @@ static int omac1_aes_128_vector(u8 *key, size_t num_elem,
for (i = 0; i < AES_BLOCK_SIZE; i++)
pad[i] ^= cbc[i];
aes_128_encrypt(ctx, pad, mac);
aes_encrypt_deinit(ctx);
aes_encrypt(&ctx, pad, mac);
memzero_explicit(&ctx, sizeof(ctx));
return 0;
}