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chcr_ktls: use AES library for single use cipher 

Allocating a cipher via the crypto API only to free it again after using
it to encrypt a single block is unnecessary in cases where the algorithm
is known at compile time. So replace this pattern with a call to the AES
library.

Cc: Ayush Sawal <ayush.sawal@chelsio.com>
Cc: Vinay Kumar Yadav <vinay.yadav@chelsio.com>
Cc: Rohit Maheshwari <rohitm@chelsio.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2020-12-11 13:27:14 +01:00 committed by Herbert Xu
parent bbfd06c7c8
commit a3b01ffddc
2 changed files with 8 additions and 12 deletions
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1
drivers/net/ethernet/chelsio/inline_crypto/Kconfig
View File

@ -42,6 +42,7 @@ config CHELSIO_TLS_DEVICE
depends on CHELSIO_T4
depends on TLS
depends on TLS_DEVICE
select CRYPTO_LIB_AES
help
This flag enables support for kernel tls offload over Chelsio T6
crypto accelerator. CONFIG_CHELSIO_TLS_DEVICE flag can be enabled

19
drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c
View File

@ -9,6 +9,7 @@
#include <linux/ip.h>
#include <net/ipv6.h>
#include <linux/netdevice.h>
#include <crypto/aes.h>
#include "chcr_ktls.h"
static LIST_HEAD(uld_ctx_list);
@ -74,7 +75,7 @@ static int chcr_ktls_save_keys(struct chcr_ktls_info *tx_info,
unsigned char ghash_h[TLS_CIPHER_AES_GCM_256_TAG_SIZE];
struct tls12_crypto_info_aes_gcm_128 *info_128_gcm;
struct ktls_key_ctx *kctx = &tx_info->key_ctx;
struct crypto_cipher *cipher;
struct crypto_aes_ctx aes_ctx;
unsigned char *key, *salt;
switch (crypto_info->cipher_type) {
@ -135,18 +136,14 @@ static int chcr_ktls_save_keys(struct chcr_ktls_info *tx_info,
/* Calculate the H = CIPH(K, 0 repeated 16 times).
* It will go in key context
*/
cipher = crypto_alloc_cipher("aes", 0, 0);
if (IS_ERR(cipher)) {
ret = -ENOMEM;
goto out;
}
ret = crypto_cipher_setkey(cipher, key, keylen);
ret = aes_expandkey(&aes_ctx, key, keylen);
if (ret)
goto out1;
goto out;
memset(ghash_h, 0, ghash_size);
crypto_cipher_encrypt_one(cipher, ghash_h, ghash_h);
aes_encrypt(&aes_ctx, ghash_h, ghash_h);
memzero_explicit(&aes_ctx, sizeof(aes_ctx));
/* fill the Key context */
if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
@ -155,7 +152,7 @@ static int chcr_ktls_save_keys(struct chcr_ktls_info *tx_info,
key_ctx_size >> 4);
} else {
ret = -EINVAL;
goto out1;
goto out;
}
memcpy(kctx->salt, salt, tx_info->salt_size);
@ -163,8 +160,6 @@ static int chcr_ktls_save_keys(struct chcr_ktls_info *tx_info,
memcpy(kctx->key + keylen, ghash_h, ghash_size);
tx_info->key_ctx_len = key_ctx_size;
out1:
crypto_free_cipher(cipher);
out:
return ret;
}