mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-13 22:25:03 +00:00
Code Issues Releases Wiki Activity

crypto: inside-secure - Add support for the AES-XTS algorithm

Browse source 
This patch adds support for the AES-XTS skcipher algorithm.

Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Pascal van Leeuwen 2019-08-30 09:40:53 +02:00 committed by Herbert Xu
parent 93369b5d06
commit c7da38a71c
3 changed files with 123 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/crypto/inside-secure/safexcel.c
View file

@ -1004,6 +1004,7 @@ static struct safexcel_alg_template *safexcel_algs[] = {
&safexcel_alg_authenc_hmac_sha256_ctr_aes,
&safexcel_alg_authenc_hmac_sha384_ctr_aes,
&safexcel_alg_authenc_hmac_sha512_ctr_aes,
&safexcel_alg_xts_aes,
};
static int safexcel_register_algorithms(struct safexcel_crypto_priv *priv)

2
drivers/crypto/inside-secure/safexcel.h
View file

@ -334,6 +334,7 @@ struct safexcel_context_record {
#define CONTEXT_CONTROL_CRYPTO_MODE_ECB (0 << 0)
#define CONTEXT_CONTROL_CRYPTO_MODE_CBC (1 << 0)
#define CONTEXT_CONTROL_CRYPTO_MODE_CTR_LOAD (6 << 0)
#define CONTEXT_CONTROL_CRYPTO_MODE_XTS (7 << 0)
#define CONTEXT_CONTROL_IV0 BIT(5)
#define CONTEXT_CONTROL_IV1 BIT(6)
#define CONTEXT_CONTROL_IV2 BIT(7)
@ -750,5 +751,6 @@ extern struct safexcel_alg_template safexcel_alg_authenc_hmac_sha224_ctr_aes;
extern struct safexcel_alg_template safexcel_alg_authenc_hmac_sha256_ctr_aes;
extern struct safexcel_alg_template safexcel_alg_authenc_hmac_sha384_ctr_aes;
extern struct safexcel_alg_template safexcel_alg_authenc_hmac_sha512_ctr_aes;
extern struct safexcel_alg_template safexcel_alg_xts_aes;
#endif

124
drivers/crypto/inside-secure/safexcel_cipher.c
View file

@ -15,6 +15,7 @@
#include <crypto/ctr.h>
#include <crypto/internal/des.h>
#include <crypto/sha.h>
#include <crypto/xts.h>
#include <crypto/skcipher.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
@ -40,9 +41,9 @@ struct safexcel_cipher_ctx {
enum safexcel_cipher_alg alg;
bool aead;
__le32 key[8];
__le32 key[16];
u32 nonce;
unsigned int key_len;
unsigned int key_len, xts;
/* All the below is AEAD specific */
u32 hash_alg;
@ -351,7 +352,7 @@ static int safexcel_context_control(struct safexcel_cipher_ctx *ctx,
} else if (ctx->alg == SAFEXCEL_3DES) {
cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_3DES;
} else if (ctx->alg == SAFEXCEL_AES) {
switch (ctx->key_len) {
switch (ctx->key_len >> ctx->xts) {
case AES_KEYSIZE_128:
cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES128;
break;
@ -363,7 +364,7 @@ static int safexcel_context_control(struct safexcel_cipher_ctx *ctx,
break;
default:
dev_err(priv->dev, "aes keysize not supported: %u\n",
ctx->key_len);
ctx->key_len >> ctx->xts);
return -EINVAL;
}
}
@ -1747,3 +1748,118 @@ struct safexcel_alg_template safexcel_alg_authenc_hmac_sha384_ctr_aes = {
},
},
};
static int safexcel_skcipher_aesxts_setkey(struct crypto_skcipher *ctfm,
const u8 *key, unsigned int len)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(ctfm);
struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
struct safexcel_crypto_priv *priv = ctx->priv;
struct crypto_aes_ctx aes;
int ret, i;
unsigned int keylen;
/* Check for illegal XTS keys */
ret = xts_verify_key(ctfm, key, len);
if (ret)
return ret;
/* Only half of the key data is cipher key */
keylen = (len >> 1);
ret = aes_expandkey(&aes, key, keylen);
if (ret) {
crypto_skcipher_set_flags(ctfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return ret;
}
if (priv->flags & EIP197_TRC_CACHE && ctx->base.ctxr_dma) {
for (i = 0; i < keylen / sizeof(u32); i++) {
if (ctx->key[i] != cpu_to_le32(aes.key_enc[i])) {
ctx->base.needs_inv = true;
break;
}
}
}
for (i = 0; i < keylen / sizeof(u32); i++)
ctx->key[i] = cpu_to_le32(aes.key_enc[i]);
/* The other half is the tweak key */
ret = aes_expandkey(&aes, (u8 *)(key + keylen), keylen);
if (ret) {
crypto_skcipher_set_flags(ctfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return ret;
}
if (priv->flags & EIP197_TRC_CACHE && ctx->base.ctxr_dma) {
for (i = 0; i < keylen / sizeof(u32); i++) {
if (ctx->key[i + keylen / sizeof(u32)] !=
cpu_to_le32(aes.key_enc[i])) {
ctx->base.needs_inv = true;
break;
}
}
}
for (i = 0; i < keylen / sizeof(u32); i++)
ctx->key[i + keylen / sizeof(u32)] =
cpu_to_le32(aes.key_enc[i]);
ctx->key_len = keylen << 1;
memzero_explicit(&aes, sizeof(aes));
return 0;
}
static int safexcel_skcipher_aes_xts_cra_init(struct crypto_tfm *tfm)
{
struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
safexcel_skcipher_cra_init(tfm);
ctx->alg = SAFEXCEL_AES;
ctx->xts = 1;
ctx->mode = CONTEXT_CONTROL_CRYPTO_MODE_XTS;
return 0;
}
static int safexcel_encrypt_xts(struct skcipher_request *req)
{
if (req->cryptlen < XTS_BLOCK_SIZE)
return -EINVAL;
return safexcel_queue_req(&req->base, skcipher_request_ctx(req),
SAFEXCEL_ENCRYPT);
}
static int safexcel_decrypt_xts(struct skcipher_request *req)
{
if (req->cryptlen < XTS_BLOCK_SIZE)
return -EINVAL;
return safexcel_queue_req(&req->base, skcipher_request_ctx(req),
SAFEXCEL_DECRYPT);
}
struct safexcel_alg_template safexcel_alg_xts_aes = {
.type = SAFEXCEL_ALG_TYPE_SKCIPHER,
.alg.skcipher = {
.setkey = safexcel_skcipher_aesxts_setkey,
.encrypt = safexcel_encrypt_xts,
.decrypt = safexcel_decrypt_xts,
/* XTS actually uses 2 AES keys glued together */
.min_keysize = AES_MIN_KEY_SIZE * 2,
.max_keysize = AES_MAX_KEY_SIZE * 2,
.ivsize = XTS_BLOCK_SIZE,
.base = {
.cra_name = "xts(aes)",
.cra_driver_name = "safexcel-xts-aes",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = XTS_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct safexcel_cipher_ctx),
.cra_alignmask = 0,
.cra_init = safexcel_skcipher_aes_xts_cra_init,
.cra_exit = safexcel_skcipher_cra_exit,
.cra_module = THIS_MODULE,
},
},
};