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crypto: chcr - Add fallback for AEAD algos

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Fallback to sw when
    I AAD length greater than 511
    II Zero length payload
    II No of sg entries exceeds Request size.

Signed-off-by: Harsh Jain <harsh@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Harsh Jain 2017-04-10 18:24:01 +05:30 committed by Herbert Xu
parent 72a56ca97d
commit 0e93708dab
3 changed files with 150 additions and 74 deletions
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217
drivers/crypto/chelsio/chcr_algo.c
View File

@ -1343,7 +1343,36 @@ static int chcr_copy_assoc(struct aead_request *req,
return crypto_skcipher_encrypt(skreq);
}
static int chcr_aead_need_fallback(struct aead_request *req, int src_nent,
int aadmax, int wrlen,
unsigned short op_type)
{
unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
if (((req->cryptlen - (op_type ? authsize : 0)) == 0) ||
(req->assoclen > aadmax) ||
(src_nent > MAX_SKB_FRAGS) ||
(wrlen > MAX_WR_SIZE))
return 1;
return 0;
}
static int chcr_aead_fallback(struct aead_request *req, unsigned short op_type)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct chcr_context *ctx = crypto_aead_ctx(tfm);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
struct aead_request *subreq = aead_request_ctx(req);
aead_request_set_tfm(subreq, aeadctx->sw_cipher);
aead_request_set_callback(subreq, req->base.flags,
req->base.complete, req->base.data);
aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
req->iv);
aead_request_set_ad(subreq, req->assoclen);
return op_type ? crypto_aead_decrypt(subreq) :
crypto_aead_encrypt(subreq);
}
static struct sk_buff *create_authenc_wr(struct aead_request *req,
unsigned short qid,
@ -1367,7 +1396,7 @@ static struct sk_buff *create_authenc_wr(struct aead_request *req,
unsigned short stop_offset = 0;
unsigned int assoclen = req->assoclen;
unsigned int authsize = crypto_aead_authsize(tfm);
int err = 0;
int err = -EINVAL, src_nent;
int null = 0;
gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
@ -1377,8 +1406,8 @@ static struct sk_buff *create_authenc_wr(struct aead_request *req,
if (op_type && req->cryptlen < crypto_aead_authsize(tfm))
goto err;
if (sg_nents_for_len(req->src, req->assoclen + req->cryptlen) < 0)
src_nent = sg_nents_for_len(req->src, req->assoclen + req->cryptlen);
if (src_nent < 0)
goto err;
src = scatterwalk_ffwd(reqctx->srcffwd, req->src, req->assoclen);
reqctx->dst = src;
@ -1396,7 +1425,7 @@ static struct sk_buff *create_authenc_wr(struct aead_request *req,
}
reqctx->dst_nents = sg_nents_for_len(reqctx->dst, req->cryptlen +
(op_type ? -authsize : authsize));
if (reqctx->dst_nents <= 0) {
if (reqctx->dst_nents < 0) {
pr_err("AUTHENC:Invalid Destination sg entries\n");
goto err;
}
@ -1404,6 +1433,12 @@ static struct sk_buff *create_authenc_wr(struct aead_request *req,
kctx_len = (ntohl(KEY_CONTEXT_CTX_LEN_V(aeadctx->key_ctx_hdr)) << 4)
- sizeof(chcr_req->key_ctx);
transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, dst_size);
if (chcr_aead_need_fallback(req, src_nent + MIN_AUTH_SG,
T6_MAX_AAD_SIZE,
transhdr_len + (sgl_len(src_nent + MIN_AUTH_SG) * 8),
op_type)) {
return ERR_PTR(chcr_aead_fallback(req, op_type));
}
skb = alloc_skb((transhdr_len + sizeof(struct sge_opaque_hdr)), flags);
if (!skb)
goto err;
@ -1485,24 +1520,6 @@ err:
return ERR_PTR(-EINVAL);
}
static void aes_gcm_empty_pld_pad(struct scatterlist *sg,
unsigned short offset)
{
struct page *spage;
unsigned char *addr;
spage = sg_page(sg);
get_page(spage); /* so that it is not freed by NIC */
#ifdef KMAP_ATOMIC_ARGS
addr = kmap_atomic(spage, KM_SOFTIRQ0);
#else
addr = kmap_atomic(spage);
#endif
memset(addr + sg->offset, 0, offset + 1);
kunmap_atomic(addr);
}
static int set_msg_len(u8 *block, unsigned int msglen, int csize)
{
__be32 data;
@ -1566,11 +1583,6 @@ static int ccm_format_packet(struct aead_request *req,
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
int rc = 0;
if (req->assoclen > T5_MAX_AAD_SIZE) {
pr_err("CCM: Unsupported AAD data. It should be < %d\n",
T5_MAX_AAD_SIZE);
return -EINVAL;
}
if (sub_type == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4309) {
reqctx->iv[0] = 3;
memcpy(reqctx->iv + 1, &aeadctx->salt[0], 3);
@ -1715,16 +1727,17 @@ static struct sk_buff *create_aead_ccm_wr(struct aead_request *req,
unsigned int dst_size = 0, kctx_len;
unsigned int sub_type;
unsigned int authsize = crypto_aead_authsize(tfm);
int err = 0;
int err = -EINVAL, src_nent;
gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
if (op_type && req->cryptlen < crypto_aead_authsize(tfm))
goto err;
if (sg_nents_for_len(req->src, req->assoclen + req->cryptlen) < 0)
src_nent = sg_nents_for_len(req->src, req->assoclen + req->cryptlen);
if (src_nent < 0)
goto err;
sub_type = get_aead_subtype(tfm);
src = scatterwalk_ffwd(reqctx->srcffwd, req->src, req->assoclen);
reqctx->dst = src;
@ -1740,7 +1753,7 @@ static struct sk_buff *create_aead_ccm_wr(struct aead_request *req,
}
reqctx->dst_nents = sg_nents_for_len(reqctx->dst, req->cryptlen +
(op_type ? -authsize : authsize));
if (reqctx->dst_nents <= 0) {
if (reqctx->dst_nents < 0) {
pr_err("CCM:Invalid Destination sg entries\n");
goto err;
}
@ -1752,6 +1765,13 @@ static struct sk_buff *create_aead_ccm_wr(struct aead_request *req,
dst_size = get_space_for_phys_dsgl(reqctx->dst_nents);
kctx_len = ((DIV_ROUND_UP(aeadctx->enckey_len, 16)) << 4) * 2;
transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, dst_size);
if (chcr_aead_need_fallback(req, src_nent + MIN_CCM_SG,
T6_MAX_AAD_SIZE - 18,
transhdr_len + (sgl_len(src_nent + MIN_CCM_SG) * 8),
op_type)) {
return ERR_PTR(chcr_aead_fallback(req, op_type));
}
skb = alloc_skb((transhdr_len + sizeof(struct sge_opaque_hdr)), flags);
if (!skb)
@ -1816,7 +1836,7 @@ static struct sk_buff *create_gcm_wr(struct aead_request *req,
unsigned char tag_offset = 0;
unsigned int crypt_len = 0;
unsigned int authsize = crypto_aead_authsize(tfm);
int err = 0;
int err = -EINVAL, src_nent;
gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
@ -1826,8 +1846,8 @@ static struct sk_buff *create_gcm_wr(struct aead_request *req,
if (op_type && req->cryptlen < crypto_aead_authsize(tfm))
goto err;
if (sg_nents_for_len(req->src, req->assoclen + req->cryptlen) < 0)
src_nent = sg_nents_for_len(req->src, req->assoclen + req->cryptlen);
if (src_nent < 0)
goto err;
src = scatterwalk_ffwd(reqctx->srcffwd, req->src, req->assoclen);
@ -1849,7 +1869,7 @@ static struct sk_buff *create_gcm_wr(struct aead_request *req,
crypt_len = req->cryptlen;
reqctx->dst_nents = sg_nents_for_len(reqctx->dst, req->cryptlen +
(op_type ? -authsize : authsize));
if (reqctx->dst_nents <= 0) {
if (reqctx->dst_nents < 0) {
pr_err("GCM:Invalid Destination sg entries\n");
goto err;
}
@ -1859,6 +1879,12 @@ static struct sk_buff *create_gcm_wr(struct aead_request *req,
kctx_len = ((DIV_ROUND_UP(aeadctx->enckey_len, 16)) << 4) +
AEAD_H_SIZE;
transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, dst_size);
if (chcr_aead_need_fallback(req, src_nent + MIN_GCM_SG,
T6_MAX_AAD_SIZE,
transhdr_len + (sgl_len(src_nent + MIN_GCM_SG) * 8),
op_type)) {
return ERR_PTR(chcr_aead_fallback(req, op_type));
}
skb = alloc_skb((transhdr_len + sizeof(struct sge_opaque_hdr)), flags);
if (!skb)
goto err;
@ -1876,11 +1902,11 @@ static struct sk_buff *create_gcm_wr(struct aead_request *req,
chcr_req->sec_cpl.op_ivinsrtofst = FILL_SEC_CPL_OP_IVINSR(
ctx->dev->rx_channel_id, 2, (ivsize ?
(req->assoclen + 1) : 0));
chcr_req->sec_cpl.pldlen = htonl(req->assoclen + ivsize + crypt_len);
chcr_req->sec_cpl.pldlen =
htonl(req->assoclen + ivsize + req->cryptlen);
chcr_req->sec_cpl.aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
req->assoclen ? 1 : 0, req->assoclen,
req->assoclen + ivsize + 1, 0);
if (req->cryptlen) {
chcr_req->sec_cpl.cipherstop_lo_authinsert =
FILL_SEC_CPL_AUTHINSERT(0, req->assoclen + ivsize + 1,
tag_offset, tag_offset);
@ -1890,15 +1916,6 @@ static struct sk_buff *create_gcm_wr(struct aead_request *req,
CHCR_SCMD_CIPHER_MODE_AES_GCM,
CHCR_SCMD_AUTH_MODE_GHASH,
aeadctx->hmac_ctrl, ivsize >> 1);
} else {
chcr_req->sec_cpl.cipherstop_lo_authinsert =
FILL_SEC_CPL_AUTHINSERT(0, 0, 0, 0);
chcr_req->sec_cpl.seqno_numivs =
FILL_SEC_CPL_SCMD0_SEQNO(op_type,
(op_type == CHCR_ENCRYPT_OP) ?
1 : 0, CHCR_SCMD_CIPHER_MODE_AES_CBC,
0, 0, ivsize >> 1);
}
chcr_req->sec_cpl.ivgen_hdrlen = FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 1,
0, 1, dst_size);
chcr_req->key_ctx.ctx_hdr = aeadctx->key_ctx_hdr;
@ -1931,15 +1948,7 @@ static struct sk_buff *create_gcm_wr(struct aead_request *req,
write_sg_to_skb(skb, &frags, req->src, req->assoclen);
write_buffer_to_skb(skb, &frags, reqctx->iv, ivsize);
if (req->cryptlen) {
write_sg_to_skb(skb, &frags, src, req->cryptlen);
} else {
aes_gcm_empty_pld_pad(req->dst, authsize - 1);
write_sg_to_skb(skb, &frags, reqctx->dst, crypt_len);
}
write_sg_to_skb(skb, &frags, src, req->cryptlen);
create_wreq(ctx, chcr_req, req, skb, kctx_len, size, 1,
sizeof(struct cpl_rx_phys_dsgl) + dst_size);
reqctx->skb = skb;
@ -1960,8 +1969,15 @@ static int chcr_aead_cra_init(struct crypto_aead *tfm)
{
struct chcr_context *ctx = crypto_aead_ctx(tfm);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
struct aead_alg *alg = crypto_aead_alg(tfm);
crypto_aead_set_reqsize(tfm, sizeof(struct chcr_aead_reqctx));
aeadctx->sw_cipher = crypto_alloc_aead(alg->base.cra_name, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(aeadctx->sw_cipher))
return PTR_ERR(aeadctx->sw_cipher);
crypto_aead_set_reqsize(tfm, max(sizeof(struct chcr_aead_reqctx),
sizeof(struct aead_request) +
crypto_aead_reqsize(aeadctx->sw_cipher)));
aeadctx->null = crypto_get_default_null_skcipher();
if (IS_ERR(aeadctx->null))
return PTR_ERR(aeadctx->null);
@ -1970,7 +1986,11 @@ static int chcr_aead_cra_init(struct crypto_aead *tfm)
static void chcr_aead_cra_exit(struct crypto_aead *tfm)
{
struct chcr_context *ctx = crypto_aead_ctx(tfm);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
crypto_put_default_null_skcipher();
crypto_free_aead(aeadctx->sw_cipher);
}
static int chcr_authenc_null_setauthsize(struct crypto_aead *tfm,
@ -1980,7 +2000,7 @@ static int chcr_authenc_null_setauthsize(struct crypto_aead *tfm,
aeadctx->hmac_ctrl = CHCR_SCMD_HMAC_CTRL_NOP;
aeadctx->mayverify = VERIFY_HW;
return 0;
return crypto_aead_setauthsize(aeadctx->sw_cipher, authsize);
}
static int chcr_authenc_setauthsize(struct crypto_aead *tfm,
unsigned int authsize)
@ -2017,7 +2037,7 @@ static int chcr_authenc_setauthsize(struct crypto_aead *tfm,
aeadctx->hmac_ctrl = CHCR_SCMD_HMAC_CTRL_NO_TRUNC;
aeadctx->mayverify = VERIFY_SW;
}
return 0;
return crypto_aead_setauthsize(aeadctx->sw_cipher, authsize);
}
@ -2057,7 +2077,7 @@ static int chcr_gcm_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
return 0;
return crypto_aead_setauthsize(aeadctx->sw_cipher, authsize);
}
static int chcr_4106_4309_setauthsize(struct crypto_aead *tfm,
@ -2083,7 +2103,7 @@ static int chcr_4106_4309_setauthsize(struct crypto_aead *tfm,
CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
return 0;
return crypto_aead_setauthsize(aeadctx->sw_cipher, authsize);
}
static int chcr_ccm_setauthsize(struct crypto_aead *tfm,
@ -2125,10 +2145,10 @@ static int chcr_ccm_setauthsize(struct crypto_aead *tfm,
CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
return 0;
return crypto_aead_setauthsize(aeadctx->sw_cipher, authsize);
}
static int chcr_aead_ccm_setkey(struct crypto_aead *aead,
static int chcr_ccm_common_setkey(struct crypto_aead *aead,
const u8 *key,
unsigned int keylen)
{
@ -2137,8 +2157,6 @@ static int chcr_aead_ccm_setkey(struct crypto_aead *aead,
unsigned char ck_size, mk_size;
int key_ctx_size = 0;
memcpy(aeadctx->key, key, keylen);
aeadctx->enckey_len = keylen;
key_ctx_size = sizeof(struct _key_ctx) +
((DIV_ROUND_UP(keylen, 16)) << 4) * 2;
if (keylen == AES_KEYSIZE_128) {
@ -2158,9 +2176,32 @@ static int chcr_aead_ccm_setkey(struct crypto_aead *aead,
}
aeadctx->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size, mk_size, 0, 0,
key_ctx_size >> 4);
memcpy(aeadctx->key, key, keylen);
aeadctx->enckey_len = keylen;
return 0;
}
static int chcr_aead_ccm_setkey(struct crypto_aead *aead,
const u8 *key,
unsigned int keylen)
{
struct chcr_context *ctx = crypto_aead_ctx(aead);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
int error;
crypto_aead_clear_flags(aeadctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
crypto_aead_set_flags(aeadctx->sw_cipher, crypto_aead_get_flags(aead) &
CRYPTO_TFM_REQ_MASK);
error = crypto_aead_setkey(aeadctx->sw_cipher, key, keylen);
crypto_aead_clear_flags(aead, CRYPTO_TFM_RES_MASK);
crypto_aead_set_flags(aead, crypto_aead_get_flags(aeadctx->sw_cipher) &
CRYPTO_TFM_RES_MASK);
if (error)
return error;
return chcr_ccm_common_setkey(aead, key, keylen);
}
static int chcr_aead_rfc4309_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
@ -2175,7 +2216,7 @@ static int chcr_aead_rfc4309_setkey(struct crypto_aead *aead, const u8 *key,
}
keylen -= 3;
memcpy(aeadctx->salt, key + keylen, 3);
return chcr_aead_ccm_setkey(aead, key, keylen);
return chcr_ccm_common_setkey(aead, key, keylen);
}
static int chcr_gcm_setkey(struct crypto_aead *aead, const u8 *key,
@ -2188,6 +2229,17 @@ static int chcr_gcm_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int ck_size;
int ret = 0, key_ctx_size = 0;
aeadctx->enckey_len = 0;
crypto_aead_clear_flags(aeadctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
crypto_aead_set_flags(aeadctx->sw_cipher, crypto_aead_get_flags(aead)
& CRYPTO_TFM_REQ_MASK);
ret = crypto_aead_setkey(aeadctx->sw_cipher, key, keylen);
crypto_aead_clear_flags(aead, CRYPTO_TFM_RES_MASK);
crypto_aead_set_flags(aead, crypto_aead_get_flags(aeadctx->sw_cipher) &
CRYPTO_TFM_RES_MASK);
if (ret)
goto out;
if (get_aead_subtype(aead) == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4106 &&
keylen > 3) {
keylen -= 4; /* nonce/salt is present in the last 4 bytes */
@ -2202,8 +2254,7 @@ static int chcr_gcm_setkey(struct crypto_aead *aead, const u8 *key,
} else {
crypto_tfm_set_flags((struct crypto_tfm *)aead,
CRYPTO_TFM_RES_BAD_KEY_LEN);
aeadctx->enckey_len = 0;
pr_err("GCM: Invalid key length %d", keylen);
pr_err("GCM: Invalid key length %d\n", keylen);
ret = -EINVAL;
goto out;
}
@ -2259,6 +2310,16 @@ static int chcr_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
int align;
u8 *o_ptr = NULL;
crypto_aead_clear_flags(aeadctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
crypto_aead_set_flags(aeadctx->sw_cipher, crypto_aead_get_flags(authenc)
& CRYPTO_TFM_REQ_MASK);
err = crypto_aead_setkey(aeadctx->sw_cipher, key, keylen);
crypto_aead_clear_flags(authenc, CRYPTO_TFM_RES_MASK);
crypto_aead_set_flags(authenc, crypto_aead_get_flags(aeadctx->sw_cipher)
& CRYPTO_TFM_RES_MASK);
if (err)
goto out;
if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) {
crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
goto out;
@ -2291,7 +2352,8 @@ static int chcr_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
base_hash = chcr_alloc_shash(max_authsize);
if (IS_ERR(base_hash)) {
pr_err("chcr : Base driver cannot be loaded\n");
goto out;
aeadctx->enckey_len = 0;
return -EINVAL;
}
{
SHASH_DESC_ON_STACK(shash, base_hash);
@ -2358,11 +2420,21 @@ static int chcr_aead_digest_null_setkey(struct crypto_aead *authenc,
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
struct chcr_authenc_ctx *actx = AUTHENC_CTX(aeadctx);
struct crypto_authenc_keys keys;
int err;
/* it contains auth and cipher key both*/
int key_ctx_len = 0;
unsigned char ck_size = 0;
crypto_aead_clear_flags(aeadctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
crypto_aead_set_flags(aeadctx->sw_cipher, crypto_aead_get_flags(authenc)
& CRYPTO_TFM_REQ_MASK);
err = crypto_aead_setkey(aeadctx->sw_cipher, key, keylen);
crypto_aead_clear_flags(authenc, CRYPTO_TFM_RES_MASK);
crypto_aead_set_flags(authenc, crypto_aead_get_flags(aeadctx->sw_cipher)
& CRYPTO_TFM_RES_MASK);
if (err)
goto out;
if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) {
crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
goto out;
@ -2469,10 +2541,8 @@ static int chcr_aead_op(struct aead_request *req,
skb = create_wr_fn(req, u_ctx->lldi.rxq_ids[ctx->rx_qidx], size,
op_type);
if (IS_ERR(skb) || skb == NULL) {
pr_err("chcr : %s : failed to form WR. No memory\n", __func__);
if (IS_ERR(skb) || !skb)
return PTR_ERR(skb);
}
skb->dev = u_ctx->lldi.ports[0];
set_wr_txq(skb, CPL_PRIORITY_DATA, ctx->tx_qidx);
@ -2921,7 +2991,8 @@ static int chcr_register_alg(void)
break;
case CRYPTO_ALG_TYPE_AEAD:
driver_algs[i].alg.aead.base.cra_flags =
CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK;
driver_algs[i].alg.aead.encrypt = chcr_aead_encrypt;
driver_algs[i].alg.aead.decrypt = chcr_aead_decrypt;
driver_algs[i].alg.aead.init = chcr_aead_cra_init;

4
drivers/crypto/chelsio/chcr_algo.h
View File

@ -218,6 +218,10 @@
#define MAX_NK 8
#define CRYPTO_MAX_IMM_TX_PKT_LEN 256
#define MAX_WR_SIZE 512
#define MIN_AUTH_SG 2 /*IV + AAD*/
#define MIN_GCM_SG 2 /* IV + AAD*/
#define MIN_CCM_SG 3 /*IV+AAD+B0*/
struct algo_param {
unsigned int auth_mode;

3
drivers/crypto/chelsio/chcr_crypto.h
View File

@ -41,7 +41,7 @@
#define CCM_B0_SIZE 16
#define CCM_AAD_FIELD_SIZE 2
#define T5_MAX_AAD_SIZE 512
#define T6_MAX_AAD_SIZE 511
/* Define following if h/w is not dropping the AAD and IV data before
@ -188,6 +188,7 @@ struct chcr_aead_ctx {
__be32 key_ctx_hdr;
unsigned int enckey_len;
struct crypto_skcipher *null;
struct crypto_aead *sw_cipher;
u8 salt[MAX_SALT];
u8 key[CHCR_AES_MAX_KEY_LEN];
u16 hmac_ctrl;