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n2_crypto: Add HMAC support. 

One note is that, unlike with non-HMAC hashes, we can't support
hmac(sha224) using the HMAC_SHA256 opcode.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2010-05-22 22:53:09 -07:00
parent 3a2c034697
commit dc4ccfd15d
1 changed files with 206 additions and 4 deletions
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210
drivers/crypto/n2_core.c
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@ -246,6 +246,7 @@ struct n2_ahash_alg {
u8 hw_op_hashsz;
u8 digest_size;
u8 auth_type;
u8 hmac_type;
struct ahash_alg alg;
};
@ -259,10 +260,36 @@ static inline struct n2_ahash_alg *n2_ahash_alg(struct crypto_tfm *tfm)
return container_of(ahash_alg, struct n2_ahash_alg, alg);
}
struct n2_hmac_alg {
const char *child_alg;
struct n2_ahash_alg derived;
};
static inline struct n2_hmac_alg *n2_hmac_alg(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
struct ahash_alg *ahash_alg;
ahash_alg = container_of(alg, struct ahash_alg, halg.base);
return container_of(ahash_alg, struct n2_hmac_alg, derived.alg);
}
struct n2_hash_ctx {
struct crypto_ahash *fallback_tfm;
};
#define N2_HASH_KEY_MAX 32 /* HW limit for all HMAC requests */
struct n2_hmac_ctx {
struct n2_hash_ctx base;
struct crypto_shash *child_shash;
int hash_key_len;
unsigned char hash_key[N2_HASH_KEY_MAX];
};
struct n2_hash_req_ctx {
union {
struct md5_state md5;
@ -362,6 +389,94 @@ static void n2_hash_cra_exit(struct crypto_tfm *tfm)
crypto_free_ahash(ctx->fallback_tfm);
}
static int n2_hmac_cra_init(struct crypto_tfm *tfm)
{
const char *fallback_driver_name = tfm->__crt_alg->cra_name;
struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
struct n2_hmac_ctx *ctx = crypto_ahash_ctx(ahash);
struct n2_hmac_alg *n2alg = n2_hmac_alg(tfm);
struct crypto_ahash *fallback_tfm;
struct crypto_shash *child_shash;
int err;
fallback_tfm = crypto_alloc_ahash(fallback_driver_name, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(fallback_tfm)) {
pr_warning("Fallback driver '%s' could not be loaded!\n",
fallback_driver_name);
err = PTR_ERR(fallback_tfm);
goto out;
}
child_shash = crypto_alloc_shash(n2alg->child_alg, 0, 0);
if (IS_ERR(child_shash)) {
pr_warning("Child shash '%s' could not be loaded!\n",
n2alg->child_alg);
err = PTR_ERR(child_shash);
goto out_free_fallback;
}
crypto_ahash_set_reqsize(ahash, (sizeof(struct n2_hash_req_ctx) +
crypto_ahash_reqsize(fallback_tfm)));
ctx->child_shash = child_shash;
ctx->base.fallback_tfm = fallback_tfm;
return 0;
out_free_fallback:
crypto_free_ahash(fallback_tfm);
out:
return err;
}
static void n2_hmac_cra_exit(struct crypto_tfm *tfm)
{
struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
struct n2_hmac_ctx *ctx = crypto_ahash_ctx(ahash);
crypto_free_ahash(ctx->base.fallback_tfm);
crypto_free_shash(ctx->child_shash);
}
static int n2_hmac_async_setkey(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen)
{
struct n2_hmac_ctx *ctx = crypto_ahash_ctx(tfm);
struct crypto_shash *child_shash = ctx->child_shash;
struct crypto_ahash *fallback_tfm;
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(child_shash)];
} desc;
int err, bs, ds;
fallback_tfm = ctx->base.fallback_tfm;
err = crypto_ahash_setkey(fallback_tfm, key, keylen);
if (err)
return err;
desc.shash.tfm = child_shash;
desc.shash.flags = crypto_ahash_get_flags(tfm) &
CRYPTO_TFM_REQ_MAY_SLEEP;
bs = crypto_shash_blocksize(child_shash);
ds = crypto_shash_digestsize(child_shash);
BUG_ON(ds > N2_HASH_KEY_MAX);
if (keylen > bs) {
err = crypto_shash_digest(&desc.shash, key, keylen,
ctx->hash_key);
if (err)
return err;
keylen = ds;
} else if (keylen <= N2_HASH_KEY_MAX)
memcpy(ctx->hash_key, key, keylen);
ctx->hash_key_len = keylen;
return err;
}
static unsigned long wait_for_tail(struct spu_queue *qp)
{
unsigned long head, hv_ret;
@ -393,7 +508,8 @@ static unsigned long submit_and_wait_for_tail(struct spu_queue *qp,
static int n2_do_async_digest(struct ahash_request *req,
unsigned int auth_type, unsigned int digest_size,
unsigned int result_size, void *hash_loc)
unsigned int result_size, void *hash_loc,
unsigned long auth_key, unsigned int auth_key_len)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct cwq_initial_entry *ent;
@ -434,13 +550,13 @@ static int n2_do_async_digest(struct ahash_request *req,
*/
ent = qp->q + qp->tail;
ent->control = control_word_base(nbytes, 0, 0,
ent->control = control_word_base(nbytes, auth_key_len, 0,
auth_type, digest_size,
false, true, false, false,
OPCODE_INPLACE_BIT |
OPCODE_AUTH_MAC);
ent->src_addr = __pa(walk.data);
ent->auth_key_addr = 0UL;
ent->auth_key_addr = auth_key;
ent->auth_iv_addr = __pa(hash_loc);
ent->final_auth_state_addr = 0UL;
ent->enc_key_addr = 0UL;
@ -494,7 +610,40 @@ static int n2_hash_async_digest(struct ahash_request *req)
return n2_do_async_digest(req, n2alg->auth_type,
n2alg->hw_op_hashsz, ds,
&rctx->u);
&rctx->u, 0UL, 0);
}
static int n2_hmac_async_digest(struct ahash_request *req)
{
struct n2_hmac_alg *n2alg = n2_hmac_alg(req->base.tfm);
struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct n2_hmac_ctx *ctx = crypto_ahash_ctx(tfm);
int ds;
ds = n2alg->derived.digest_size;
if (unlikely(req->nbytes == 0) ||
unlikely(ctx->hash_key_len > N2_HASH_KEY_MAX)) {
struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
struct n2_hash_ctx *ctx = crypto_ahash_ctx(tfm);
ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
rctx->fallback_req.base.flags =
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
rctx->fallback_req.nbytes = req->nbytes;
rctx->fallback_req.src = req->src;
rctx->fallback_req.result = req->result;
return crypto_ahash_digest(&rctx->fallback_req);
}
memcpy(&rctx->u, n2alg->derived.hash_init,
n2alg->derived.hw_op_hashsz);
return n2_do_async_digest(req, n2alg->derived.hmac_type,
n2alg->derived.hw_op_hashsz, ds,
&rctx->u,
__pa(&ctx->hash_key),
ctx->hash_key_len);
}
struct n2_cipher_context {
@ -1127,6 +1276,7 @@ struct n2_hash_tmpl {
u8 digest_size;
u8 block_size;
u8 auth_type;
u8 hmac_type;
};
static const char md5_zero[MD5_DIGEST_SIZE] = {
@ -1173,6 +1323,7 @@ static const struct n2_hash_tmpl hash_tmpls[] = {
.hash_zero = md5_zero,
.hash_init = md5_init,
.auth_type = AUTH_TYPE_MD5,
.hmac_type = AUTH_TYPE_HMAC_MD5,
.hw_op_hashsz = MD5_DIGEST_SIZE,
.digest_size = MD5_DIGEST_SIZE,
.block_size = MD5_HMAC_BLOCK_SIZE },
@ -1180,6 +1331,7 @@ static const struct n2_hash_tmpl hash_tmpls[] = {
.hash_zero = sha1_zero,
.hash_init = sha1_init,
.auth_type = AUTH_TYPE_SHA1,
.hmac_type = AUTH_TYPE_HMAC_SHA1,
.hw_op_hashsz = SHA1_DIGEST_SIZE,
.digest_size = SHA1_DIGEST_SIZE,
.block_size = SHA1_BLOCK_SIZE },
@ -1187,6 +1339,7 @@ static const struct n2_hash_tmpl hash_tmpls[] = {
.hash_zero = sha256_zero,
.hash_init = sha256_init,
.auth_type = AUTH_TYPE_SHA256,
.hmac_type = AUTH_TYPE_HMAC_SHA256,
.hw_op_hashsz = SHA256_DIGEST_SIZE,
.digest_size = SHA256_DIGEST_SIZE,
.block_size = SHA256_BLOCK_SIZE },
@ -1194,6 +1347,7 @@ static const struct n2_hash_tmpl hash_tmpls[] = {
.hash_zero = sha224_zero,
.hash_init = sha224_init,
.auth_type = AUTH_TYPE_SHA256,
.hmac_type = AUTH_TYPE_RESERVED,
.hw_op_hashsz = SHA256_DIGEST_SIZE,
.digest_size = SHA224_DIGEST_SIZE,
.block_size = SHA224_BLOCK_SIZE },
@ -1201,6 +1355,7 @@ static const struct n2_hash_tmpl hash_tmpls[] = {
#define NUM_HASH_TMPLS ARRAY_SIZE(hash_tmpls)
static LIST_HEAD(ahash_algs);
static LIST_HEAD(hmac_algs);
static int algs_registered;
@ -1208,12 +1363,18 @@ static void __n2_unregister_algs(void)
{
struct n2_cipher_alg *cipher, *cipher_tmp;
struct n2_ahash_alg *alg, *alg_tmp;
struct n2_hmac_alg *hmac, *hmac_tmp;
list_for_each_entry_safe(cipher, cipher_tmp, &cipher_algs, entry) {
crypto_unregister_alg(&cipher->alg);
list_del(&cipher->entry);
kfree(cipher);
}
list_for_each_entry_safe(hmac, hmac_tmp, &hmac_algs, derived.entry) {
crypto_unregister_ahash(&hmac->derived.alg);
list_del(&hmac->derived.entry);
kfree(hmac);
}
list_for_each_entry_safe(alg, alg_tmp, &ahash_algs, entry) {
crypto_unregister_ahash(&alg->alg);
list_del(&alg->entry);
@ -1262,6 +1423,44 @@ static int __devinit __n2_register_one_cipher(const struct n2_cipher_tmpl *tmpl)
return err;
}
static int __devinit __n2_register_one_hmac(struct n2_ahash_alg *n2ahash)
{
struct n2_hmac_alg *p = kzalloc(sizeof(*p), GFP_KERNEL);
struct ahash_alg *ahash;
struct crypto_alg *base;
int err;
if (!p)
return -ENOMEM;
p->child_alg = n2ahash->alg.halg.base.cra_name;
memcpy(&p->derived, n2ahash, sizeof(struct n2_ahash_alg));
INIT_LIST_HEAD(&p->derived.entry);
ahash = &p->derived.alg;
ahash->digest = n2_hmac_async_digest;
ahash->setkey = n2_hmac_async_setkey;
base = &ahash->halg.base;
snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", p->child_alg);
snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s-n2", p->child_alg);
base->cra_ctxsize = sizeof(struct n2_hmac_ctx);
base->cra_init = n2_hmac_cra_init;
base->cra_exit = n2_hmac_cra_exit;
list_add(&p->derived.entry, &hmac_algs);
err = crypto_register_ahash(ahash);
if (err) {
pr_err("%s alg registration failed\n", base->cra_name);
list_del(&p->derived.entry);
kfree(p);
} else {
pr_info("%s alg registered\n", base->cra_name);
}
return err;
}
static int __devinit __n2_register_one_ahash(const struct n2_hash_tmpl *tmpl)
{
struct n2_ahash_alg *p = kzalloc(sizeof(*p), GFP_KERNEL);
@ -1276,6 +1475,7 @@ static int __devinit __n2_register_one_ahash(const struct n2_hash_tmpl *tmpl)
p->hash_zero = tmpl->hash_zero;
p->hash_init = tmpl->hash_init;
p->auth_type = tmpl->auth_type;
p->hmac_type = tmpl->hmac_type;
p->hw_op_hashsz = tmpl->hw_op_hashsz;
p->digest_size = tmpl->digest_size;
@ -1309,6 +1509,8 @@ static int __devinit __n2_register_one_ahash(const struct n2_hash_tmpl *tmpl)
} else {
pr_info("%s alg registered\n", base->cra_name);
}
if (!err && p->hmac_type != AUTH_TYPE_RESERVED)
err = __n2_register_one_hmac(p);
return err;
}