crypto: hmac - Switch to shash
This patch changes hmac to the new shash interface.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
crypto/hmac.c | 271 ++++++++++++++++++++++++----------------------------------
1 file changed, 114 insertions(+), 157 deletions(-)
diff --git a/crypto/hmac.c b/crypto/hmac.c
index 0ad39c3..e373427 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -27,7 +27,7 @@
#include <linux/string.h>
struct hmac_ctx {
- struct crypto_hash *child;
+ struct shash_desc *desc;
};
static inline void *align_ptr(void *p, unsigned int align)
@@ -35,57 +35,33 @@ static inline void *align_ptr(void *p, unsigned int align)
return (void *)ALIGN((unsigned long)p, align);
}
-static inline struct hmac_ctx *hmac_ctx(struct crypto_hash *tfm)
+static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm)
{
- return align_ptr(crypto_hash_ctx_aligned(tfm) +
- crypto_hash_blocksize(tfm) * 2 +
- crypto_hash_digestsize(tfm), sizeof(void *));
+ return align_ptr(crypto_shash_ctx_aligned(tfm) +
+ crypto_shash_blocksize(tfm) * 2 +
+ crypto_shash_digestsize(tfm),
+ crypto_tfm_ctx_alignment());
}
-static int hmac_setkey(struct crypto_hash *parent,
+static int hmac_setkey(struct crypto_shash *parent,
const u8 *inkey, unsigned int keylen)
{
- int bs = crypto_hash_blocksize(parent);
- int ds = crypto_hash_digestsize(parent);
- char *ipad = crypto_hash_ctx_aligned(parent);
+ int bs = crypto_shash_blocksize(parent);
+ int ds = crypto_shash_digestsize(parent);
+ char *ipad = crypto_shash_ctx_aligned(parent);
char *opad = ipad + bs;
char *digest = opad + bs;
- struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *));
- struct crypto_hash *tfm = ctx->child;
+ struct hmac_ctx *ctx = align_ptr(digest + ds,
+ crypto_tfm_ctx_alignment());
unsigned int i;
if (keylen > bs) {
- struct hash_desc desc;
- struct scatterlist tmp;
- int tmplen;
int err;
- desc.tfm = tfm;
- desc.flags = crypto_hash_get_flags(parent);
- desc.flags &= CRYPTO_TFM_REQ_MAY_SLEEP;
+ ctx->desc->flags = crypto_shash_get_flags(parent) &
+ CRYPTO_TFM_REQ_MAY_SLEEP;
- err = crypto_hash_init(&desc);
- if (err)
- return err;
-
- tmplen = bs * 2 + ds;
- sg_init_one(&tmp, ipad, tmplen);
-
- for (; keylen > tmplen; inkey += tmplen, keylen -= tmplen) {
- memcpy(ipad, inkey, tmplen);
- err = crypto_hash_update(&desc, &tmp, tmplen);
- if (err)
- return err;
- }
-
- if (keylen) {
- memcpy(ipad, inkey, keylen);
- err = crypto_hash_update(&desc, &tmp, keylen);
- if (err)
- return err;
- }
-
- err = crypto_hash_final(&desc, digest);
+ err = crypto_shash_digest(ctx->desc, inkey, keylen, digest);
if (err)
return err;
@@ -105,181 +81,162 @@ static int hmac_setkey(struct crypto_hash *parent,
return 0;
}
-static int hmac_init(struct hash_desc *pdesc)
+static int hmac_init(struct shash_desc *pdesc)
{
- struct crypto_hash *parent = pdesc->tfm;
- int bs = crypto_hash_blocksize(parent);
- int ds = crypto_hash_digestsize(parent);
- char *ipad = crypto_hash_ctx_aligned(parent);
- struct hmac_ctx *ctx = align_ptr(ipad + bs * 2 + ds, sizeof(void *));
- struct hash_desc desc;
- struct scatterlist tmp;
- int err;
-
- desc.tfm = ctx->child;
- desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
- sg_init_one(&tmp, ipad, bs);
-
- err = crypto_hash_init(&desc);
- if (unlikely(err))
- return err;
-
- return crypto_hash_update(&desc, &tmp, bs);
+ struct crypto_shash *parent = pdesc->tfm;
+ int bs = crypto_shash_blocksize(parent);
+ int ds = crypto_shash_digestsize(parent);
+ char *ipad = crypto_shash_ctx_aligned(parent);
+ struct hmac_ctx *ctx = align_ptr(ipad + bs * 2 + ds,
+ crypto_tfm_ctx_alignment());
+ struct shash_desc *desc = shash_desc_ctx(pdesc);
+
+ desc->tfm = ctx->desc->tfm;
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ return crypto_shash_init(desc) ?:
+ crypto_shash_update(desc, ipad, bs);
}
-static int hmac_update(struct hash_desc *pdesc,
- struct scatterlist *sg, unsigned int nbytes)
+static int hmac_update(struct shash_desc *pdesc,
+ const u8 *data, unsigned int nbytes)
{
- struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm);
- struct hash_desc desc;
+ struct shash_desc *desc = shash_desc_ctx(pdesc);
- desc.tfm = ctx->child;
- desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
- return crypto_hash_update(&desc, sg, nbytes);
+ return crypto_shash_update(desc, data, nbytes);
}
-static int hmac_final(struct hash_desc *pdesc, u8 *out)
+static int hmac_final(struct shash_desc *pdesc, u8 *out)
{
- struct crypto_hash *parent = pdesc->tfm;
- int bs = crypto_hash_blocksize(parent);
- int ds = crypto_hash_digestsize(parent);
- char *opad = crypto_hash_ctx_aligned(parent) + bs;
+ struct crypto_shash *parent = pdesc->tfm;
+ int bs = crypto_shash_blocksize(parent);
+ int ds = crypto_shash_digestsize(parent);
+ char *opad = crypto_shash_ctx_aligned(parent) + bs;
char *digest = opad + bs;
- struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *));
- struct hash_desc desc;
- struct scatterlist tmp;
- int err;
-
- desc.tfm = ctx->child;
- desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
- sg_init_one(&tmp, opad, bs + ds);
+ struct shash_desc *desc = shash_desc_ctx(pdesc);
- err = crypto_hash_final(&desc, digest);
- if (unlikely(err))
- return err;
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
- return crypto_hash_digest(&desc, &tmp, bs + ds, out);
+ return crypto_shash_final(desc, digest) ?:
+ crypto_shash_digest(desc, opad, bs + ds, out);
}
-static int hmac_digest(struct hash_desc *pdesc, struct scatterlist *sg,
- unsigned int nbytes, u8 *out)
+static int hmac_finup(struct shash_desc *pdesc, const u8 *data,
+ unsigned int nbytes, u8 *out)
{
- struct crypto_hash *parent = pdesc->tfm;
- int bs = crypto_hash_blocksize(parent);
- int ds = crypto_hash_digestsize(parent);
- char *ipad = crypto_hash_ctx_aligned(parent);
- char *opad = ipad + bs;
- char *digest = opad + bs;
- struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *));
- struct hash_desc desc;
- struct scatterlist sg1[2];
- struct scatterlist sg2[1];
- int err;
- desc.tfm = ctx->child;
- desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
-
- sg_init_table(sg1, 2);
- sg_set_buf(sg1, ipad, bs);
- scatterwalk_sg_chain(sg1, 2, sg);
+ struct crypto_shash *parent = pdesc->tfm;
+ int bs = crypto_shash_blocksize(parent);
+ int ds = crypto_shash_digestsize(parent);
+ char *opad = crypto_shash_ctx_aligned(parent) + bs;
+ char *digest = opad + bs;
+ struct shash_desc *desc = shash_desc_ctx(pdesc);
- sg_init_table(sg2, 1);
- sg_set_buf(sg2, opad, bs + ds);
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
- err = crypto_hash_digest(&desc, sg1, nbytes + bs, digest);
- if (unlikely(err))
- return err;
-
- return crypto_hash_digest(&desc, sg2, bs + ds, out);
+ return crypto_shash_finup(desc, data, nbytes, digest) ?:
+ crypto_shash_digest(desc, opad, bs + ds, out);
}
static int hmac_init_tfm(struct crypto_tfm *tfm)
{
- struct crypto_hash *hash;
+ struct crypto_shash *parent = __crypto_shash_cast(tfm);
+ struct crypto_shash *hash;
struct crypto_instance *inst = (void *)tfm->__crt_alg;
- struct crypto_spawn *spawn = crypto_instance_ctx(inst);
- struct hmac_ctx *ctx = hmac_ctx(__crypto_hash_cast(tfm));
+ struct crypto_shash_spawn *spawn = crypto_instance_ctx(inst);
+ struct hmac_ctx *ctx = hmac_ctx(parent);
- hash = crypto_spawn_hash(spawn);
+ hash = crypto_spawn_shash(spawn);
if (IS_ERR(hash))
return PTR_ERR(hash);
- ctx->child = hash;
+ parent->descsize = sizeof(struct shash_desc) +
+ crypto_shash_descsize(hash);
+
+ ctx->desc = kmalloc(parent->descsize, GFP_KERNEL);
+ if (!ctx->desc) {
+ crypto_free_shash(hash);
+ return -ENOMEM;
+ }
+
+ ctx->desc->tfm = hash;
return 0;
}
static void hmac_exit_tfm(struct crypto_tfm *tfm)
{
- struct hmac_ctx *ctx = hmac_ctx(__crypto_hash_cast(tfm));
- crypto_free_hash(ctx->child);
+ struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm));
+ crypto_free_shash(ctx->desc->tfm);
+ kzfree(ctx->desc);
}
-static void hmac_free(struct crypto_instance *inst)
+static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
{
- crypto_drop_spawn(crypto_instance_ctx(inst));
- kfree(inst);
-}
-
-static struct crypto_instance *hmac_alloc(struct rtattr **tb)
-{
- struct crypto_instance *inst;
+ struct shash_instance *inst;
struct crypto_alg *alg;
+ struct shash_alg *salg;
int err;
int ds;
- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_HASH);
+ err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
if (err)
- return ERR_PTR(err);
-
- alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_HASH,
- CRYPTO_ALG_TYPE_HASH_MASK);
- if (IS_ERR(alg))
- return ERR_CAST(alg);
-
- inst = ERR_PTR(-EINVAL);
- ds = alg->cra_type == &crypto_hash_type ?
- alg->cra_hash.digestsize :
- alg->cra_type ?
- __crypto_shash_alg(alg)->digestsize :
- alg->cra_digest.dia_digestsize;
+ return err;
+
+ salg = shash_attr_alg(tb[1], 0, 0);
+ if (IS_ERR(salg))
+ return PTR_ERR(salg);
+
+ err = -EINVAL;
+ ds = salg->digestsize;
+ alg = &salg->base;
if (ds > alg->cra_blocksize)
goto out_put_alg;
- inst = crypto_alloc_instance("hmac", alg);
+ inst = shash_alloc_instance("hmac", alg);
if (IS_ERR(inst))
goto out_put_alg;
- inst->alg.cra_flags = CRYPTO_ALG_TYPE_HASH;
- inst->alg.cra_priority = alg->cra_priority;
- inst->alg.cra_blocksize = alg->cra_blocksize;
- inst->alg.cra_alignmask = alg->cra_alignmask;
- inst->alg.cra_type = &crypto_hash_type;
+ err = crypto_init_shash_spawn(shash_instance_ctx(inst), salg,
+ shash_crypto_instance(inst));
+ if (err)
+ goto out_free_inst;
+
+ inst->alg.base.cra_priority = alg->cra_priority;
+ inst->alg.base.cra_blocksize = alg->cra_blocksize;
+ inst->alg.base.cra_alignmask = alg->cra_alignmask;
- inst->alg.cra_hash.digestsize = ds;
+ inst->alg.digestsize = ds;
- inst->alg.cra_ctxsize = sizeof(struct hmac_ctx) +
- ALIGN(inst->alg.cra_blocksize * 2 + ds,
- sizeof(void *));
+ inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) +
+ ALIGN(alg->cra_blocksize * 2 + ds,
+ crypto_tfm_ctx_alignment());
- inst->alg.cra_init = hmac_init_tfm;
- inst->alg.cra_exit = hmac_exit_tfm;
+ inst->alg.base.cra_init = hmac_init_tfm;
+ inst->alg.base.cra_exit = hmac_exit_tfm;
- inst->alg.cra_hash.init = hmac_init;
- inst->alg.cra_hash.update = hmac_update;
- inst->alg.cra_hash.final = hmac_final;
- inst->alg.cra_hash.digest = hmac_digest;
- inst->alg.cra_hash.setkey = hmac_setkey;
+ inst->alg.init = hmac_init;
+ inst->alg.update = hmac_update;
+ inst->alg.final = hmac_final;
+ inst->alg.finup = hmac_finup;
+ inst->alg.setkey = hmac_setkey;
+
+ err = shash_register_instance(tmpl, inst);
+ if (err) {
+out_free_inst:
+ shash_free_instance(shash_crypto_instance(inst));
+ }
out_put_alg:
crypto_mod_put(alg);
- return inst;
+ return err;
}
static struct crypto_template hmac_tmpl = {
.name = "hmac",
- .alloc = hmac_alloc,
- .free = hmac_free,
+ .create = hmac_create,
+ .free = shash_free_instance,
.module = THIS_MODULE,
};
--
To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
