Commit 5f7082ed authored by Herbert Xu's avatar Herbert Xu

crypto: hash - Export shash through hash

This patch allows shash algorithms to be used through the old hash
interface.  This is a transitional measure so we can convert the
underlying algorithms to shash before converting the users across.
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 67cd080c
......@@ -112,6 +112,22 @@ int crypto_hash_walk_first(struct ahash_request *req,
}
EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
struct crypto_hash_walk *walk,
struct scatterlist *sg, unsigned int len)
{
walk->total = len;
if (!walk->total)
return 0;
walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
walk->sg = sg;
walk->flags = hdesc->flags;
return hash_walk_new_entry(walk);
}
static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen)
{
......
......@@ -11,6 +11,7 @@
*/
#include <crypto/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/authenc.h>
#include <crypto/scatterwalk.h>
......@@ -431,6 +432,8 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
auth->cra_hash.digestsize :
auth->cra_type ?
__crypto_shash_alg(auth)->digestsize :
auth->cra_digest.dia_digestsize;
inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
......
......@@ -16,7 +16,7 @@
*
*/
#include <crypto/algapi.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
......@@ -238,9 +238,11 @@ static struct crypto_instance *hmac_alloc(struct rtattr **tb)
return ERR_CAST(alg);
inst = ERR_PTR(-EINVAL);
ds = (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
CRYPTO_ALG_TYPE_HASH ? alg->cra_hash.digestsize :
alg->cra_digest.dia_digestsize;
ds = alg->cra_type == &crypto_hash_type ?
alg->cra_hash.digestsize :
alg->cra_type ?
__crypto_shash_alg(alg)->digestsize :
alg->cra_digest.dia_digestsize;
if (ds > alg->cra_blocksize)
goto out_put_alg;
......
......@@ -301,9 +301,114 @@ static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
return 0;
}
static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
unsigned int keylen)
{
struct shash_desc *desc = crypto_hash_ctx(tfm);
return crypto_shash_setkey(desc->tfm, key, keylen);
}
static int shash_compat_init(struct hash_desc *hdesc)
{
struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
desc->flags = hdesc->flags;
return crypto_shash_init(desc);
}
static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
unsigned int len)
{
struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
struct crypto_hash_walk walk;
int nbytes;
for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
nbytes = crypto_shash_update(desc, walk.data, nbytes);
return nbytes;
}
static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
{
return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
}
static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
unsigned int nbytes, u8 *out)
{
unsigned int offset = sg->offset;
int err;
if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
void *data;
desc->flags = hdesc->flags;
data = crypto_kmap(sg_page(sg), 0);
err = crypto_shash_digest(desc, data + offset, nbytes, out);
crypto_kunmap(data, 0);
crypto_yield(desc->flags);
goto out;
}
err = shash_compat_init(hdesc);
if (err)
goto out;
err = shash_compat_update(hdesc, sg, nbytes);
if (err)
goto out;
err = shash_compat_final(hdesc, out);
out:
return err;
}
static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
{
struct shash_desc *desc= crypto_tfm_ctx(tfm);
crypto_free_shash(desc->tfm);
}
static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
{
struct hash_tfm *crt = &tfm->crt_hash;
struct crypto_alg *calg = tfm->__crt_alg;
struct shash_alg *alg = __crypto_shash_alg(calg);
struct shash_desc *desc = crypto_tfm_ctx(tfm);
struct crypto_shash *shash;
shash = __crypto_shash_cast(crypto_create_tfm(
calg, &crypto_shash_type));
if (IS_ERR(shash))
return PTR_ERR(shash);
desc->tfm = shash;
tfm->exit = crypto_exit_shash_ops_compat;
crt->init = shash_compat_init;
crt->update = shash_compat_update;
crt->final = shash_compat_final;
crt->digest = shash_compat_digest;
crt->setkey = shash_compat_setkey;
crt->digestsize = alg->digestsize;
return 0;
}
static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
switch (mask & CRYPTO_ALG_TYPE_MASK) {
case CRYPTO_ALG_TYPE_HASH_MASK:
return crypto_init_shash_ops_compat(tfm);
case CRYPTO_ALG_TYPE_AHASH_MASK:
return crypto_init_shash_ops_async(tfm);
}
......@@ -314,7 +419,11 @@ static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
u32 mask)
{
struct shash_alg *salg = __crypto_shash_alg(alg);
switch (mask & CRYPTO_ALG_TYPE_MASK) {
case CRYPTO_ALG_TYPE_HASH_MASK:
return sizeof(struct shash_desc) + salg->descsize;
case CRYPTO_ALG_TYPE_AHASH_MASK:
return sizeof(struct crypto_shash *);
}
......
......@@ -248,6 +248,11 @@ static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
}
static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
{
return crypto_tfm_ctx(&tfm->base);
}
static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
{
return crypto_tfm_ctx_aligned(&tfm->base);
......
......@@ -39,6 +39,9 @@ extern const struct crypto_type crypto_ahash_type;
int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err);
int crypto_hash_walk_first(struct ahash_request *req,
struct crypto_hash_walk *walk);
int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
struct crypto_hash_walk *walk,
struct scatterlist *sg, unsigned int len);
int crypto_register_shash(struct shash_alg *alg);
int crypto_unregister_shash(struct shash_alg *alg);
......
......@@ -36,9 +36,9 @@
#define CRYPTO_ALG_TYPE_ABLKCIPHER 0x00000005
#define CRYPTO_ALG_TYPE_GIVCIPHER 0x00000006
#define CRYPTO_ALG_TYPE_DIGEST 0x00000008
#define CRYPTO_ALG_TYPE_HASH 0x00000009
#define CRYPTO_ALG_TYPE_HASH 0x00000008
#define CRYPTO_ALG_TYPE_SHASH 0x00000009
#define CRYPTO_ALG_TYPE_AHASH 0x0000000a
#define CRYPTO_ALG_TYPE_SHASH 0x0000000b
#define CRYPTO_ALG_TYPE_RNG 0x0000000c
#define CRYPTO_ALG_TYPE_HASH_MASK 0x0000000e
......
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