This patch allows skcipher algorithms and instances to be created
and registered with the crypto API. They are accessible through
the top-level skcipher interface, along with ablkcipher/blkcipher
algorithms and instances.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
crypto/skcipher.c | 192 +++++++++++++++++++++++++++++++++++--
include/crypto/internal/skcipher.h | 87 ++++++++++++++++
include/crypto/skcipher.h | 97 ++++++++++++++++++
include/linux/crypto.h | 1
4 files changed, 370 insertions(+), 7 deletions(-)
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 69230e9..fa86a55 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -16,7 +16,11 @@
#include <crypto/internal/skcipher.h>
#include <linux/bug.h>
+#include <linux/cryptouser.h>
#include <linux/module.h>
+#include <linux/rtnetlink.h>
+#include <linux/seq_file.h>
+#include <net/netlink.h>
#include "internal.h"
@@ -25,10 +29,11 @@ static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg)
if (alg->cra_type == &crypto_blkcipher_type)
return sizeof(struct crypto_blkcipher *);
- BUG_ON(alg->cra_type != &crypto_ablkcipher_type &&
- alg->cra_type != &crypto_givcipher_type);
+ if (alg->cra_type == &crypto_ablkcipher_type ||
+ alg->cra_type == &crypto_givcipher_type)
+ return sizeof(struct crypto_ablkcipher *);
- return sizeof(struct crypto_ablkcipher *);
+ return crypto_alg_extsize(alg);
}
static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm,
@@ -216,26 +221,117 @@ static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
return 0;
}
+static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
+ struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
+
+ alg->exit(skcipher);
+}
+
static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
{
+ struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
+ struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
+
if (tfm->__crt_alg->cra_type == &crypto_blkcipher_type)
return crypto_init_skcipher_ops_blkcipher(tfm);
- BUG_ON(tfm->__crt_alg->cra_type != &crypto_ablkcipher_type &&
- tfm->__crt_alg->cra_type != &crypto_givcipher_type);
+ if (tfm->__crt_alg->cra_type == &crypto_ablkcipher_type ||
+ tfm->__crt_alg->cra_type == &crypto_givcipher_type)
+ return crypto_init_skcipher_ops_ablkcipher(tfm);
+
+ skcipher->setkey = alg->setkey;
+ skcipher->encrypt = alg->encrypt;
+ skcipher->decrypt = alg->decrypt;
+ skcipher->ivsize = alg->ivsize;
+ skcipher->keysize = alg->max_keysize;
+
+ if (alg->exit)
+ skcipher->base.exit = crypto_skcipher_exit_tfm;
- return crypto_init_skcipher_ops_ablkcipher(tfm);
+ if (alg->init)
+ return alg->init(skcipher);
+
+ return 0;
+}
+
+static void crypto_skcipher_free_instance(struct crypto_instance *inst)
+{
+ struct skcipher_instance *skcipher =
+ container_of(inst, struct skcipher_instance, s.base);
+
+ skcipher->free(skcipher);
+}
+
+static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
+ __attribute__ ((unused));
+static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
+{
+ struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
+ base);
+
+ seq_printf(m, "type : skcipher\n");
+ seq_printf(m, "async : %s\n",
+ alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no");
+ seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
+ seq_printf(m, "min keysize : %u\n", skcipher->min_keysize);
+ seq_printf(m, "max keysize : %u\n", skcipher->max_keysize);
+ seq_printf(m, "ivsize : %u\n", skcipher->ivsize);
}
+#ifdef CONFIG_NET
+static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+ struct crypto_report_blkcipher rblkcipher;
+ struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
+ base);
+
+ strncpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type));
+ strncpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));
+
+ rblkcipher.blocksize = alg->cra_blocksize;
+ rblkcipher.min_keysize = skcipher->min_keysize;
+ rblkcipher.max_keysize = skcipher->max_keysize;
+ rblkcipher.ivsize = skcipher->ivsize;
+
+ if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
+ sizeof(struct crypto_report_blkcipher), &rblkcipher))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+#else
+static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+ return -ENOSYS;
+}
+#endif
+
static const struct crypto_type crypto_skcipher_type2 = {
.extsize = crypto_skcipher_extsize,
.init_tfm = crypto_skcipher_init_tfm,
+ .free = crypto_skcipher_free_instance,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_skcipher_show,
+#endif
+ .report = crypto_skcipher_report,
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
.maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK,
- .type = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .type = CRYPTO_ALG_TYPE_SKCIPHER,
.tfmsize = offsetof(struct crypto_skcipher, base),
};
+int crypto_grab_skcipher2(struct crypto_skcipher_spawn *spawn,
+ const char *name, u32 type, u32 mask)
+{
+ spawn->base.frontend = &crypto_skcipher_type2;
+ return crypto_grab_spawn(&spawn->base, name, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_grab_skcipher2);
+
struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
u32 type, u32 mask)
{
@@ -243,5 +339,87 @@ struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
}
EXPORT_SYMBOL_GPL(crypto_alloc_skcipher);
+int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask)
+{
+ return crypto_type_has_alg(alg_name, &crypto_skcipher_type2,
+ type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_has_skcipher2);
+
+static int skcipher_prepare_alg(struct skcipher_alg *alg)
+{
+ struct crypto_alg *base = &alg->base;
+
+ if (alg->ivsize > PAGE_SIZE / 8)
+ return -EINVAL;
+
+ base->cra_type = &crypto_skcipher_type2;
+ base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+ base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
+
+ return 0;
+}
+
+int crypto_register_skcipher(struct skcipher_alg *alg)
+{
+ struct crypto_alg *base = &alg->base;
+ int err;
+
+ err = skcipher_prepare_alg(alg);
+ if (err)
+ return err;
+
+ return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_skcipher);
+
+void crypto_unregister_skcipher(struct skcipher_alg *alg)
+{
+ crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_skcipher);
+
+int crypto_register_skciphers(struct skcipher_alg *algs, int count)
+{
+ int i, ret;
+
+ for (i = 0; i < count; i++) {
+ ret = crypto_register_skcipher(&algs[i]);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ for (--i; i >= 0; --i)
+ crypto_unregister_skcipher(&algs[i]);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_register_skciphers);
+
+void crypto_unregister_skciphers(struct skcipher_alg *algs, int count)
+{
+ int i;
+
+ for (i = count - 1; i >= 0; --i)
+ crypto_unregister_skcipher(&algs[i]);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_skciphers);
+
+int skcipher_register_instance(struct crypto_template *tmpl,
+ struct skcipher_instance *inst)
+{
+ int err;
+
+ err = skcipher_prepare_alg(&inst->alg);
+ if (err)
+ return err;
+
+ return crypto_register_instance(tmpl, skcipher_crypto_instance(inst));
+}
+EXPORT_SYMBOL_GPL(skcipher_register_instance);
+
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Symmetric key cipher type");
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index 2cf7a61..ce6619c 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -19,12 +19,46 @@
struct rtattr;
+struct skcipher_instance {
+ void (*free)(struct skcipher_instance *inst);
+ union {
+ struct {
+ char head[offsetof(struct skcipher_alg, base)];
+ struct crypto_instance base;
+ } s;
+ struct skcipher_alg alg;
+ };
+};
+
struct crypto_skcipher_spawn {
struct crypto_spawn base;
};
extern const struct crypto_type crypto_givcipher_type;
+static inline struct crypto_instance *skcipher_crypto_instance(
+ struct skcipher_instance *inst)
+{
+ return &inst->s.base;
+}
+
+static inline struct skcipher_instance *skcipher_alg_instance(
+ struct crypto_skcipher *skcipher)
+{
+ return container_of(crypto_skcipher_alg(skcipher),
+ struct skcipher_instance, alg);
+}
+
+static inline void *skcipher_instance_ctx(struct skcipher_instance *inst)
+{
+ return crypto_instance_ctx(skcipher_crypto_instance(inst));
+}
+
+static inline void skcipher_request_complete(struct skcipher_request *req, int err)
+{
+ req->base.complete(&req->base, err);
+}
+
static inline void crypto_set_skcipher_spawn(
struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
{
@@ -33,6 +67,8 @@ static inline void crypto_set_skcipher_spawn(
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
u32 type, u32 mask);
+int crypto_grab_skcipher2(struct crypto_skcipher_spawn *spawn,
+ const char *name, u32 type, u32 mask);
struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask);
@@ -47,6 +83,12 @@ static inline struct crypto_alg *crypto_skcipher_spawn_alg(
return spawn->base.alg;
}
+static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
+ struct crypto_skcipher_spawn *spawn)
+{
+ return container_of(spawn->base.alg, struct skcipher_alg, base);
+}
+
static inline struct crypto_ablkcipher *crypto_spawn_skcipher(
struct crypto_skcipher_spawn *spawn)
{
@@ -55,6 +97,25 @@ static inline struct crypto_ablkcipher *crypto_spawn_skcipher(
crypto_skcipher_mask(0)));
}
+static inline struct crypto_skcipher *crypto_spawn_skcipher2(
+ struct crypto_skcipher_spawn *spawn)
+{
+ return crypto_spawn_tfm2(&spawn->base);
+}
+
+static inline void crypto_skcipher_set_reqsize(
+ struct crypto_skcipher *skcipher, unsigned int reqsize)
+{
+ skcipher->reqsize = reqsize;
+}
+
+int crypto_register_skcipher(struct skcipher_alg *alg);
+void crypto_unregister_skcipher(struct skcipher_alg *alg);
+int crypto_register_skciphers(struct skcipher_alg *algs, int count);
+void crypto_unregister_skciphers(struct skcipher_alg *algs, int count);
+int skcipher_register_instance(struct crypto_template *tmpl,
+ struct skcipher_instance *inst);
+
int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req);
int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req);
const char *crypto_default_geniv(const struct crypto_alg *alg);
@@ -122,5 +183,31 @@ static inline u32 skcipher_request_flags(struct skcipher_request *req)
return req->base.flags;
}
+static inline unsigned int crypto_skcipher_alg_min_keysize(
+ struct skcipher_alg *alg)
+{
+ if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+ CRYPTO_ALG_TYPE_BLKCIPHER)
+ return alg->base.cra_blkcipher.min_keysize;
+
+ if (alg->base.cra_ablkcipher.encrypt)
+ return alg->base.cra_ablkcipher.min_keysize;
+
+ return alg->min_keysize;
+}
+
+static inline unsigned int crypto_skcipher_alg_max_keysize(
+ struct skcipher_alg *alg)
+{
+ if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+ CRYPTO_ALG_TYPE_BLKCIPHER)
+ return alg->base.cra_blkcipher.max_keysize;
+
+ if (alg->base.cra_ablkcipher.encrypt)
+ return alg->base.cra_ablkcipher.max_keysize;
+
+ return alg->max_keysize;
+}
+
#endif /* _CRYPTO_INTERNAL_SKCIPHER_H */
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index 0f987f5..6055ff2 100644
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -65,6 +65,72 @@ struct crypto_skcipher {
struct crypto_tfm base;
};
+/**
+ * struct skcipher_alg - symmetric key cipher definition
+ * @min_keysize: Minimum key size supported by the transformation. This is the
+ * smallest key length supported by this transformation algorithm.
+ * This must be set to one of the pre-defined values as this is
+ * not hardware specific. Possible values for this field can be
+ * found via git grep "_MIN_KEY_SIZE" include/crypto/
+ * @max_keysize: Maximum key size supported by the transformation. This is the
+ * largest key length supported by this transformation algorithm.
+ * This must be set to one of the pre-defined values as this is
+ * not hardware specific. Possible values for this field can be
+ * found via git grep "_MAX_KEY_SIZE" include/crypto/
+ * @setkey: Set key for the transformation. This function is used to either
+ * program a supplied key into the hardware or store the key in the
+ * transformation context for programming it later. Note that this
+ * function does modify the transformation context. This function can
+ * be called multiple times during the existence of the transformation
+ * object, so one must make sure the key is properly reprogrammed into
+ * the hardware. This function is also responsible for checking the key
+ * length for validity. In case a software fallback was put in place in
+ * the @cra_init call, this function might need to use the fallback if
+ * the algorithm doesn't support all of the key sizes.
+ * @encrypt: Encrypt a scatterlist of blocks. This function is used to encrypt
+ * the supplied scatterlist containing the blocks of data. The crypto
+ * API consumer is responsible for aligning the entries of the
+ * scatterlist properly and making sure the chunks are correctly
+ * sized. In case a software fallback was put in place in the
+ * @cra_init call, this function might need to use the fallback if
+ * the algorithm doesn't support all of the key sizes. In case the
+ * key was stored in transformation context, the key might need to be
+ * re-programmed into the hardware in this function. This function
+ * shall not modify the transformation context, as this function may
+ * be called in parallel with the same transformation object.
+ * @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt
+ * and the conditions are exactly the same.
+ * @init: Initialize the cryptographic transformation object. This function
+ * is used to initialize the cryptographic transformation object.
+ * This function is called only once at the instantiation time, right
+ * after the transformation context was allocated. In case the
+ * cryptographic hardware has some special requirements which need to
+ * be handled by software, this function shall check for the precise
+ * requirement of the transformation and put any software fallbacks
+ * in place.
+ * @exit: Deinitialize the cryptographic transformation object. This is a
+ * counterpart to @init, used to remove various changes set in
+ * @init.
+ * @ivsize: IV size applicable for transformation. The consumer must provide an
+ * IV of exactly that size to perform the encrypt or decrypt operation.
+ *
+ * All fields except @ivsize are mandatory and must be filled.
+ */
+struct skcipher_alg {
+ int (*setkey)(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keylen);
+ int (*encrypt)(struct skcipher_request *req);
+ int (*decrypt)(struct skcipher_request *req);
+ int (*init)(struct crypto_skcipher *tfm);
+ void (*exit)(struct crypto_skcipher *tfm);
+
+ unsigned int min_keysize;
+ unsigned int max_keysize;
+ unsigned int ivsize;
+
+ struct crypto_alg base;
+};
+
#define SKCIPHER_REQUEST_ON_STACK(name, tfm) \
char __##name##_desc[sizeof(struct skcipher_request) + \
crypto_skcipher_reqsize(tfm)] CRYPTO_MINALIGN_ATTR; \
@@ -231,12 +297,43 @@ static inline int crypto_has_skcipher(const char *alg_name, u32 type,
crypto_skcipher_mask(mask));
}
+/**
+ * crypto_has_skcipher2() - Search for the availability of an skcipher.
+ * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
+ * skcipher
+ * @type: specifies the type of the skcipher
+ * @mask: specifies the mask for the skcipher
+ *
+ * Return: true when the skcipher is known to the kernel crypto API; false
+ * otherwise
+ */
+int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask);
+
static inline const char *crypto_skcipher_driver_name(
struct crypto_skcipher *tfm)
{
return crypto_tfm_alg_driver_name(crypto_skcipher_tfm(tfm));
}
+static inline struct skcipher_alg *crypto_skcipher_alg(
+ struct crypto_skcipher *tfm)
+{
+ return container_of(crypto_skcipher_tfm(tfm)->__crt_alg,
+ struct skcipher_alg, base);
+}
+
+static inline unsigned int crypto_skcipher_alg_ivsize(struct skcipher_alg *alg)
+{
+ if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+ CRYPTO_ALG_TYPE_BLKCIPHER)
+ return alg->base.cra_blkcipher.ivsize;
+
+ if (alg->base.cra_ablkcipher.encrypt)
+ return alg->base.cra_ablkcipher.ivsize;
+
+ return alg->ivsize;
+}
+
/**
* crypto_skcipher_ivsize() - obtain IV size
* @tfm: cipher handle
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 992cfc2..37a652d 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -47,6 +47,7 @@
#define CRYPTO_ALG_TYPE_AEAD 0x00000003
#define CRYPTO_ALG_TYPE_BLKCIPHER 0x00000004
#define CRYPTO_ALG_TYPE_ABLKCIPHER 0x00000005
+#define CRYPTO_ALG_TYPE_SKCIPHER 0x00000005
#define CRYPTO_ALG_TYPE_GIVCIPHER 0x00000006
#define CRYPTO_ALG_TYPE_KPP 0x00000008
#define CRYPTO_ALG_TYPE_RNG 0x0000000c
--
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