*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* Copyright (c) 2002 David S. Miller (davem@redhat.com)
+ * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
*
* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
- * and Nettle, by Niels Möller.
+ * and Nettle, by Niels Möller.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
+ * Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
-#include <linux/init.h>
-#include <linux/crypto.h>
+
+#include <linux/err.h>
#include <linux/errno.h>
+#include <linux/kernel.h>
#include <linux/kmod.h>
-#include <linux/rwsem.h>
+#include <linux/module.h>
+#include <linux/param.h>
+#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/string.h>
#include "internal.h"
LIST_HEAD(crypto_alg_list);
+EXPORT_SYMBOL_GPL(crypto_alg_list);
DECLARE_RWSEM(crypto_alg_sem);
+EXPORT_SYMBOL_GPL(crypto_alg_sem);
+
+BLOCKING_NOTIFIER_HEAD(crypto_chain);
+EXPORT_SYMBOL_GPL(crypto_chain);
+
+static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
+{
+ atomic_inc(&alg->cra_refcnt);
+ return alg;
+}
+
+struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
+{
+ return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
+}
+EXPORT_SYMBOL_GPL(crypto_mod_get);
-static inline int crypto_alg_get(struct crypto_alg *alg)
+void crypto_mod_put(struct crypto_alg *alg)
{
- return try_module_get(alg->cra_module);
+ struct module *module = alg->cra_module;
+
+ crypto_alg_put(alg);
+ module_put(module);
}
+EXPORT_SYMBOL_GPL(crypto_mod_put);
-static inline void crypto_alg_put(struct crypto_alg *alg)
+static inline int crypto_is_test_larval(struct crypto_larval *larval)
{
- module_put(alg->cra_module);
+ return larval->alg.cra_driver_name[0];
}
-static struct crypto_alg *crypto_alg_lookup(const char *name)
+static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
+ u32 mask)
{
struct crypto_alg *q, *alg = NULL;
+ int best = -2;
- if (!name)
- return NULL;
-
- down_read(&crypto_alg_sem);
-
list_for_each_entry(q, &crypto_alg_list, cra_list) {
- if (!(strcmp(q->cra_name, name))) {
- if (crypto_alg_get(q))
- alg = q;
+ int exact, fuzzy;
+
+ if (crypto_is_moribund(q))
+ continue;
+
+ if ((q->cra_flags ^ type) & mask)
+ continue;
+
+ if (crypto_is_larval(q) &&
+ !crypto_is_test_larval((struct crypto_larval *)q) &&
+ ((struct crypto_larval *)q)->mask != mask)
+ continue;
+
+ exact = !strcmp(q->cra_driver_name, name);
+ fuzzy = !strcmp(q->cra_name, name);
+ if (!exact && !(fuzzy && q->cra_priority > best))
+ continue;
+
+ if (unlikely(!crypto_mod_get(q)))
+ continue;
+
+ best = q->cra_priority;
+ if (alg)
+ crypto_mod_put(alg);
+ alg = q;
+
+ if (exact)
break;
- }
}
-
+
+ return alg;
+}
+
+static void crypto_larval_destroy(struct crypto_alg *alg)
+{
+ struct crypto_larval *larval = (void *)alg;
+
+ BUG_ON(!crypto_is_larval(alg));
+ if (larval->adult)
+ crypto_mod_put(larval->adult);
+ kfree(larval);
+}
+
+struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
+{
+ struct crypto_larval *larval;
+
+ larval = kzalloc(sizeof(*larval), GFP_KERNEL);
+ if (!larval)
+ return ERR_PTR(-ENOMEM);
+
+ larval->mask = mask;
+ larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
+ larval->alg.cra_priority = -1;
+ larval->alg.cra_destroy = crypto_larval_destroy;
+
+ strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
+ init_completion(&larval->completion);
+
+ return larval;
+}
+EXPORT_SYMBOL_GPL(crypto_larval_alloc);
+
+static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
+ u32 mask)
+{
+ struct crypto_alg *alg;
+ struct crypto_larval *larval;
+
+ larval = crypto_larval_alloc(name, type, mask);
+ if (IS_ERR(larval))
+ return ERR_CAST(larval);
+
+ atomic_set(&larval->alg.cra_refcnt, 2);
+
+ down_write(&crypto_alg_sem);
+ alg = __crypto_alg_lookup(name, type, mask);
+ if (!alg) {
+ alg = &larval->alg;
+ list_add(&alg->cra_list, &crypto_alg_list);
+ }
+ up_write(&crypto_alg_sem);
+
+ if (alg != &larval->alg)
+ kfree(larval);
+
+ return alg;
+}
+
+void crypto_larval_kill(struct crypto_alg *alg)
+{
+ struct crypto_larval *larval = (void *)alg;
+
+ down_write(&crypto_alg_sem);
+ list_del(&alg->cra_list);
+ up_write(&crypto_alg_sem);
+ complete_all(&larval->completion);
+ crypto_alg_put(alg);
+}
+EXPORT_SYMBOL_GPL(crypto_larval_kill);
+
+static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
+{
+ struct crypto_larval *larval = (void *)alg;
+ long timeout;
+
+ timeout = wait_for_completion_interruptible_timeout(
+ &larval->completion, 60 * HZ);
+
+ alg = larval->adult;
+ if (timeout < 0)
+ alg = ERR_PTR(-EINTR);
+ else if (!timeout)
+ alg = ERR_PTR(-ETIMEDOUT);
+ else if (!alg)
+ alg = ERR_PTR(-ENOENT);
+ else if (crypto_is_test_larval(larval) &&
+ !(alg->cra_flags & CRYPTO_ALG_TESTED))
+ alg = ERR_PTR(-EAGAIN);
+ else if (!crypto_mod_get(alg))
+ alg = ERR_PTR(-EAGAIN);
+ crypto_mod_put(&larval->alg);
+
+ return alg;
+}
+
+struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask)
+{
+ struct crypto_alg *alg;
+
+ down_read(&crypto_alg_sem);
+ alg = __crypto_alg_lookup(name, type, mask);
up_read(&crypto_alg_sem);
+
return alg;
}
+EXPORT_SYMBOL_GPL(crypto_alg_lookup);
-/* A far more intelligent version of this is planned. For now, just
- * try an exact match on the name of the algorithm. */
-static inline struct crypto_alg *crypto_alg_mod_lookup(const char *name)
+struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask)
{
- return try_then_request_module(crypto_alg_lookup(name), name);
+ struct crypto_alg *alg;
+
+ if (!name)
+ return ERR_PTR(-ENOENT);
+
+ mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
+ type &= mask;
+
+ alg = crypto_alg_lookup(name, type, mask);
+ if (!alg) {
+ request_module("%s", name);
+
+ if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
+ CRYPTO_ALG_NEED_FALLBACK))
+ request_module("%s-all", name);
+
+ alg = crypto_alg_lookup(name, type, mask);
+ }
+
+ if (alg)
+ return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
+
+ return crypto_larval_add(name, type, mask);
}
+EXPORT_SYMBOL_GPL(crypto_larval_lookup);
-static int crypto_init_flags(struct crypto_tfm *tfm, u32 flags)
+int crypto_probing_notify(unsigned long val, void *v)
{
- tfm->crt_flags = 0;
-
- switch (crypto_tfm_alg_type(tfm)) {
- case CRYPTO_ALG_TYPE_CIPHER:
- return crypto_init_cipher_flags(tfm, flags);
-
- case CRYPTO_ALG_TYPE_DIGEST:
- return crypto_init_digest_flags(tfm, flags);
-
- case CRYPTO_ALG_TYPE_COMPRESS:
- return crypto_init_compress_flags(tfm, flags);
-
- default:
- break;
+ int ok;
+
+ ok = blocking_notifier_call_chain(&crypto_chain, val, v);
+ if (ok == NOTIFY_DONE) {
+ request_module("cryptomgr");
+ ok = blocking_notifier_call_chain(&crypto_chain, val, v);
}
-
- BUG();
- return -EINVAL;
+
+ return ok;
+}
+EXPORT_SYMBOL_GPL(crypto_probing_notify);
+
+struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
+{
+ struct crypto_alg *alg;
+ struct crypto_alg *larval;
+ int ok;
+
+ if (!((type | mask) & CRYPTO_ALG_TESTED)) {
+ type |= CRYPTO_ALG_TESTED;
+ mask |= CRYPTO_ALG_TESTED;
+ }
+
+ larval = crypto_larval_lookup(name, type, mask);
+ if (IS_ERR(larval) || !crypto_is_larval(larval))
+ return larval;
+
+ ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
+
+ if (ok == NOTIFY_STOP)
+ alg = crypto_larval_wait(larval);
+ else {
+ crypto_mod_put(larval);
+ alg = ERR_PTR(-ENOENT);
+ }
+ crypto_larval_kill(larval);
+ return alg;
}
+EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
-static int crypto_init_ops(struct crypto_tfm *tfm)
+static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
+ const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
+
+ if (type_obj)
+ return type_obj->init(tfm, type, mask);
+
switch (crypto_tfm_alg_type(tfm)) {
case CRYPTO_ALG_TYPE_CIPHER:
return crypto_init_cipher_ops(tfm);
-
- case CRYPTO_ALG_TYPE_DIGEST:
- return crypto_init_digest_ops(tfm);
-
+
case CRYPTO_ALG_TYPE_COMPRESS:
return crypto_init_compress_ops(tfm);
-
+
default:
break;
}
-
+
BUG();
return -EINVAL;
}
static void crypto_exit_ops(struct crypto_tfm *tfm)
{
+ const struct crypto_type *type = tfm->__crt_alg->cra_type;
+
+ if (type) {
+ if (tfm->exit)
+ tfm->exit(tfm);
+ return;
+ }
+
switch (crypto_tfm_alg_type(tfm)) {
case CRYPTO_ALG_TYPE_CIPHER:
crypto_exit_cipher_ops(tfm);
break;
-
- case CRYPTO_ALG_TYPE_DIGEST:
- crypto_exit_digest_ops(tfm);
- break;
-
+
case CRYPTO_ALG_TYPE_COMPRESS:
crypto_exit_compress_ops(tfm);
break;
-
+
default:
BUG();
-
}
}
-struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
+static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
+{
+ const struct crypto_type *type_obj = alg->cra_type;
+ unsigned int len;
+
+ len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
+ if (type_obj)
+ return len + type_obj->ctxsize(alg, type, mask);
+
+ switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
+ default:
+ BUG();
+
+ case CRYPTO_ALG_TYPE_CIPHER:
+ len += crypto_cipher_ctxsize(alg);
+ break;
+
+ case CRYPTO_ALG_TYPE_COMPRESS:
+ len += crypto_compress_ctxsize(alg);
+ break;
+ }
+
+ return len;
+}
+
+void crypto_shoot_alg(struct crypto_alg *alg)
+{
+ down_write(&crypto_alg_sem);
+ alg->cra_flags |= CRYPTO_ALG_DYING;
+ up_write(&crypto_alg_sem);
+}
+EXPORT_SYMBOL_GPL(crypto_shoot_alg);
+
+struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
+ u32 mask)
{
struct crypto_tfm *tfm = NULL;
- struct crypto_alg *alg;
+ unsigned int tfm_size;
+ int err = -ENOMEM;
- alg = crypto_alg_mod_lookup(name);
- if (alg == NULL)
- goto out;
-
- tfm = kmalloc(sizeof(*tfm) + alg->cra_ctxsize, GFP_KERNEL);
+ tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
+ tfm = kzalloc(tfm_size, GFP_KERNEL);
if (tfm == NULL)
- goto out_put;
+ goto out_err;
- memset(tfm, 0, sizeof(*tfm) + alg->cra_ctxsize);
-
tfm->__crt_alg = alg;
-
- if (crypto_init_flags(tfm, flags))
- goto out_free_tfm;
-
- if (crypto_init_ops(tfm)) {
- crypto_exit_ops(tfm);
+
+ err = crypto_init_ops(tfm, type, mask);
+ if (err)
goto out_free_tfm;
- }
+
+ if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
+ goto cra_init_failed;
goto out;
+cra_init_failed:
+ crypto_exit_ops(tfm);
out_free_tfm:
+ if (err == -EAGAIN)
+ crypto_shoot_alg(alg);
kfree(tfm);
- tfm = NULL;
-out_put:
- crypto_alg_put(alg);
+out_err:
+ tfm = ERR_PTR(err);
out:
return tfm;
}
+EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
-void crypto_free_tfm(struct crypto_tfm *tfm)
+/*
+ * crypto_alloc_base - Locate algorithm and allocate transform
+ * @alg_name: Name of algorithm
+ * @type: Type of algorithm
+ * @mask: Mask for type comparison
+ *
+ * This function should not be used by new algorithm types.
+ * Plesae use crypto_alloc_tfm instead.
+ *
+ * crypto_alloc_base() will first attempt to locate an already loaded
+ * algorithm. If that fails and the kernel supports dynamically loadable
+ * modules, it will then attempt to load a module of the same name or
+ * alias. If that fails it will send a query to any loaded crypto manager
+ * to construct an algorithm on the fly. A refcount is grabbed on the
+ * algorithm which is then associated with the new transform.
+ *
+ * The returned transform is of a non-determinate type. Most people
+ * should use one of the more specific allocation functions such as
+ * crypto_alloc_blkcipher.
+ *
+ * In case of error the return value is an error pointer.
+ */
+struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
{
- struct crypto_alg *alg = tfm->__crt_alg;
- int size = sizeof(*tfm) + alg->cra_ctxsize;
+ struct crypto_tfm *tfm;
+ int err;
+
+ for (;;) {
+ struct crypto_alg *alg;
+
+ alg = crypto_alg_mod_lookup(alg_name, type, mask);
+ if (IS_ERR(alg)) {
+ err = PTR_ERR(alg);
+ goto err;
+ }
+
+ tfm = __crypto_alloc_tfm(alg, type, mask);
+ if (!IS_ERR(tfm))
+ return tfm;
+
+ crypto_mod_put(alg);
+ err = PTR_ERR(tfm);
+
+err:
+ if (err != -EAGAIN)
+ break;
+ if (signal_pending(current)) {
+ err = -EINTR;
+ break;
+ }
+ }
+
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_base);
+
+void *crypto_create_tfm(struct crypto_alg *alg,
+ const struct crypto_type *frontend)
+{
+ char *mem;
+ struct crypto_tfm *tfm = NULL;
+ unsigned int tfmsize;
+ unsigned int total;
+ int err = -ENOMEM;
+
+ tfmsize = frontend->tfmsize;
+ total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
+
+ mem = kzalloc(total, GFP_KERNEL);
+ if (mem == NULL)
+ goto out_err;
+
+ tfm = (struct crypto_tfm *)(mem + tfmsize);
+ tfm->__crt_alg = alg;
+ err = frontend->init_tfm(tfm);
+ if (err)
+ goto out_free_tfm;
+
+ if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
+ goto cra_init_failed;
+
+ goto out;
+
+cra_init_failed:
crypto_exit_ops(tfm);
- crypto_alg_put(alg);
- memset(tfm, 0, size);
- kfree(tfm);
+out_free_tfm:
+ if (err == -EAGAIN)
+ crypto_shoot_alg(alg);
+ kfree(mem);
+out_err:
+ mem = ERR_PTR(err);
+out:
+ return mem;
}
+EXPORT_SYMBOL_GPL(crypto_create_tfm);
-int crypto_register_alg(struct crypto_alg *alg)
+struct crypto_alg *crypto_find_alg(const char *alg_name,
+ const struct crypto_type *frontend,
+ u32 type, u32 mask)
{
- int ret = 0;
- struct crypto_alg *q;
+ struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) =
+ crypto_alg_mod_lookup;
- if (alg->cra_alignmask & (alg->cra_alignmask + 1))
- return -EINVAL;
+ if (frontend) {
+ type &= frontend->maskclear;
+ mask &= frontend->maskclear;
+ type |= frontend->type;
+ mask |= frontend->maskset;
- if (alg->cra_alignmask > PAGE_SIZE)
- return -EINVAL;
-
- down_write(&crypto_alg_sem);
-
- list_for_each_entry(q, &crypto_alg_list, cra_list) {
- if (!(strcmp(q->cra_name, alg->cra_name))) {
- ret = -EEXIST;
- goto out;
- }
+ if (frontend->lookup)
+ lookup = frontend->lookup;
}
-
- list_add_tail(&alg->cra_list, &crypto_alg_list);
-out:
- up_write(&crypto_alg_sem);
- return ret;
+
+ return lookup(alg_name, type, mask);
}
+EXPORT_SYMBOL_GPL(crypto_find_alg);
-int crypto_unregister_alg(struct crypto_alg *alg)
+/*
+ * crypto_alloc_tfm - Locate algorithm and allocate transform
+ * @alg_name: Name of algorithm
+ * @frontend: Frontend algorithm type
+ * @type: Type of algorithm
+ * @mask: Mask for type comparison
+ *
+ * crypto_alloc_tfm() will first attempt to locate an already loaded
+ * algorithm. If that fails and the kernel supports dynamically loadable
+ * modules, it will then attempt to load a module of the same name or
+ * alias. If that fails it will send a query to any loaded crypto manager
+ * to construct an algorithm on the fly. A refcount is grabbed on the
+ * algorithm which is then associated with the new transform.
+ *
+ * The returned transform is of a non-determinate type. Most people
+ * should use one of the more specific allocation functions such as
+ * crypto_alloc_blkcipher.
+ *
+ * In case of error the return value is an error pointer.
+ */
+void *crypto_alloc_tfm(const char *alg_name,
+ const struct crypto_type *frontend, u32 type, u32 mask)
{
- int ret = -ENOENT;
- struct crypto_alg *q;
-
- BUG_ON(!alg->cra_module);
-
- down_write(&crypto_alg_sem);
- list_for_each_entry(q, &crypto_alg_list, cra_list) {
- if (alg == q) {
- list_del(&alg->cra_list);
- ret = 0;
- goto out;
+ void *tfm;
+ int err;
+
+ for (;;) {
+ struct crypto_alg *alg;
+
+ alg = crypto_find_alg(alg_name, frontend, type, mask);
+ if (IS_ERR(alg)) {
+ err = PTR_ERR(alg);
+ goto err;
+ }
+
+ tfm = crypto_create_tfm(alg, frontend);
+ if (!IS_ERR(tfm))
+ return tfm;
+
+ crypto_mod_put(alg);
+ err = PTR_ERR(tfm);
+
+err:
+ if (err != -EAGAIN)
+ break;
+ if (signal_pending(current)) {
+ err = -EINTR;
+ break;
}
}
-out:
- up_write(&crypto_alg_sem);
- return ret;
+
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
+
+/*
+ * crypto_destroy_tfm - Free crypto transform
+ * @mem: Start of tfm slab
+ * @tfm: Transform to free
+ *
+ * This function frees up the transform and any associated resources,
+ * then drops the refcount on the associated algorithm.
+ */
+void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
+{
+ struct crypto_alg *alg;
+
+ if (unlikely(!mem))
+ return;
+
+ alg = tfm->__crt_alg;
+
+ if (!tfm->exit && alg->cra_exit)
+ alg->cra_exit(tfm);
+ crypto_exit_ops(tfm);
+ crypto_mod_put(alg);
+ kzfree(mem);
}
+EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
-int crypto_alg_available(const char *name, u32 flags)
+int crypto_has_alg(const char *name, u32 type, u32 mask)
{
int ret = 0;
- struct crypto_alg *alg = crypto_alg_mod_lookup(name);
-
- if (alg) {
- crypto_alg_put(alg);
+ struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
+
+ if (!IS_ERR(alg)) {
+ crypto_mod_put(alg);
ret = 1;
}
-
- return ret;
-}
-static int __init init_crypto(void)
-{
- printk(KERN_INFO "Initializing Cryptographic API\n");
- crypto_init_proc();
- return 0;
+ return ret;
}
+EXPORT_SYMBOL_GPL(crypto_has_alg);
-__initcall(init_crypto);
-
-EXPORT_SYMBOL_GPL(crypto_register_alg);
-EXPORT_SYMBOL_GPL(crypto_unregister_alg);
-EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
-EXPORT_SYMBOL_GPL(crypto_free_tfm);
-EXPORT_SYMBOL_GPL(crypto_alg_available);
+MODULE_DESCRIPTION("Cryptographic core API");
+MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff