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-rw-r--r--crypto/Kconfig8
-rw-r--r--crypto/Makefile1
-rw-r--r--crypto/api.c10
-rw-r--r--crypto/cryptomgr.c146
-rw-r--r--include/linux/crypto.h9
5 files changed, 173 insertions, 1 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index aabc631..4ce509d 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -16,6 +16,14 @@ config CRYPTO_ALGAPI
help
This option provides the API for cryptographic algorithms.
+config CRYPTO_MANAGER
+ tristate "Cryptographic algorithm manager"
+ select CRYPTO_ALGAPI
+ default m
+ help
+ Create default cryptographic template instantiations such as
+ cbc(aes).
+
config CRYPTO_HMAC
bool "HMAC support"
help
diff --git a/crypto/Makefile b/crypto/Makefile
index 6d51f80..b8745f3 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -8,6 +8,7 @@ crypto_algapi-$(CONFIG_PROC_FS) += proc.o
crypto_algapi-objs := algapi.o $(crypto_algapi-y)
obj-$(CONFIG_CRYPTO_ALGAPI) += crypto_algapi.o
+obj-$(CONFIG_CRYPTO_MANAGER) += cryptomgr.o
obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
obj-$(CONFIG_CRYPTO_NULL) += crypto_null.o
obj-$(CONFIG_CRYPTO_MD4) += md4.o
diff --git a/crypto/api.c b/crypto/api.c
index 5a0d6a1..67cd6f8 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -18,6 +18,7 @@
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
+#include <linux/module.h>
#include <linux/param.h>
#include <linux/slab.h>
#include <linux/string.h>
@@ -170,6 +171,7 @@ static struct crypto_alg *crypto_alg_mod_lookup(const char *name)
{
struct crypto_alg *alg;
struct crypto_alg *larval;
+ int ok;
alg = try_then_request_module(crypto_alg_lookup(name), name);
if (alg)
@@ -179,7 +181,13 @@ static struct crypto_alg *crypto_alg_mod_lookup(const char *name)
if (!larval || !crypto_is_larval(larval))
return larval;
- if (crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval) == NOTIFY_STOP)
+ ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval);
+ if (ok == NOTIFY_DONE) {
+ request_module("cryptomgr");
+ ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval);
+ }
+
+ if (ok == NOTIFY_STOP)
alg = crypto_larval_wait(larval);
else {
crypto_mod_put(larval);
diff --git a/crypto/cryptomgr.c b/crypto/cryptomgr.c
new file mode 100644
index 0000000..e0ebe1b
--- /dev/null
+++ b/crypto/cryptomgr.c
@@ -0,0 +1,146 @@
+/*
+ * Create default crypto algorithm instances.
+ *
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * 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)
+ * any later version.
+ *
+ */
+
+#include <linux/crypto.h>
+#include <linux/ctype.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/rtnetlink.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
+
+#include "internal.h"
+
+struct cryptomgr_param {
+ struct work_struct work;
+
+ struct {
+ struct rtattr attr;
+ struct crypto_attr_alg data;
+ } alg;
+
+ struct {
+ char name[CRYPTO_MAX_ALG_NAME];
+ } larval;
+
+ char template[CRYPTO_MAX_ALG_NAME];
+};
+
+static void cryptomgr_probe(void *data)
+{
+ struct cryptomgr_param *param = data;
+ struct crypto_template *tmpl;
+ struct crypto_instance *inst;
+
+ tmpl = crypto_lookup_template(param->template);
+ if (!tmpl)
+ goto err;
+
+ inst = tmpl->alloc(&param->alg, sizeof(param->alg));
+ if (IS_ERR(inst))
+ goto err;
+ else if ((err = crypto_register_instance(tmpl, inst))) {
+ tmpl->free(inst);
+ goto err;
+ }
+
+ crypto_tmpl_put(tmpl);
+
+out:
+ kfree(param);
+ return;
+
+err:
+ crypto_larval_error(param->larval.name);
+ goto out;
+}
+
+static int cryptomgr_schedule_probe(struct crypto_larval *larval)
+{
+ struct cryptomgr_param *param;
+ const char *name = larval->alg.cra_name;
+ const char *p;
+ unsigned int len;
+
+ param = kmalloc(sizeof(*param), GFP_KERNEL);
+ if (!param)
+ goto err;
+
+ for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
+ ;
+
+ len = p - name;
+ if (!len || *p != '(')
+ goto err_free_param;
+
+ memcpy(param->template, name, len);
+ param->template[len] = 0;
+
+ name = p + 1;
+ for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
+ ;
+
+ len = p - name;
+ if (!len || *p != ')' || p[1])
+ goto err_free_param;
+
+ param->alg.attr.rta_len = sizeof(param->alg);
+ param->alg.attr.rta_type = CRYPTOA_ALG;
+ memcpy(param->alg.data.name, name, len);
+ param->alg.data.name[len] = 0;
+
+ memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
+
+ INIT_WORK(&param->work, cryptomgr_probe, param);
+ schedule_work(&param->work);
+
+ return NOTIFY_STOP;
+
+err_free_param:
+ kfree(param);
+err:
+ return NOTIFY_OK;
+}
+
+static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
+ void *data)
+{
+ switch (msg) {
+ case CRYPTO_MSG_ALG_REQUEST:
+ return cryptomgr_schedule_probe(data);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block cryptomgr_notifier = {
+ .notifier_call = cryptomgr_notify,
+};
+
+static int __init cryptomgr_init(void)
+{
+ return crypto_register_notifier(&cryptomgr_notifier);
+}
+
+static void __exit cryptomgr_exit(void)
+{
+ int err = crypto_unregister_notifier(&cryptomgr_notifier);
+ BUG_ON(err);
+}
+
+module_init(cryptomgr_init);
+module_exit(cryptomgr_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Crypto Algorithm Manager");
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 3e3e95a..85f73c3 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -260,6 +260,15 @@ struct crypto_tfm {
void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
};
+enum {
+ CRYPTOA_UNSPEC,
+ CRYPTOA_ALG,
+};
+
+struct crypto_attr_alg {
+ char name[CRYPTO_MAX_ALG_NAME];
+};
+
/*
* Transform user interface.
*/
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