Sophie: kernel-2.6.18-238.el5 src

kernel-2.6.18-238.el5.src.rpm

From: Herbert Xu <herbert.xu@redhat.com>
Date: Mon, 7 Jan 2008 20:56:02 +1100
Subject: [crypto] api: add new top-level crypto_api
Message-id: 20080107095602.GA24258@gondor.apana.org.au
O-Subject: Re: [PATCH 1/32] [CRYPTO] api: Add new top-level crypto_api
Bugzilla: 253051

[CRYPTO] api: Add new top-level crypto_api

This changeset backports the new top-level crypto API structure to 2.6.18.
For ABI compatibility it will coexist with the old top-level API.  Where
names conflict the new API has been renamed as ncrypto instead of crypto.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Acked-by: "David S. Miller" <davem@redhat.com>
Acked-by: James Morris <jmorris@redhat.com>

diff --git a/crypto/Kconfig b/crypto/Kconfig
index b2037ed..1f2ebe0 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -9,6 +9,12 @@ config CRYPTO
 	help
 	  This option provides the core Cryptographic API.
 
+config CRYPTO_API
+	tristate
+	depends on CRYPTO
+	help
+	  This option provides the (backported) core Cryptographic API.
+
 config CRYPTO_HMAC
 	bool "HMAC support"
 	depends on CRYPTO
diff --git a/crypto/Makefile b/crypto/Makefile
index ded7e7b..59c93e8 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -7,6 +7,7 @@ proc-crypto-$(CONFIG_PROC_FS) = proc.o
 obj-$(CONFIG_CRYPTO) += api.o scatterwalk.o cipher.o digest.o compress.o \
 			$(proc-crypto-y)
 
+obj-$(CONFIG_CRYPTO_API) += crypto_api.o
 obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
 obj-$(CONFIG_CRYPTO_NULL) += crypto_null.o
 obj-$(CONFIG_CRYPTO_MD4) += md4.o
diff --git a/crypto/crypto_api.c b/crypto/crypto_api.c
new file mode 100644
index 0000000..a7fd196
--- /dev/null
+++ b/crypto/crypto_api.c
@@ -0,0 +1,403 @@
+/*
+ * Scatterlist Cryptographic API.
+ *
+ * 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.
+ *
+ * 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/err.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/module.h>
+#include <linux/param.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include "ninternal.h"
+
+LIST_HEAD(ncrypto_alg_list);
+EXPORT_SYMBOL_GPL(ncrypto_alg_list);
+DECLARE_RWSEM(ncrypto_alg_sem);
+EXPORT_SYMBOL_GPL(ncrypto_alg_sem);
+
+BLOCKING_NOTIFIER_HEAD(crypto_chain);
+EXPORT_SYMBOL_GPL(crypto_chain);
+
+static inline struct ncrypto_alg *ncrypto_alg_get(struct ncrypto_alg *alg)
+{
+	atomic_inc(&alg->cra_refcnt);
+	return alg;
+}
+
+struct ncrypto_alg *crypto_mod_get(struct ncrypto_alg *alg)
+{
+	return try_module_get(alg->cra_module) ? ncrypto_alg_get(alg) : NULL;
+}
+EXPORT_SYMBOL_GPL(crypto_mod_get);
+
+void crypto_mod_put(struct ncrypto_alg *alg)
+{
+	struct module *module = alg->cra_module;
+
+	ncrypto_alg_put(alg);
+	module_put(module);
+}
+EXPORT_SYMBOL_GPL(crypto_mod_put);
+
+struct ncrypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask)
+{
+	struct ncrypto_alg *q, *alg = NULL;
+	int best = -2;
+
+	list_for_each_entry(q, &ncrypto_alg_list, cra_list) {
+		int exact, fuzzy;
+
+		if (crypto_is_moribund(q))
+			continue;
+
+		if ((q->cra_flags ^ type) & mask)
+			continue;
+
+		if (crypto_is_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;
+}
+EXPORT_SYMBOL_GPL(__crypto_alg_lookup);
+
+static void crypto_larval_destroy(struct ncrypto_alg *alg)
+{
+	struct crypto_larval *larval = (void *)alg;
+
+	BUG_ON(!crypto_is_larval(alg));
+	if (larval->adult)
+		crypto_mod_put(larval->adult);
+	kfree(larval);
+}
+
+static struct ncrypto_alg *crypto_larval_alloc(const char *name, u32 type,
+					       u32 mask)
+{
+	struct ncrypto_alg *alg;
+	struct crypto_larval *larval;
+
+	larval = kzalloc(sizeof(*larval), GFP_KERNEL);
+	if (!larval)
+		return ERR_PTR(-ENOMEM);
+
+	larval->mask = mask;
+	larval->alg.cra_flags = NCRYPTO_ALG_LARVAL | type;
+	larval->alg.cra_priority = -1;
+	larval->alg.cra_destroy = crypto_larval_destroy;
+
+	atomic_set(&larval->alg.cra_refcnt, 2);
+	strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
+	init_completion(&larval->completion);
+
+	down_write(&ncrypto_alg_sem);
+	alg = __crypto_alg_lookup(name, type, mask);
+	if (!alg) {
+		alg = &larval->alg;
+		list_add(&alg->cra_list, &ncrypto_alg_list);
+	}
+	up_write(&ncrypto_alg_sem);
+
+	if (alg != &larval->alg)
+		kfree(larval);
+
+	return alg;
+}
+
+void crypto_larval_kill(struct ncrypto_alg *alg)
+{
+	struct crypto_larval *larval = (void *)alg;
+
+	down_write(&ncrypto_alg_sem);
+	list_del(&alg->cra_list);
+	up_write(&ncrypto_alg_sem);
+	complete_all(&larval->completion);
+	ncrypto_alg_put(alg);
+}
+EXPORT_SYMBOL_GPL(crypto_larval_kill);
+
+static struct ncrypto_alg *crypto_larval_wait(struct ncrypto_alg *alg)
+{
+	struct crypto_larval *larval = (void *)alg;
+
+	wait_for_completion_interruptible_timeout(&larval->completion, 60 * HZ);
+	alg = larval->adult;
+	if (alg) {
+		if (!crypto_mod_get(alg))
+			alg = ERR_PTR(-EAGAIN);
+	} else
+		alg = ERR_PTR(-ENOENT);
+	crypto_mod_put(&larval->alg);
+
+	return alg;
+}
+
+static struct ncrypto_alg *crypto_alg_lookup(const char *name, u32 type,
+					     u32 mask)
+{
+	struct ncrypto_alg *alg;
+
+	down_read(&ncrypto_alg_sem);
+	alg = __crypto_alg_lookup(name, type, mask);
+	up_read(&ncrypto_alg_sem);
+
+	return alg;
+}
+
+struct ncrypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask)
+{
+	struct ncrypto_alg *alg;
+
+	if (!name)
+		return ERR_PTR(-ENOENT);
+
+	mask &= ~(NCRYPTO_ALG_LARVAL | NCRYPTO_ALG_DEAD);
+	type &= mask;
+
+	alg = try_then_request_module(crypto_alg_lookup(name, type, mask),
+				      name);
+	if (alg)
+		return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
+
+	return crypto_larval_alloc(name, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_larval_lookup);
+
+struct ncrypto_alg *ncrypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
+{
+	struct ncrypto_alg *alg;
+	struct ncrypto_alg *larval;
+	int ok;
+
+	larval = crypto_larval_lookup(name, type, mask);
+	if (IS_ERR(larval) || !crypto_is_larval(larval))
+		return larval;
+
+	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);
+		alg = ERR_PTR(-ENOENT);
+	}
+	crypto_larval_kill(larval);
+	return alg;
+}
+EXPORT_SYMBOL_GPL(ncrypto_alg_mod_lookup);
+
+static int crypto_init_ops(struct ncrypto_tfm *tfm, u32 type, u32 mask)
+{
+	return tfm->__crt_alg->cra_type->init(tfm, type, mask);
+}
+
+static void crypto_exit_ops(struct ncrypto_tfm *tfm)
+{
+	const struct crypto_type *type = tfm->__crt_alg->cra_type;
+
+	if (type->exit)
+		type->exit(tfm);
+	return;
+}
+
+static unsigned int crypto_ctxsize(struct ncrypto_alg *alg, u32 type, u32 mask)
+{
+	unsigned int len;
+
+	len = alg->cra_alignmask & ~(ncrypto_tfm_ctx_alignment() - 1);
+	return len + alg->cra_type->ctxsize(alg, type, mask);
+}
+
+void crypto_shoot_alg(struct ncrypto_alg *alg)
+{
+	down_write(&ncrypto_alg_sem);
+	alg->cra_flags |= NCRYPTO_ALG_DYING;
+	up_write(&ncrypto_alg_sem);
+}
+EXPORT_SYMBOL_GPL(crypto_shoot_alg);
+
+struct ncrypto_tfm *__crypto_alloc_tfm(struct ncrypto_alg *alg, u32 type,
+				       u32 mask)
+{
+	struct ncrypto_tfm *tfm = NULL;
+	unsigned int tfm_size;
+	int err = -ENOMEM;
+
+	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
+	tfm = kzalloc(tfm_size, GFP_KERNEL);
+	if (tfm == NULL)
+		goto out_err;
+
+	tfm->__crt_alg = alg;
+
+	err = crypto_init_ops(tfm, type, mask);
+	if (err)
+		goto out_free_tfm;
+
+	if (alg->cra_init && (err = alg->cra_init(tfm))) {
+		if (err == -EAGAIN)
+			crypto_shoot_alg(alg);
+		goto cra_init_failed;
+	}
+
+	goto out;
+
+cra_init_failed:
+	crypto_exit_ops(tfm);
+out_free_tfm:
+	kfree(tfm);
+out_err:
+	tfm = ERR_PTR(err);
+out:
+	return tfm;
+}
+EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
+
+/*
+ *	crypto_alloc_base - Locate algorithm and allocate transform
+ *	@alg_name: Name of algorithm
+ *	@type: Type of algorithm
+ *	@mask: Mask for type comparison
+ *
+ *	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 ncrypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
+{
+	struct ncrypto_tfm *tfm;
+	int err;
+
+	for (;;) {
+		struct ncrypto_alg *alg;
+
+		alg = ncrypto_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);
+ 
+/*
+ *	ncrypto_free_tfm - Free crypto transform
+ *	@tfm: Transform to free
+ *
+ *	ncrypto_free_tfm() frees up the transform and any associated resources,
+ *	then drops the refcount on the associated algorithm.
+ */
+void ncrypto_free_tfm(struct ncrypto_tfm *tfm)
+{
+	struct ncrypto_alg *alg;
+	int size;
+
+	if (unlikely(!tfm))
+		return;
+
+	alg = tfm->__crt_alg;
+	size = sizeof(*tfm) + alg->cra_ctxsize;
+
+	if (alg->cra_exit)
+		alg->cra_exit(tfm);
+	crypto_exit_ops(tfm);
+	crypto_mod_put(alg);
+	memset(tfm, 0, size);
+	kfree(tfm);
+}
+
+EXPORT_SYMBOL_GPL(ncrypto_free_tfm);
+
+int crypto_has_alg(const char *name, u32 type, u32 mask)
+{
+	int ret = 0;
+	struct ncrypto_alg *alg = ncrypto_alg_mod_lookup(name, type, mask);
+	
+	if (!IS_ERR(alg)) {
+		crypto_mod_put(alg);
+		ret = 1;
+	}
+	
+	return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_has_alg);
+
+static int __init crypto_api_init(void)
+{
+	return 0;
+}
+
+static void __exit crypto_api_exit(void)
+{
+}
+
+module_init(crypto_api_init);
+module_exit(crypto_api_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cryptographic API (backported)");
diff --git a/crypto/ninternal.h b/crypto/ninternal.h
new file mode 100644
index 0000000..981ea36
--- /dev/null
+++ b/crypto/ninternal.h
@@ -0,0 +1,80 @@
+/*
+ * Cryptographic API.
+ *
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ * Copyright (c) 2005 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.
+ *
+ */
+#ifndef _CRYPTO_NINTERNAL_H
+#define _CRYPTO_NINTERNAL_H
+
+#include <crypto/algapi.h>
+#include <linux/notifier.h>
+
+#include "internal.h"
+
+/* Crypto notification events. */
+enum {
+	CRYPTO_MSG_ALG_REQUEST,
+	CRYPTO_MSG_ALG_REGISTER,
+	CRYPTO_MSG_ALG_UNREGISTER,
+	CRYPTO_MSG_TMPL_REGISTER,
+	CRYPTO_MSG_TMPL_UNREGISTER,
+};
+
+struct crypto_larval {
+	struct ncrypto_alg alg;
+	struct ncrypto_alg *adult;
+	struct completion completion;
+	u32 mask;
+};
+
+extern struct list_head ncrypto_alg_list;
+extern struct rw_semaphore ncrypto_alg_sem;
+extern struct blocking_notifier_head crypto_chain;
+
+struct ncrypto_alg *crypto_mod_get(struct ncrypto_alg *alg);
+struct ncrypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask);
+struct ncrypto_alg *ncrypto_alg_mod_lookup(const char *name, u32 type,
+					   u32 mask);
+
+void crypto_larval_kill(struct ncrypto_alg *alg);
+struct ncrypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask);
+void crypto_larval_error(const char *name, u32 type, u32 mask);
+
+void crypto_shoot_alg(struct ncrypto_alg *alg);
+struct ncrypto_tfm *__crypto_alloc_tfm(struct ncrypto_alg *alg, u32 type,
+				       u32 mask);
+
+static inline void ncrypto_alg_put(struct ncrypto_alg *alg)
+{
+	if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
+		alg->cra_destroy(alg);
+}
+
+static inline int crypto_is_larval(struct ncrypto_alg *alg)
+{
+	return alg->cra_flags & NCRYPTO_ALG_LARVAL;
+}
+
+static inline int crypto_is_dead(struct ncrypto_alg *alg)
+{
+	return alg->cra_flags & NCRYPTO_ALG_DEAD;
+}
+
+static inline int crypto_is_moribund(struct ncrypto_alg *alg)
+{
+	return alg->cra_flags & (NCRYPTO_ALG_DEAD | NCRYPTO_ALG_DYING);
+}
+
+static inline int crypto_notify(unsigned long val, void *v)
+{
+	return blocking_notifier_call_chain(&crypto_chain, val, v);
+}
+
+#endif	/* _CRYPTO_NINTERNAL_H */
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
new file mode 100644
index 0000000..28c0284
--- /dev/null
+++ b/include/crypto/algapi.h
@@ -0,0 +1,30 @@
+/*
+ * Cryptographic API for algorithms (i.e., low-level API).
+ *
+ * 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.
+ *
+ */
+#ifndef _CRYPTO_ALGAPI_H
+#define _CRYPTO_ALGAPI_H
+
+#include <linux/ncrypto.h>
+#include <linux/kernel.h>
+
+struct seq_file;
+
+struct crypto_type {
+	unsigned int (*ctxsize)(struct ncrypto_alg *alg, u32 type, u32 mask);
+	int (*init)(struct ncrypto_tfm *tfm, u32 type, u32 mask);
+	void (*exit)(struct ncrypto_tfm *tfm);
+	void (*show)(struct seq_file *m, struct ncrypto_alg *alg);
+};
+
+void crypto_mod_put(struct ncrypto_alg *alg);
+
+#endif	/* _CRYPTO_ALGAPI_H */
+
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 3abe2ac..cda3885 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -46,6 +46,7 @@
 
 #define CRYPTO_TFM_REQ_WEAK_KEY		0x00000100
 #define CRYPTO_TFM_REQ_MAY_SLEEP	0x00000200
+#define CRYPTO_TFM_REQ_MAY_BACKLOG	0x00000400
 #define CRYPTO_TFM_RES_WEAK_KEY		0x00100000
 #define CRYPTO_TFM_RES_BAD_KEY_LEN   	0x00200000
 #define CRYPTO_TFM_RES_BAD_KEY_SCHED 	0x00400000
diff --git a/include/linux/ncrypto.h b/include/linux/ncrypto.h
new file mode 100644
index 0000000..fb0b543
--- /dev/null
+++ b/include/linux/ncrypto.h
@@ -0,0 +1,203 @@
+/*
+ * Scatterlist Cryptographic API.
+ *
+ * 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 M�ller.
+ * 
+ * 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.
+ *
+ */
+#ifndef _LINUX_NCRYPTO_H
+#define _LINUX_NCRYPTO_H
+
+#include <asm/atomic.h>
+#include <linux/crypto.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+
+#define NCRYPTO_ALG_TYPE_MASK		0x0000000f
+#define NCRYPTO_ALG_TYPE_CIPHER		0x00000001
+#define NCRYPTO_ALG_TYPE_DIGEST		0x00000002
+#define NCRYPTO_ALG_TYPE_COMPRESS	0x00000008
+
+#define NCRYPTO_ALG_LARVAL		0x00000010
+#define NCRYPTO_ALG_DEAD		0x00000020
+#define NCRYPTO_ALG_DYING		0x00000040
+#define NCRYPTO_ALG_ASYNC		0x00000080
+
+/*
+ * The macro CRYPTO_MINALIGN_ATTR (along with the void * type in the actual
+ * declaration) is used to ensure that the crypto_tfm context structure is
+ * aligned correctly for the given architecture so that there are no alignment
+ * faults for C data types.  In particular, this is required on platforms such
+ * as arm where pointers are 32-bit aligned but there are data types such as
+ * u64 which require 64-bit alignment.
+ */
+#if defined(ARCH_KMALLOC_MINALIGN)
+#define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN
+#elif defined(ARCH_SLAB_MINALIGN)
+#define CRYPTO_MINALIGN ARCH_SLAB_MINALIGN
+#else
+#define CRYPTO_MINALIGN __alignof__(unsigned long long)
+#endif
+
+#ifdef CRYPTO_MINALIGN
+#define CRYPTO_MINALIGN_ATTR __attribute__ ((__aligned__(CRYPTO_MINALIGN)))
+#else
+#define CRYPTO_MINALIGN_ATTR
+#endif
+
+#ifndef PTR_ALIGN
+#define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
+#endif
+#ifndef IS_ALIGNED
+#define IS_ALIGNED(x,a)		(((x) % ((typeof(x))(a))) == 0)
+#endif
+
+struct crypto_async_request;
+struct ncrypto_tfm;
+struct crypto_type;
+struct module;
+
+typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);
+
+struct crypto_async_request {
+	struct list_head list;
+	crypto_completion_t complete;
+	void *data;
+	struct ncrypto_tfm *tfm;
+
+	u32 flags;
+};
+
+struct ncrypto_alg {
+	struct list_head cra_list;
+	struct list_head cra_users;
+
+	u32 cra_flags;
+	unsigned int cra_blocksize;
+	unsigned int cra_ctxsize;
+	unsigned int cra_alignmask;
+
+	int cra_priority;
+	atomic_t cra_refcnt;
+
+	char cra_name[CRYPTO_MAX_ALG_NAME];
+	char cra_driver_name[CRYPTO_MAX_ALG_NAME];
+
+	const struct crypto_type *cra_type;
+
+	union {
+	} cra_u;
+
+	int (*cra_init)(struct ncrypto_tfm *tfm);
+	void (*cra_exit)(struct ncrypto_tfm *tfm);
+	void (*cra_destroy)(struct ncrypto_alg *alg);
+	
+	struct module *cra_module;
+};
+
+/*
+ * Algorithm registration interface.
+ */
+int ncrypto_register_alg(struct ncrypto_alg *alg);
+int ncrypto_unregister_alg(struct ncrypto_alg *alg);
+
+/*
+ * Algorithm query interface.
+ */
+#ifdef CONFIG_CRYPTO
+int crypto_has_alg(const char *name, u32 type, u32 mask);
+#else
+static inline int crypto_has_alg(const char *name, u32 type, u32 mask)
+{
+	return 0;
+}
+#endif
+
+struct ncrypto_tfm {
+
+	u32 crt_flags;
+	
+	union {
+	} crt_u;
+	
+	struct ncrypto_alg *__crt_alg;
+
+	void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
+enum {
+	CRYPTOA_UNSPEC,
+	CRYPTOA_ALG,
+	CRYPTOA_TYPE,
+	CRYPTOA_U32,
+	__CRYPTOA_MAX,
+};
+
+#define CRYPTOA_MAX (__CRYPTOA_MAX - 1)
+
+/* Maximum number of (rtattr) parameters for each template. */
+#define CRYPTO_MAX_ATTRS 32
+
+struct crypto_attr_alg {
+	char name[CRYPTO_MAX_ALG_NAME];
+};
+
+struct crypto_attr_type {
+	u32 type;
+	u32 mask;
+};
+
+struct crypto_attr_u32 {
+	u32 num;
+};
+
+struct ncrypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
+void ncrypto_free_tfm(struct ncrypto_tfm *tfm);
+
+static inline void sg_set_page(struct scatterlist *sg, struct page *page,
+			       unsigned int len, unsigned int offset)
+{
+	sg->page = page;
+	sg->offset = offset;
+	sg->length = len;
+}
+
+#define sg_page(sg) ((sg)->page)
+
+static inline void sg_mark_end(struct scatterlist *sg)
+{
+}
+
+static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents)
+{
+	memset(sgl, 0, sizeof(*sgl) * nents);
+}
+
+static inline unsigned int ncrypto_tfm_alg_alignmask(struct ncrypto_tfm *tfm)
+{
+	return tfm->__crt_alg->cra_alignmask;
+}
+
+static inline void *ncrypto_tfm_ctx(struct ncrypto_tfm *tfm)
+{
+	return tfm->__crt_ctx;
+}
+
+static inline unsigned int ncrypto_tfm_ctx_alignment(void)
+{
+	struct ncrypto_tfm *tfm;
+	return __alignof__(tfm->__crt_ctx);
+}
+
+#endif	/* _LINUX_NCRYPTO_H */