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[/] [test_project/] [trunk/] [linux_sd_driver/] [crypto/] [api.c] - Blame information for rev 62

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/*
 * 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/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 "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);
 
void crypto_mod_put(struct crypto_alg *alg)
{
        struct module *module = alg->cra_module;
 
        crypto_alg_put(alg);
        module_put(module);
}
EXPORT_SYMBOL_GPL(crypto_mod_put);
 
struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask)
{
        struct crypto_alg *q, *alg = NULL;
        int best = -2;
 
        list_for_each_entry(q, &crypto_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 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);
}
 
static struct crypto_alg *crypto_larval_alloc(const char *name, u32 type,
                                              u32 mask)
{
        struct crypto_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 = CRYPTO_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(&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;
}
 
static 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);
}
 
static struct crypto_alg *crypto_larval_wait(struct crypto_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 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;
}
 
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 (!name)
                return ERR_PTR(-ENOENT);
 
        mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_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;
 
        larval = crypto_larval_alloc(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(crypto_alg_mod_lookup);
 
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 (type->exit)
                        type->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();
 
        }
}
 
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_DIGEST:
                len += crypto_digest_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;
        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 crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
{
        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);
 
/*
 *      crypto_free_tfm - Free crypto transform
 *      @tfm: Transform to free
 *
 *      crypto_free_tfm() frees up the transform and any associated resources,
 *      then drops the refcount on the associated algorithm.
 */
void crypto_free_tfm(struct crypto_tfm *tfm)
{
        struct crypto_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(crypto_free_tfm);
 
int crypto_has_alg(const char *name, u32 type, u32 mask)
{
        int ret = 0;
        struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
 
        if (!IS_ERR(alg)) {
                crypto_mod_put(alg);
                ret = 1;
        }
 
        return ret;
}
EXPORT_SYMBOL_GPL(crypto_has_alg);

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Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [crypto/] [api.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* Scatterlist Cryptographic API.`
3			`*`
4			`* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>`
5			`* Copyright (c) 2002 David S. Miller (davem@redhat.com)`
6			`* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>`
7			`*`
8			`* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>`
9			`* and Nettle, by Niels Möller.`
10			`*`
11			`* This program is free software; you can redistribute it and/or modify it`
12			`* under the terms of the GNU General Public License as published by the Free`
13			`* Software Foundation; either version 2 of the License, or (at your option)`
14			`* any later version.`
15			`*`
16			`*/`
17
18			`#include <linux/err.h>`
19			`#include <linux/errno.h>`
20			`#include <linux/kernel.h>`
21			`#include <linux/kmod.h>`
22			`#include <linux/module.h>`
23			`#include <linux/param.h>`
24			`#include <linux/sched.h>`
25			`#include <linux/slab.h>`
26			`#include <linux/string.h>`
27			`#include "internal.h"`
28
29			`LIST_HEAD(crypto_alg_list);`
30			`EXPORT_SYMBOL_GPL(crypto_alg_list);`
31			`DECLARE_RWSEM(crypto_alg_sem);`
32			`EXPORT_SYMBOL_GPL(crypto_alg_sem);`
33
34			`BLOCKING_NOTIFIER_HEAD(crypto_chain);`
35			`EXPORT_SYMBOL_GPL(crypto_chain);`
36
37			`static inline struct crypto_alg crypto_alg_get(struct crypto_alg alg)`
38			`{`
39			`atomic_inc(&alg->cra_refcnt);`
40			`return alg;`
41			`}`
42
43			`struct crypto_alg crypto_mod_get(struct crypto_alg alg)`
44			`{`
45			`return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;`
46			`}`
47			`EXPORT_SYMBOL_GPL(crypto_mod_get);`
48
49			`void crypto_mod_put(struct crypto_alg *alg)`
50			`{`
51			`struct module *module = alg->cra_module;`
52
53			`crypto_alg_put(alg);`
54			`module_put(module);`
55			`}`
56			`EXPORT_SYMBOL_GPL(crypto_mod_put);`
57
58			`struct crypto_alg __crypto_alg_lookup(const char name, u32 type, u32 mask)`
59			`{`
60			`struct crypto_alg q, alg = NULL;`
61			`int best = -2;`
62
63			`list_for_each_entry(q, &crypto_alg_list, cra_list) {`
64			`int exact, fuzzy;`
65
66			`if (crypto_is_moribund(q))`
67			`continue;`
68
69			`if ((q->cra_flags ^ type) & mask)`
70			`continue;`
71
72			`if (crypto_is_larval(q) &&`
73			`((struct crypto_larval *)q)->mask != mask)`
74			`continue;`
75
76			`exact = !strcmp(q->cra_driver_name, name);`
77			`fuzzy = !strcmp(q->cra_name, name);`
78			`if (!exact && !(fuzzy && q->cra_priority > best))`
79			`continue;`
80
81			`if (unlikely(!crypto_mod_get(q)))`
82			`continue;`
83
84			`best = q->cra_priority;`
85			`if (alg)`
86			`crypto_mod_put(alg);`
87			`alg = q;`
88
89			`if (exact)`
90			`break;`
91			`}`
92
93			`return alg;`
94			`}`
95			`EXPORT_SYMBOL_GPL(__crypto_alg_lookup);`
96
97			`static void crypto_larval_destroy(struct crypto_alg *alg)`
98			`{`
99			`struct crypto_larval larval = (void )alg;`
100
101			`BUG_ON(!crypto_is_larval(alg));`
102			`if (larval->adult)`
103			`crypto_mod_put(larval->adult);`
104			`kfree(larval);`
105			`}`
106
107			`static struct crypto_alg crypto_larval_alloc(const char name, u32 type,`
108			`u32 mask)`
109			`{`
110			`struct crypto_alg *alg;`
111			`struct crypto_larval *larval;`
112
113			`larval = kzalloc(sizeof(*larval), GFP_KERNEL);`
114			`if (!larval)`
115			`return ERR_PTR(-ENOMEM);`
116
117			`larval->mask = mask;`
118			`larval->alg.cra_flags = CRYPTO_ALG_LARVAL \| type;`
119			`larval->alg.cra_priority = -1;`
120			`larval->alg.cra_destroy = crypto_larval_destroy;`
121
122			`atomic_set(&larval->alg.cra_refcnt, 2);`
123			`strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);`
124			`init_completion(&larval->completion);`
125
126			`down_write(&crypto_alg_sem);`
127			`alg = __crypto_alg_lookup(name, type, mask);`
128			`if (!alg) {`
129			`alg = &larval->alg;`
130			`list_add(&alg->cra_list, &crypto_alg_list);`
131			`}`
132			`up_write(&crypto_alg_sem);`
133
134			`if (alg != &larval->alg)`
135			`kfree(larval);`
136
137			`return alg;`
138			`}`
139
140			`static void crypto_larval_kill(struct crypto_alg *alg)`
141			`{`
142			`struct crypto_larval larval = (void )alg;`
143
144			`down_write(&crypto_alg_sem);`
145			`list_del(&alg->cra_list);`
146			`up_write(&crypto_alg_sem);`
147			`complete_all(&larval->completion);`
148			`crypto_alg_put(alg);`
149			`}`
150
151			`static struct crypto_alg crypto_larval_wait(struct crypto_alg alg)`
152			`{`
153			`struct crypto_larval larval = (void )alg;`
154
155			`wait_for_completion_interruptible_timeout(&larval->completion, 60 * HZ);`
156			`alg = larval->adult;`
157			`if (alg) {`
158			`if (!crypto_mod_get(alg))`
159			`alg = ERR_PTR(-EAGAIN);`
160			`} else`
161			`alg = ERR_PTR(-ENOENT);`
162			`crypto_mod_put(&larval->alg);`
163
164			`return alg;`
165			`}`
166
167			`static struct crypto_alg crypto_alg_lookup(const char name, u32 type,`
168			`u32 mask)`
169			`{`
170			`struct crypto_alg *alg;`
171
172			`down_read(&crypto_alg_sem);`
173			`alg = __crypto_alg_lookup(name, type, mask);`
174			`up_read(&crypto_alg_sem);`
175
176			`return alg;`
177			`}`
178
179			`struct crypto_alg crypto_alg_mod_lookup(const char name, u32 type, u32 mask)`
180			`{`
181			`struct crypto_alg *alg;`
182			`struct crypto_alg *larval;`
183			`int ok;`
184
185			`if (!name)`
186			`return ERR_PTR(-ENOENT);`
187
188			`mask &= ~(CRYPTO_ALG_LARVAL \| CRYPTO_ALG_DEAD);`
189			`type &= mask;`
190
191			`alg = try_then_request_module(crypto_alg_lookup(name, type, mask),`
192			`name);`
193			`if (alg)`
194			`return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;`
195
196			`larval = crypto_larval_alloc(name, type, mask);`
197			`if (IS_ERR(larval) \|\| !crypto_is_larval(larval))`
198			`return larval;`
199
200			`ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval);`
201			`if (ok == NOTIFY_DONE) {`
202			`request_module("cryptomgr");`
203			`ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval);`
204			`}`
205
206			`if (ok == NOTIFY_STOP)`
207			`alg = crypto_larval_wait(larval);`
208			`else {`
209			`crypto_mod_put(larval);`
210			`alg = ERR_PTR(-ENOENT);`
211			`}`
212			`crypto_larval_kill(larval);`
213			`return alg;`
214			`}`
215			`EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);`
216
217			`static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)`
218			`{`
219			`const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;`
220
221			`if (type_obj)`
222			`return type_obj->init(tfm, type, mask);`
223
224			`switch (crypto_tfm_alg_type(tfm)) {`
225			`case CRYPTO_ALG_TYPE_CIPHER:`
226			`return crypto_init_cipher_ops(tfm);`
227
228			`case CRYPTO_ALG_TYPE_DIGEST:`
229			`return crypto_init_digest_ops(tfm);`
230
231			`case CRYPTO_ALG_TYPE_COMPRESS:`
232			`return crypto_init_compress_ops(tfm);`
233
234			`default:`
235			`break;`
236			`}`
237
238			`BUG();`
239			`return -EINVAL;`
240			`}`
241
242			`static void crypto_exit_ops(struct crypto_tfm *tfm)`
243			`{`
244			`const struct crypto_type *type = tfm->__crt_alg->cra_type;`
245
246			`if (type) {`
247			`if (type->exit)`
248			`type->exit(tfm);`
249			`return;`
250			`}`
251
252			`switch (crypto_tfm_alg_type(tfm)) {`
253			`case CRYPTO_ALG_TYPE_CIPHER:`
254			`crypto_exit_cipher_ops(tfm);`
255			`break;`
256
257			`case CRYPTO_ALG_TYPE_DIGEST:`
258			`crypto_exit_digest_ops(tfm);`
259			`break;`
260
261			`case CRYPTO_ALG_TYPE_COMPRESS:`
262			`crypto_exit_compress_ops(tfm);`
263			`break;`
264
265			`default:`
266			`BUG();`
267
268			`}`
269			`}`
270
271			`static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)`
272			`{`
273			`const struct crypto_type *type_obj = alg->cra_type;`
274			`unsigned int len;`
275
276			`len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);`
277			`if (type_obj)`
278			`return len + type_obj->ctxsize(alg, type, mask);`
279
280			`switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {`
281			`default:`
282			`BUG();`
283
284			`case CRYPTO_ALG_TYPE_CIPHER:`
285			`len += crypto_cipher_ctxsize(alg);`
286			`break;`
287
288			`case CRYPTO_ALG_TYPE_DIGEST:`
289			`len += crypto_digest_ctxsize(alg);`
290			`break;`
291
292			`case CRYPTO_ALG_TYPE_COMPRESS:`
293			`len += crypto_compress_ctxsize(alg);`
294			`break;`
295			`}`
296
297			`return len;`
298			`}`
299
300			`void crypto_shoot_alg(struct crypto_alg *alg)`
301			`{`
302			`down_write(&crypto_alg_sem);`
303			`alg->cra_flags \|= CRYPTO_ALG_DYING;`
304			`up_write(&crypto_alg_sem);`
305			`}`
306			`EXPORT_SYMBOL_GPL(crypto_shoot_alg);`
307
308			`struct crypto_tfm __crypto_alloc_tfm(struct crypto_alg alg, u32 type,`
309			`u32 mask)`
310			`{`
311			`struct crypto_tfm *tfm = NULL;`
312			`unsigned int tfm_size;`
313			`int err = -ENOMEM;`
314
315			`tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);`
316			`tfm = kzalloc(tfm_size, GFP_KERNEL);`
317			`if (tfm == NULL)`
318			`goto out_err;`
319
320			`tfm->__crt_alg = alg;`
321
322			`err = crypto_init_ops(tfm, type, mask);`
323			`if (err)`
324			`goto out_free_tfm;`
325
326			`if (alg->cra_init && (err = alg->cra_init(tfm))) {`
327			`if (err == -EAGAIN)`
328			`crypto_shoot_alg(alg);`
329			`goto cra_init_failed;`
330			`}`
331
332			`goto out;`
333
334			`cra_init_failed:`
335			`crypto_exit_ops(tfm);`
336			`out_free_tfm:`
337			`kfree(tfm);`
338			`out_err:`
339			`tfm = ERR_PTR(err);`
340			`out:`
341			`return tfm;`
342			`}`
343			`EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);`
344
345			`/*`
346			`* crypto_alloc_base - Locate algorithm and allocate transform`
347			`* @alg_name: Name of algorithm`
348			`* @type: Type of algorithm`
349			`* @mask: Mask for type comparison`
350			`*`
351			`* crypto_alloc_base() will first attempt to locate an already loaded`
352			`* algorithm. If that fails and the kernel supports dynamically loadable`
353			`* modules, it will then attempt to load a module of the same name or`
354			`* alias. If that fails it will send a query to any loaded crypto manager`
355			`* to construct an algorithm on the fly. A refcount is grabbed on the`
356			`* algorithm which is then associated with the new transform.`
357			`*`
358			`* The returned transform is of a non-determinate type. Most people`
359			`* should use one of the more specific allocation functions such as`
360			`* crypto_alloc_blkcipher.`
361			`*`
362			`* In case of error the return value is an error pointer.`
363			`*/`
364			`struct crypto_tfm crypto_alloc_base(const char alg_name, u32 type, u32 mask)`
365			`{`
366			`struct crypto_tfm *tfm;`
367			`int err;`
368
369			`for (;;) {`
370			`struct crypto_alg *alg;`
371
372			`alg = crypto_alg_mod_lookup(alg_name, type, mask);`
373			`if (IS_ERR(alg)) {`
374			`err = PTR_ERR(alg);`
375			`goto err;`
376			`}`
377
378			`tfm = __crypto_alloc_tfm(alg, type, mask);`
379			`if (!IS_ERR(tfm))`
380			`return tfm;`
381
382			`crypto_mod_put(alg);`
383			`err = PTR_ERR(tfm);`
384
385			`err:`
386			`if (err != -EAGAIN)`
387			`break;`
388			`if (signal_pending(current)) {`
389			`err = -EINTR;`
390			`break;`
391			`}`
392			`}`
393
394			`return ERR_PTR(err);`
395			`}`
396			`EXPORT_SYMBOL_GPL(crypto_alloc_base);`
397
398			`/*`
399			`* crypto_free_tfm - Free crypto transform`
400			`* @tfm: Transform to free`
401			`*`
402			`* crypto_free_tfm() frees up the transform and any associated resources,`
403			`* then drops the refcount on the associated algorithm.`
404			`*/`
405			`void crypto_free_tfm(struct crypto_tfm *tfm)`
406			`{`
407			`struct crypto_alg *alg;`
408			`int size;`
409
410			`if (unlikely(!tfm))`
411			`return;`
412
413			`alg = tfm->__crt_alg;`
414			`size = sizeof(*tfm) + alg->cra_ctxsize;`
415
416			`if (alg->cra_exit)`
417			`alg->cra_exit(tfm);`
418			`crypto_exit_ops(tfm);`
419			`crypto_mod_put(alg);`
420			`memset(tfm, 0, size);`
421			`kfree(tfm);`
422			`}`
423
424			`EXPORT_SYMBOL_GPL(crypto_free_tfm);`
425
426			`int crypto_has_alg(const char *name, u32 type, u32 mask)`
427			`{`
428			`int ret = 0;`
429			`struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);`
430
431			`if (!IS_ERR(alg)) {`
432			`crypto_mod_put(alg);`
433			`ret = 1;`
434			`}`
435
436			`return ret;`
437			`}`
438			`EXPORT_SYMBOL_GPL(crypto_has_alg);`