Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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) |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 6 | * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no> |
John Anthony Kazos Jr | 991d174 | 2007-10-19 23:06:17 +0200 | [diff] [blame] | 9 | * and Nettle, by Niels Möller. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Jesper Juhl | a61cc44 | 2005-07-06 13:54:31 -0700 | [diff] [blame] | 17 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 18 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/errno.h> |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 20 | #include <linux/kernel.h> |
Adrian Bunk | 176c365 | 2005-07-06 13:53:09 -0700 | [diff] [blame] | 21 | #include <linux/kmod.h> |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 22 | #include <linux/module.h> |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 23 | #include <linux/param.h> |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 24 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/slab.h> |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 26 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "internal.h" |
| 28 | |
| 29 | LIST_HEAD(crypto_alg_list); |
Herbert Xu | cce9e06 | 2006-08-21 21:08:13 +1000 | [diff] [blame] | 30 | EXPORT_SYMBOL_GPL(crypto_alg_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | DECLARE_RWSEM(crypto_alg_sem); |
Herbert Xu | cce9e06 | 2006-08-21 21:08:13 +1000 | [diff] [blame] | 32 | EXPORT_SYMBOL_GPL(crypto_alg_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 34 | BLOCKING_NOTIFIER_HEAD(crypto_chain); |
| 35 | EXPORT_SYMBOL_GPL(crypto_chain); |
| 36 | |
Herbert Xu | 6521f30 | 2006-08-06 20:28:44 +1000 | [diff] [blame] | 37 | static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | { |
Herbert Xu | 6521f30 | 2006-08-06 20:28:44 +1000 | [diff] [blame] | 39 | atomic_inc(&alg->cra_refcnt); |
| 40 | return alg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | } |
| 42 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 43 | struct crypto_alg *crypto_mod_get(struct crypto_alg *alg) |
Herbert Xu | 6521f30 | 2006-08-06 20:28:44 +1000 | [diff] [blame] | 44 | { |
| 45 | return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL; |
| 46 | } |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 47 | EXPORT_SYMBOL_GPL(crypto_mod_get); |
Herbert Xu | 6521f30 | 2006-08-06 20:28:44 +1000 | [diff] [blame] | 48 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 49 | void crypto_mod_put(struct crypto_alg *alg) |
Herbert Xu | 6521f30 | 2006-08-06 20:28:44 +1000 | [diff] [blame] | 50 | { |
Herbert Xu | da7cd59 | 2007-05-19 14:51:00 +1000 | [diff] [blame] | 51 | struct module *module = alg->cra_module; |
| 52 | |
Herbert Xu | 6521f30 | 2006-08-06 20:28:44 +1000 | [diff] [blame] | 53 | crypto_alg_put(alg); |
Herbert Xu | da7cd59 | 2007-05-19 14:51:00 +1000 | [diff] [blame] | 54 | module_put(module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | } |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 56 | EXPORT_SYMBOL_GPL(crypto_mod_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 58 | static inline int crypto_is_test_larval(struct crypto_larval *larval) |
| 59 | { |
| 60 | return larval->alg.cra_driver_name[0]; |
| 61 | } |
| 62 | |
Herbert Xu | c51b6c8 | 2008-08-04 11:44:59 +0800 | [diff] [blame] | 63 | static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, |
| 64 | u32 mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | { |
| 66 | struct crypto_alg *q, *alg = NULL; |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 67 | int best = -2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 70 | int exact, fuzzy; |
| 71 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 72 | if (crypto_is_moribund(q)) |
| 73 | continue; |
| 74 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 75 | if ((q->cra_flags ^ type) & mask) |
| 76 | continue; |
| 77 | |
| 78 | if (crypto_is_larval(q) && |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 79 | !crypto_is_test_larval((struct crypto_larval *)q) && |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 80 | ((struct crypto_larval *)q)->mask != mask) |
| 81 | continue; |
| 82 | |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 83 | exact = !strcmp(q->cra_driver_name, name); |
| 84 | fuzzy = !strcmp(q->cra_name, name); |
| 85 | if (!exact && !(fuzzy && q->cra_priority > best)) |
| 86 | continue; |
| 87 | |
Herbert Xu | 72fa491 | 2006-05-28 09:05:24 +1000 | [diff] [blame] | 88 | if (unlikely(!crypto_mod_get(q))) |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 89 | continue; |
| 90 | |
| 91 | best = q->cra_priority; |
| 92 | if (alg) |
Herbert Xu | 72fa491 | 2006-05-28 09:05:24 +1000 | [diff] [blame] | 93 | crypto_mod_put(alg); |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 94 | alg = q; |
| 95 | |
| 96 | if (exact) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 99 | |
| 100 | return alg; |
| 101 | } |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 102 | |
| 103 | static void crypto_larval_destroy(struct crypto_alg *alg) |
| 104 | { |
| 105 | struct crypto_larval *larval = (void *)alg; |
| 106 | |
| 107 | BUG_ON(!crypto_is_larval(alg)); |
| 108 | if (larval->adult) |
| 109 | crypto_mod_put(larval->adult); |
| 110 | kfree(larval); |
| 111 | } |
| 112 | |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 113 | struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 114 | { |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 115 | struct crypto_larval *larval; |
| 116 | |
| 117 | larval = kzalloc(sizeof(*larval), GFP_KERNEL); |
| 118 | if (!larval) |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 119 | return ERR_PTR(-ENOMEM); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 120 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 121 | larval->mask = mask; |
| 122 | larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type; |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 123 | larval->alg.cra_priority = -1; |
| 124 | larval->alg.cra_destroy = crypto_larval_destroy; |
| 125 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 126 | strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME); |
| 127 | init_completion(&larval->completion); |
| 128 | |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 129 | return larval; |
| 130 | } |
| 131 | EXPORT_SYMBOL_GPL(crypto_larval_alloc); |
| 132 | |
| 133 | static struct crypto_alg *crypto_larval_add(const char *name, u32 type, |
| 134 | u32 mask) |
| 135 | { |
| 136 | struct crypto_alg *alg; |
| 137 | struct crypto_larval *larval; |
| 138 | |
| 139 | larval = crypto_larval_alloc(name, type, mask); |
| 140 | if (IS_ERR(larval)) |
| 141 | return ERR_CAST(larval); |
| 142 | |
| 143 | atomic_set(&larval->alg.cra_refcnt, 2); |
| 144 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 145 | down_write(&crypto_alg_sem); |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 146 | alg = __crypto_alg_lookup(name, type, mask); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 147 | if (!alg) { |
| 148 | alg = &larval->alg; |
| 149 | list_add(&alg->cra_list, &crypto_alg_list); |
| 150 | } |
| 151 | up_write(&crypto_alg_sem); |
| 152 | |
| 153 | if (alg != &larval->alg) |
| 154 | kfree(larval); |
| 155 | |
| 156 | return alg; |
| 157 | } |
| 158 | |
Herbert Xu | b9c55aa | 2007-12-04 12:46:48 +1100 | [diff] [blame] | 159 | void crypto_larval_kill(struct crypto_alg *alg) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 160 | { |
| 161 | struct crypto_larval *larval = (void *)alg; |
| 162 | |
| 163 | down_write(&crypto_alg_sem); |
| 164 | list_del(&alg->cra_list); |
| 165 | up_write(&crypto_alg_sem); |
Herbert Xu | fe3c520 | 2007-05-19 17:51:40 +1000 | [diff] [blame] | 166 | complete_all(&larval->completion); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 167 | crypto_alg_put(alg); |
| 168 | } |
Herbert Xu | b9c55aa | 2007-12-04 12:46:48 +1100 | [diff] [blame] | 169 | EXPORT_SYMBOL_GPL(crypto_larval_kill); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 170 | |
| 171 | static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg) |
| 172 | { |
| 173 | struct crypto_larval *larval = (void *)alg; |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 174 | long timeout; |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 175 | |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 176 | timeout = wait_for_completion_interruptible_timeout( |
| 177 | &larval->completion, 60 * HZ); |
| 178 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 179 | alg = larval->adult; |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 180 | if (timeout < 0) |
| 181 | alg = ERR_PTR(-EINTR); |
| 182 | else if (!timeout) |
| 183 | alg = ERR_PTR(-ETIMEDOUT); |
| 184 | else if (!alg) |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 185 | alg = ERR_PTR(-ENOENT); |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 186 | else if (crypto_is_test_larval(larval) && |
| 187 | !(alg->cra_flags & CRYPTO_ALG_TESTED)) |
| 188 | alg = ERR_PTR(-EAGAIN); |
| 189 | else if (!crypto_mod_get(alg)) |
| 190 | alg = ERR_PTR(-EAGAIN); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 191 | crypto_mod_put(&larval->alg); |
| 192 | |
| 193 | return alg; |
| 194 | } |
| 195 | |
Herbert Xu | c51b6c8 | 2008-08-04 11:44:59 +0800 | [diff] [blame] | 196 | struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 197 | { |
| 198 | struct crypto_alg *alg; |
| 199 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 200 | down_read(&crypto_alg_sem); |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 201 | alg = __crypto_alg_lookup(name, type, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | up_read(&crypto_alg_sem); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | return alg; |
| 205 | } |
Herbert Xu | c51b6c8 | 2008-08-04 11:44:59 +0800 | [diff] [blame] | 206 | EXPORT_SYMBOL_GPL(crypto_alg_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Herbert Xu | b9c55aa | 2007-12-04 12:46:48 +1100 | [diff] [blame] | 208 | struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask) |
Adrian Bunk | 176c365 | 2005-07-06 13:53:09 -0700 | [diff] [blame] | 209 | { |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 210 | struct crypto_alg *alg; |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 211 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 212 | if (!name) |
| 213 | return ERR_PTR(-ENOENT); |
| 214 | |
| 215 | mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD); |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 216 | type &= mask; |
| 217 | |
Herbert Xu | a760a66 | 2009-02-26 14:06:31 +0800 | [diff] [blame] | 218 | alg = crypto_alg_lookup(name, type, mask); |
| 219 | if (!alg) { |
Alex Riesen | aa07a69 | 2009-06-02 14:13:14 +1000 | [diff] [blame] | 220 | request_module("%s", name); |
Herbert Xu | a760a66 | 2009-02-26 14:06:31 +0800 | [diff] [blame] | 221 | |
Herbert Xu | 37fc334 | 2009-04-21 13:27:16 +0800 | [diff] [blame] | 222 | if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask & |
Alex Riesen | aa07a69 | 2009-06-02 14:13:14 +1000 | [diff] [blame] | 223 | CRYPTO_ALG_NEED_FALLBACK)) |
| 224 | request_module("%s-all", name); |
Herbert Xu | a760a66 | 2009-02-26 14:06:31 +0800 | [diff] [blame] | 225 | |
| 226 | alg = crypto_alg_lookup(name, type, mask); |
| 227 | } |
| 228 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 229 | if (alg) |
| 230 | return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg; |
| 231 | |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 232 | return crypto_larval_add(name, type, mask); |
Herbert Xu | b9c55aa | 2007-12-04 12:46:48 +1100 | [diff] [blame] | 233 | } |
| 234 | EXPORT_SYMBOL_GPL(crypto_larval_lookup); |
| 235 | |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 236 | int crypto_probing_notify(unsigned long val, void *v) |
| 237 | { |
| 238 | int ok; |
| 239 | |
| 240 | ok = blocking_notifier_call_chain(&crypto_chain, val, v); |
| 241 | if (ok == NOTIFY_DONE) { |
| 242 | request_module("cryptomgr"); |
| 243 | ok = blocking_notifier_call_chain(&crypto_chain, val, v); |
| 244 | } |
| 245 | |
| 246 | return ok; |
| 247 | } |
| 248 | EXPORT_SYMBOL_GPL(crypto_probing_notify); |
| 249 | |
Herbert Xu | b9c55aa | 2007-12-04 12:46:48 +1100 | [diff] [blame] | 250 | struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask) |
| 251 | { |
| 252 | struct crypto_alg *alg; |
| 253 | struct crypto_alg *larval; |
| 254 | int ok; |
| 255 | |
Herbert Xu | ff75330 | 2009-02-17 20:18:34 +0800 | [diff] [blame] | 256 | if (!((type | mask) & CRYPTO_ALG_TESTED)) { |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 257 | type |= CRYPTO_ALG_TESTED; |
| 258 | mask |= CRYPTO_ALG_TESTED; |
| 259 | } |
| 260 | |
Herbert Xu | b9c55aa | 2007-12-04 12:46:48 +1100 | [diff] [blame] | 261 | larval = crypto_larval_lookup(name, type, mask); |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 262 | if (IS_ERR(larval) || !crypto_is_larval(larval)) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 263 | return larval; |
| 264 | |
Herbert Xu | 73d3864 | 2008-08-03 21:15:23 +0800 | [diff] [blame] | 265 | ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval); |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 266 | |
| 267 | if (ok == NOTIFY_STOP) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 268 | alg = crypto_larval_wait(larval); |
| 269 | else { |
| 270 | crypto_mod_put(larval); |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 271 | alg = ERR_PTR(-ENOENT); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 272 | } |
| 273 | crypto_larval_kill(larval); |
| 274 | return alg; |
Adrian Bunk | 176c365 | 2005-07-06 13:53:09 -0700 | [diff] [blame] | 275 | } |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 276 | EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup); |
Adrian Bunk | 176c365 | 2005-07-06 13:53:09 -0700 | [diff] [blame] | 277 | |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 278 | static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | { |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 280 | const struct crypto_type *type_obj = tfm->__crt_alg->cra_type; |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame] | 281 | |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 282 | if (type_obj) |
| 283 | return type_obj->init(tfm, type, mask); |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame] | 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | switch (crypto_tfm_alg_type(tfm)) { |
| 286 | case CRYPTO_ALG_TYPE_CIPHER: |
| 287 | return crypto_init_cipher_ops(tfm); |
Loc Ho | 004a403 | 2008-05-14 20:41:47 +0800 | [diff] [blame] | 288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | case CRYPTO_ALG_TYPE_COMPRESS: |
| 290 | return crypto_init_compress_ops(tfm); |
| 291 | |
| 292 | default: |
| 293 | break; |
| 294 | } |
| 295 | |
| 296 | BUG(); |
| 297 | return -EINVAL; |
| 298 | } |
| 299 | |
| 300 | static void crypto_exit_ops(struct crypto_tfm *tfm) |
| 301 | { |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame] | 302 | const struct crypto_type *type = tfm->__crt_alg->cra_type; |
| 303 | |
| 304 | if (type) { |
Herbert Xu | 4a77948 | 2008-09-13 18:19:03 -0700 | [diff] [blame] | 305 | if (tfm->exit) |
| 306 | tfm->exit(tfm); |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame] | 307 | return; |
| 308 | } |
| 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | switch (crypto_tfm_alg_type(tfm)) { |
| 311 | case CRYPTO_ALG_TYPE_CIPHER: |
| 312 | crypto_exit_cipher_ops(tfm); |
| 313 | break; |
Herbert Xu | 6941c3a | 2009-07-12 13:58:04 +0800 | [diff] [blame] | 314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | case CRYPTO_ALG_TYPE_COMPRESS: |
| 316 | crypto_exit_compress_ops(tfm); |
| 317 | break; |
| 318 | |
| 319 | default: |
| 320 | BUG(); |
| 321 | |
| 322 | } |
| 323 | } |
| 324 | |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 325 | static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask) |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 326 | { |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 327 | const struct crypto_type *type_obj = alg->cra_type; |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 328 | unsigned int len; |
| 329 | |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame] | 330 | len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1); |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 331 | if (type_obj) |
| 332 | return len + type_obj->ctxsize(alg, type, mask); |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame] | 333 | |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 334 | switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) { |
| 335 | default: |
| 336 | BUG(); |
| 337 | |
| 338 | case CRYPTO_ALG_TYPE_CIPHER: |
Herbert Xu | f1ddcaf | 2007-01-27 10:05:15 +1100 | [diff] [blame] | 339 | len += crypto_cipher_ctxsize(alg); |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 340 | break; |
Herbert Xu | 6941c3a | 2009-07-12 13:58:04 +0800 | [diff] [blame] | 341 | |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 342 | case CRYPTO_ALG_TYPE_COMPRESS: |
Herbert Xu | f1ddcaf | 2007-01-27 10:05:15 +1100 | [diff] [blame] | 343 | len += crypto_compress_ctxsize(alg); |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 344 | break; |
| 345 | } |
| 346 | |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame] | 347 | return len; |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 348 | } |
| 349 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 350 | void crypto_shoot_alg(struct crypto_alg *alg) |
| 351 | { |
| 352 | down_write(&crypto_alg_sem); |
| 353 | alg->cra_flags |= CRYPTO_ALG_DYING; |
| 354 | up_write(&crypto_alg_sem); |
| 355 | } |
| 356 | EXPORT_SYMBOL_GPL(crypto_shoot_alg); |
| 357 | |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 358 | struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type, |
| 359 | u32 mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
| 361 | struct crypto_tfm *tfm = NULL; |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 362 | unsigned int tfm_size; |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 363 | int err = -ENOMEM; |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 364 | |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 365 | tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask); |
Eric Sesterhenn | bbeb563 | 2006-03-06 21:42:07 +1100 | [diff] [blame] | 366 | tfm = kzalloc(tfm_size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | if (tfm == NULL) |
Akinobu Mita | 9765d26 | 2006-10-11 22:29:51 +1000 | [diff] [blame] | 368 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | tfm->__crt_alg = alg; |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 371 | |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 372 | err = crypto_init_ops(tfm, type, mask); |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 373 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | goto out_free_tfm; |
Herbert Xu | c7fc059 | 2006-05-24 13:02:26 +1000 | [diff] [blame] | 375 | |
Herbert Xu | 4a77948 | 2008-09-13 18:19:03 -0700 | [diff] [blame] | 376 | if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm))) |
Herbert Xu | c7fc059 | 2006-05-24 13:02:26 +1000 | [diff] [blame] | 377 | goto cra_init_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | goto out; |
| 380 | |
Herbert Xu | c7fc059 | 2006-05-24 13:02:26 +1000 | [diff] [blame] | 381 | cra_init_failed: |
| 382 | crypto_exit_ops(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | out_free_tfm: |
Herbert Xu | 4a77948 | 2008-09-13 18:19:03 -0700 | [diff] [blame] | 384 | if (err == -EAGAIN) |
| 385 | crypto_shoot_alg(alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | kfree(tfm); |
Akinobu Mita | 9765d26 | 2006-10-11 22:29:51 +1000 | [diff] [blame] | 387 | out_err: |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 388 | tfm = ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | out: |
| 390 | return tfm; |
| 391 | } |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 392 | EXPORT_SYMBOL_GPL(__crypto_alloc_tfm); |
| 393 | |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 394 | /* |
| 395 | * crypto_alloc_base - Locate algorithm and allocate transform |
| 396 | * @alg_name: Name of algorithm |
| 397 | * @type: Type of algorithm |
| 398 | * @mask: Mask for type comparison |
| 399 | * |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 400 | * This function should not be used by new algorithm types. |
| 401 | * Plesae use crypto_alloc_tfm instead. |
| 402 | * |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 403 | * crypto_alloc_base() will first attempt to locate an already loaded |
| 404 | * algorithm. If that fails and the kernel supports dynamically loadable |
| 405 | * modules, it will then attempt to load a module of the same name or |
| 406 | * alias. If that fails it will send a query to any loaded crypto manager |
| 407 | * to construct an algorithm on the fly. A refcount is grabbed on the |
| 408 | * algorithm which is then associated with the new transform. |
| 409 | * |
| 410 | * The returned transform is of a non-determinate type. Most people |
| 411 | * should use one of the more specific allocation functions such as |
| 412 | * crypto_alloc_blkcipher. |
| 413 | * |
| 414 | * In case of error the return value is an error pointer. |
| 415 | */ |
| 416 | struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask) |
| 417 | { |
| 418 | struct crypto_tfm *tfm; |
| 419 | int err; |
| 420 | |
| 421 | for (;;) { |
| 422 | struct crypto_alg *alg; |
| 423 | |
| 424 | alg = crypto_alg_mod_lookup(alg_name, type, mask); |
Akinobu Mita | 9765d26 | 2006-10-11 22:29:51 +1000 | [diff] [blame] | 425 | if (IS_ERR(alg)) { |
| 426 | err = PTR_ERR(alg); |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 427 | goto err; |
Akinobu Mita | 9765d26 | 2006-10-11 22:29:51 +1000 | [diff] [blame] | 428 | } |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 429 | |
Herbert Xu | 27d2a33 | 2007-01-24 20:50:26 +1100 | [diff] [blame] | 430 | tfm = __crypto_alloc_tfm(alg, type, mask); |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 431 | if (!IS_ERR(tfm)) |
Akinobu Mita | 9765d26 | 2006-10-11 22:29:51 +1000 | [diff] [blame] | 432 | return tfm; |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 433 | |
| 434 | crypto_mod_put(alg); |
| 435 | err = PTR_ERR(tfm); |
| 436 | |
| 437 | err: |
| 438 | if (err != -EAGAIN) |
| 439 | break; |
| 440 | if (signal_pending(current)) { |
| 441 | err = -EINTR; |
| 442 | break; |
| 443 | } |
Akinobu Mita | 9765d26 | 2006-10-11 22:29:51 +1000 | [diff] [blame] | 444 | } |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 445 | |
Akinobu Mita | 9765d26 | 2006-10-11 22:29:51 +1000 | [diff] [blame] | 446 | return ERR_PTR(err); |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 447 | } |
| 448 | EXPORT_SYMBOL_GPL(crypto_alloc_base); |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 449 | |
Herbert Xu | 3f683d6 | 2009-02-18 16:56:59 +0800 | [diff] [blame] | 450 | void *crypto_create_tfm(struct crypto_alg *alg, |
| 451 | const struct crypto_type *frontend) |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 452 | { |
| 453 | char *mem; |
| 454 | struct crypto_tfm *tfm = NULL; |
| 455 | unsigned int tfmsize; |
| 456 | unsigned int total; |
| 457 | int err = -ENOMEM; |
| 458 | |
| 459 | tfmsize = frontend->tfmsize; |
Herbert Xu | 2ca33da | 2009-07-13 20:46:25 +0800 | [diff] [blame^] | 460 | total = tfmsize + sizeof(*tfm) + frontend->extsize(alg); |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 461 | |
| 462 | mem = kzalloc(total, GFP_KERNEL); |
| 463 | if (mem == NULL) |
| 464 | goto out_err; |
| 465 | |
| 466 | tfm = (struct crypto_tfm *)(mem + tfmsize); |
| 467 | tfm->__crt_alg = alg; |
| 468 | |
Herbert Xu | 2ca33da | 2009-07-13 20:46:25 +0800 | [diff] [blame^] | 469 | err = frontend->init_tfm(tfm); |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 470 | if (err) |
| 471 | goto out_free_tfm; |
| 472 | |
| 473 | if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm))) |
| 474 | goto cra_init_failed; |
| 475 | |
| 476 | goto out; |
| 477 | |
| 478 | cra_init_failed: |
| 479 | crypto_exit_ops(tfm); |
| 480 | out_free_tfm: |
| 481 | if (err == -EAGAIN) |
| 482 | crypto_shoot_alg(alg); |
| 483 | kfree(mem); |
| 484 | out_err: |
Herbert Xu | 3f683d6 | 2009-02-18 16:56:59 +0800 | [diff] [blame] | 485 | mem = ERR_PTR(err); |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 486 | out: |
Herbert Xu | 3f683d6 | 2009-02-18 16:56:59 +0800 | [diff] [blame] | 487 | return mem; |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 488 | } |
| 489 | EXPORT_SYMBOL_GPL(crypto_create_tfm); |
| 490 | |
Herbert Xu | d06854f | 2009-07-08 17:53:16 +0800 | [diff] [blame] | 491 | struct crypto_alg *crypto_find_alg(const char *alg_name, |
| 492 | const struct crypto_type *frontend, |
| 493 | u32 type, u32 mask) |
| 494 | { |
| 495 | struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) = |
| 496 | crypto_alg_mod_lookup; |
| 497 | |
| 498 | if (frontend) { |
| 499 | type &= frontend->maskclear; |
| 500 | mask &= frontend->maskclear; |
| 501 | type |= frontend->type; |
| 502 | mask |= frontend->maskset; |
| 503 | |
| 504 | if (frontend->lookup) |
| 505 | lookup = frontend->lookup; |
| 506 | } |
| 507 | |
| 508 | return lookup(alg_name, type, mask); |
| 509 | } |
| 510 | EXPORT_SYMBOL_GPL(crypto_find_alg); |
| 511 | |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 512 | /* |
| 513 | * crypto_alloc_tfm - Locate algorithm and allocate transform |
| 514 | * @alg_name: Name of algorithm |
| 515 | * @frontend: Frontend algorithm type |
| 516 | * @type: Type of algorithm |
| 517 | * @mask: Mask for type comparison |
| 518 | * |
| 519 | * crypto_alloc_tfm() will first attempt to locate an already loaded |
| 520 | * algorithm. If that fails and the kernel supports dynamically loadable |
| 521 | * modules, it will then attempt to load a module of the same name or |
| 522 | * alias. If that fails it will send a query to any loaded crypto manager |
| 523 | * to construct an algorithm on the fly. A refcount is grabbed on the |
| 524 | * algorithm which is then associated with the new transform. |
| 525 | * |
| 526 | * The returned transform is of a non-determinate type. Most people |
| 527 | * should use one of the more specific allocation functions such as |
| 528 | * crypto_alloc_blkcipher. |
| 529 | * |
| 530 | * In case of error the return value is an error pointer. |
| 531 | */ |
Herbert Xu | 3f683d6 | 2009-02-18 16:56:59 +0800 | [diff] [blame] | 532 | void *crypto_alloc_tfm(const char *alg_name, |
| 533 | const struct crypto_type *frontend, u32 type, u32 mask) |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 534 | { |
Herbert Xu | 3f683d6 | 2009-02-18 16:56:59 +0800 | [diff] [blame] | 535 | void *tfm; |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 536 | int err; |
| 537 | |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 538 | for (;;) { |
| 539 | struct crypto_alg *alg; |
| 540 | |
Herbert Xu | d06854f | 2009-07-08 17:53:16 +0800 | [diff] [blame] | 541 | alg = crypto_find_alg(alg_name, frontend, type, mask); |
Herbert Xu | 7b0bac6 | 2008-09-21 06:52:53 +0900 | [diff] [blame] | 542 | if (IS_ERR(alg)) { |
| 543 | err = PTR_ERR(alg); |
| 544 | goto err; |
| 545 | } |
| 546 | |
| 547 | tfm = crypto_create_tfm(alg, frontend); |
| 548 | if (!IS_ERR(tfm)) |
| 549 | return tfm; |
| 550 | |
| 551 | crypto_mod_put(alg); |
| 552 | err = PTR_ERR(tfm); |
| 553 | |
| 554 | err: |
| 555 | if (err != -EAGAIN) |
| 556 | break; |
| 557 | if (signal_pending(current)) { |
| 558 | err = -EINTR; |
| 559 | break; |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | return ERR_PTR(err); |
| 564 | } |
| 565 | EXPORT_SYMBOL_GPL(crypto_alloc_tfm); |
Herbert Xu | 7b2cd92 | 2009-02-05 16:48:24 +1100 | [diff] [blame] | 566 | |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 567 | /* |
Herbert Xu | 7b2cd92 | 2009-02-05 16:48:24 +1100 | [diff] [blame] | 568 | * crypto_destroy_tfm - Free crypto transform |
| 569 | * @mem: Start of tfm slab |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 570 | * @tfm: Transform to free |
| 571 | * |
Herbert Xu | 7b2cd92 | 2009-02-05 16:48:24 +1100 | [diff] [blame] | 572 | * This function frees up the transform and any associated resources, |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 573 | * then drops the refcount on the associated algorithm. |
| 574 | */ |
Herbert Xu | 7b2cd92 | 2009-02-05 16:48:24 +1100 | [diff] [blame] | 575 | void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | { |
Jesper Juhl | a61cc44 | 2005-07-06 13:54:31 -0700 | [diff] [blame] | 577 | struct crypto_alg *alg; |
Jesper Juhl | a61cc44 | 2005-07-06 13:54:31 -0700 | [diff] [blame] | 578 | |
Herbert Xu | 7b2cd92 | 2009-02-05 16:48:24 +1100 | [diff] [blame] | 579 | if (unlikely(!mem)) |
Jesper Juhl | a61cc44 | 2005-07-06 13:54:31 -0700 | [diff] [blame] | 580 | return; |
| 581 | |
| 582 | alg = tfm->__crt_alg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Herbert Xu | 4a77948 | 2008-09-13 18:19:03 -0700 | [diff] [blame] | 584 | if (!tfm->exit && alg->cra_exit) |
Herbert Xu | c7fc059 | 2006-05-24 13:02:26 +1000 | [diff] [blame] | 585 | alg->cra_exit(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | crypto_exit_ops(tfm); |
Herbert Xu | 72fa491 | 2006-05-28 09:05:24 +1000 | [diff] [blame] | 587 | crypto_mod_put(alg); |
Johannes Weiner | 811d8f0 | 2009-03-29 15:20:48 +0800 | [diff] [blame] | 588 | kzfree(mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
Herbert Xu | 7b2cd92 | 2009-02-05 16:48:24 +1100 | [diff] [blame] | 590 | EXPORT_SYMBOL_GPL(crypto_destroy_tfm); |
Herbert Xu | fce32d7 | 2006-08-26 17:35:45 +1000 | [diff] [blame] | 591 | |
| 592 | int crypto_has_alg(const char *name, u32 type, u32 mask) |
| 593 | { |
| 594 | int ret = 0; |
| 595 | struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask); |
| 596 | |
| 597 | if (!IS_ERR(alg)) { |
| 598 | crypto_mod_put(alg); |
| 599 | ret = 1; |
| 600 | } |
| 601 | |
| 602 | return ret; |
| 603 | } |
| 604 | EXPORT_SYMBOL_GPL(crypto_has_alg); |
Sebastian Siewior | c3715cb9 | 2008-03-30 16:36:09 +0800 | [diff] [blame] | 605 | |
| 606 | MODULE_DESCRIPTION("Cryptographic core API"); |
| 607 | MODULE_LICENSE("GPL"); |