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> |
| 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 | */ |
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 | { |
| 51 | crypto_alg_put(alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | module_put(alg->cra_module); |
| 53 | } |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 54 | EXPORT_SYMBOL_GPL(crypto_mod_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 56 | struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | { |
| 58 | struct crypto_alg *q, *alg = NULL; |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 59 | int best = -2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 62 | int exact, fuzzy; |
| 63 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 64 | if (crypto_is_moribund(q)) |
| 65 | continue; |
| 66 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 67 | if ((q->cra_flags ^ type) & mask) |
| 68 | continue; |
| 69 | |
| 70 | if (crypto_is_larval(q) && |
| 71 | ((struct crypto_larval *)q)->mask != mask) |
| 72 | continue; |
| 73 | |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 74 | exact = !strcmp(q->cra_driver_name, name); |
| 75 | fuzzy = !strcmp(q->cra_name, name); |
| 76 | if (!exact && !(fuzzy && q->cra_priority > best)) |
| 77 | continue; |
| 78 | |
Herbert Xu | 72fa491 | 2006-05-28 09:05:24 +1000 | [diff] [blame] | 79 | if (unlikely(!crypto_mod_get(q))) |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 80 | continue; |
| 81 | |
| 82 | best = q->cra_priority; |
| 83 | if (alg) |
Herbert Xu | 72fa491 | 2006-05-28 09:05:24 +1000 | [diff] [blame] | 84 | crypto_mod_put(alg); |
Herbert Xu | 5cb1454 | 2005-11-05 16:58:14 +1100 | [diff] [blame] | 85 | alg = q; |
| 86 | |
| 87 | if (exact) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | } |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 90 | |
| 91 | return alg; |
| 92 | } |
| 93 | EXPORT_SYMBOL_GPL(__crypto_alg_lookup); |
| 94 | |
| 95 | static void crypto_larval_destroy(struct crypto_alg *alg) |
| 96 | { |
| 97 | struct crypto_larval *larval = (void *)alg; |
| 98 | |
| 99 | BUG_ON(!crypto_is_larval(alg)); |
| 100 | if (larval->adult) |
| 101 | crypto_mod_put(larval->adult); |
| 102 | kfree(larval); |
| 103 | } |
| 104 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 105 | static struct crypto_alg *crypto_larval_alloc(const char *name, u32 type, |
| 106 | u32 mask) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 107 | { |
| 108 | struct crypto_alg *alg; |
| 109 | struct crypto_larval *larval; |
| 110 | |
| 111 | larval = kzalloc(sizeof(*larval), GFP_KERNEL); |
| 112 | if (!larval) |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 113 | return ERR_PTR(-ENOMEM); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 114 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 115 | larval->mask = mask; |
| 116 | larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type; |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 117 | larval->alg.cra_priority = -1; |
| 118 | larval->alg.cra_destroy = crypto_larval_destroy; |
| 119 | |
| 120 | atomic_set(&larval->alg.cra_refcnt, 2); |
| 121 | strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME); |
| 122 | init_completion(&larval->completion); |
| 123 | |
| 124 | down_write(&crypto_alg_sem); |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 125 | alg = __crypto_alg_lookup(name, type, mask); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 126 | if (!alg) { |
| 127 | alg = &larval->alg; |
| 128 | list_add(&alg->cra_list, &crypto_alg_list); |
| 129 | } |
| 130 | up_write(&crypto_alg_sem); |
| 131 | |
| 132 | if (alg != &larval->alg) |
| 133 | kfree(larval); |
| 134 | |
| 135 | return alg; |
| 136 | } |
| 137 | |
| 138 | static void crypto_larval_kill(struct crypto_alg *alg) |
| 139 | { |
| 140 | struct crypto_larval *larval = (void *)alg; |
| 141 | |
| 142 | down_write(&crypto_alg_sem); |
| 143 | list_del(&alg->cra_list); |
| 144 | up_write(&crypto_alg_sem); |
| 145 | complete(&larval->completion); |
| 146 | crypto_alg_put(alg); |
| 147 | } |
| 148 | |
| 149 | static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg) |
| 150 | { |
| 151 | struct crypto_larval *larval = (void *)alg; |
| 152 | |
| 153 | wait_for_completion_interruptible_timeout(&larval->completion, 60 * HZ); |
| 154 | alg = larval->adult; |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 155 | if (alg) { |
| 156 | if (!crypto_mod_get(alg)) |
| 157 | alg = ERR_PTR(-EAGAIN); |
| 158 | } else |
| 159 | alg = ERR_PTR(-ENOENT); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 160 | crypto_mod_put(&larval->alg); |
| 161 | |
| 162 | return alg; |
| 163 | } |
| 164 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 165 | static struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, |
| 166 | u32 mask) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 167 | { |
| 168 | struct crypto_alg *alg; |
| 169 | |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 170 | down_read(&crypto_alg_sem); |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 171 | alg = __crypto_alg_lookup(name, type, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | up_read(&crypto_alg_sem); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | return alg; |
| 175 | } |
| 176 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 177 | struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask) |
Adrian Bunk | 176c365 | 2005-07-06 13:53:09 -0700 | [diff] [blame] | 178 | { |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 179 | struct crypto_alg *alg; |
| 180 | struct crypto_alg *larval; |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 181 | int ok; |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 182 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 183 | if (!name) |
| 184 | return ERR_PTR(-ENOENT); |
| 185 | |
| 186 | mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD); |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 187 | type &= mask; |
| 188 | |
| 189 | alg = try_then_request_module(crypto_alg_lookup(name, type, mask), |
| 190 | name); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 191 | if (alg) |
| 192 | return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg; |
| 193 | |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 194 | larval = crypto_larval_alloc(name, type, mask); |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 195 | if (IS_ERR(larval) || !crypto_is_larval(larval)) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 196 | return larval; |
| 197 | |
Herbert Xu | 2b8c19d | 2006-09-21 11:31:44 +1000 | [diff] [blame] | 198 | ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval); |
| 199 | if (ok == NOTIFY_DONE) { |
| 200 | request_module("cryptomgr"); |
| 201 | ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval); |
| 202 | } |
| 203 | |
| 204 | if (ok == NOTIFY_STOP) |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 205 | alg = crypto_larval_wait(larval); |
| 206 | else { |
| 207 | crypto_mod_put(larval); |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 208 | alg = ERR_PTR(-ENOENT); |
Herbert Xu | 2825982 | 2006-08-06 21:23:26 +1000 | [diff] [blame] | 209 | } |
| 210 | crypto_larval_kill(larval); |
| 211 | return alg; |
Adrian Bunk | 176c365 | 2005-07-06 13:53:09 -0700 | [diff] [blame] | 212 | } |
Herbert Xu | 492e2b6 | 2006-09-21 11:35:17 +1000 | [diff] [blame] | 213 | EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup); |
Adrian Bunk | 176c365 | 2005-07-06 13:53:09 -0700 | [diff] [blame] | 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | static int crypto_init_flags(struct crypto_tfm *tfm, u32 flags) |
| 216 | { |
Herbert Xu | 64baf3c | 2005-09-01 17:43:05 -0700 | [diff] [blame] | 217 | tfm->crt_flags = flags & CRYPTO_TFM_REQ_MASK; |
| 218 | flags &= ~CRYPTO_TFM_REQ_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | switch (crypto_tfm_alg_type(tfm)) { |
| 221 | case CRYPTO_ALG_TYPE_CIPHER: |
| 222 | return crypto_init_cipher_flags(tfm, flags); |
| 223 | |
| 224 | case CRYPTO_ALG_TYPE_DIGEST: |
| 225 | return crypto_init_digest_flags(tfm, flags); |
| 226 | |
| 227 | case CRYPTO_ALG_TYPE_COMPRESS: |
| 228 | return crypto_init_compress_flags(tfm, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 231 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | static int crypto_init_ops(struct crypto_tfm *tfm) |
| 235 | { |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 236 | const struct crypto_type *type = tfm->__crt_alg->cra_type; |
| 237 | |
| 238 | if (type) |
| 239 | return type->init(tfm); |
| 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | switch (crypto_tfm_alg_type(tfm)) { |
| 242 | case CRYPTO_ALG_TYPE_CIPHER: |
| 243 | return crypto_init_cipher_ops(tfm); |
| 244 | |
| 245 | case CRYPTO_ALG_TYPE_DIGEST: |
| 246 | return crypto_init_digest_ops(tfm); |
| 247 | |
| 248 | case CRYPTO_ALG_TYPE_COMPRESS: |
| 249 | return crypto_init_compress_ops(tfm); |
| 250 | |
| 251 | default: |
| 252 | break; |
| 253 | } |
| 254 | |
| 255 | BUG(); |
| 256 | return -EINVAL; |
| 257 | } |
| 258 | |
| 259 | static void crypto_exit_ops(struct crypto_tfm *tfm) |
| 260 | { |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 261 | const struct crypto_type *type = tfm->__crt_alg->cra_type; |
| 262 | |
| 263 | if (type) { |
| 264 | if (type->exit) |
| 265 | type->exit(tfm); |
| 266 | return; |
| 267 | } |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | switch (crypto_tfm_alg_type(tfm)) { |
| 270 | case CRYPTO_ALG_TYPE_CIPHER: |
| 271 | crypto_exit_cipher_ops(tfm); |
| 272 | break; |
| 273 | |
| 274 | case CRYPTO_ALG_TYPE_DIGEST: |
| 275 | crypto_exit_digest_ops(tfm); |
| 276 | break; |
| 277 | |
| 278 | case CRYPTO_ALG_TYPE_COMPRESS: |
| 279 | crypto_exit_compress_ops(tfm); |
| 280 | break; |
| 281 | |
| 282 | default: |
| 283 | BUG(); |
| 284 | |
| 285 | } |
| 286 | } |
| 287 | |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 288 | static unsigned int crypto_ctxsize(struct crypto_alg *alg, int flags) |
| 289 | { |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 290 | const struct crypto_type *type = alg->cra_type; |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 291 | unsigned int len; |
| 292 | |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 293 | len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1); |
| 294 | if (type) |
| 295 | return len + type->ctxsize(alg); |
| 296 | |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 297 | switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) { |
| 298 | default: |
| 299 | BUG(); |
| 300 | |
| 301 | case CRYPTO_ALG_TYPE_CIPHER: |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 302 | len += crypto_cipher_ctxsize(alg, flags); |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 303 | break; |
| 304 | |
| 305 | case CRYPTO_ALG_TYPE_DIGEST: |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 306 | len += crypto_digest_ctxsize(alg, flags); |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 307 | break; |
| 308 | |
| 309 | case CRYPTO_ALG_TYPE_COMPRESS: |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 310 | len += crypto_compress_ctxsize(alg, flags); |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 311 | break; |
| 312 | } |
| 313 | |
Herbert Xu | e853c3c | 2006-08-22 00:06:54 +1000 | [diff] [blame^] | 314 | return len; |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 315 | } |
| 316 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 317 | void crypto_shoot_alg(struct crypto_alg *alg) |
| 318 | { |
| 319 | down_write(&crypto_alg_sem); |
| 320 | alg->cra_flags |= CRYPTO_ALG_DYING; |
| 321 | up_write(&crypto_alg_sem); |
| 322 | } |
| 323 | EXPORT_SYMBOL_GPL(crypto_shoot_alg); |
| 324 | |
| 325 | struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | { |
| 327 | struct crypto_tfm *tfm = NULL; |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 328 | unsigned int tfm_size; |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 329 | int err = -ENOMEM; |
Herbert Xu | fbdae9f | 2005-07-06 13:53:29 -0700 | [diff] [blame] | 330 | |
| 331 | tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, flags); |
Eric Sesterhenn | bbeb563 | 2006-03-06 21:42:07 +1100 | [diff] [blame] | 332 | tfm = kzalloc(tfm_size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | if (tfm == NULL) |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 334 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | tfm->__crt_alg = alg; |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 337 | |
| 338 | err = crypto_init_flags(tfm, flags); |
| 339 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | goto out_free_tfm; |
| 341 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 342 | err = crypto_init_ops(tfm); |
| 343 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | goto out_free_tfm; |
Herbert Xu | c7fc059 | 2006-05-24 13:02:26 +1000 | [diff] [blame] | 345 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 346 | if (alg->cra_init && (err = alg->cra_init(tfm))) { |
| 347 | if (err == -EAGAIN) |
| 348 | crypto_shoot_alg(alg); |
Herbert Xu | c7fc059 | 2006-05-24 13:02:26 +1000 | [diff] [blame] | 349 | goto cra_init_failed; |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 350 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
| 352 | goto out; |
| 353 | |
Herbert Xu | c7fc059 | 2006-05-24 13:02:26 +1000 | [diff] [blame] | 354 | cra_init_failed: |
| 355 | crypto_exit_ops(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | out_free_tfm: |
| 357 | kfree(tfm); |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 358 | tfm = ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | out: |
| 360 | return tfm; |
| 361 | } |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 362 | EXPORT_SYMBOL_GPL(__crypto_alloc_tfm); |
| 363 | |
| 364 | struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags) |
| 365 | { |
| 366 | struct crypto_tfm *tfm = NULL; |
| 367 | int err; |
| 368 | |
| 369 | do { |
| 370 | struct crypto_alg *alg; |
| 371 | |
Herbert Xu | f3f632d | 2006-08-06 23:12:59 +1000 | [diff] [blame] | 372 | alg = crypto_alg_mod_lookup(name, 0, CRYPTO_ALG_ASYNC); |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 373 | err = PTR_ERR(alg); |
| 374 | if (IS_ERR(alg)) |
| 375 | continue; |
| 376 | |
| 377 | tfm = __crypto_alloc_tfm(alg, flags); |
| 378 | err = 0; |
| 379 | if (IS_ERR(tfm)) { |
| 380 | crypto_mod_put(alg); |
| 381 | err = PTR_ERR(tfm); |
| 382 | tfm = NULL; |
| 383 | } |
| 384 | } while (err == -EAGAIN && !signal_pending(current)); |
| 385 | |
| 386 | return tfm; |
| 387 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Herbert Xu | 6d7d684 | 2006-07-30 11:53:01 +1000 | [diff] [blame] | 389 | /* |
| 390 | * crypto_alloc_base - Locate algorithm and allocate transform |
| 391 | * @alg_name: Name of algorithm |
| 392 | * @type: Type of algorithm |
| 393 | * @mask: Mask for type comparison |
| 394 | * |
| 395 | * crypto_alloc_base() will first attempt to locate an already loaded |
| 396 | * algorithm. If that fails and the kernel supports dynamically loadable |
| 397 | * modules, it will then attempt to load a module of the same name or |
| 398 | * alias. If that fails it will send a query to any loaded crypto manager |
| 399 | * to construct an algorithm on the fly. A refcount is grabbed on the |
| 400 | * algorithm which is then associated with the new transform. |
| 401 | * |
| 402 | * The returned transform is of a non-determinate type. Most people |
| 403 | * should use one of the more specific allocation functions such as |
| 404 | * crypto_alloc_blkcipher. |
| 405 | * |
| 406 | * In case of error the return value is an error pointer. |
| 407 | */ |
| 408 | struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask) |
| 409 | { |
| 410 | struct crypto_tfm *tfm; |
| 411 | int err; |
| 412 | |
| 413 | for (;;) { |
| 414 | struct crypto_alg *alg; |
| 415 | |
| 416 | alg = crypto_alg_mod_lookup(alg_name, type, mask); |
| 417 | err = PTR_ERR(alg); |
| 418 | tfm = ERR_PTR(err); |
| 419 | if (IS_ERR(alg)) |
| 420 | goto err; |
| 421 | |
| 422 | tfm = __crypto_alloc_tfm(alg, 0); |
| 423 | if (!IS_ERR(tfm)) |
| 424 | break; |
| 425 | |
| 426 | crypto_mod_put(alg); |
| 427 | err = PTR_ERR(tfm); |
| 428 | |
| 429 | err: |
| 430 | if (err != -EAGAIN) |
| 431 | break; |
| 432 | if (signal_pending(current)) { |
| 433 | err = -EINTR; |
| 434 | break; |
| 435 | } |
| 436 | }; |
| 437 | |
| 438 | return tfm; |
| 439 | } |
| 440 | EXPORT_SYMBOL_GPL(crypto_alloc_base); |
| 441 | |
| 442 | /* |
| 443 | * crypto_free_tfm - Free crypto transform |
| 444 | * @tfm: Transform to free |
| 445 | * |
| 446 | * crypto_free_tfm() frees up the transform and any associated resources, |
| 447 | * then drops the refcount on the associated algorithm. |
| 448 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | void crypto_free_tfm(struct crypto_tfm *tfm) |
| 450 | { |
Jesper Juhl | a61cc44 | 2005-07-06 13:54:31 -0700 | [diff] [blame] | 451 | struct crypto_alg *alg; |
| 452 | int size; |
| 453 | |
| 454 | if (unlikely(!tfm)) |
| 455 | return; |
| 456 | |
| 457 | alg = tfm->__crt_alg; |
| 458 | size = sizeof(*tfm) + alg->cra_ctxsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Herbert Xu | c7fc059 | 2006-05-24 13:02:26 +1000 | [diff] [blame] | 460 | if (alg->cra_exit) |
| 461 | alg->cra_exit(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | crypto_exit_ops(tfm); |
Herbert Xu | 72fa491 | 2006-05-28 09:05:24 +1000 | [diff] [blame] | 463 | crypto_mod_put(alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | memset(tfm, 0, size); |
| 465 | kfree(tfm); |
| 466 | } |
| 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | int crypto_alg_available(const char *name, u32 flags) |
| 469 | { |
| 470 | int ret = 0; |
Herbert Xu | f3f632d | 2006-08-06 23:12:59 +1000 | [diff] [blame] | 471 | struct crypto_alg *alg = crypto_alg_mod_lookup(name, 0, |
| 472 | CRYPTO_ALG_ASYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
Herbert Xu | 6bfd480 | 2006-09-21 11:39:29 +1000 | [diff] [blame] | 474 | if (!IS_ERR(alg)) { |
Herbert Xu | 72fa491 | 2006-05-28 09:05:24 +1000 | [diff] [blame] | 475 | crypto_mod_put(alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | ret = 1; |
| 477 | } |
| 478 | |
| 479 | return ret; |
| 480 | } |
| 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | EXPORT_SYMBOL_GPL(crypto_alloc_tfm); |
| 483 | EXPORT_SYMBOL_GPL(crypto_free_tfm); |
| 484 | EXPORT_SYMBOL_GPL(crypto_alg_available); |