aead.c 7.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * AEAD: Authenticated Encryption with Associated Data
  4. *
  5. * This file provides API support for AEAD algorithms.
  6. *
  7. * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
  8. */
  9. #include <crypto/internal/aead.h>
  10. #include <linux/errno.h>
  11. #include <linux/init.h>
  12. #include <linux/kernel.h>
  13. #include <linux/module.h>
  14. #include <linux/slab.h>
  15. #include <linux/seq_file.h>
  16. #include <linux/cryptouser.h>
  17. #include <net/netlink.h>
  18. #include "internal.h"
  19. static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
  20. unsigned int keylen)
  21. {
  22. unsigned long alignmask = crypto_aead_alignmask(tfm);
  23. int ret;
  24. u8 *buffer, *alignbuffer;
  25. unsigned long absize;
  26. absize = keylen + alignmask;
  27. buffer = kmalloc(absize, GFP_ATOMIC);
  28. if (!buffer)
  29. return -ENOMEM;
  30. alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
  31. memcpy(alignbuffer, key, keylen);
  32. ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
  33. memset(alignbuffer, 0, keylen);
  34. kfree(buffer);
  35. return ret;
  36. }
  37. int crypto_aead_setkey(struct crypto_aead *tfm,
  38. const u8 *key, unsigned int keylen)
  39. {
  40. unsigned long alignmask = crypto_aead_alignmask(tfm);
  41. int err;
  42. if ((unsigned long)key & alignmask)
  43. err = setkey_unaligned(tfm, key, keylen);
  44. else
  45. err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
  46. if (unlikely(err)) {
  47. crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
  48. return err;
  49. }
  50. crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
  51. return 0;
  52. }
  53. EXPORT_SYMBOL_GPL(crypto_aead_setkey);
  54. int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
  55. {
  56. int err;
  57. if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
  58. authsize > crypto_aead_maxauthsize(tfm))
  59. return -EINVAL;
  60. if (crypto_aead_alg(tfm)->setauthsize) {
  61. err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
  62. if (err)
  63. return err;
  64. }
  65. tfm->authsize = authsize;
  66. return 0;
  67. }
  68. EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
  69. int crypto_aead_encrypt(struct aead_request *req)
  70. {
  71. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  72. struct crypto_alg *alg = aead->base.__crt_alg;
  73. unsigned int cryptlen = req->cryptlen;
  74. int ret;
  75. crypto_stats_get(alg);
  76. if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
  77. ret = -ENOKEY;
  78. else
  79. ret = crypto_aead_alg(aead)->encrypt(req);
  80. crypto_stats_aead_encrypt(cryptlen, alg, ret);
  81. return ret;
  82. }
  83. EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
  84. int crypto_aead_decrypt(struct aead_request *req)
  85. {
  86. struct crypto_aead *aead = crypto_aead_reqtfm(req);
  87. struct crypto_alg *alg = aead->base.__crt_alg;
  88. unsigned int cryptlen = req->cryptlen;
  89. int ret;
  90. crypto_stats_get(alg);
  91. if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
  92. ret = -ENOKEY;
  93. else if (req->cryptlen < crypto_aead_authsize(aead))
  94. ret = -EINVAL;
  95. else
  96. ret = crypto_aead_alg(aead)->decrypt(req);
  97. crypto_stats_aead_decrypt(cryptlen, alg, ret);
  98. return ret;
  99. }
  100. EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
  101. static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
  102. {
  103. struct crypto_aead *aead = __crypto_aead_cast(tfm);
  104. struct aead_alg *alg = crypto_aead_alg(aead);
  105. alg->exit(aead);
  106. }
  107. static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
  108. {
  109. struct crypto_aead *aead = __crypto_aead_cast(tfm);
  110. struct aead_alg *alg = crypto_aead_alg(aead);
  111. crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
  112. aead->authsize = alg->maxauthsize;
  113. if (alg->exit)
  114. aead->base.exit = crypto_aead_exit_tfm;
  115. if (alg->init)
  116. return alg->init(aead);
  117. return 0;
  118. }
  119. #ifdef CONFIG_NET
  120. static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
  121. {
  122. struct crypto_report_aead raead;
  123. struct aead_alg *aead = container_of(alg, struct aead_alg, base);
  124. memset(&raead, 0, sizeof(raead));
  125. strscpy(raead.type, "aead", sizeof(raead.type));
  126. strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
  127. raead.blocksize = alg->cra_blocksize;
  128. raead.maxauthsize = aead->maxauthsize;
  129. raead.ivsize = aead->ivsize;
  130. return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
  131. }
  132. #else
  133. static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
  134. {
  135. return -ENOSYS;
  136. }
  137. #endif
  138. static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
  139. __maybe_unused;
  140. static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
  141. {
  142. struct aead_alg *aead = container_of(alg, struct aead_alg, base);
  143. seq_printf(m, "type : aead\n");
  144. seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
  145. "yes" : "no");
  146. seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
  147. seq_printf(m, "ivsize : %u\n", aead->ivsize);
  148. seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
  149. seq_printf(m, "geniv : <none>\n");
  150. }
  151. static void crypto_aead_free_instance(struct crypto_instance *inst)
  152. {
  153. struct aead_instance *aead = aead_instance(inst);
  154. aead->free(aead);
  155. }
  156. static const struct crypto_type crypto_aead_type = {
  157. .extsize = crypto_alg_extsize,
  158. .init_tfm = crypto_aead_init_tfm,
  159. .free = crypto_aead_free_instance,
  160. #ifdef CONFIG_PROC_FS
  161. .show = crypto_aead_show,
  162. #endif
  163. .report = crypto_aead_report,
  164. .maskclear = ~CRYPTO_ALG_TYPE_MASK,
  165. .maskset = CRYPTO_ALG_TYPE_MASK,
  166. .type = CRYPTO_ALG_TYPE_AEAD,
  167. .tfmsize = offsetof(struct crypto_aead, base),
  168. };
  169. int crypto_grab_aead(struct crypto_aead_spawn *spawn,
  170. struct crypto_instance *inst,
  171. const char *name, u32 type, u32 mask)
  172. {
  173. spawn->base.frontend = &crypto_aead_type;
  174. return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
  175. }
  176. EXPORT_SYMBOL_GPL(crypto_grab_aead);
  177. struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
  178. {
  179. return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
  180. }
  181. EXPORT_SYMBOL_GPL(crypto_alloc_aead);
  182. static int aead_prepare_alg(struct aead_alg *alg)
  183. {
  184. struct crypto_alg *base = &alg->base;
  185. if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
  186. PAGE_SIZE / 8)
  187. return -EINVAL;
  188. if (!alg->chunksize)
  189. alg->chunksize = base->cra_blocksize;
  190. base->cra_type = &crypto_aead_type;
  191. base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
  192. base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
  193. return 0;
  194. }
  195. int crypto_register_aead(struct aead_alg *alg)
  196. {
  197. struct crypto_alg *base = &alg->base;
  198. int err;
  199. err = aead_prepare_alg(alg);
  200. if (err)
  201. return err;
  202. return crypto_register_alg(base);
  203. }
  204. EXPORT_SYMBOL_GPL(crypto_register_aead);
  205. void crypto_unregister_aead(struct aead_alg *alg)
  206. {
  207. crypto_unregister_alg(&alg->base);
  208. }
  209. EXPORT_SYMBOL_GPL(crypto_unregister_aead);
  210. int crypto_register_aeads(struct aead_alg *algs, int count)
  211. {
  212. int i, ret;
  213. for (i = 0; i < count; i++) {
  214. ret = crypto_register_aead(&algs[i]);
  215. if (ret)
  216. goto err;
  217. }
  218. return 0;
  219. err:
  220. for (--i; i >= 0; --i)
  221. crypto_unregister_aead(&algs[i]);
  222. return ret;
  223. }
  224. EXPORT_SYMBOL_GPL(crypto_register_aeads);
  225. void crypto_unregister_aeads(struct aead_alg *algs, int count)
  226. {
  227. int i;
  228. for (i = count - 1; i >= 0; --i)
  229. crypto_unregister_aead(&algs[i]);
  230. }
  231. EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
  232. int aead_register_instance(struct crypto_template *tmpl,
  233. struct aead_instance *inst)
  234. {
  235. int err;
  236. if (WARN_ON(!inst->free))
  237. return -EINVAL;
  238. err = aead_prepare_alg(&inst->alg);
  239. if (err)
  240. return err;
  241. return crypto_register_instance(tmpl, aead_crypto_instance(inst));
  242. }
  243. EXPORT_SYMBOL_GPL(aead_register_instance);
  244. MODULE_LICENSE("GPL");
  245. MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");