LCOV - code coverage report
Current view: top level - crypto - aead.c (source / functions) Hit Total Coverage
Test: landlock.info Lines: 0 135 0.0 %
Date: 2021-04-22 12:43:58 Functions: 0 18 0.0 %

          Line data    Source code
       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             : 
      10             : #include <crypto/internal/aead.h>
      11             : #include <linux/errno.h>
      12             : #include <linux/init.h>
      13             : #include <linux/kernel.h>
      14             : #include <linux/module.h>
      15             : #include <linux/slab.h>
      16             : #include <linux/seq_file.h>
      17             : #include <linux/cryptouser.h>
      18             : #include <net/netlink.h>
      19             : 
      20             : #include "internal.h"
      21             : 
      22           0 : static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
      23             :                             unsigned int keylen)
      24             : {
      25           0 :         unsigned long alignmask = crypto_aead_alignmask(tfm);
      26           0 :         int ret;
      27           0 :         u8 *buffer, *alignbuffer;
      28           0 :         unsigned long absize;
      29             : 
      30           0 :         absize = keylen + alignmask;
      31           0 :         buffer = kmalloc(absize, GFP_ATOMIC);
      32           0 :         if (!buffer)
      33             :                 return -ENOMEM;
      34             : 
      35           0 :         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
      36           0 :         memcpy(alignbuffer, key, keylen);
      37           0 :         ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
      38           0 :         memset(alignbuffer, 0, keylen);
      39           0 :         kfree(buffer);
      40           0 :         return ret;
      41             : }
      42             : 
      43           0 : int crypto_aead_setkey(struct crypto_aead *tfm,
      44             :                        const u8 *key, unsigned int keylen)
      45             : {
      46           0 :         unsigned long alignmask = crypto_aead_alignmask(tfm);
      47           0 :         int err;
      48             : 
      49           0 :         if ((unsigned long)key & alignmask)
      50           0 :                 err = setkey_unaligned(tfm, key, keylen);
      51             :         else
      52           0 :                 err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
      53             : 
      54           0 :         if (unlikely(err)) {
      55           0 :                 crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
      56           0 :                 return err;
      57             :         }
      58             : 
      59           0 :         crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
      60           0 :         return 0;
      61             : }
      62             : EXPORT_SYMBOL_GPL(crypto_aead_setkey);
      63             : 
      64           0 : int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
      65             : {
      66           0 :         int err;
      67             : 
      68           0 :         if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
      69           0 :             authsize > crypto_aead_maxauthsize(tfm))
      70             :                 return -EINVAL;
      71             : 
      72           0 :         if (crypto_aead_alg(tfm)->setauthsize) {
      73           0 :                 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
      74           0 :                 if (err)
      75             :                         return err;
      76             :         }
      77             : 
      78           0 :         tfm->authsize = authsize;
      79           0 :         return 0;
      80             : }
      81             : EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
      82             : 
      83           0 : int crypto_aead_encrypt(struct aead_request *req)
      84             : {
      85           0 :         struct crypto_aead *aead = crypto_aead_reqtfm(req);
      86           0 :         struct crypto_alg *alg = aead->base.__crt_alg;
      87           0 :         unsigned int cryptlen = req->cryptlen;
      88           0 :         int ret;
      89             : 
      90           0 :         crypto_stats_get(alg);
      91           0 :         if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
      92             :                 ret = -ENOKEY;
      93             :         else
      94           0 :                 ret = crypto_aead_alg(aead)->encrypt(req);
      95           0 :         crypto_stats_aead_encrypt(cryptlen, alg, ret);
      96           0 :         return ret;
      97             : }
      98             : EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
      99             : 
     100           0 : int crypto_aead_decrypt(struct aead_request *req)
     101             : {
     102           0 :         struct crypto_aead *aead = crypto_aead_reqtfm(req);
     103           0 :         struct crypto_alg *alg = aead->base.__crt_alg;
     104           0 :         unsigned int cryptlen = req->cryptlen;
     105           0 :         int ret;
     106             : 
     107           0 :         crypto_stats_get(alg);
     108           0 :         if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
     109             :                 ret = -ENOKEY;
     110           0 :         else if (req->cryptlen < crypto_aead_authsize(aead))
     111             :                 ret = -EINVAL;
     112             :         else
     113           0 :                 ret = crypto_aead_alg(aead)->decrypt(req);
     114           0 :         crypto_stats_aead_decrypt(cryptlen, alg, ret);
     115           0 :         return ret;
     116             : }
     117             : EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
     118             : 
     119           0 : static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
     120             : {
     121           0 :         struct crypto_aead *aead = __crypto_aead_cast(tfm);
     122           0 :         struct aead_alg *alg = crypto_aead_alg(aead);
     123             : 
     124           0 :         alg->exit(aead);
     125           0 : }
     126             : 
     127           0 : static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
     128             : {
     129           0 :         struct crypto_aead *aead = __crypto_aead_cast(tfm);
     130           0 :         struct aead_alg *alg = crypto_aead_alg(aead);
     131             : 
     132           0 :         crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
     133             : 
     134           0 :         aead->authsize = alg->maxauthsize;
     135             : 
     136           0 :         if (alg->exit)
     137           0 :                 aead->base.exit = crypto_aead_exit_tfm;
     138             : 
     139           0 :         if (alg->init)
     140           0 :                 return alg->init(aead);
     141             : 
     142             :         return 0;
     143             : }
     144             : 
     145             : #ifdef CONFIG_NET
     146           0 : static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
     147             : {
     148           0 :         struct crypto_report_aead raead;
     149           0 :         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
     150             : 
     151           0 :         memset(&raead, 0, sizeof(raead));
     152             : 
     153           0 :         strscpy(raead.type, "aead", sizeof(raead.type));
     154           0 :         strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
     155             : 
     156           0 :         raead.blocksize = alg->cra_blocksize;
     157           0 :         raead.maxauthsize = aead->maxauthsize;
     158           0 :         raead.ivsize = aead->ivsize;
     159             : 
     160           0 :         return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
     161             : }
     162             : #else
     163             : static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
     164             : {
     165             :         return -ENOSYS;
     166             : }
     167             : #endif
     168             : 
     169             : static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
     170             :         __maybe_unused;
     171           0 : static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
     172             : {
     173           0 :         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
     174             : 
     175           0 :         seq_printf(m, "type         : aead\n");
     176           0 :         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
     177             :                                              "yes" : "no");
     178           0 :         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
     179           0 :         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
     180           0 :         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
     181           0 :         seq_printf(m, "geniv        : <none>\n");
     182           0 : }
     183             : 
     184           0 : static void crypto_aead_free_instance(struct crypto_instance *inst)
     185             : {
     186           0 :         struct aead_instance *aead = aead_instance(inst);
     187             : 
     188           0 :         aead->free(aead);
     189           0 : }
     190             : 
     191             : static const struct crypto_type crypto_aead_type = {
     192             :         .extsize = crypto_alg_extsize,
     193             :         .init_tfm = crypto_aead_init_tfm,
     194             :         .free = crypto_aead_free_instance,
     195             : #ifdef CONFIG_PROC_FS
     196             :         .show = crypto_aead_show,
     197             : #endif
     198             :         .report = crypto_aead_report,
     199             :         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
     200             :         .maskset = CRYPTO_ALG_TYPE_MASK,
     201             :         .type = CRYPTO_ALG_TYPE_AEAD,
     202             :         .tfmsize = offsetof(struct crypto_aead, base),
     203             : };
     204             : 
     205           0 : int crypto_grab_aead(struct crypto_aead_spawn *spawn,
     206             :                      struct crypto_instance *inst,
     207             :                      const char *name, u32 type, u32 mask)
     208             : {
     209           0 :         spawn->base.frontend = &crypto_aead_type;
     210           0 :         return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
     211             : }
     212             : EXPORT_SYMBOL_GPL(crypto_grab_aead);
     213             : 
     214           0 : struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
     215             : {
     216           0 :         return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
     217             : }
     218             : EXPORT_SYMBOL_GPL(crypto_alloc_aead);
     219             : 
     220           0 : static int aead_prepare_alg(struct aead_alg *alg)
     221             : {
     222           0 :         struct crypto_alg *base = &alg->base;
     223             : 
     224           0 :         if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
     225             :             PAGE_SIZE / 8)
     226             :                 return -EINVAL;
     227             : 
     228           0 :         if (!alg->chunksize)
     229           0 :                 alg->chunksize = base->cra_blocksize;
     230             : 
     231           0 :         base->cra_type = &crypto_aead_type;
     232           0 :         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
     233           0 :         base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
     234             : 
     235           0 :         return 0;
     236             : }
     237             : 
     238           0 : int crypto_register_aead(struct aead_alg *alg)
     239             : {
     240           0 :         struct crypto_alg *base = &alg->base;
     241           0 :         int err;
     242             : 
     243           0 :         err = aead_prepare_alg(alg);
     244           0 :         if (err)
     245             :                 return err;
     246             : 
     247           0 :         return crypto_register_alg(base);
     248             : }
     249             : EXPORT_SYMBOL_GPL(crypto_register_aead);
     250             : 
     251           0 : void crypto_unregister_aead(struct aead_alg *alg)
     252             : {
     253           0 :         crypto_unregister_alg(&alg->base);
     254           0 : }
     255             : EXPORT_SYMBOL_GPL(crypto_unregister_aead);
     256             : 
     257           0 : int crypto_register_aeads(struct aead_alg *algs, int count)
     258             : {
     259           0 :         int i, ret;
     260             : 
     261           0 :         for (i = 0; i < count; i++) {
     262           0 :                 ret = crypto_register_aead(&algs[i]);
     263           0 :                 if (ret)
     264           0 :                         goto err;
     265             :         }
     266             : 
     267             :         return 0;
     268             : 
     269           0 : err:
     270           0 :         for (--i; i >= 0; --i)
     271           0 :                 crypto_unregister_aead(&algs[i]);
     272             : 
     273             :         return ret;
     274             : }
     275             : EXPORT_SYMBOL_GPL(crypto_register_aeads);
     276             : 
     277           0 : void crypto_unregister_aeads(struct aead_alg *algs, int count)
     278             : {
     279           0 :         int i;
     280             : 
     281           0 :         for (i = count - 1; i >= 0; --i)
     282           0 :                 crypto_unregister_aead(&algs[i]);
     283           0 : }
     284             : EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
     285             : 
     286           0 : int aead_register_instance(struct crypto_template *tmpl,
     287             :                            struct aead_instance *inst)
     288             : {
     289           0 :         int err;
     290             : 
     291           0 :         if (WARN_ON(!inst->free))
     292             :                 return -EINVAL;
     293             : 
     294           0 :         err = aead_prepare_alg(&inst->alg);
     295           0 :         if (err)
     296             :                 return err;
     297             : 
     298           0 :         return crypto_register_instance(tmpl, aead_crypto_instance(inst));
     299             : }
     300             : EXPORT_SYMBOL_GPL(aead_register_instance);
     301             : 
     302             : MODULE_LICENSE("GPL");
     303             : MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");

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