ablkcipher.c

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    1 /*
    2  * Asynchronous block chaining cipher operations.
    3  *
    4  * This is the asynchronous version of blkcipher.c indicating completion
    5  * via a callback.
    6  *
    7  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
    8  *
    9  * This program is free software; you can redistribute it and/or modify it
   10  * under the terms of the GNU General Public License as published by the Free
   11  * Software Foundation; either version 2 of the License, or (at your option)
   12  * any later version.
   13  *
   14  */
   15 
   16 #include <crypto/internal/skcipher.h>
   17 #include <linux/cpumask.h>
   18 #include <linux/err.h>
   19 #include <linux/init.h>
   20 #include <linux/kernel.h>
   21 #include <linux/module.h>
   22 #include <linux/rtnetlink.h>
   23 #include <linux/sched.h>
   24 #include <linux/slab.h>
   25 #include <linux/seq_file.h>
   26 #include <linux/cryptouser.h>
   27 #include <net/netlink.h>
   28 
   29 #include <crypto/scatterwalk.h>
   30 
   31 #include "internal.h"
   32 
   33 static const char *skcipher_default_geniv __read_mostly;
   34 
   35 struct ablkcipher_buffer {
   36         struct list_head        entry;
   37         struct scatter_walk     dst;
   38         unsigned int            len;
   39         void                    *data;
   40 };
   41 
   42 enum {
   43         ABLKCIPHER_WALK_SLOW = 1 << 0,
   44 };
   45 
   46 static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
   47 {
   48         scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
   49 }
   50 
   51 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
   52 {
   53         struct ablkcipher_buffer *p, *tmp;
   54 
   55         list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
   56                 ablkcipher_buffer_write(p);
   57                 list_del(&p->entry);
   58                 kfree(p);
   59         }
   60 }
   61 EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
   62 
   63 static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
   64                                           struct ablkcipher_buffer *p)
   65 {
   66         p->dst = walk->out;
   67         list_add_tail(&p->entry, &walk->buffers);
   68 }
   69 
   70 /* Get a spot of the specified length that does not straddle a page.
   71  * The caller needs to ensure that there is enough space for this operation.
   72  */
   73 static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
   74 {
   75         u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
   76         return max(start, end_page);
   77 }
   78 
   79 static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
   80                                                 unsigned int bsize)
   81 {
   82         unsigned int n = bsize;
   83 
   84         for (;;) {
   85                 unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
   86 
   87                 if (len_this_page > n)
   88                         len_this_page = n;
   89                 scatterwalk_advance(&walk->out, n);
   90                 if (n == len_this_page)
   91                         break;
   92                 n -= len_this_page;
   93                 scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg));
   94         }
   95 
   96         return bsize;
   97 }
   98 
   99 static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
  100                                                 unsigned int n)
  101 {
  102         scatterwalk_advance(&walk->in, n);
  103         scatterwalk_advance(&walk->out, n);
  104 
  105         return n;
  106 }
  107 
  108 static int ablkcipher_walk_next(struct ablkcipher_request *req,
  109                                 struct ablkcipher_walk *walk);
  110 
  111 int ablkcipher_walk_done(struct ablkcipher_request *req,
  112                          struct ablkcipher_walk *walk, int err)
  113 {
  114         struct crypto_tfm *tfm = req->base.tfm;
  115         unsigned int nbytes = 0;
  116 
  117         if (likely(err >= 0)) {
  118                 unsigned int n = walk->nbytes - err;
  119 
  120                 if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
  121                         n = ablkcipher_done_fast(walk, n);
  122                 else if (WARN_ON(err)) {
  123                         err = -EINVAL;
  124                         goto err;
  125                 } else
  126                         n = ablkcipher_done_slow(walk, n);
  127 
  128                 nbytes = walk->total - n;
  129                 err = 0;
  130         }
  131 
  132         scatterwalk_done(&walk->in, 0, nbytes);
  133         scatterwalk_done(&walk->out, 1, nbytes);
  134 
  135 err:
  136         walk->total = nbytes;
  137         walk->nbytes = nbytes;
  138 
  139         if (nbytes) {
  140                 crypto_yield(req->base.flags);
  141                 return ablkcipher_walk_next(req, walk);
  142         }
  143 
  144         if (walk->iv != req->info)
  145                 memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
  146         kfree(walk->iv_buffer);
  147 
  148         return err;
  149 }
  150 EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
  151 
  152 static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
  153                                        struct ablkcipher_walk *walk,
  154                                        unsigned int bsize,
  155                                        unsigned int alignmask,
  156                                        void **src_p, void **dst_p)
  157 {
  158         unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
  159         struct ablkcipher_buffer *p;
  160         void *src, *dst, *base;
  161         unsigned int n;
  162 
  163         n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
  164         n += (aligned_bsize * 3 - (alignmask + 1) +
  165               (alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
  166 
  167         p = kmalloc(n, GFP_ATOMIC);
  168         if (!p)
  169                 return ablkcipher_walk_done(req, walk, -ENOMEM);
  170 
  171         base = p + 1;
  172 
  173         dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
  174         src = dst = ablkcipher_get_spot(dst, bsize);
  175 
  176         p->len = bsize;
  177         p->data = dst;
  178 
  179         scatterwalk_copychunks(src, &walk->in, bsize, 0);
  180 
  181         ablkcipher_queue_write(walk, p);
  182 
  183         walk->nbytes = bsize;
  184         walk->flags |= ABLKCIPHER_WALK_SLOW;
  185 
  186         *src_p = src;
  187         *dst_p = dst;
  188 
  189         return 0;
  190 }
  191 
  192 static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
  193                                      struct crypto_tfm *tfm,
  194                                      unsigned int alignmask)
  195 {
  196         unsigned bs = walk->blocksize;
  197         unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
  198         unsigned aligned_bs = ALIGN(bs, alignmask + 1);
  199         unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
  200                             (alignmask + 1);
  201         u8 *iv;
  202 
  203         size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
  204         walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
  205         if (!walk->iv_buffer)
  206                 return -ENOMEM;
  207 
  208         iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
  209         iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
  210         iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
  211         iv = ablkcipher_get_spot(iv, ivsize);
  212 
  213         walk->iv = memcpy(iv, walk->iv, ivsize);
  214         return 0;
  215 }
  216 
  217 static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
  218                                        struct ablkcipher_walk *walk)
  219 {
  220         walk->src.page = scatterwalk_page(&walk->in);
  221         walk->src.offset = offset_in_page(walk->in.offset);
  222         walk->dst.page = scatterwalk_page(&walk->out);
  223         walk->dst.offset = offset_in_page(walk->out.offset);
  224 
  225         return 0;
  226 }
  227 
  228 static int ablkcipher_walk_next(struct ablkcipher_request *req,
  229                                 struct ablkcipher_walk *walk)
  230 {
  231         struct crypto_tfm *tfm = req->base.tfm;
  232         unsigned int alignmask, bsize, n;
  233         void *src, *dst;
  234         int err;
  235 
  236         alignmask = crypto_tfm_alg_alignmask(tfm);
  237         n = walk->total;
  238         if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
  239                 req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
  240                 return ablkcipher_walk_done(req, walk, -EINVAL);
  241         }
  242 
  243         walk->flags &= ~ABLKCIPHER_WALK_SLOW;
  244         src = dst = NULL;
  245 
  246         bsize = min(walk->blocksize, n);
  247         n = scatterwalk_clamp(&walk->in, n);
  248         n = scatterwalk_clamp(&walk->out, n);
  249 
  250         if (n < bsize ||
  251             !scatterwalk_aligned(&walk->in, alignmask) ||
  252             !scatterwalk_aligned(&walk->out, alignmask)) {
  253                 err = ablkcipher_next_slow(req, walk, bsize, alignmask,
  254                                            &src, &dst);
  255                 goto set_phys_lowmem;
  256         }
  257 
  258         walk->nbytes = n;
  259 
  260         return ablkcipher_next_fast(req, walk);
  261 
  262 set_phys_lowmem:
  263         if (err >= 0) {
  264                 walk->src.page = virt_to_page(src);
  265                 walk->dst.page = virt_to_page(dst);
  266                 walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
  267                 walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
  268         }
  269 
  270         return err;
  271 }
  272 
  273 static int ablkcipher_walk_first(struct ablkcipher_request *req,
  274                                  struct ablkcipher_walk *walk)
  275 {
  276         struct crypto_tfm *tfm = req->base.tfm;
  277         unsigned int alignmask;
  278 
  279         alignmask = crypto_tfm_alg_alignmask(tfm);
  280         if (WARN_ON_ONCE(in_irq()))
  281                 return -EDEADLK;
  282 
  283         walk->nbytes = walk->total;
  284         if (unlikely(!walk->total))
  285                 return 0;
  286 
  287         walk->iv_buffer = NULL;
  288         walk->iv = req->info;
  289         if (unlikely(((unsigned long)walk->iv & alignmask))) {
  290                 int err = ablkcipher_copy_iv(walk, tfm, alignmask);
  291                 if (err)
  292                         return err;
  293         }
  294 
  295         scatterwalk_start(&walk->in, walk->in.sg);
  296         scatterwalk_start(&walk->out, walk->out.sg);
  297 
  298         return ablkcipher_walk_next(req, walk);
  299 }
  300 
  301 int ablkcipher_walk_phys(struct ablkcipher_request *req,
  302                          struct ablkcipher_walk *walk)
  303 {
  304         walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
  305         return ablkcipher_walk_first(req, walk);
  306 }
  307 EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
  308 
  309 static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
  310                             unsigned int keylen)
  311 {
  312         struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
  313         unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
  314         int ret;
  315         u8 *buffer, *alignbuffer;
  316         unsigned long absize;
  317 
  318         absize = keylen + alignmask;
  319         buffer = kmalloc(absize, GFP_ATOMIC);
  320         if (!buffer)
  321                 return -ENOMEM;
  322 
  323         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
  324         memcpy(alignbuffer, key, keylen);
  325         ret = cipher->setkey(tfm, alignbuffer, keylen);
  326         memset(alignbuffer, 0, keylen);
  327         kfree(buffer);
  328         return ret;
  329 }
  330 
  331 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
  332                   unsigned int keylen)
  333 {
  334         struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
  335         unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
  336 
  337         if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
  338                 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
  339                 return -EINVAL;
  340         }
  341 
  342         if ((unsigned long)key & alignmask)
  343                 return setkey_unaligned(tfm, key, keylen);
  344 
  345         return cipher->setkey(tfm, key, keylen);
  346 }
  347 
  348 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
  349                                               u32 mask)
  350 {
  351         return alg->cra_ctxsize;
  352 }
  353 
  354 int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
  355 {
  356         return crypto_ablkcipher_encrypt(&req->creq);
  357 }
  358 
  359 int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
  360 {
  361         return crypto_ablkcipher_decrypt(&req->creq);
  362 }
  363 
  364 static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
  365                                       u32 mask)
  366 {
  367         struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
  368         struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
  369 
  370         if (alg->ivsize > PAGE_SIZE / 8)
  371                 return -EINVAL;
  372 
  373         crt->setkey = setkey;
  374         crt->encrypt = alg->encrypt;
  375         crt->decrypt = alg->decrypt;
  376         if (!alg->ivsize) {
  377                 crt->givencrypt = skcipher_null_givencrypt;
  378                 crt->givdecrypt = skcipher_null_givdecrypt;
  379         }
  380         crt->base = __crypto_ablkcipher_cast(tfm);
  381         crt->ivsize = alg->ivsize;
  382 
  383         return 0;
  384 }
  385 
  386 #ifdef CONFIG_NET
  387 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  388 {
  389         struct crypto_report_blkcipher rblkcipher;
  390 
  391         snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "ablkcipher");
  392         snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s",
  393                  alg->cra_ablkcipher.geniv ?: "<default>");
  394 
  395         rblkcipher.blocksize = alg->cra_blocksize;
  396         rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
  397         rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
  398         rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
  399 
  400         if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
  401                     sizeof(struct crypto_report_blkcipher), &rblkcipher))
  402                 goto nla_put_failure;
  403         return 0;
  404 
  405 nla_put_failure:
  406         return -EMSGSIZE;
  407 }
  408 #else
  409 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  410 {
  411         return -ENOSYS;
  412 }
  413 #endif
  414 
  415 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
  416         __attribute__ ((unused));
  417 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
  418 {
  419         struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
  420 
  421         seq_printf(m, "type         : ablkcipher\n");
  422         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
  423                                              "yes" : "no");
  424         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  425         seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
  426         seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
  427         seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
  428         seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<default>");
  429 }
  430 
  431 const struct crypto_type crypto_ablkcipher_type = {
  432         .ctxsize = crypto_ablkcipher_ctxsize,
  433         .init = crypto_init_ablkcipher_ops,
  434 #ifdef CONFIG_PROC_FS
  435         .show = crypto_ablkcipher_show,
  436 #endif
  437         .report = crypto_ablkcipher_report,
  438 };
  439 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
  440 
  441 static int no_givdecrypt(struct skcipher_givcrypt_request *req)
  442 {
  443         return -ENOSYS;
  444 }
  445 
  446 static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
  447                                       u32 mask)
  448 {
  449         struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
  450         struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
  451 
  452         if (alg->ivsize > PAGE_SIZE / 8)
  453                 return -EINVAL;
  454 
  455         crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
  456                       alg->setkey : setkey;
  457         crt->encrypt = alg->encrypt;
  458         crt->decrypt = alg->decrypt;
  459         crt->givencrypt = alg->givencrypt;
  460         crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
  461         crt->base = __crypto_ablkcipher_cast(tfm);
  462         crt->ivsize = alg->ivsize;
  463 
  464         return 0;
  465 }
  466 
  467 #ifdef CONFIG_NET
  468 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  469 {
  470         struct crypto_report_blkcipher rblkcipher;
  471 
  472         snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "givcipher");
  473         snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s",
  474                  alg->cra_ablkcipher.geniv ?: "<built-in>");
  475 
  476         rblkcipher.blocksize = alg->cra_blocksize;
  477         rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
  478         rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
  479         rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
  480 
  481         if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
  482                     sizeof(struct crypto_report_blkcipher), &rblkcipher))
  483                 goto nla_put_failure;
  484         return 0;
  485 
  486 nla_put_failure:
  487         return -EMSGSIZE;
  488 }
  489 #else
  490 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
  491 {
  492         return -ENOSYS;
  493 }
  494 #endif
  495 
  496 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
  497         __attribute__ ((unused));
  498 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
  499 {
  500         struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
  501 
  502         seq_printf(m, "type         : givcipher\n");
  503         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
  504                                              "yes" : "no");
  505         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  506         seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
  507         seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
  508         seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
  509         seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<built-in>");
  510 }
  511 
  512 const struct crypto_type crypto_givcipher_type = {
  513         .ctxsize = crypto_ablkcipher_ctxsize,
  514         .init = crypto_init_givcipher_ops,
  515 #ifdef CONFIG_PROC_FS
  516         .show = crypto_givcipher_show,
  517 #endif
  518         .report = crypto_givcipher_report,
  519 };
  520 EXPORT_SYMBOL_GPL(crypto_givcipher_type);
  521 
  522 const char *crypto_default_geniv(const struct crypto_alg *alg)
  523 {
  524         if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  525              CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
  526                                          alg->cra_ablkcipher.ivsize) !=
  527             alg->cra_blocksize)
  528                 return "chainiv";
  529 
  530         return alg->cra_flags & CRYPTO_ALG_ASYNC ?
  531                "eseqiv" : skcipher_default_geniv;
  532 }
  533 
  534 static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
  535 {
  536         struct rtattr *tb[3];
  537         struct {
  538                 struct rtattr attr;
  539                 struct crypto_attr_type data;
  540         } ptype;
  541         struct {
  542                 struct rtattr attr;
  543                 struct crypto_attr_alg data;
  544         } palg;
  545         struct crypto_template *tmpl;
  546         struct crypto_instance *inst;
  547         struct crypto_alg *larval;
  548         const char *geniv;
  549         int err;
  550 
  551         larval = crypto_larval_lookup(alg->cra_driver_name,
  552                                       (type & ~CRYPTO_ALG_TYPE_MASK) |
  553                                       CRYPTO_ALG_TYPE_GIVCIPHER,
  554                                       mask | CRYPTO_ALG_TYPE_MASK);
  555         err = PTR_ERR(larval);
  556         if (IS_ERR(larval))
  557                 goto out;
  558 
  559         err = -EAGAIN;
  560         if (!crypto_is_larval(larval))
  561                 goto drop_larval;
  562 
  563         ptype.attr.rta_len = sizeof(ptype);
  564         ptype.attr.rta_type = CRYPTOA_TYPE;
  565         ptype.data.type = type | CRYPTO_ALG_GENIV;
  566         /* GENIV tells the template that we're making a default geniv. */
  567         ptype.data.mask = mask | CRYPTO_ALG_GENIV;
  568         tb[0] = &ptype.attr;
  569 
  570         palg.attr.rta_len = sizeof(palg);
  571         palg.attr.rta_type = CRYPTOA_ALG;
  572         /* Must use the exact name to locate ourselves. */
  573         memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
  574         tb[1] = &palg.attr;
  575 
  576         tb[2] = NULL;
  577 
  578         if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  579             CRYPTO_ALG_TYPE_BLKCIPHER)
  580                 geniv = alg->cra_blkcipher.geniv;
  581         else
  582                 geniv = alg->cra_ablkcipher.geniv;
  583 
  584         if (!geniv)
  585                 geniv = crypto_default_geniv(alg);
  586 
  587         tmpl = crypto_lookup_template(geniv);
  588         err = -ENOENT;
  589         if (!tmpl)
  590                 goto kill_larval;
  591 
  592         inst = tmpl->alloc(tb);
  593         err = PTR_ERR(inst);
  594         if (IS_ERR(inst))
  595                 goto put_tmpl;
  596 
  597         if ((err = crypto_register_instance(tmpl, inst))) {
  598                 tmpl->free(inst);
  599                 goto put_tmpl;
  600         }
  601 
  602         /* Redo the lookup to use the instance we just registered. */
  603         err = -EAGAIN;
  604 
  605 put_tmpl:
  606         crypto_tmpl_put(tmpl);
  607 kill_larval:
  608         crypto_larval_kill(larval);
  609 drop_larval:
  610         crypto_mod_put(larval);
  611 out:
  612         crypto_mod_put(alg);
  613         return err;
  614 }
  615 
  616 struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask)
  617 {
  618         struct crypto_alg *alg;
  619 
  620         alg = crypto_alg_mod_lookup(name, type, mask);
  621         if (IS_ERR(alg))
  622                 return alg;
  623 
  624         if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  625             CRYPTO_ALG_TYPE_GIVCIPHER)
  626                 return alg;
  627 
  628         if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  629               CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
  630                                           alg->cra_ablkcipher.ivsize))
  631                 return alg;
  632 
  633         crypto_mod_put(alg);
  634         alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
  635                                     mask & ~CRYPTO_ALG_TESTED);
  636         if (IS_ERR(alg))
  637                 return alg;
  638 
  639         if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  640             CRYPTO_ALG_TYPE_GIVCIPHER) {
  641                 if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
  642                         crypto_mod_put(alg);
  643                         alg = ERR_PTR(-ENOENT);
  644                 }
  645                 return alg;
  646         }
  647 
  648         BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  649                  CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
  650                                              alg->cra_ablkcipher.ivsize));
  651 
  652         return ERR_PTR(crypto_givcipher_default(alg, type, mask));
  653 }
  654 EXPORT_SYMBOL_GPL(crypto_lookup_skcipher);
  655 
  656 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
  657                          u32 type, u32 mask)
  658 {
  659         struct crypto_alg *alg;
  660         int err;
  661 
  662         type = crypto_skcipher_type(type);
  663         mask = crypto_skcipher_mask(mask);
  664 
  665         alg = crypto_lookup_skcipher(name, type, mask);
  666         if (IS_ERR(alg))
  667                 return PTR_ERR(alg);
  668 
  669         err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
  670         crypto_mod_put(alg);
  671         return err;
  672 }
  673 EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
  674 
  675 struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
  676                                                   u32 type, u32 mask)
  677 {
  678         struct crypto_tfm *tfm;
  679         int err;
  680 
  681         type = crypto_skcipher_type(type);
  682         mask = crypto_skcipher_mask(mask);
  683 
  684         for (;;) {
  685                 struct crypto_alg *alg;
  686 
  687                 alg = crypto_lookup_skcipher(alg_name, type, mask);
  688                 if (IS_ERR(alg)) {
  689                         err = PTR_ERR(alg);
  690                         goto err;
  691                 }
  692 
  693                 tfm = __crypto_alloc_tfm(alg, type, mask);
  694                 if (!IS_ERR(tfm))
  695                         return __crypto_ablkcipher_cast(tfm);
  696 
  697                 crypto_mod_put(alg);
  698                 err = PTR_ERR(tfm);
  699 
  700 err:
  701                 if (err != -EAGAIN)
  702                         break;
  703                 if (signal_pending(current)) {
  704                         err = -EINTR;
  705                         break;
  706                 }
  707         }
  708 
  709         return ERR_PTR(err);
  710 }
  711 EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
  712 
  713 static int __init skcipher_module_init(void)
  714 {
  715         skcipher_default_geniv = num_possible_cpus() > 1 ?
  716                                  "eseqiv" : "chainiv";
  717         return 0;
  718 }
  719 
  720 static void skcipher_module_exit(void)
  721 {
  722 }
  723 
  724 module_init(skcipher_module_init);
  725 module_exit(skcipher_module_exit);
Cache object: ddc64fe8f5fcf6736cb6e7ab5051c92b
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FreeBSD/Linux Kernel Cross Reference sys/crypto/ablkcipher.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/ablkcipher.c
