Root/crypto/ablkcipher.c

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

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