Root/crypto/blkcipher.c

1/*
2 * Block chaining cipher operations.
3 *
4 * Generic encrypt/decrypt wrapper for ciphers, handles operations across
5 * multiple page boundaries by using temporary blocks. In user context,
6 * the kernel is given a chance to schedule us once per page.
7 *
8 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
13 * any later version.
14 *
15 */
16
17#include <crypto/internal/skcipher.h>
18#include <crypto/scatterwalk.h>
19#include <linux/errno.h>
20#include <linux/hardirq.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/scatterlist.h>
24#include <linux/seq_file.h>
25#include <linux/slab.h>
26#include <linux/string.h>
27
28#include "internal.h"
29
30enum {
31    BLKCIPHER_WALK_PHYS = 1 << 0,
32    BLKCIPHER_WALK_SLOW = 1 << 1,
33    BLKCIPHER_WALK_COPY = 1 << 2,
34    BLKCIPHER_WALK_DIFF = 1 << 3,
35};
36
37static int blkcipher_walk_next(struct blkcipher_desc *desc,
38                   struct blkcipher_walk *walk);
39static int blkcipher_walk_first(struct blkcipher_desc *desc,
40                struct blkcipher_walk *walk);
41
42static inline void blkcipher_map_src(struct blkcipher_walk *walk)
43{
44    walk->src.virt.addr = scatterwalk_map(&walk->in, 0);
45}
46
47static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
48{
49    walk->dst.virt.addr = scatterwalk_map(&walk->out, 1);
50}
51
52static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
53{
54    scatterwalk_unmap(walk->src.virt.addr, 0);
55}
56
57static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
58{
59    scatterwalk_unmap(walk->dst.virt.addr, 1);
60}
61
62/* Get a spot of the specified length that does not straddle a page.
63 * The caller needs to ensure that there is enough space for this operation.
64 */
65static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len)
66{
67    u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
68    return max(start, end_page);
69}
70
71static inline unsigned int blkcipher_done_slow(struct crypto_blkcipher *tfm,
72                           struct blkcipher_walk *walk,
73                           unsigned int bsize)
74{
75    u8 *addr;
76    unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
77
78    addr = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
79    addr = blkcipher_get_spot(addr, bsize);
80    scatterwalk_copychunks(addr, &walk->out, bsize, 1);
81    return bsize;
82}
83
84static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
85                           unsigned int n)
86{
87    if (walk->flags & BLKCIPHER_WALK_COPY) {
88        blkcipher_map_dst(walk);
89        memcpy(walk->dst.virt.addr, walk->page, n);
90        blkcipher_unmap_dst(walk);
91    } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
92        if (walk->flags & BLKCIPHER_WALK_DIFF)
93            blkcipher_unmap_dst(walk);
94        blkcipher_unmap_src(walk);
95    }
96
97    scatterwalk_advance(&walk->in, n);
98    scatterwalk_advance(&walk->out, n);
99
100    return n;
101}
102
103int blkcipher_walk_done(struct blkcipher_desc *desc,
104            struct blkcipher_walk *walk, int err)
105{
106    struct crypto_blkcipher *tfm = desc->tfm;
107    unsigned int nbytes = 0;
108
109    if (likely(err >= 0)) {
110        unsigned int n = walk->nbytes - err;
111
112        if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
113            n = blkcipher_done_fast(walk, n);
114        else if (WARN_ON(err)) {
115            err = -EINVAL;
116            goto err;
117        } else
118            n = blkcipher_done_slow(tfm, walk, n);
119
120        nbytes = walk->total - n;
121        err = 0;
122    }
123
124    scatterwalk_done(&walk->in, 0, nbytes);
125    scatterwalk_done(&walk->out, 1, nbytes);
126
127err:
128    walk->total = nbytes;
129    walk->nbytes = nbytes;
130
131    if (nbytes) {
132        crypto_yield(desc->flags);
133        return blkcipher_walk_next(desc, walk);
134    }
135
136    if (walk->iv != desc->info)
137        memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm));
138    if (walk->buffer != walk->page)
139        kfree(walk->buffer);
140    if (walk->page)
141        free_page((unsigned long)walk->page);
142
143    return err;
144}
145EXPORT_SYMBOL_GPL(blkcipher_walk_done);
146
147static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
148                      struct blkcipher_walk *walk,
149                      unsigned int bsize,
150                      unsigned int alignmask)
151{
152    unsigned int n;
153    unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
154
155    if (walk->buffer)
156        goto ok;
157
158    walk->buffer = walk->page;
159    if (walk->buffer)
160        goto ok;
161
162    n = aligned_bsize * 3 - (alignmask + 1) +
163        (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
164    walk->buffer = kmalloc(n, GFP_ATOMIC);
165    if (!walk->buffer)
166        return blkcipher_walk_done(desc, walk, -ENOMEM);
167
168ok:
169    walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
170                      alignmask + 1);
171    walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
172    walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
173                         aligned_bsize, bsize);
174
175    scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
176
177    walk->nbytes = bsize;
178    walk->flags |= BLKCIPHER_WALK_SLOW;
179
180    return 0;
181}
182
183static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
184{
185    u8 *tmp = walk->page;
186
187    blkcipher_map_src(walk);
188    memcpy(tmp, walk->src.virt.addr, walk->nbytes);
189    blkcipher_unmap_src(walk);
190
191    walk->src.virt.addr = tmp;
192    walk->dst.virt.addr = tmp;
193
194    return 0;
195}
196
197static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
198                      struct blkcipher_walk *walk)
199{
200    unsigned long diff;
201
202    walk->src.phys.page = scatterwalk_page(&walk->in);
203    walk->src.phys.offset = offset_in_page(walk->in.offset);
204    walk->dst.phys.page = scatterwalk_page(&walk->out);
205    walk->dst.phys.offset = offset_in_page(walk->out.offset);
206
207    if (walk->flags & BLKCIPHER_WALK_PHYS)
208        return 0;
209
210    diff = walk->src.phys.offset - walk->dst.phys.offset;
211    diff |= walk->src.virt.page - walk->dst.virt.page;
212
213    blkcipher_map_src(walk);
214    walk->dst.virt.addr = walk->src.virt.addr;
215
216    if (diff) {
217        walk->flags |= BLKCIPHER_WALK_DIFF;
218        blkcipher_map_dst(walk);
219    }
220
221    return 0;
222}
223
224static int blkcipher_walk_next(struct blkcipher_desc *desc,
225                   struct blkcipher_walk *walk)
226{
227    struct crypto_blkcipher *tfm = desc->tfm;
228    unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
229    unsigned int bsize;
230    unsigned int n;
231    int err;
232
233    n = walk->total;
234    if (unlikely(n < crypto_blkcipher_blocksize(tfm))) {
235        desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
236        return blkcipher_walk_done(desc, walk, -EINVAL);
237    }
238
239    walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
240             BLKCIPHER_WALK_DIFF);
241    if (!scatterwalk_aligned(&walk->in, alignmask) ||
242        !scatterwalk_aligned(&walk->out, alignmask)) {
243        walk->flags |= BLKCIPHER_WALK_COPY;
244        if (!walk->page) {
245            walk->page = (void *)__get_free_page(GFP_ATOMIC);
246            if (!walk->page)
247                n = 0;
248        }
249    }
250
251    bsize = min(walk->blocksize, n);
252    n = scatterwalk_clamp(&walk->in, n);
253    n = scatterwalk_clamp(&walk->out, n);
254
255    if (unlikely(n < bsize)) {
256        err = blkcipher_next_slow(desc, walk, bsize, alignmask);
257        goto set_phys_lowmem;
258    }
259
260    walk->nbytes = n;
261    if (walk->flags & BLKCIPHER_WALK_COPY) {
262        err = blkcipher_next_copy(walk);
263        goto set_phys_lowmem;
264    }
265
266    return blkcipher_next_fast(desc, walk);
267
268set_phys_lowmem:
269    if (walk->flags & BLKCIPHER_WALK_PHYS) {
270        walk->src.phys.page = virt_to_page(walk->src.virt.addr);
271        walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
272        walk->src.phys.offset &= PAGE_SIZE - 1;
273        walk->dst.phys.offset &= PAGE_SIZE - 1;
274    }
275    return err;
276}
277
278static inline int blkcipher_copy_iv(struct blkcipher_walk *walk,
279                    struct crypto_blkcipher *tfm,
280                    unsigned int alignmask)
281{
282    unsigned bs = walk->blocksize;
283    unsigned int ivsize = crypto_blkcipher_ivsize(tfm);
284    unsigned aligned_bs = ALIGN(bs, alignmask + 1);
285    unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
286                (alignmask + 1);
287    u8 *iv;
288
289    size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
290    walk->buffer = kmalloc(size, GFP_ATOMIC);
291    if (!walk->buffer)
292        return -ENOMEM;
293
294    iv = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
295    iv = blkcipher_get_spot(iv, bs) + aligned_bs;
296    iv = blkcipher_get_spot(iv, bs) + aligned_bs;
297    iv = blkcipher_get_spot(iv, ivsize);
298
299    walk->iv = memcpy(iv, walk->iv, ivsize);
300    return 0;
301}
302
303int blkcipher_walk_virt(struct blkcipher_desc *desc,
304            struct blkcipher_walk *walk)
305{
306    walk->flags &= ~BLKCIPHER_WALK_PHYS;
307    walk->blocksize = crypto_blkcipher_blocksize(desc->tfm);
308    return blkcipher_walk_first(desc, walk);
309}
310EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
311
312int blkcipher_walk_phys(struct blkcipher_desc *desc,
313            struct blkcipher_walk *walk)
314{
315    walk->flags |= BLKCIPHER_WALK_PHYS;
316    walk->blocksize = crypto_blkcipher_blocksize(desc->tfm);
317    return blkcipher_walk_first(desc, walk);
318}
319EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
320
321static int blkcipher_walk_first(struct blkcipher_desc *desc,
322                struct blkcipher_walk *walk)
323{
324    struct crypto_blkcipher *tfm = desc->tfm;
325    unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
326
327    if (WARN_ON_ONCE(in_irq()))
328        return -EDEADLK;
329
330    walk->nbytes = walk->total;
331    if (unlikely(!walk->total))
332        return 0;
333
334    walk->buffer = NULL;
335    walk->iv = desc->info;
336    if (unlikely(((unsigned long)walk->iv & alignmask))) {
337        int err = blkcipher_copy_iv(walk, tfm, alignmask);
338        if (err)
339            return err;
340    }
341
342    scatterwalk_start(&walk->in, walk->in.sg);
343    scatterwalk_start(&walk->out, walk->out.sg);
344    walk->page = NULL;
345
346    return blkcipher_walk_next(desc, walk);
347}
348
349int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
350                  struct blkcipher_walk *walk,
351                  unsigned int blocksize)
352{
353    walk->flags &= ~BLKCIPHER_WALK_PHYS;
354    walk->blocksize = blocksize;
355    return blkcipher_walk_first(desc, walk);
356}
357EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
358
359static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
360                unsigned int keylen)
361{
362    struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
363    unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
364    int ret;
365    u8 *buffer, *alignbuffer;
366    unsigned long absize;
367
368    absize = keylen + alignmask;
369    buffer = kmalloc(absize, GFP_ATOMIC);
370    if (!buffer)
371        return -ENOMEM;
372
373    alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
374    memcpy(alignbuffer, key, keylen);
375    ret = cipher->setkey(tfm, alignbuffer, keylen);
376    memset(alignbuffer, 0, keylen);
377    kfree(buffer);
378    return ret;
379}
380
381static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
382{
383    struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
384    unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
385
386    if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
387        tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
388        return -EINVAL;
389    }
390
391    if ((unsigned long)key & alignmask)
392        return setkey_unaligned(tfm, key, keylen);
393
394    return cipher->setkey(tfm, key, keylen);
395}
396
397static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
398            unsigned int keylen)
399{
400    return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
401}
402
403static int async_encrypt(struct ablkcipher_request *req)
404{
405    struct crypto_tfm *tfm = req->base.tfm;
406    struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
407    struct blkcipher_desc desc = {
408        .tfm = __crypto_blkcipher_cast(tfm),
409        .info = req->info,
410        .flags = req->base.flags,
411    };
412
413
414    return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
415}
416
417static int async_decrypt(struct ablkcipher_request *req)
418{
419    struct crypto_tfm *tfm = req->base.tfm;
420    struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
421    struct blkcipher_desc desc = {
422        .tfm = __crypto_blkcipher_cast(tfm),
423        .info = req->info,
424        .flags = req->base.flags,
425    };
426
427    return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
428}
429
430static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
431                         u32 mask)
432{
433    struct blkcipher_alg *cipher = &alg->cra_blkcipher;
434    unsigned int len = alg->cra_ctxsize;
435
436    if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
437        cipher->ivsize) {
438        len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
439        len += cipher->ivsize;
440    }
441
442    return len;
443}
444
445static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
446{
447    struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
448    struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
449
450    crt->setkey = async_setkey;
451    crt->encrypt = async_encrypt;
452    crt->decrypt = async_decrypt;
453    if (!alg->ivsize) {
454        crt->givencrypt = skcipher_null_givencrypt;
455        crt->givdecrypt = skcipher_null_givdecrypt;
456    }
457    crt->base = __crypto_ablkcipher_cast(tfm);
458    crt->ivsize = alg->ivsize;
459
460    return 0;
461}
462
463static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
464{
465    struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
466    struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
467    unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
468    unsigned long addr;
469
470    crt->setkey = setkey;
471    crt->encrypt = alg->encrypt;
472    crt->decrypt = alg->decrypt;
473
474    addr = (unsigned long)crypto_tfm_ctx(tfm);
475    addr = ALIGN(addr, align);
476    addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
477    crt->iv = (void *)addr;
478
479    return 0;
480}
481
482static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
483{
484    struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
485
486    if (alg->ivsize > PAGE_SIZE / 8)
487        return -EINVAL;
488
489    if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
490        return crypto_init_blkcipher_ops_sync(tfm);
491    else
492        return crypto_init_blkcipher_ops_async(tfm);
493}
494
495static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
496    __attribute__ ((unused));
497static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
498{
499    seq_printf(m, "type : blkcipher\n");
500    seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
501    seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
502    seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
503    seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
504    seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
505                         "<default>");
506}
507
508const struct crypto_type crypto_blkcipher_type = {
509    .ctxsize = crypto_blkcipher_ctxsize,
510    .init = crypto_init_blkcipher_ops,
511#ifdef CONFIG_PROC_FS
512    .show = crypto_blkcipher_show,
513#endif
514};
515EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
516
517static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn,
518                const char *name, u32 type, u32 mask)
519{
520    struct crypto_alg *alg;
521    int err;
522
523    type = crypto_skcipher_type(type);
524    mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV;
525
526    alg = crypto_alg_mod_lookup(name, type, mask);
527    if (IS_ERR(alg))
528        return PTR_ERR(alg);
529
530    err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
531    crypto_mod_put(alg);
532    return err;
533}
534
535struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
536                         struct rtattr **tb, u32 type,
537                         u32 mask)
538{
539    struct {
540        int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
541                  unsigned int keylen);
542        int (*encrypt)(struct ablkcipher_request *req);
543        int (*decrypt)(struct ablkcipher_request *req);
544
545        unsigned int min_keysize;
546        unsigned int max_keysize;
547        unsigned int ivsize;
548
549        const char *geniv;
550    } balg;
551    const char *name;
552    struct crypto_skcipher_spawn *spawn;
553    struct crypto_attr_type *algt;
554    struct crypto_instance *inst;
555    struct crypto_alg *alg;
556    int err;
557
558    algt = crypto_get_attr_type(tb);
559    err = PTR_ERR(algt);
560    if (IS_ERR(algt))
561        return ERR_PTR(err);
562
563    if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) &
564        algt->mask)
565        return ERR_PTR(-EINVAL);
566
567    name = crypto_attr_alg_name(tb[1]);
568    err = PTR_ERR(name);
569    if (IS_ERR(name))
570        return ERR_PTR(err);
571
572    inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
573    if (!inst)
574        return ERR_PTR(-ENOMEM);
575
576    spawn = crypto_instance_ctx(inst);
577
578    /* Ignore async algorithms if necessary. */
579    mask |= crypto_requires_sync(algt->type, algt->mask);
580
581    crypto_set_skcipher_spawn(spawn, inst);
582    err = crypto_grab_nivcipher(spawn, name, type, mask);
583    if (err)
584        goto err_free_inst;
585
586    alg = crypto_skcipher_spawn_alg(spawn);
587
588    if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
589        CRYPTO_ALG_TYPE_BLKCIPHER) {
590        balg.ivsize = alg->cra_blkcipher.ivsize;
591        balg.min_keysize = alg->cra_blkcipher.min_keysize;
592        balg.max_keysize = alg->cra_blkcipher.max_keysize;
593
594        balg.setkey = async_setkey;
595        balg.encrypt = async_encrypt;
596        balg.decrypt = async_decrypt;
597
598        balg.geniv = alg->cra_blkcipher.geniv;
599    } else {
600        balg.ivsize = alg->cra_ablkcipher.ivsize;
601        balg.min_keysize = alg->cra_ablkcipher.min_keysize;
602        balg.max_keysize = alg->cra_ablkcipher.max_keysize;
603
604        balg.setkey = alg->cra_ablkcipher.setkey;
605        balg.encrypt = alg->cra_ablkcipher.encrypt;
606        balg.decrypt = alg->cra_ablkcipher.decrypt;
607
608        balg.geniv = alg->cra_ablkcipher.geniv;
609    }
610
611    err = -EINVAL;
612    if (!balg.ivsize)
613        goto err_drop_alg;
614
615    /*
616     * This is only true if we're constructing an algorithm with its
617     * default IV generator. For the default generator we elide the
618     * template name and double-check the IV generator.
619     */
620    if (algt->mask & CRYPTO_ALG_GENIV) {
621        if (!balg.geniv)
622            balg.geniv = crypto_default_geniv(alg);
623        err = -EAGAIN;
624        if (strcmp(tmpl->name, balg.geniv))
625            goto err_drop_alg;
626
627        memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
628        memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
629               CRYPTO_MAX_ALG_NAME);
630    } else {
631        err = -ENAMETOOLONG;
632        if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
633                 "%s(%s)", tmpl->name, alg->cra_name) >=
634            CRYPTO_MAX_ALG_NAME)
635            goto err_drop_alg;
636        if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
637                 "%s(%s)", tmpl->name, alg->cra_driver_name) >=
638            CRYPTO_MAX_ALG_NAME)
639            goto err_drop_alg;
640    }
641
642    inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV;
643    inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
644    inst->alg.cra_priority = alg->cra_priority;
645    inst->alg.cra_blocksize = alg->cra_blocksize;
646    inst->alg.cra_alignmask = alg->cra_alignmask;
647    inst->alg.cra_type = &crypto_givcipher_type;
648
649    inst->alg.cra_ablkcipher.ivsize = balg.ivsize;
650    inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize;
651    inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize;
652    inst->alg.cra_ablkcipher.geniv = balg.geniv;
653
654    inst->alg.cra_ablkcipher.setkey = balg.setkey;
655    inst->alg.cra_ablkcipher.encrypt = balg.encrypt;
656    inst->alg.cra_ablkcipher.decrypt = balg.decrypt;
657
658out:
659    return inst;
660
661err_drop_alg:
662    crypto_drop_skcipher(spawn);
663err_free_inst:
664    kfree(inst);
665    inst = ERR_PTR(err);
666    goto out;
667}
668EXPORT_SYMBOL_GPL(skcipher_geniv_alloc);
669
670void skcipher_geniv_free(struct crypto_instance *inst)
671{
672    crypto_drop_skcipher(crypto_instance_ctx(inst));
673    kfree(inst);
674}
675EXPORT_SYMBOL_GPL(skcipher_geniv_free);
676
677int skcipher_geniv_init(struct crypto_tfm *tfm)
678{
679    struct crypto_instance *inst = (void *)tfm->__crt_alg;
680    struct crypto_ablkcipher *cipher;
681
682    cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst));
683    if (IS_ERR(cipher))
684        return PTR_ERR(cipher);
685
686    tfm->crt_ablkcipher.base = cipher;
687    tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher);
688
689    return 0;
690}
691EXPORT_SYMBOL_GPL(skcipher_geniv_init);
692
693void skcipher_geniv_exit(struct crypto_tfm *tfm)
694{
695    crypto_free_ablkcipher(tfm->crt_ablkcipher.base);
696}
697EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
698
699MODULE_LICENSE("GPL");
700MODULE_DESCRIPTION("Generic block chaining cipher type");
701

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