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 "internal.h"
28
29static const char *skcipher_default_geniv __read_mostly;
30
31static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
32                unsigned int keylen)
33{
34    struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
35    unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
36    int ret;
37    u8 *buffer, *alignbuffer;
38    unsigned long absize;
39
40    absize = keylen + alignmask;
41    buffer = kmalloc(absize, GFP_ATOMIC);
42    if (!buffer)
43        return -ENOMEM;
44
45    alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
46    memcpy(alignbuffer, key, keylen);
47    ret = cipher->setkey(tfm, alignbuffer, keylen);
48    memset(alignbuffer, 0, keylen);
49    kfree(buffer);
50    return ret;
51}
52
53static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
54          unsigned int keylen)
55{
56    struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
57    unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
58
59    if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
60        crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
61        return -EINVAL;
62    }
63
64    if ((unsigned long)key & alignmask)
65        return setkey_unaligned(tfm, key, keylen);
66
67    return cipher->setkey(tfm, key, keylen);
68}
69
70static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
71                          u32 mask)
72{
73    return alg->cra_ctxsize;
74}
75
76int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
77{
78    return crypto_ablkcipher_encrypt(&req->creq);
79}
80
81int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
82{
83    return crypto_ablkcipher_decrypt(&req->creq);
84}
85
86static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
87                      u32 mask)
88{
89    struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
90    struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
91
92    if (alg->ivsize > PAGE_SIZE / 8)
93        return -EINVAL;
94
95    crt->setkey = setkey;
96    crt->encrypt = alg->encrypt;
97    crt->decrypt = alg->decrypt;
98    if (!alg->ivsize) {
99        crt->givencrypt = skcipher_null_givencrypt;
100        crt->givdecrypt = skcipher_null_givdecrypt;
101    }
102    crt->base = __crypto_ablkcipher_cast(tfm);
103    crt->ivsize = alg->ivsize;
104
105    return 0;
106}
107
108static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
109    __attribute__ ((unused));
110static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
111{
112    struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
113
114    seq_printf(m, "type : ablkcipher\n");
115    seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
116                         "yes" : "no");
117    seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
118    seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
119    seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
120    seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
121    seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
122}
123
124const struct crypto_type crypto_ablkcipher_type = {
125    .ctxsize = crypto_ablkcipher_ctxsize,
126    .init = crypto_init_ablkcipher_ops,
127#ifdef CONFIG_PROC_FS
128    .show = crypto_ablkcipher_show,
129#endif
130};
131EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
132
133static int no_givdecrypt(struct skcipher_givcrypt_request *req)
134{
135    return -ENOSYS;
136}
137
138static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
139                      u32 mask)
140{
141    struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
142    struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
143
144    if (alg->ivsize > PAGE_SIZE / 8)
145        return -EINVAL;
146
147    crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
148              alg->setkey : setkey;
149    crt->encrypt = alg->encrypt;
150    crt->decrypt = alg->decrypt;
151    crt->givencrypt = alg->givencrypt;
152    crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
153    crt->base = __crypto_ablkcipher_cast(tfm);
154    crt->ivsize = alg->ivsize;
155
156    return 0;
157}
158
159static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
160    __attribute__ ((unused));
161static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
162{
163    struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
164
165    seq_printf(m, "type : givcipher\n");
166    seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
167                         "yes" : "no");
168    seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
169    seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
170    seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
171    seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
172    seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
173}
174
175const struct crypto_type crypto_givcipher_type = {
176    .ctxsize = crypto_ablkcipher_ctxsize,
177    .init = crypto_init_givcipher_ops,
178#ifdef CONFIG_PROC_FS
179    .show = crypto_givcipher_show,
180#endif
181};
182EXPORT_SYMBOL_GPL(crypto_givcipher_type);
183
184const char *crypto_default_geniv(const struct crypto_alg *alg)
185{
186    if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
187         CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
188                     alg->cra_ablkcipher.ivsize) !=
189        alg->cra_blocksize)
190        return "chainiv";
191
192    return alg->cra_flags & CRYPTO_ALG_ASYNC ?
193           "eseqiv" : skcipher_default_geniv;
194}
195
196static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
197{
198    struct rtattr *tb[3];
199    struct {
200        struct rtattr attr;
201        struct crypto_attr_type data;
202    } ptype;
203    struct {
204        struct rtattr attr;
205        struct crypto_attr_alg data;
206    } palg;
207    struct crypto_template *tmpl;
208    struct crypto_instance *inst;
209    struct crypto_alg *larval;
210    const char *geniv;
211    int err;
212
213    larval = crypto_larval_lookup(alg->cra_driver_name,
214                      (type & ~CRYPTO_ALG_TYPE_MASK) |
215                      CRYPTO_ALG_TYPE_GIVCIPHER,
216                      mask | CRYPTO_ALG_TYPE_MASK);
217    err = PTR_ERR(larval);
218    if (IS_ERR(larval))
219        goto out;
220
221    err = -EAGAIN;
222    if (!crypto_is_larval(larval))
223        goto drop_larval;
224
225    ptype.attr.rta_len = sizeof(ptype);
226    ptype.attr.rta_type = CRYPTOA_TYPE;
227    ptype.data.type = type | CRYPTO_ALG_GENIV;
228    /* GENIV tells the template that we're making a default geniv. */
229    ptype.data.mask = mask | CRYPTO_ALG_GENIV;
230    tb[0] = &ptype.attr;
231
232    palg.attr.rta_len = sizeof(palg);
233    palg.attr.rta_type = CRYPTOA_ALG;
234    /* Must use the exact name to locate ourselves. */
235    memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
236    tb[1] = &palg.attr;
237
238    tb[2] = NULL;
239
240    if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
241        CRYPTO_ALG_TYPE_BLKCIPHER)
242        geniv = alg->cra_blkcipher.geniv;
243    else
244        geniv = alg->cra_ablkcipher.geniv;
245
246    if (!geniv)
247        geniv = crypto_default_geniv(alg);
248
249    tmpl = crypto_lookup_template(geniv);
250    err = -ENOENT;
251    if (!tmpl)
252        goto kill_larval;
253
254    inst = tmpl->alloc(tb);
255    err = PTR_ERR(inst);
256    if (IS_ERR(inst))
257        goto put_tmpl;
258
259    if ((err = crypto_register_instance(tmpl, inst))) {
260        tmpl->free(inst);
261        goto put_tmpl;
262    }
263
264    /* Redo the lookup to use the instance we just registered. */
265    err = -EAGAIN;
266
267put_tmpl:
268    crypto_tmpl_put(tmpl);
269kill_larval:
270    crypto_larval_kill(larval);
271drop_larval:
272    crypto_mod_put(larval);
273out:
274    crypto_mod_put(alg);
275    return err;
276}
277
278static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type,
279                         u32 mask)
280{
281    struct crypto_alg *alg;
282
283    alg = crypto_alg_mod_lookup(name, type, mask);
284    if (IS_ERR(alg))
285        return alg;
286
287    if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
288        CRYPTO_ALG_TYPE_GIVCIPHER)
289        return alg;
290
291    if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
292          CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
293                      alg->cra_ablkcipher.ivsize))
294        return alg;
295
296    crypto_mod_put(alg);
297    alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
298                    mask & ~CRYPTO_ALG_TESTED);
299    if (IS_ERR(alg))
300        return alg;
301
302    if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
303        CRYPTO_ALG_TYPE_GIVCIPHER) {
304        if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
305            crypto_mod_put(alg);
306            alg = ERR_PTR(-ENOENT);
307        }
308        return alg;
309    }
310
311    BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
312         CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
313                         alg->cra_ablkcipher.ivsize));
314
315    return ERR_PTR(crypto_givcipher_default(alg, type, mask));
316}
317
318int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
319             u32 type, u32 mask)
320{
321    struct crypto_alg *alg;
322    int err;
323
324    type = crypto_skcipher_type(type);
325    mask = crypto_skcipher_mask(mask);
326
327    alg = crypto_lookup_skcipher(name, type, mask);
328    if (IS_ERR(alg))
329        return PTR_ERR(alg);
330
331    err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
332    crypto_mod_put(alg);
333    return err;
334}
335EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
336
337struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
338                          u32 type, u32 mask)
339{
340    struct crypto_tfm *tfm;
341    int err;
342
343    type = crypto_skcipher_type(type);
344    mask = crypto_skcipher_mask(mask);
345
346    for (;;) {
347        struct crypto_alg *alg;
348
349        alg = crypto_lookup_skcipher(alg_name, type, mask);
350        if (IS_ERR(alg)) {
351            err = PTR_ERR(alg);
352            goto err;
353        }
354
355        tfm = __crypto_alloc_tfm(alg, type, mask);
356        if (!IS_ERR(tfm))
357            return __crypto_ablkcipher_cast(tfm);
358
359        crypto_mod_put(alg);
360        err = PTR_ERR(tfm);
361
362err:
363        if (err != -EAGAIN)
364            break;
365        if (signal_pending(current)) {
366            err = -EINTR;
367            break;
368        }
369    }
370
371    return ERR_PTR(err);
372}
373EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
374
375static int __init skcipher_module_init(void)
376{
377    skcipher_default_geniv = num_possible_cpus() > 1 ?
378                 "eseqiv" : "chainiv";
379    return 0;
380}
381
382static void skcipher_module_exit(void)
383{
384}
385
386module_init(skcipher_module_init);
387module_exit(skcipher_module_exit);
388

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