1 /*
2 * Shared crypto simd helpers
3 *
4 * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
5 * Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
6 *
7 * Based on aesni-intel_glue.c by:
8 * Copyright (C) 2008, Intel Corp.
9 * Author: Huang Ying <ying.huang@intel.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 * USA
25 *
26 */
27
28 #include <crypto/cryptd.h>
29 #include <crypto/internal/simd.h>
30 #include <crypto/internal/skcipher.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/preempt.h>
34 #include <asm/simd.h>
35
36 struct simd_skcipher_alg {
37 const char *ialg_name;
38 struct skcipher_alg alg;
39 };
40
41 struct simd_skcipher_ctx {
42 struct cryptd_skcipher *cryptd_tfm;
43 };
44
simd_skcipher_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int key_len)45 static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
46 unsigned int key_len)
47 {
48 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
49 struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
50 int err;
51
52 crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
53 crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
54 CRYPTO_TFM_REQ_MASK);
55 err = crypto_skcipher_setkey(child, key, key_len);
56 crypto_skcipher_set_flags(tfm, crypto_skcipher_get_flags(child) &
57 CRYPTO_TFM_RES_MASK);
58 return err;
59 }
60
simd_skcipher_encrypt(struct skcipher_request * req)61 static int simd_skcipher_encrypt(struct skcipher_request *req)
62 {
63 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
64 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
65 struct skcipher_request *subreq;
66 struct crypto_skcipher *child;
67
68 subreq = skcipher_request_ctx(req);
69 *subreq = *req;
70
71 if (!may_use_simd() ||
72 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
73 child = &ctx->cryptd_tfm->base;
74 else
75 child = cryptd_skcipher_child(ctx->cryptd_tfm);
76
77 skcipher_request_set_tfm(subreq, child);
78
79 return crypto_skcipher_encrypt(subreq);
80 }
81
simd_skcipher_decrypt(struct skcipher_request * req)82 static int simd_skcipher_decrypt(struct skcipher_request *req)
83 {
84 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
85 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
86 struct skcipher_request *subreq;
87 struct crypto_skcipher *child;
88
89 subreq = skcipher_request_ctx(req);
90 *subreq = *req;
91
92 if (!may_use_simd() ||
93 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
94 child = &ctx->cryptd_tfm->base;
95 else
96 child = cryptd_skcipher_child(ctx->cryptd_tfm);
97
98 skcipher_request_set_tfm(subreq, child);
99
100 return crypto_skcipher_decrypt(subreq);
101 }
102
simd_skcipher_exit(struct crypto_skcipher * tfm)103 static void simd_skcipher_exit(struct crypto_skcipher *tfm)
104 {
105 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
106
107 cryptd_free_skcipher(ctx->cryptd_tfm);
108 }
109
simd_skcipher_init(struct crypto_skcipher * tfm)110 static int simd_skcipher_init(struct crypto_skcipher *tfm)
111 {
112 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
113 struct cryptd_skcipher *cryptd_tfm;
114 struct simd_skcipher_alg *salg;
115 struct skcipher_alg *alg;
116 unsigned reqsize;
117
118 alg = crypto_skcipher_alg(tfm);
119 salg = container_of(alg, struct simd_skcipher_alg, alg);
120
121 cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
122 CRYPTO_ALG_INTERNAL,
123 CRYPTO_ALG_INTERNAL);
124 if (IS_ERR(cryptd_tfm))
125 return PTR_ERR(cryptd_tfm);
126
127 ctx->cryptd_tfm = cryptd_tfm;
128
129 reqsize = crypto_skcipher_reqsize(cryptd_skcipher_child(cryptd_tfm));
130 reqsize = max(reqsize, crypto_skcipher_reqsize(&cryptd_tfm->base));
131 reqsize += sizeof(struct skcipher_request);
132
133 crypto_skcipher_set_reqsize(tfm, reqsize);
134
135 return 0;
136 }
137
simd_skcipher_create_compat(const char * algname,const char * drvname,const char * basename)138 struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
139 const char *drvname,
140 const char *basename)
141 {
142 struct simd_skcipher_alg *salg;
143 struct crypto_skcipher *tfm;
144 struct skcipher_alg *ialg;
145 struct skcipher_alg *alg;
146 int err;
147
148 tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
149 CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
150 if (IS_ERR(tfm))
151 return ERR_CAST(tfm);
152
153 ialg = crypto_skcipher_alg(tfm);
154
155 salg = kzalloc(sizeof(*salg), GFP_KERNEL);
156 if (!salg) {
157 salg = ERR_PTR(-ENOMEM);
158 goto out_put_tfm;
159 }
160
161 salg->ialg_name = basename;
162 alg = &salg->alg;
163
164 err = -ENAMETOOLONG;
165 if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
166 CRYPTO_MAX_ALG_NAME)
167 goto out_free_salg;
168
169 if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
170 drvname) >= CRYPTO_MAX_ALG_NAME)
171 goto out_free_salg;
172
173 alg->base.cra_flags = CRYPTO_ALG_ASYNC;
174 alg->base.cra_priority = ialg->base.cra_priority;
175 alg->base.cra_blocksize = ialg->base.cra_blocksize;
176 alg->base.cra_alignmask = ialg->base.cra_alignmask;
177 alg->base.cra_module = ialg->base.cra_module;
178 alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
179
180 alg->ivsize = ialg->ivsize;
181 alg->chunksize = ialg->chunksize;
182 alg->min_keysize = ialg->min_keysize;
183 alg->max_keysize = ialg->max_keysize;
184
185 alg->init = simd_skcipher_init;
186 alg->exit = simd_skcipher_exit;
187
188 alg->setkey = simd_skcipher_setkey;
189 alg->encrypt = simd_skcipher_encrypt;
190 alg->decrypt = simd_skcipher_decrypt;
191
192 err = crypto_register_skcipher(alg);
193 if (err)
194 goto out_free_salg;
195
196 out_put_tfm:
197 crypto_free_skcipher(tfm);
198 return salg;
199
200 out_free_salg:
201 kfree(salg);
202 salg = ERR_PTR(err);
203 goto out_put_tfm;
204 }
205 EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
206
simd_skcipher_create(const char * algname,const char * basename)207 struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
208 const char *basename)
209 {
210 char drvname[CRYPTO_MAX_ALG_NAME];
211
212 if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
213 CRYPTO_MAX_ALG_NAME)
214 return ERR_PTR(-ENAMETOOLONG);
215
216 return simd_skcipher_create_compat(algname, drvname, basename);
217 }
218 EXPORT_SYMBOL_GPL(simd_skcipher_create);
219
simd_skcipher_free(struct simd_skcipher_alg * salg)220 void simd_skcipher_free(struct simd_skcipher_alg *salg)
221 {
222 crypto_unregister_skcipher(&salg->alg);
223 kfree(salg);
224 }
225 EXPORT_SYMBOL_GPL(simd_skcipher_free);
226
227 MODULE_LICENSE("GPL");
228