2 * Shared crypto simd helpers
4 * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
5 * Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
7 * Based on aesni-intel_glue.c by:
8 * Copyright (C) 2008, Intel Corp.
9 * Author: Huang Ying <ying.huang@intel.com>
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.
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.
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
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>
36 struct simd_skcipher_alg {
37 const char *ialg_name;
38 struct skcipher_alg alg;
41 struct simd_skcipher_ctx {
42 struct cryptd_skcipher *cryptd_tfm;
45 static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
48 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
49 struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
52 crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
53 crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
55 err = crypto_skcipher_setkey(child, key, key_len);
56 crypto_skcipher_set_flags(tfm, crypto_skcipher_get_flags(child) &
61 static int simd_skcipher_encrypt(struct skcipher_request *req)
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;
68 subreq = skcipher_request_ctx(req);
71 if (!may_use_simd() ||
72 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
73 child = &ctx->cryptd_tfm->base;
75 child = cryptd_skcipher_child(ctx->cryptd_tfm);
77 skcipher_request_set_tfm(subreq, child);
79 return crypto_skcipher_encrypt(subreq);
82 static int simd_skcipher_decrypt(struct skcipher_request *req)
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;
89 subreq = skcipher_request_ctx(req);
92 if (!may_use_simd() ||
93 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
94 child = &ctx->cryptd_tfm->base;
96 child = cryptd_skcipher_child(ctx->cryptd_tfm);
98 skcipher_request_set_tfm(subreq, child);
100 return crypto_skcipher_decrypt(subreq);
103 static void simd_skcipher_exit(struct crypto_skcipher *tfm)
105 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
107 cryptd_free_skcipher(ctx->cryptd_tfm);
110 static int simd_skcipher_init(struct crypto_skcipher *tfm)
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;
118 alg = crypto_skcipher_alg(tfm);
119 salg = container_of(alg, struct simd_skcipher_alg, alg);
121 cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
123 CRYPTO_ALG_INTERNAL);
124 if (IS_ERR(cryptd_tfm))
125 return PTR_ERR(cryptd_tfm);
127 ctx->cryptd_tfm = cryptd_tfm;
129 reqsize = sizeof(struct skcipher_request);
130 reqsize += crypto_skcipher_reqsize(&cryptd_tfm->base);
132 crypto_skcipher_set_reqsize(tfm, reqsize);
137 struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
139 const char *basename)
141 struct simd_skcipher_alg *salg;
142 struct crypto_skcipher *tfm;
143 struct skcipher_alg *ialg;
144 struct skcipher_alg *alg;
147 tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
148 CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
150 return ERR_CAST(tfm);
152 ialg = crypto_skcipher_alg(tfm);
154 salg = kzalloc(sizeof(*salg), GFP_KERNEL);
156 salg = ERR_PTR(-ENOMEM);
160 salg->ialg_name = basename;
164 if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
168 if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
169 drvname) >= CRYPTO_MAX_ALG_NAME)
172 alg->base.cra_flags = CRYPTO_ALG_ASYNC;
173 alg->base.cra_priority = ialg->base.cra_priority;
174 alg->base.cra_blocksize = ialg->base.cra_blocksize;
175 alg->base.cra_alignmask = ialg->base.cra_alignmask;
176 alg->base.cra_module = ialg->base.cra_module;
177 alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
179 alg->ivsize = ialg->ivsize;
180 alg->chunksize = ialg->chunksize;
181 alg->min_keysize = ialg->min_keysize;
182 alg->max_keysize = ialg->max_keysize;
184 alg->init = simd_skcipher_init;
185 alg->exit = simd_skcipher_exit;
187 alg->setkey = simd_skcipher_setkey;
188 alg->encrypt = simd_skcipher_encrypt;
189 alg->decrypt = simd_skcipher_decrypt;
191 err = crypto_register_skcipher(alg);
196 crypto_free_skcipher(tfm);
204 EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
206 struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
207 const char *basename)
209 char drvname[CRYPTO_MAX_ALG_NAME];
211 if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
213 return ERR_PTR(-ENAMETOOLONG);
215 return simd_skcipher_create_compat(algname, drvname, basename);
217 EXPORT_SYMBOL_GPL(simd_skcipher_create);
219 void simd_skcipher_free(struct simd_skcipher_alg *salg)
221 crypto_unregister_skcipher(&salg->alg);
224 EXPORT_SYMBOL_GPL(simd_skcipher_free);
226 MODULE_LICENSE("GPL");