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, see <http://www.gnu.org/licenses/>. 23 * 24 */ 25 26 #include <crypto/cryptd.h> 27 #include <crypto/internal/simd.h> 28 #include <crypto/internal/skcipher.h> 29 #include <linux/kernel.h> 30 #include <linux/module.h> 31 #include <linux/preempt.h> 32 #include <asm/simd.h> 33 34 struct simd_skcipher_alg { 35 const char *ialg_name; 36 struct skcipher_alg alg; 37 }; 38 39 struct simd_skcipher_ctx { 40 struct cryptd_skcipher *cryptd_tfm; 41 }; 42 43 static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, 44 unsigned int key_len) 45 { 46 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 47 struct crypto_skcipher *child = &ctx->cryptd_tfm->base; 48 int err; 49 50 crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); 51 crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) & 52 CRYPTO_TFM_REQ_MASK); 53 err = crypto_skcipher_setkey(child, key, key_len); 54 crypto_skcipher_set_flags(tfm, crypto_skcipher_get_flags(child) & 55 CRYPTO_TFM_RES_MASK); 56 return err; 57 } 58 59 static int simd_skcipher_encrypt(struct skcipher_request *req) 60 { 61 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 62 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 63 struct skcipher_request *subreq; 64 struct crypto_skcipher *child; 65 66 subreq = skcipher_request_ctx(req); 67 *subreq = *req; 68 69 if (!may_use_simd() || 70 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm))) 71 child = &ctx->cryptd_tfm->base; 72 else 73 child = cryptd_skcipher_child(ctx->cryptd_tfm); 74 75 skcipher_request_set_tfm(subreq, child); 76 77 return crypto_skcipher_encrypt(subreq); 78 } 79 80 static int simd_skcipher_decrypt(struct skcipher_request *req) 81 { 82 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 83 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 84 struct skcipher_request *subreq; 85 struct crypto_skcipher *child; 86 87 subreq = skcipher_request_ctx(req); 88 *subreq = *req; 89 90 if (!may_use_simd() || 91 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm))) 92 child = &ctx->cryptd_tfm->base; 93 else 94 child = cryptd_skcipher_child(ctx->cryptd_tfm); 95 96 skcipher_request_set_tfm(subreq, child); 97 98 return crypto_skcipher_decrypt(subreq); 99 } 100 101 static void simd_skcipher_exit(struct crypto_skcipher *tfm) 102 { 103 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 104 105 cryptd_free_skcipher(ctx->cryptd_tfm); 106 } 107 108 static int simd_skcipher_init(struct crypto_skcipher *tfm) 109 { 110 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 111 struct cryptd_skcipher *cryptd_tfm; 112 struct simd_skcipher_alg *salg; 113 struct skcipher_alg *alg; 114 unsigned reqsize; 115 116 alg = crypto_skcipher_alg(tfm); 117 salg = container_of(alg, struct simd_skcipher_alg, alg); 118 119 cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name, 120 CRYPTO_ALG_INTERNAL, 121 CRYPTO_ALG_INTERNAL); 122 if (IS_ERR(cryptd_tfm)) 123 return PTR_ERR(cryptd_tfm); 124 125 ctx->cryptd_tfm = cryptd_tfm; 126 127 reqsize = sizeof(struct skcipher_request); 128 reqsize += crypto_skcipher_reqsize(&cryptd_tfm->base); 129 130 crypto_skcipher_set_reqsize(tfm, reqsize); 131 132 return 0; 133 } 134 135 struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname, 136 const char *drvname, 137 const char *basename) 138 { 139 struct simd_skcipher_alg *salg; 140 struct crypto_skcipher *tfm; 141 struct skcipher_alg *ialg; 142 struct skcipher_alg *alg; 143 int err; 144 145 tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL, 146 CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC); 147 if (IS_ERR(tfm)) 148 return ERR_CAST(tfm); 149 150 ialg = crypto_skcipher_alg(tfm); 151 152 salg = kzalloc(sizeof(*salg), GFP_KERNEL); 153 if (!salg) { 154 salg = ERR_PTR(-ENOMEM); 155 goto out_put_tfm; 156 } 157 158 salg->ialg_name = basename; 159 alg = &salg->alg; 160 161 err = -ENAMETOOLONG; 162 if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >= 163 CRYPTO_MAX_ALG_NAME) 164 goto out_free_salg; 165 166 if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 167 drvname) >= CRYPTO_MAX_ALG_NAME) 168 goto out_free_salg; 169 170 alg->base.cra_flags = CRYPTO_ALG_ASYNC; 171 alg->base.cra_priority = ialg->base.cra_priority; 172 alg->base.cra_blocksize = ialg->base.cra_blocksize; 173 alg->base.cra_alignmask = ialg->base.cra_alignmask; 174 alg->base.cra_module = ialg->base.cra_module; 175 alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx); 176 177 alg->ivsize = ialg->ivsize; 178 alg->chunksize = ialg->chunksize; 179 alg->min_keysize = ialg->min_keysize; 180 alg->max_keysize = ialg->max_keysize; 181 182 alg->init = simd_skcipher_init; 183 alg->exit = simd_skcipher_exit; 184 185 alg->setkey = simd_skcipher_setkey; 186 alg->encrypt = simd_skcipher_encrypt; 187 alg->decrypt = simd_skcipher_decrypt; 188 189 err = crypto_register_skcipher(alg); 190 if (err) 191 goto out_free_salg; 192 193 out_put_tfm: 194 crypto_free_skcipher(tfm); 195 return salg; 196 197 out_free_salg: 198 kfree(salg); 199 salg = ERR_PTR(err); 200 goto out_put_tfm; 201 } 202 EXPORT_SYMBOL_GPL(simd_skcipher_create_compat); 203 204 struct simd_skcipher_alg *simd_skcipher_create(const char *algname, 205 const char *basename) 206 { 207 char drvname[CRYPTO_MAX_ALG_NAME]; 208 209 if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >= 210 CRYPTO_MAX_ALG_NAME) 211 return ERR_PTR(-ENAMETOOLONG); 212 213 return simd_skcipher_create_compat(algname, drvname, basename); 214 } 215 EXPORT_SYMBOL_GPL(simd_skcipher_create); 216 217 void simd_skcipher_free(struct simd_skcipher_alg *salg) 218 { 219 crypto_unregister_skcipher(&salg->alg); 220 kfree(salg); 221 } 222 EXPORT_SYMBOL_GPL(simd_skcipher_free); 223 224 MODULE_LICENSE("GPL"); 225