1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Public Key Encryption 4 * 5 * Copyright (c) 2015, Intel Corporation 6 * Authors: Tadeusz Struk <tadeusz.struk@intel.com> 7 */ 8 #include <crypto/internal/akcipher.h> 9 #include <linux/cryptouser.h> 10 #include <linux/errno.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/scatterlist.h> 14 #include <linux/seq_file.h> 15 #include <linux/slab.h> 16 #include <linux/string.h> 17 #include <net/netlink.h> 18 19 #include "internal.h" 20 21 #define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e 22 23 static int __maybe_unused crypto_akcipher_report( 24 struct sk_buff *skb, struct crypto_alg *alg) 25 { 26 struct crypto_report_akcipher rakcipher; 27 28 memset(&rakcipher, 0, sizeof(rakcipher)); 29 30 strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); 31 32 return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, 33 sizeof(rakcipher), &rakcipher); 34 } 35 36 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) 37 __maybe_unused; 38 39 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) 40 { 41 seq_puts(m, "type : akcipher\n"); 42 } 43 44 static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm) 45 { 46 struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); 47 struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); 48 49 alg->exit(akcipher); 50 } 51 52 static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm) 53 { 54 struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); 55 struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); 56 57 if (alg->exit) 58 akcipher->base.exit = crypto_akcipher_exit_tfm; 59 60 if (alg->init) 61 return alg->init(akcipher); 62 63 return 0; 64 } 65 66 static void crypto_akcipher_free_instance(struct crypto_instance *inst) 67 { 68 struct akcipher_instance *akcipher = akcipher_instance(inst); 69 70 akcipher->free(akcipher); 71 } 72 73 static int __maybe_unused crypto_akcipher_report_stat( 74 struct sk_buff *skb, struct crypto_alg *alg) 75 { 76 struct akcipher_alg *akcipher = __crypto_akcipher_alg(alg); 77 struct crypto_istat_akcipher *istat; 78 struct crypto_stat_akcipher rakcipher; 79 80 istat = akcipher_get_stat(akcipher); 81 82 memset(&rakcipher, 0, sizeof(rakcipher)); 83 84 strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); 85 rakcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt); 86 rakcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen); 87 rakcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt); 88 rakcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen); 89 rakcipher.stat_sign_cnt = atomic64_read(&istat->sign_cnt); 90 rakcipher.stat_verify_cnt = atomic64_read(&istat->verify_cnt); 91 rakcipher.stat_err_cnt = atomic64_read(&istat->err_cnt); 92 93 return nla_put(skb, CRYPTOCFGA_STAT_AKCIPHER, 94 sizeof(rakcipher), &rakcipher); 95 } 96 97 static const struct crypto_type crypto_akcipher_type = { 98 .extsize = crypto_alg_extsize, 99 .init_tfm = crypto_akcipher_init_tfm, 100 .free = crypto_akcipher_free_instance, 101 #ifdef CONFIG_PROC_FS 102 .show = crypto_akcipher_show, 103 #endif 104 #if IS_ENABLED(CONFIG_CRYPTO_USER) 105 .report = crypto_akcipher_report, 106 #endif 107 #ifdef CONFIG_CRYPTO_STATS 108 .report_stat = crypto_akcipher_report_stat, 109 #endif 110 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 111 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, 112 .type = CRYPTO_ALG_TYPE_AKCIPHER, 113 .tfmsize = offsetof(struct crypto_akcipher, base), 114 }; 115 116 int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, 117 struct crypto_instance *inst, 118 const char *name, u32 type, u32 mask) 119 { 120 spawn->base.frontend = &crypto_akcipher_type; 121 return crypto_grab_spawn(&spawn->base, inst, name, type, mask); 122 } 123 EXPORT_SYMBOL_GPL(crypto_grab_akcipher); 124 125 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type, 126 u32 mask) 127 { 128 return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask); 129 } 130 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher); 131 132 static void akcipher_prepare_alg(struct akcipher_alg *alg) 133 { 134 struct crypto_istat_akcipher *istat = akcipher_get_stat(alg); 135 struct crypto_alg *base = &alg->base; 136 137 base->cra_type = &crypto_akcipher_type; 138 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 139 base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER; 140 141 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) 142 memset(istat, 0, sizeof(*istat)); 143 } 144 145 static int akcipher_default_op(struct akcipher_request *req) 146 { 147 return -ENOSYS; 148 } 149 150 static int akcipher_default_set_key(struct crypto_akcipher *tfm, 151 const void *key, unsigned int keylen) 152 { 153 return -ENOSYS; 154 } 155 156 int crypto_register_akcipher(struct akcipher_alg *alg) 157 { 158 struct crypto_alg *base = &alg->base; 159 160 if (!alg->sign) 161 alg->sign = akcipher_default_op; 162 if (!alg->verify) 163 alg->verify = akcipher_default_op; 164 if (!alg->encrypt) 165 alg->encrypt = akcipher_default_op; 166 if (!alg->decrypt) 167 alg->decrypt = akcipher_default_op; 168 if (!alg->set_priv_key) 169 alg->set_priv_key = akcipher_default_set_key; 170 171 akcipher_prepare_alg(alg); 172 return crypto_register_alg(base); 173 } 174 EXPORT_SYMBOL_GPL(crypto_register_akcipher); 175 176 void crypto_unregister_akcipher(struct akcipher_alg *alg) 177 { 178 crypto_unregister_alg(&alg->base); 179 } 180 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher); 181 182 int akcipher_register_instance(struct crypto_template *tmpl, 183 struct akcipher_instance *inst) 184 { 185 if (WARN_ON(!inst->free)) 186 return -EINVAL; 187 akcipher_prepare_alg(&inst->alg); 188 return crypto_register_instance(tmpl, akcipher_crypto_instance(inst)); 189 } 190 EXPORT_SYMBOL_GPL(akcipher_register_instance); 191 192 int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data) 193 { 194 unsigned int reqsize = crypto_akcipher_reqsize(data->tfm); 195 struct akcipher_request *req; 196 struct scatterlist *sg; 197 unsigned int mlen; 198 unsigned int len; 199 u8 *buf; 200 201 if (data->dst) 202 mlen = max(data->slen, data->dlen); 203 else 204 mlen = data->slen + data->dlen; 205 206 len = sizeof(*req) + reqsize + mlen; 207 if (len < mlen) 208 return -EOVERFLOW; 209 210 req = kzalloc(len, GFP_KERNEL); 211 if (!req) 212 return -ENOMEM; 213 214 data->req = req; 215 akcipher_request_set_tfm(req, data->tfm); 216 217 buf = (u8 *)(req + 1) + reqsize; 218 data->buf = buf; 219 memcpy(buf, data->src, data->slen); 220 221 sg = &data->sg; 222 sg_init_one(sg, buf, mlen); 223 akcipher_request_set_crypt(req, sg, data->dst ? sg : NULL, 224 data->slen, data->dlen); 225 226 crypto_init_wait(&data->cwait); 227 akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, 228 crypto_req_done, &data->cwait); 229 230 return 0; 231 } 232 EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep); 233 234 int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err) 235 { 236 err = crypto_wait_req(err, &data->cwait); 237 if (data->dst) 238 memcpy(data->dst, data->buf, data->dlen); 239 data->dlen = data->req->dst_len; 240 kfree_sensitive(data->req); 241 return err; 242 } 243 EXPORT_SYMBOL_GPL(crypto_akcipher_sync_post); 244 245 int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm, 246 const void *src, unsigned int slen, 247 void *dst, unsigned int dlen) 248 { 249 struct crypto_akcipher_sync_data data = { 250 .tfm = tfm, 251 .src = src, 252 .dst = dst, 253 .slen = slen, 254 .dlen = dlen, 255 }; 256 257 return crypto_akcipher_sync_prep(&data) ?: 258 crypto_akcipher_sync_post(&data, 259 crypto_akcipher_encrypt(data.req)); 260 } 261 EXPORT_SYMBOL_GPL(crypto_akcipher_sync_encrypt); 262 263 int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm, 264 const void *src, unsigned int slen, 265 void *dst, unsigned int dlen) 266 { 267 struct crypto_akcipher_sync_data data = { 268 .tfm = tfm, 269 .src = src, 270 .dst = dst, 271 .slen = slen, 272 .dlen = dlen, 273 }; 274 275 return crypto_akcipher_sync_prep(&data) ?: 276 crypto_akcipher_sync_post(&data, 277 crypto_akcipher_decrypt(data.req)) ?: 278 data.dlen; 279 } 280 EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt); 281 282 static void crypto_exit_akcipher_ops_sig(struct crypto_tfm *tfm) 283 { 284 struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm); 285 286 crypto_free_akcipher(*ctx); 287 } 288 289 int crypto_init_akcipher_ops_sig(struct crypto_tfm *tfm) 290 { 291 struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm); 292 struct crypto_alg *calg = tfm->__crt_alg; 293 struct crypto_akcipher *akcipher; 294 295 if (!crypto_mod_get(calg)) 296 return -EAGAIN; 297 298 akcipher = crypto_create_tfm(calg, &crypto_akcipher_type); 299 if (IS_ERR(akcipher)) { 300 crypto_mod_put(calg); 301 return PTR_ERR(akcipher); 302 } 303 304 *ctx = akcipher; 305 tfm->exit = crypto_exit_akcipher_ops_sig; 306 307 return 0; 308 } 309 EXPORT_SYMBOL_GPL(crypto_init_akcipher_ops_sig); 310 311 MODULE_LICENSE("GPL"); 312 MODULE_DESCRIPTION("Generic public key cipher type"); 313