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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Public Key Encryption4 *5 * Copyright (c) 2015, Intel Corporation6 * 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 0x0000000e22 23static 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 36static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)37 __maybe_unused;38 39static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)40{41 seq_puts(m, "type : akcipher\n");42}43 44static 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 52static 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 66static 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 73static const struct crypto_type crypto_akcipher_type = {74 .extsize = crypto_alg_extsize,75 .init_tfm = crypto_akcipher_init_tfm,76 .free = crypto_akcipher_free_instance,77#ifdef CONFIG_PROC_FS78 .show = crypto_akcipher_show,79#endif80#if IS_ENABLED(CONFIG_CRYPTO_USER)81 .report = crypto_akcipher_report,82#endif83 .maskclear = ~CRYPTO_ALG_TYPE_MASK,84 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,85 .type = CRYPTO_ALG_TYPE_AKCIPHER,86 .tfmsize = offsetof(struct crypto_akcipher, base),87};88 89int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn,90 struct crypto_instance *inst,91 const char *name, u32 type, u32 mask)92{93 spawn->base.frontend = &crypto_akcipher_type;94 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);95}96EXPORT_SYMBOL_GPL(crypto_grab_akcipher);97 98struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,99 u32 mask)100{101 return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);102}103EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);104 105static void akcipher_prepare_alg(struct akcipher_alg *alg)106{107 struct crypto_alg *base = &alg->base;108 109 base->cra_type = &crypto_akcipher_type;110 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;111 base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;112}113 114static int akcipher_default_op(struct akcipher_request *req)115{116 return -ENOSYS;117}118 119static int akcipher_default_set_key(struct crypto_akcipher *tfm,120 const void *key, unsigned int keylen)121{122 return -ENOSYS;123}124 125int crypto_register_akcipher(struct akcipher_alg *alg)126{127 struct crypto_alg *base = &alg->base;128 129 if (!alg->sign)130 alg->sign = akcipher_default_op;131 if (!alg->verify)132 alg->verify = akcipher_default_op;133 if (!alg->encrypt)134 alg->encrypt = akcipher_default_op;135 if (!alg->decrypt)136 alg->decrypt = akcipher_default_op;137 if (!alg->set_priv_key)138 alg->set_priv_key = akcipher_default_set_key;139 140 akcipher_prepare_alg(alg);141 return crypto_register_alg(base);142}143EXPORT_SYMBOL_GPL(crypto_register_akcipher);144 145void crypto_unregister_akcipher(struct akcipher_alg *alg)146{147 crypto_unregister_alg(&alg->base);148}149EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);150 151int akcipher_register_instance(struct crypto_template *tmpl,152 struct akcipher_instance *inst)153{154 if (WARN_ON(!inst->free))155 return -EINVAL;156 akcipher_prepare_alg(&inst->alg);157 return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));158}159EXPORT_SYMBOL_GPL(akcipher_register_instance);160 161int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)162{163 unsigned int reqsize = crypto_akcipher_reqsize(data->tfm);164 struct akcipher_request *req;165 struct scatterlist *sg;166 unsigned int mlen;167 unsigned int len;168 u8 *buf;169 170 if (data->dst)171 mlen = max(data->slen, data->dlen);172 else173 mlen = data->slen + data->dlen;174 175 len = sizeof(*req) + reqsize + mlen;176 if (len < mlen)177 return -EOVERFLOW;178 179 req = kzalloc(len, GFP_KERNEL);180 if (!req)181 return -ENOMEM;182 183 data->req = req;184 akcipher_request_set_tfm(req, data->tfm);185 186 buf = (u8 *)(req + 1) + reqsize;187 data->buf = buf;188 memcpy(buf, data->src, data->slen);189 190 sg = &data->sg;191 sg_init_one(sg, buf, mlen);192 akcipher_request_set_crypt(req, sg, data->dst ? sg : NULL,193 data->slen, data->dlen);194 195 crypto_init_wait(&data->cwait);196 akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,197 crypto_req_done, &data->cwait);198 199 return 0;200}201EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep);202 203int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err)204{205 err = crypto_wait_req(err, &data->cwait);206 if (data->dst)207 memcpy(data->dst, data->buf, data->dlen);208 data->dlen = data->req->dst_len;209 kfree_sensitive(data->req);210 return err;211}212EXPORT_SYMBOL_GPL(crypto_akcipher_sync_post);213 214int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm,215 const void *src, unsigned int slen,216 void *dst, unsigned int dlen)217{218 struct crypto_akcipher_sync_data data = {219 .tfm = tfm,220 .src = src,221 .dst = dst,222 .slen = slen,223 .dlen = dlen,224 };225 226 return crypto_akcipher_sync_prep(&data) ?:227 crypto_akcipher_sync_post(&data,228 crypto_akcipher_encrypt(data.req));229}230EXPORT_SYMBOL_GPL(crypto_akcipher_sync_encrypt);231 232int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm,233 const void *src, unsigned int slen,234 void *dst, unsigned int dlen)235{236 struct crypto_akcipher_sync_data data = {237 .tfm = tfm,238 .src = src,239 .dst = dst,240 .slen = slen,241 .dlen = dlen,242 };243 244 return crypto_akcipher_sync_prep(&data) ?:245 crypto_akcipher_sync_post(&data,246 crypto_akcipher_decrypt(data.req)) ?:247 data.dlen;248}249EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt);250 251static void crypto_exit_akcipher_ops_sig(struct crypto_tfm *tfm)252{253 struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm);254 255 crypto_free_akcipher(*ctx);256}257 258int crypto_init_akcipher_ops_sig(struct crypto_tfm *tfm)259{260 struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm);261 struct crypto_alg *calg = tfm->__crt_alg;262 struct crypto_akcipher *akcipher;263 264 if (!crypto_mod_get(calg))265 return -EAGAIN;266 267 akcipher = crypto_create_tfm(calg, &crypto_akcipher_type);268 if (IS_ERR(akcipher)) {269 crypto_mod_put(calg);270 return PTR_ERR(akcipher);271 }272 273 *ctx = akcipher;274 tfm->exit = crypto_exit_akcipher_ops_sig;275 276 return 0;277}278EXPORT_SYMBOL_GPL(crypto_init_akcipher_ops_sig);279 280MODULE_LICENSE("GPL");281MODULE_DESCRIPTION("Generic public key cipher type");282