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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253// SPDX-License-Identifier: GPL-2.0-or-later/* * Public Key Encryption * * Copyright (c) 2015, Intel Corporation * Authors: Tadeusz Struk <tadeusz.struk@intel.com> */#include <crypto/internal/akcipher.h>#include <linux/cryptouser.h>#include <linux/errno.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/scatterlist.h>#include <linux/seq_file.h>#include <linux/slab.h>#include <linux/string.h>#include <net/netlink.h>
#include "internal.h"
#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
struct crypto_akcipher_sync_data { struct crypto_akcipher *tfm; const void *src; void *dst; unsigned int slen; unsigned int dlen;
struct akcipher_request *req; struct crypto_wait cwait; struct scatterlist sg; u8 *buf;};
static int __maybe_unused crypto_akcipher_report( struct sk_buff *skb, struct crypto_alg *alg){ struct crypto_report_akcipher rakcipher = { .type = "akcipher", };
return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, sizeof(rakcipher), &rakcipher);}
static void __maybe_unused crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg){ seq_puts(m, "type : akcipher\n");}
static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm){ struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
alg->exit(akcipher);}
static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm){ struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
if (alg->exit) akcipher->base.exit = crypto_akcipher_exit_tfm;
if (alg->init) return alg->init(akcipher);
return 0;}
static void crypto_akcipher_free_instance(struct crypto_instance *inst){ struct akcipher_instance *akcipher = akcipher_instance(inst);
akcipher->free(akcipher);}
static const struct crypto_type crypto_akcipher_type = { .extsize = crypto_alg_extsize, .init_tfm = crypto_akcipher_init_tfm, .free = crypto_akcipher_free_instance,#ifdef CONFIG_PROC_FS .show = crypto_akcipher_show,#endif#if IS_ENABLED(CONFIG_CRYPTO_USER) .report = crypto_akcipher_report,#endif .maskclear = ~CRYPTO_ALG_TYPE_MASK, .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, .type = CRYPTO_ALG_TYPE_AKCIPHER, .tfmsize = offsetof(struct crypto_akcipher, base), .algsize = offsetof(struct akcipher_alg, base),};
int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, struct crypto_instance *inst, const char *name, u32 type, u32 mask){ spawn->base.frontend = &crypto_akcipher_type; return crypto_grab_spawn(&spawn->base, inst, name, type, mask);}EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type, u32 mask){ return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);}EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
static void akcipher_prepare_alg(struct akcipher_alg *alg){ struct crypto_alg *base = &alg->base;
base->cra_type = &crypto_akcipher_type; base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;}
static int akcipher_default_op(struct akcipher_request *req){ return -ENOSYS;}
static int akcipher_default_set_key(struct crypto_akcipher *tfm, const void *key, unsigned int keylen){ return -ENOSYS;}
int crypto_register_akcipher(struct akcipher_alg *alg){ struct crypto_alg *base = &alg->base;
if (!alg->encrypt) alg->encrypt = akcipher_default_op; if (!alg->decrypt) alg->decrypt = akcipher_default_op; if (!alg->set_priv_key) alg->set_priv_key = akcipher_default_set_key;
akcipher_prepare_alg(alg); return crypto_register_alg(base);}EXPORT_SYMBOL_GPL(crypto_register_akcipher);
void crypto_unregister_akcipher(struct akcipher_alg *alg){ crypto_unregister_alg(&alg->base);}EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
int akcipher_register_instance(struct crypto_template *tmpl, struct akcipher_instance *inst){ if (WARN_ON(!inst->free)) return -EINVAL; akcipher_prepare_alg(&inst->alg); return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));}EXPORT_SYMBOL_GPL(akcipher_register_instance);
static int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data){ unsigned int reqsize = crypto_akcipher_reqsize(data->tfm); struct akcipher_request *req; struct scatterlist *sg; unsigned int mlen; unsigned int len; u8 *buf;
mlen = max(data->slen, data->dlen);
len = sizeof(*req) + reqsize + mlen; if (len < mlen) return -EOVERFLOW;
req = kzalloc(len, GFP_KERNEL); if (!req) return -ENOMEM;
data->req = req; akcipher_request_set_tfm(req, data->tfm);
buf = (u8 *)(req + 1) + reqsize; data->buf = buf; memcpy(buf, data->src, data->slen);
sg = &data->sg; sg_init_one(sg, buf, mlen); akcipher_request_set_crypt(req, sg, sg, data->slen, data->dlen);
crypto_init_wait(&data->cwait); akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, crypto_req_done, &data->cwait);
return 0;}
static int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err){ err = crypto_wait_req(err, &data->cwait); memcpy(data->dst, data->buf, data->dlen); data->dlen = data->req->dst_len; kfree_sensitive(data->req); return err;}
int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm, const void *src, unsigned int slen, void *dst, unsigned int dlen){ struct crypto_akcipher_sync_data data = { .tfm = tfm, .src = src, .dst = dst, .slen = slen, .dlen = dlen, };
return crypto_akcipher_sync_prep(&data) ?: crypto_akcipher_sync_post(&data, crypto_akcipher_encrypt(data.req));}EXPORT_SYMBOL_GPL(crypto_akcipher_sync_encrypt);
int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm, const void *src, unsigned int slen, void *dst, unsigned int dlen){ struct crypto_akcipher_sync_data data = { .tfm = tfm, .src = src, .dst = dst, .slen = slen, .dlen = dlen, };
return crypto_akcipher_sync_prep(&data) ?: crypto_akcipher_sync_post(&data, crypto_akcipher_decrypt(data.req)) ?: data.dlen;}EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Generic public key cipher type");