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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * AEAD: Authenticated Encryption with Associated Data
- *
- * This file provides API support for AEAD algorithms.
- *
- * Copyright (c) 2007-2015 Herbert Xu <[email protected]>
- */
- #include <crypto/internal/aead.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/seq_file.h>
- #include <linux/cryptouser.h>
- #include <net/netlink.h>
- #include "internal.h"
- static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
- unsigned int keylen)
- {
- unsigned long alignmask = crypto_aead_alignmask(tfm);
- int ret;
- u8 *buffer, *alignbuffer;
- unsigned long absize;
- absize = keylen + alignmask;
- buffer = kmalloc(absize, GFP_ATOMIC);
- if (!buffer)
- return -ENOMEM;
- alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
- memcpy(alignbuffer, key, keylen);
- ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
- memset(alignbuffer, 0, keylen);
- kfree(buffer);
- return ret;
- }
- int crypto_aead_setkey(struct crypto_aead *tfm,
- const u8 *key, unsigned int keylen)
- {
- unsigned long alignmask = crypto_aead_alignmask(tfm);
- int err;
- if ((unsigned long)key & alignmask)
- err = setkey_unaligned(tfm, key, keylen);
- else
- err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
- if (unlikely(err)) {
- crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
- return err;
- }
- crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
- return 0;
- }
- EXPORT_SYMBOL_GPL(crypto_aead_setkey);
- int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
- {
- int err;
- if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
- authsize > crypto_aead_maxauthsize(tfm))
- return -EINVAL;
- if (crypto_aead_alg(tfm)->setauthsize) {
- err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
- if (err)
- return err;
- }
- tfm->authsize = authsize;
- return 0;
- }
- EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
- int crypto_aead_encrypt(struct aead_request *req)
- {
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_alg *alg = aead->base.__crt_alg;
- unsigned int cryptlen = req->cryptlen;
- int ret;
- crypto_stats_get(alg);
- if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
- ret = -ENOKEY;
- else
- ret = crypto_aead_alg(aead)->encrypt(req);
- crypto_stats_aead_encrypt(cryptlen, alg, ret);
- return ret;
- }
- EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
- int crypto_aead_decrypt(struct aead_request *req)
- {
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_alg *alg = aead->base.__crt_alg;
- unsigned int cryptlen = req->cryptlen;
- int ret;
- crypto_stats_get(alg);
- if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
- ret = -ENOKEY;
- else if (req->cryptlen < crypto_aead_authsize(aead))
- ret = -EINVAL;
- else
- ret = crypto_aead_alg(aead)->decrypt(req);
- crypto_stats_aead_decrypt(cryptlen, alg, ret);
- return ret;
- }
- EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
- static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
- {
- struct crypto_aead *aead = __crypto_aead_cast(tfm);
- struct aead_alg *alg = crypto_aead_alg(aead);
- alg->exit(aead);
- }
- static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
- {
- struct crypto_aead *aead = __crypto_aead_cast(tfm);
- struct aead_alg *alg = crypto_aead_alg(aead);
- crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
- aead->authsize = alg->maxauthsize;
- if (alg->exit)
- aead->base.exit = crypto_aead_exit_tfm;
- if (alg->init)
- return alg->init(aead);
- return 0;
- }
- #ifdef CONFIG_NET
- static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
- {
- struct crypto_report_aead raead;
- struct aead_alg *aead = container_of(alg, struct aead_alg, base);
- memset(&raead, 0, sizeof(raead));
- strscpy(raead.type, "aead", sizeof(raead.type));
- strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
- raead.blocksize = alg->cra_blocksize;
- raead.maxauthsize = aead->maxauthsize;
- raead.ivsize = aead->ivsize;
- return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
- }
- #else
- static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
- {
- return -ENOSYS;
- }
- #endif
- static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
- __maybe_unused;
- static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
- {
- struct aead_alg *aead = container_of(alg, struct aead_alg, base);
- seq_printf(m, "type : aead\n");
- seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
- "yes" : "no");
- seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
- seq_printf(m, "ivsize : %u\n", aead->ivsize);
- seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
- seq_printf(m, "geniv : <none>\n");
- }
- static void crypto_aead_free_instance(struct crypto_instance *inst)
- {
- struct aead_instance *aead = aead_instance(inst);
- aead->free(aead);
- }
- static const struct crypto_type crypto_aead_type = {
- .extsize = crypto_alg_extsize,
- .init_tfm = crypto_aead_init_tfm,
- .free = crypto_aead_free_instance,
- #ifdef CONFIG_PROC_FS
- .show = crypto_aead_show,
- #endif
- .report = crypto_aead_report,
- .maskclear = ~CRYPTO_ALG_TYPE_MASK,
- .maskset = CRYPTO_ALG_TYPE_MASK,
- .type = CRYPTO_ALG_TYPE_AEAD,
- .tfmsize = offsetof(struct crypto_aead, base),
- };
- int crypto_grab_aead(struct crypto_aead_spawn *spawn,
- struct crypto_instance *inst,
- const char *name, u32 type, u32 mask)
- {
- spawn->base.frontend = &crypto_aead_type;
- return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
- }
- EXPORT_SYMBOL_GPL(crypto_grab_aead);
- struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
- {
- return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
- }
- EXPORT_SYMBOL_GPL(crypto_alloc_aead);
- static int aead_prepare_alg(struct aead_alg *alg)
- {
- struct crypto_alg *base = &alg->base;
- if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
- PAGE_SIZE / 8)
- return -EINVAL;
- if (!alg->chunksize)
- alg->chunksize = base->cra_blocksize;
- base->cra_type = &crypto_aead_type;
- base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
- base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
- return 0;
- }
- int crypto_register_aead(struct aead_alg *alg)
- {
- struct crypto_alg *base = &alg->base;
- int err;
- err = aead_prepare_alg(alg);
- if (err)
- return err;
- return crypto_register_alg(base);
- }
- EXPORT_SYMBOL_GPL(crypto_register_aead);
- void crypto_unregister_aead(struct aead_alg *alg)
- {
- crypto_unregister_alg(&alg->base);
- }
- EXPORT_SYMBOL_GPL(crypto_unregister_aead);
- int crypto_register_aeads(struct aead_alg *algs, int count)
- {
- int i, ret;
- for (i = 0; i < count; i++) {
- ret = crypto_register_aead(&algs[i]);
- if (ret)
- goto err;
- }
- return 0;
- err:
- for (--i; i >= 0; --i)
- crypto_unregister_aead(&algs[i]);
- return ret;
- }
- EXPORT_SYMBOL_GPL(crypto_register_aeads);
- void crypto_unregister_aeads(struct aead_alg *algs, int count)
- {
- int i;
- for (i = count - 1; i >= 0; --i)
- crypto_unregister_aead(&algs[i]);
- }
- EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
- int aead_register_instance(struct crypto_template *tmpl,
- struct aead_instance *inst)
- {
- int err;
- if (WARN_ON(!inst->free))
- return -EINVAL;
- err = aead_prepare_alg(&inst->alg);
- if (err)
- return err;
- return crypto_register_instance(tmpl, aead_crypto_instance(inst));
- }
- EXPORT_SYMBOL_GPL(aead_register_instance);
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
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