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