mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Eric Biggers](/assets/img/avatar_default.png)
Convert the "seqiv" template to the new way of freeing instances where a ->free() method is installed to the instance struct itself. Also remove the unused implementation of the old way of freeing instances from the "echainiv" template, since it's already using the new way too. In doing this, also simplify the code by making the helper function aead_geniv_alloc() install the ->free() method, instead of making seqiv and echainiv do this themselves. This is analogous to how skcipher_alloc_instance_simple() works. This will allow removing support for the old way of freeing instances. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
202 lines
4.8 KiB
C
202 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* seqiv: Sequence Number IV Generator
|
|
*
|
|
* This generator generates an IV based on a sequence number by xoring it
|
|
* with a salt. This algorithm is mainly useful for CTR and similar modes.
|
|
*
|
|
* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*/
|
|
|
|
#include <crypto/internal/geniv.h>
|
|
#include <crypto/scatterwalk.h>
|
|
#include <crypto/skcipher.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
|
|
static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err)
|
|
{
|
|
struct aead_request *subreq = aead_request_ctx(req);
|
|
struct crypto_aead *geniv;
|
|
|
|
if (err == -EINPROGRESS)
|
|
return;
|
|
|
|
if (err)
|
|
goto out;
|
|
|
|
geniv = crypto_aead_reqtfm(req);
|
|
memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv));
|
|
|
|
out:
|
|
kzfree(subreq->iv);
|
|
}
|
|
|
|
static void seqiv_aead_encrypt_complete(struct crypto_async_request *base,
|
|
int err)
|
|
{
|
|
struct aead_request *req = base->data;
|
|
|
|
seqiv_aead_encrypt_complete2(req, err);
|
|
aead_request_complete(req, err);
|
|
}
|
|
|
|
static int seqiv_aead_encrypt(struct aead_request *req)
|
|
{
|
|
struct crypto_aead *geniv = crypto_aead_reqtfm(req);
|
|
struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
|
|
struct aead_request *subreq = aead_request_ctx(req);
|
|
crypto_completion_t compl;
|
|
void *data;
|
|
u8 *info;
|
|
unsigned int ivsize = 8;
|
|
int err;
|
|
|
|
if (req->cryptlen < ivsize)
|
|
return -EINVAL;
|
|
|
|
aead_request_set_tfm(subreq, ctx->child);
|
|
|
|
compl = req->base.complete;
|
|
data = req->base.data;
|
|
info = req->iv;
|
|
|
|
if (req->src != req->dst) {
|
|
SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->sknull);
|
|
|
|
skcipher_request_set_sync_tfm(nreq, ctx->sknull);
|
|
skcipher_request_set_callback(nreq, req->base.flags,
|
|
NULL, NULL);
|
|
skcipher_request_set_crypt(nreq, req->src, req->dst,
|
|
req->assoclen + req->cryptlen,
|
|
NULL);
|
|
|
|
err = crypto_skcipher_encrypt(nreq);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (unlikely(!IS_ALIGNED((unsigned long)info,
|
|
crypto_aead_alignmask(geniv) + 1))) {
|
|
info = kmemdup(req->iv, ivsize, req->base.flags &
|
|
CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
|
|
GFP_ATOMIC);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
compl = seqiv_aead_encrypt_complete;
|
|
data = req;
|
|
}
|
|
|
|
aead_request_set_callback(subreq, req->base.flags, compl, data);
|
|
aead_request_set_crypt(subreq, req->dst, req->dst,
|
|
req->cryptlen - ivsize, info);
|
|
aead_request_set_ad(subreq, req->assoclen + ivsize);
|
|
|
|
crypto_xor(info, ctx->salt, ivsize);
|
|
scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);
|
|
|
|
err = crypto_aead_encrypt(subreq);
|
|
if (unlikely(info != req->iv))
|
|
seqiv_aead_encrypt_complete2(req, err);
|
|
return err;
|
|
}
|
|
|
|
static int seqiv_aead_decrypt(struct aead_request *req)
|
|
{
|
|
struct crypto_aead *geniv = crypto_aead_reqtfm(req);
|
|
struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
|
|
struct aead_request *subreq = aead_request_ctx(req);
|
|
crypto_completion_t compl;
|
|
void *data;
|
|
unsigned int ivsize = 8;
|
|
|
|
if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
|
|
return -EINVAL;
|
|
|
|
aead_request_set_tfm(subreq, ctx->child);
|
|
|
|
compl = req->base.complete;
|
|
data = req->base.data;
|
|
|
|
aead_request_set_callback(subreq, req->base.flags, compl, data);
|
|
aead_request_set_crypt(subreq, req->src, req->dst,
|
|
req->cryptlen - ivsize, req->iv);
|
|
aead_request_set_ad(subreq, req->assoclen + ivsize);
|
|
|
|
scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
|
|
|
|
return crypto_aead_decrypt(subreq);
|
|
}
|
|
|
|
static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb)
|
|
{
|
|
struct aead_instance *inst;
|
|
int err;
|
|
|
|
inst = aead_geniv_alloc(tmpl, tb, 0, 0);
|
|
|
|
if (IS_ERR(inst))
|
|
return PTR_ERR(inst);
|
|
|
|
err = -EINVAL;
|
|
if (inst->alg.ivsize != sizeof(u64))
|
|
goto free_inst;
|
|
|
|
inst->alg.encrypt = seqiv_aead_encrypt;
|
|
inst->alg.decrypt = seqiv_aead_decrypt;
|
|
|
|
inst->alg.init = aead_init_geniv;
|
|
inst->alg.exit = aead_exit_geniv;
|
|
|
|
inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
|
|
inst->alg.base.cra_ctxsize += inst->alg.ivsize;
|
|
|
|
err = aead_register_instance(tmpl, inst);
|
|
if (err) {
|
|
free_inst:
|
|
inst->free(inst);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int seqiv_create(struct crypto_template *tmpl, struct rtattr **tb)
|
|
{
|
|
struct crypto_attr_type *algt;
|
|
|
|
algt = crypto_get_attr_type(tb);
|
|
if (IS_ERR(algt))
|
|
return PTR_ERR(algt);
|
|
|
|
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
|
|
return -EINVAL;
|
|
|
|
return seqiv_aead_create(tmpl, tb);
|
|
}
|
|
|
|
static struct crypto_template seqiv_tmpl = {
|
|
.name = "seqiv",
|
|
.create = seqiv_create,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init seqiv_module_init(void)
|
|
{
|
|
return crypto_register_template(&seqiv_tmpl);
|
|
}
|
|
|
|
static void __exit seqiv_module_exit(void)
|
|
{
|
|
crypto_unregister_template(&seqiv_tmpl);
|
|
}
|
|
|
|
subsys_initcall(seqiv_module_init);
|
|
module_exit(seqiv_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Sequence Number IV Generator");
|
|
MODULE_ALIAS_CRYPTO("seqiv");
|