164 lines
3.8 KiB
C
164 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* geniv: Shared IV generator code
|
|
*
|
|
* This file provides common code to IV generators such as seqiv.
|
|
*
|
|
* Copyright (c) 2007-2019 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*/
|
|
|
|
#include <crypto/internal/geniv.h>
|
|
#include <crypto/internal/rng.h>
|
|
#include <crypto/null.h>
|
|
#include <linux/err.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/slab.h>
|
|
|
|
static int aead_geniv_setkey(struct crypto_aead *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
|
|
|
|
return crypto_aead_setkey(ctx->child, key, keylen);
|
|
}
|
|
|
|
static int aead_geniv_setauthsize(struct crypto_aead *tfm,
|
|
unsigned int authsize)
|
|
{
|
|
struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
|
|
|
|
return crypto_aead_setauthsize(ctx->child, authsize);
|
|
}
|
|
|
|
static void aead_geniv_free(struct aead_instance *inst)
|
|
{
|
|
crypto_drop_aead(aead_instance_ctx(inst));
|
|
kfree(inst);
|
|
}
|
|
|
|
struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
|
|
struct rtattr **tb)
|
|
{
|
|
struct crypto_aead_spawn *spawn;
|
|
struct aead_instance *inst;
|
|
struct aead_alg *alg;
|
|
unsigned int ivsize;
|
|
unsigned int maxauthsize;
|
|
u32 mask;
|
|
int err;
|
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
spawn = aead_instance_ctx(inst);
|
|
|
|
err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
|
|
crypto_attr_alg_name(tb[1]), 0, mask);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
alg = crypto_spawn_aead_alg(spawn);
|
|
|
|
ivsize = crypto_aead_alg_ivsize(alg);
|
|
maxauthsize = crypto_aead_alg_maxauthsize(alg);
|
|
|
|
err = -EINVAL;
|
|
if (ivsize < sizeof(u64))
|
|
goto err_free_inst;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"%s(%s)", tmpl->name, alg->base.cra_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
|
"%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
inst->alg.base.cra_priority = alg->base.cra_priority;
|
|
inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
|
|
inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
|
|
inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
|
|
|
|
inst->alg.setkey = aead_geniv_setkey;
|
|
inst->alg.setauthsize = aead_geniv_setauthsize;
|
|
|
|
inst->alg.ivsize = ivsize;
|
|
inst->alg.maxauthsize = maxauthsize;
|
|
|
|
inst->free = aead_geniv_free;
|
|
|
|
out:
|
|
return inst;
|
|
|
|
err_free_inst:
|
|
aead_geniv_free(inst);
|
|
inst = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(aead_geniv_alloc);
|
|
|
|
int aead_init_geniv(struct crypto_aead *aead)
|
|
{
|
|
struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
|
|
struct aead_instance *inst = aead_alg_instance(aead);
|
|
struct crypto_aead *child;
|
|
int err;
|
|
|
|
spin_lock_init(&ctx->lock);
|
|
|
|
err = crypto_get_default_rng();
|
|
if (err)
|
|
goto out;
|
|
|
|
err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
|
|
crypto_aead_ivsize(aead));
|
|
crypto_put_default_rng();
|
|
if (err)
|
|
goto out;
|
|
|
|
ctx->sknull = crypto_get_default_null_skcipher();
|
|
err = PTR_ERR(ctx->sknull);
|
|
if (IS_ERR(ctx->sknull))
|
|
goto out;
|
|
|
|
child = crypto_spawn_aead(aead_instance_ctx(inst));
|
|
err = PTR_ERR(child);
|
|
if (IS_ERR(child))
|
|
goto drop_null;
|
|
|
|
ctx->child = child;
|
|
crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
|
|
sizeof(struct aead_request));
|
|
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
|
|
drop_null:
|
|
crypto_put_default_null_skcipher();
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(aead_init_geniv);
|
|
|
|
void aead_exit_geniv(struct crypto_aead *tfm)
|
|
{
|
|
struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
|
|
|
|
crypto_free_aead(ctx->child);
|
|
crypto_put_default_null_skcipher();
|
|
}
|
|
EXPORT_SYMBOL_GPL(aead_exit_geniv);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Shared IV generator code");
|