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![Eric Biggers](/assets/img/avatar_default.png)
The flag CRYPTO_ALG_ASYNC is "inherited" in the sense that when a template is instantiated, the template will have CRYPTO_ALG_ASYNC set if any of the algorithms it uses has CRYPTO_ALG_ASYNC set. We'd like to add a second flag (CRYPTO_ALG_ALLOCATES_MEMORY) that gets "inherited" in the same way. This is difficult because the handling of CRYPTO_ALG_ASYNC is hardcoded everywhere. Address this by: - Add CRYPTO_ALG_INHERITED_FLAGS, which contains the set of flags that have these inheritance semantics. - Add crypto_algt_inherited_mask(), for use by template ->create() methods. It returns any of these flags that the user asked to be unset and thus must be passed in the 'mask' to crypto_grab_*(). - Also modify crypto_check_attr_type() to handle computing the 'mask' so that most templates can just use this. - Make crypto_grab_*() propagate these flags to the template instance being created so that templates don't have to do this themselves. Make crypto/simd.c propagate these flags too, since it "wraps" another algorithm, similar to a template. Based on a patch by Mikulas Patocka <mpatocka@redhat.com> (https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
163 lines
3.8 KiB
C
163 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* geniv: Shared IV generator code
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*
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* This file provides common code to IV generators such as seqiv.
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*
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* Copyright (c) 2007-2019 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/internal/geniv.h>
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#include <crypto/internal/rng.h>
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#include <crypto/null.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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static int aead_geniv_setkey(struct crypto_aead *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
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return crypto_aead_setkey(ctx->child, key, keylen);
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}
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static int aead_geniv_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
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return crypto_aead_setauthsize(ctx->child, authsize);
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}
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static void aead_geniv_free(struct aead_instance *inst)
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{
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crypto_drop_aead(aead_instance_ctx(inst));
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kfree(inst);
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}
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struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
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struct rtattr **tb)
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{
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struct crypto_aead_spawn *spawn;
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struct aead_instance *inst;
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struct aead_alg *alg;
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unsigned int ivsize;
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unsigned int maxauthsize;
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u32 mask;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
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if (err)
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return ERR_PTR(err);
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inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
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if (!inst)
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return ERR_PTR(-ENOMEM);
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spawn = aead_instance_ctx(inst);
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err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
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crypto_attr_alg_name(tb[1]), 0, mask);
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if (err)
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goto err_free_inst;
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alg = crypto_spawn_aead_alg(spawn);
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ivsize = crypto_aead_alg_ivsize(alg);
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maxauthsize = crypto_aead_alg_maxauthsize(alg);
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err = -EINVAL;
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if (ivsize < sizeof(u64))
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goto err_free_inst;
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
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"%s(%s)", tmpl->name, alg->base.cra_name) >=
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CRYPTO_MAX_ALG_NAME)
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goto err_free_inst;
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if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
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CRYPTO_MAX_ALG_NAME)
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goto err_free_inst;
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inst->alg.base.cra_priority = alg->base.cra_priority;
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inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
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inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
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inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
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inst->alg.setkey = aead_geniv_setkey;
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inst->alg.setauthsize = aead_geniv_setauthsize;
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inst->alg.ivsize = ivsize;
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inst->alg.maxauthsize = maxauthsize;
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inst->free = aead_geniv_free;
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out:
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return inst;
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err_free_inst:
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aead_geniv_free(inst);
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inst = ERR_PTR(err);
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goto out;
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}
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EXPORT_SYMBOL_GPL(aead_geniv_alloc);
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int aead_init_geniv(struct crypto_aead *aead)
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{
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
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struct aead_instance *inst = aead_alg_instance(aead);
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struct crypto_aead *child;
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int err;
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spin_lock_init(&ctx->lock);
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err = crypto_get_default_rng();
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if (err)
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goto out;
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err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
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crypto_aead_ivsize(aead));
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crypto_put_default_rng();
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if (err)
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goto out;
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ctx->sknull = crypto_get_default_null_skcipher();
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err = PTR_ERR(ctx->sknull);
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if (IS_ERR(ctx->sknull))
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goto out;
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child = crypto_spawn_aead(aead_instance_ctx(inst));
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err = PTR_ERR(child);
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if (IS_ERR(child))
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goto drop_null;
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ctx->child = child;
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crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
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sizeof(struct aead_request));
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err = 0;
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out:
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return err;
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drop_null:
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crypto_put_default_null_skcipher();
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goto out;
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}
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EXPORT_SYMBOL_GPL(aead_init_geniv);
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void aead_exit_geniv(struct crypto_aead *tfm)
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{
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
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crypto_free_aead(ctx->child);
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crypto_put_default_null_skcipher();
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}
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EXPORT_SYMBOL_GPL(aead_exit_geniv);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Shared IV generator code");
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