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![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>
177 lines
4.2 KiB
C
177 lines
4.2 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, u32 type, u32 mask)
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{
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const char *name;
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struct crypto_aead_spawn *spawn;
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struct crypto_attr_type *algt;
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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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int err;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return ERR_CAST(algt);
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if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
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return ERR_PTR(-EINVAL);
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name = crypto_attr_alg_name(tb[1]);
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if (IS_ERR(name))
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return ERR_CAST(name);
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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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/* Ignore async algorithms if necessary. */
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mask |= crypto_requires_sync(algt->type, algt->mask);
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err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
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name, type, 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_drop_alg;
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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_drop_alg;
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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_drop_alg;
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inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
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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_drop_alg:
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crypto_drop_aead(spawn);
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err_free_inst:
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kfree(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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