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- // 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 <[email protected]>
- */
- #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");
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