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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145// 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 <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;
err = crypto_stdrng_get_bytes(ctx->salt, crypto_aead_ivsize(aead)); if (err) goto out;
child = crypto_spawn_aead(aead_instance_ctx(inst)); err = PTR_ERR(child); if (IS_ERR(child)) goto out;
ctx->child = child; crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) + sizeof(struct aead_request));
err = 0;
out: return err;}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);}EXPORT_SYMBOL_GPL(aead_exit_geniv);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Shared IV generator code");