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163 lines
3.8 KiB
163 lines
3.8 KiB
// 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 <[email protected]> |
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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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