cregit-Linux how code gets into the kernel

Release 4.7 crypto/aead.c

Directory: crypto
/*
 * AEAD: Authenticated Encryption with Associated Data
 *
 * This file provides API support for AEAD algorithms.
 *
 * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/internal/geniv.h>
#include <crypto/internal/rng.h>
#include <crypto/null.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>

#include "internal.h"


static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key, unsigned int keylen) { unsigned long alignmask = crypto_aead_alignmask(tfm); int ret; u8 *buffer, *alignbuffer; unsigned long absize; absize = keylen + alignmask; buffer = kmalloc(absize, GFP_ATOMIC); if (!buffer) return -ENOMEM; alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); memcpy(alignbuffer, key, keylen); ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen); memset(alignbuffer, 0, keylen); kfree(buffer); return ret; }

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int crypto_aead_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen) { unsigned long alignmask = crypto_aead_alignmask(tfm); if ((unsigned long)key & alignmask) return setkey_unaligned(tfm, key, keylen); return crypto_aead_alg(tfm)->setkey(tfm, key, keylen); }

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EXPORT_SYMBOL_GPL(crypto_aead_setkey);
int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize) { int err; if (authsize > crypto_aead_maxauthsize(tfm)) return -EINVAL; if (crypto_aead_alg(tfm)->setauthsize) { err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize); if (err) return err; } tfm->authsize = authsize; return 0; }

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EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
static void crypto_aead_exit_tfm(struct crypto_tfm *tfm) { struct crypto_aead *aead = __crypto_aead_cast(tfm); struct aead_alg *alg = crypto_aead_alg(aead); alg->exit(aead); }

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static int crypto_aead_init_tfm(struct crypto_tfm *tfm) { struct crypto_aead *aead = __crypto_aead_cast(tfm); struct aead_alg *alg = crypto_aead_alg(aead); aead->authsize = alg->maxauthsize; if (alg->exit) aead->base.exit = crypto_aead_exit_tfm; if (alg->init) return alg->init(aead); return 0; }

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#ifdef CONFIG_NET
static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_aead raead; struct aead_alg *aead = container_of(alg, struct aead_alg, base); strncpy(raead.type, "aead", sizeof(raead.type)); strncpy(raead.geniv, "<none>", sizeof(raead.geniv)); raead.blocksize = alg->cra_blocksize; raead.maxauthsize = aead->maxauthsize; raead.ivsize = aead->ivsize; if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(struct crypto_report_aead), &raead)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; }

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#else
static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) { return -ENOSYS; }

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#endif static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) __attribute__ ((unused));
static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) { struct aead_alg *aead = container_of(alg, struct aead_alg, base); seq_printf(m, "type : aead\n"); seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); seq_printf(m, "ivsize : %u\n", aead->ivsize); seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); seq_printf(m, "geniv : <none>\n"); }

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static void crypto_aead_free_instance(struct crypto_instance *inst) { struct aead_instance *aead = aead_instance(inst); if (!aead->free) { inst->tmpl->free(inst); return; } aead->free(aead); }

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static const struct crypto_type crypto_aead_type = { .extsize = crypto_alg_extsize, .init_tfm = crypto_aead_init_tfm, .free = crypto_aead_free_instance, #ifdef CONFIG_PROC_FS .show = crypto_aead_show, #endif .report = crypto_aead_report, .maskclear = ~CRYPTO_ALG_TYPE_MASK, .maskset = CRYPTO_ALG_TYPE_MASK, .type = CRYPTO_ALG_TYPE_AEAD, .tfmsize = offsetof(struct crypto_aead, base), };
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); }

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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); }

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struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl, struct rtattr **tb, u32 type, u32 mask) { const char *name; struct crypto_aead_spawn *spawn; struct crypto_attr_type *algt; struct aead_instance *inst; struct aead_alg *alg; unsigned int ivsize; unsigned int maxauthsize; int err; algt = crypto_get_attr_type(tb); if (IS_ERR(algt)) return ERR_CAST(algt); if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) return ERR_PTR(-EINVAL); name = crypto_attr_alg_name(tb[1]); if (IS_ERR(name)) return ERR_CAST(name); inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) return ERR_PTR(-ENOMEM); spawn = aead_instance_ctx(inst); /* Ignore async algorithms if necessary. */ mask |= crypto_requires_sync(algt->type, algt->mask); crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); err = crypto_grab_aead(spawn, name, type, 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_drop_alg; 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_drop_alg; 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_drop_alg; inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; 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; out: return inst; err_drop_alg: crypto_drop_aead(spawn); err_free_inst: kfree(inst); inst = ERR_PTR(err); goto out; }

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EXPORT_SYMBOL_GPL(aead_geniv_alloc);
void aead_geniv_free(struct aead_instance *inst) { crypto_drop_aead(aead_instance_ctx(inst)); kfree(inst); }

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EXPORT_SYMBOL_GPL(aead_geniv_free);
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->null = crypto_get_default_null_skcipher(); err = PTR_ERR(ctx->null); if (IS_ERR(ctx->null)) 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; }

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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(); }

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EXPORT_SYMBOL_GPL(aead_exit_geniv);
int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name, u32 type, u32 mask) { spawn->base.frontend = &crypto_aead_type; return crypto_grab_spawn(&spawn->base, name, type, mask); }

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EXPORT_SYMBOL_GPL(crypto_grab_aead);
struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask) { return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask); }

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EXPORT_SYMBOL_GPL(crypto_alloc_aead);
static int aead_prepare_alg(struct aead_alg *alg) { struct crypto_alg *base = &alg->base; if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8) return -EINVAL; base->cra_type = &crypto_aead_type; base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; base->cra_flags |= CRYPTO_ALG_TYPE_AEAD; return 0; }

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int crypto_register_aead(struct aead_alg *alg) { struct crypto_alg *base = &alg->base; int err; err = aead_prepare_alg(alg); if (err) return err; return crypto_register_alg(base); }

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EXPORT_SYMBOL_GPL(crypto_register_aead);
void crypto_unregister_aead(struct aead_alg *alg) { crypto_unregister_alg(&alg->base); }

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EXPORT_SYMBOL_GPL(crypto_unregister_aead);
int crypto_register_aeads(struct aead_alg *algs, int count) { int i, ret; for (i = 0; i < count; i++) { ret = crypto_register_aead(&algs[i]); if (ret) goto err; } return 0; err: for (--i; i >= 0; --i) crypto_unregister_aead(&algs[i]); return ret; }

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EXPORT_SYMBOL_GPL(crypto_register_aeads);
void crypto_unregister_aeads(struct aead_alg *algs, int count) { int i; for (i = count - 1; i >= 0; --i) crypto_unregister_aead(&algs[i]); }

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EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
int aead_register_instance(struct crypto_template *tmpl, struct aead_instance *inst) { int err; err = aead_prepare_alg(&inst->alg); if (err) return err; return crypto_register_instance(tmpl, aead_crypto_instance(inst)); }

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EXPORT_SYMBOL_GPL(aead_register_instance); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");

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Total1984100.00%20100.00%
Directory: crypto
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