// SPDX-License-Identifier: GPL-2.0-or-later /* * 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> */ #include <crypto/internal/aead.h> #include <linux/cryptouser.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/seq_file.h> #include <linux/string.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); kfree_sensitive(buffer); return ret; } int crypto_aead_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen) { unsigned long alignmask = crypto_aead_alignmask(tfm); int err; if ((unsigned long)key & alignmask) err = setkey_unaligned(tfm, key, keylen); else err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen); if (unlikely(err)) { crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY); return err; } crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); return 0; } 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)) || 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; } EXPORT_SYMBOL_GPL(crypto_aead_setauthsize); int crypto_aead_encrypt(struct aead_request *req) { struct crypto_aead *aead = crypto_aead_reqtfm(req); if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY) return -ENOKEY; return crypto_aead_alg(aead)->encrypt(req); } EXPORT_SYMBOL_GPL(crypto_aead_encrypt); int crypto_aead_decrypt(struct aead_request *req) { struct crypto_aead *aead = crypto_aead_reqtfm(req); if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY) return -ENOKEY; if (req->cryptlen < crypto_aead_authsize(aead)) return -EINVAL; return crypto_aead_alg(aead)->decrypt(req); } EXPORT_SYMBOL_GPL(crypto_aead_decrypt); 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); } 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); crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY); aead->authsize = alg->maxauthsize; if (alg->exit) aead->base.exit = crypto_aead_exit_tfm; if (alg->init) return alg->init(aead); return 0; } static int __maybe_unused 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); memset(&raead, 0, sizeof(raead)); strscpy(raead.type, "aead", sizeof(raead.type)); strscpy(raead.geniv, "<none>", sizeof(raead.geniv)); raead.blocksize = alg->cra_blocksize; raead.maxauthsize = aead->maxauthsize; raead.ivsize = aead->ivsize; return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead); } static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) __maybe_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"); } static void crypto_aead_free_instance(struct crypto_instance *inst) { struct aead_instance *aead = aead_instance(inst); aead->free(aead); } 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 #if IS_ENABLED(CONFIG_CRYPTO_USER) .report = crypto_aead_report, #endif .maskclear = ~CRYPTO_ALG_TYPE_MASK, .maskset = CRYPTO_ALG_TYPE_MASK, .type = CRYPTO_ALG_TYPE_AEAD, .tfmsize = offsetof(struct crypto_aead, base), }; int crypto_grab_aead(struct crypto_aead_spawn *spawn, struct crypto_instance *inst, const char *name, u32 type, u32 mask) { spawn->base.frontend = &crypto_aead_type; return crypto_grab_spawn(&spawn->base, inst, name, type, mask); } 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); } EXPORT_SYMBOL_GPL(crypto_alloc_aead); int crypto_has_aead(const char *alg_name, u32 type, u32 mask) { return crypto_type_has_alg(alg_name, &crypto_aead_type, type, mask); } EXPORT_SYMBOL_GPL(crypto_has_aead); static int aead_prepare_alg(struct aead_alg *alg) { struct crypto_alg *base = &alg->base; if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) > PAGE_SIZE / 8) return -EINVAL; if (!alg->chunksize) alg->chunksize = base->cra_blocksize; base->cra_type = &crypto_aead_type; base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; base->cra_flags |= CRYPTO_ALG_TYPE_AEAD; return 0; } 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); } EXPORT_SYMBOL_GPL(crypto_register_aead); void crypto_unregister_aead(struct aead_alg *alg) { crypto_unregister_alg(&alg->base); } 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; } 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]); } EXPORT_SYMBOL_GPL(crypto_unregister_aeads); int aead_register_instance(struct crypto_template *tmpl, struct aead_instance *inst) { int err; if (WARN_ON(!inst->free)) return -EINVAL; err = aead_prepare_alg(&inst->alg); if (err) return err; return crypto_register_instance(tmpl, aead_crypto_instance(inst)); } EXPORT_SYMBOL_GPL(aead_register_instance); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");