507 lines
13 KiB
C
507 lines
13 KiB
C
/*
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* AEAD: Authenticated Encryption with Associated Data
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*
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* This file provides API support for AEAD algorithms.
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*
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* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/aead.h>
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#include <linux/err.h>
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#include <linux/init.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/sched.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct aead_alg *aead = crypto_aead_alg(tfm);
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unsigned long alignmask = crypto_aead_alignmask(tfm);
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int ret;
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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absize = keylen + alignmask;
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buffer = kmalloc(absize, GFP_ATOMIC);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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ret = aead->setkey(tfm, alignbuffer, keylen);
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memset(alignbuffer, 0, keylen);
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kfree(buffer);
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return ret;
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}
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static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
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{
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struct aead_alg *aead = crypto_aead_alg(tfm);
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unsigned long alignmask = crypto_aead_alignmask(tfm);
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if ((unsigned long)key & alignmask)
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return setkey_unaligned(tfm, key, keylen);
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return aead->setkey(tfm, key, keylen);
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}
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int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
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{
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struct aead_tfm *crt = crypto_aead_crt(tfm);
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int err;
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if (authsize > crypto_aead_alg(tfm)->maxauthsize)
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return -EINVAL;
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if (crypto_aead_alg(tfm)->setauthsize) {
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err = crypto_aead_alg(tfm)->setauthsize(crt->base, authsize);
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if (err)
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return err;
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}
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crypto_aead_crt(crt->base)->authsize = authsize;
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crt->authsize = authsize;
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
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static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
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u32 mask)
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{
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return alg->cra_ctxsize;
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}
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static int no_givcrypt(struct aead_givcrypt_request *req)
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{
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return -ENOSYS;
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}
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static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
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struct aead_tfm *crt = &tfm->crt_aead;
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if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
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return -EINVAL;
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crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
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alg->setkey : setkey;
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crt->encrypt = alg->encrypt;
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crt->decrypt = alg->decrypt;
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crt->givencrypt = alg->givencrypt ?: no_givcrypt;
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crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
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crt->base = __crypto_aead_cast(tfm);
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crt->ivsize = alg->ivsize;
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crt->authsize = alg->maxauthsize;
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return 0;
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}
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static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
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{
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struct aead_alg *aead = &alg->cra_aead;
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seq_printf(m, "type : aead\n");
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seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"yes" : "no");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "ivsize : %u\n", aead->ivsize);
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seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
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seq_printf(m, "geniv : %s\n", aead->geniv ?: "<built-in>");
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}
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const struct crypto_type crypto_aead_type = {
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.ctxsize = crypto_aead_ctxsize,
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.init = crypto_init_aead_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_aead_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_aead_type);
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static int aead_null_givencrypt(struct aead_givcrypt_request *req)
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{
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return crypto_aead_encrypt(&req->areq);
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}
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static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
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{
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return crypto_aead_decrypt(&req->areq);
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}
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static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
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struct aead_tfm *crt = &tfm->crt_aead;
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if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
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return -EINVAL;
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crt->setkey = setkey;
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crt->encrypt = alg->encrypt;
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crt->decrypt = alg->decrypt;
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if (!alg->ivsize) {
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crt->givencrypt = aead_null_givencrypt;
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crt->givdecrypt = aead_null_givdecrypt;
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}
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crt->base = __crypto_aead_cast(tfm);
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crt->ivsize = alg->ivsize;
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crt->authsize = alg->maxauthsize;
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return 0;
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}
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static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
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{
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struct aead_alg *aead = &alg->cra_aead;
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seq_printf(m, "type : nivaead\n");
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seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"yes" : "no");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "ivsize : %u\n", aead->ivsize);
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seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
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seq_printf(m, "geniv : %s\n", aead->geniv);
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}
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const struct crypto_type crypto_nivaead_type = {
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.ctxsize = crypto_aead_ctxsize,
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.init = crypto_init_nivaead_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_nivaead_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_nivaead_type);
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static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
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const char *name, u32 type, u32 mask)
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{
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struct crypto_alg *alg;
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int err;
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type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
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type |= CRYPTO_ALG_TYPE_AEAD;
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mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV;
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alg = crypto_alg_mod_lookup(name, type, mask);
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if (IS_ERR(alg))
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return PTR_ERR(alg);
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err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
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crypto_mod_put(alg);
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return err;
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}
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struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,
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struct rtattr **tb, u32 type,
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u32 mask)
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{
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const char *name;
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struct crypto_aead_spawn *spawn;
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struct crypto_attr_type *algt;
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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int err;
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algt = crypto_get_attr_type(tb);
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err = PTR_ERR(algt);
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if (IS_ERR(algt))
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return ERR_PTR(err);
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if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
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algt->mask)
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return ERR_PTR(-EINVAL);
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name = crypto_attr_alg_name(tb[1]);
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err = PTR_ERR(name);
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if (IS_ERR(name))
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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 = crypto_instance_ctx(inst);
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/* Ignore async algorithms if necessary. */
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mask |= crypto_requires_sync(algt->type, algt->mask);
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crypto_set_aead_spawn(spawn, inst);
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err = crypto_grab_nivaead(spawn, name, type, mask);
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if (err)
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goto err_free_inst;
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alg = crypto_aead_spawn_alg(spawn);
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err = -EINVAL;
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if (!alg->cra_aead.ivsize)
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goto err_drop_alg;
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/*
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* This is only true if we're constructing an algorithm with its
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* default IV generator. For the default generator we elide the
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* template name and double-check the IV generator.
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*/
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if (algt->mask & CRYPTO_ALG_GENIV) {
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if (strcmp(tmpl->name, alg->cra_aead.geniv))
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goto err_drop_alg;
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memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
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CRYPTO_MAX_ALG_NAME);
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} else {
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
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"%s(%s)", tmpl->name, alg->cra_name) >=
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CRYPTO_MAX_ALG_NAME)
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goto err_drop_alg;
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if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"%s(%s)", tmpl->name, alg->cra_driver_name) >=
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CRYPTO_MAX_ALG_NAME)
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goto err_drop_alg;
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}
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV;
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inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
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inst->alg.cra_priority = alg->cra_priority;
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inst->alg.cra_blocksize = alg->cra_blocksize;
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inst->alg.cra_alignmask = alg->cra_alignmask;
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inst->alg.cra_type = &crypto_aead_type;
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inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
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inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
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inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
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inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
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inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
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inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
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inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;
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out:
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return inst;
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err_drop_alg:
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crypto_drop_aead(spawn);
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err_free_inst:
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kfree(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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void aead_geniv_free(struct crypto_instance *inst)
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{
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crypto_drop_aead(crypto_instance_ctx(inst));
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kfree(inst);
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}
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EXPORT_SYMBOL_GPL(aead_geniv_free);
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int aead_geniv_init(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct crypto_aead *aead;
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aead = crypto_spawn_aead(crypto_instance_ctx(inst));
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if (IS_ERR(aead))
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return PTR_ERR(aead);
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tfm->crt_aead.base = aead;
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tfm->crt_aead.reqsize += crypto_aead_reqsize(aead);
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return 0;
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}
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EXPORT_SYMBOL_GPL(aead_geniv_init);
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void aead_geniv_exit(struct crypto_tfm *tfm)
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{
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crypto_free_aead(tfm->crt_aead.base);
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}
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EXPORT_SYMBOL_GPL(aead_geniv_exit);
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static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
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{
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struct rtattr *tb[3];
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struct {
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struct rtattr attr;
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struct crypto_attr_type data;
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} ptype;
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struct {
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struct rtattr attr;
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struct crypto_attr_alg data;
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} palg;
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struct crypto_template *tmpl;
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struct crypto_instance *inst;
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struct crypto_alg *larval;
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const char *geniv;
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int err;
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larval = crypto_larval_lookup(alg->cra_driver_name,
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CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,
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CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
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err = PTR_ERR(larval);
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if (IS_ERR(larval))
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goto out;
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err = -EAGAIN;
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if (!crypto_is_larval(larval))
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goto drop_larval;
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ptype.attr.rta_len = sizeof(ptype);
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ptype.attr.rta_type = CRYPTOA_TYPE;
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ptype.data.type = type | CRYPTO_ALG_GENIV;
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/* GENIV tells the template that we're making a default geniv. */
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ptype.data.mask = mask | CRYPTO_ALG_GENIV;
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tb[0] = &ptype.attr;
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palg.attr.rta_len = sizeof(palg);
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palg.attr.rta_type = CRYPTOA_ALG;
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/* Must use the exact name to locate ourselves. */
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memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
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tb[1] = &palg.attr;
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tb[2] = NULL;
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geniv = alg->cra_aead.geniv;
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tmpl = crypto_lookup_template(geniv);
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err = -ENOENT;
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if (!tmpl)
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goto kill_larval;
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inst = tmpl->alloc(tb);
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err = PTR_ERR(inst);
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if (IS_ERR(inst))
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goto put_tmpl;
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if ((err = crypto_register_instance(tmpl, inst))) {
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tmpl->free(inst);
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goto put_tmpl;
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}
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/* Redo the lookup to use the instance we just registered. */
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err = -EAGAIN;
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put_tmpl:
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crypto_tmpl_put(tmpl);
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kill_larval:
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crypto_larval_kill(larval);
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drop_larval:
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crypto_mod_put(larval);
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out:
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crypto_mod_put(alg);
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return err;
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}
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static struct crypto_alg *crypto_lookup_aead(const char *name, u32 type,
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u32 mask)
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{
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struct crypto_alg *alg;
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alg = crypto_alg_mod_lookup(name, type, mask);
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if (IS_ERR(alg))
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return alg;
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if (alg->cra_type == &crypto_aead_type)
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return alg;
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if (!alg->cra_aead.ivsize)
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return alg;
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crypto_mod_put(alg);
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alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
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mask & ~CRYPTO_ALG_TESTED);
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if (IS_ERR(alg))
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return alg;
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if (alg->cra_type == &crypto_aead_type) {
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if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
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crypto_mod_put(alg);
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alg = ERR_PTR(-ENOENT);
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}
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return alg;
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}
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BUG_ON(!alg->cra_aead.ivsize);
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return ERR_PTR(crypto_nivaead_default(alg, type, mask));
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}
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int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
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u32 type, u32 mask)
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{
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struct crypto_alg *alg;
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int err;
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type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
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type |= CRYPTO_ALG_TYPE_AEAD;
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mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
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mask |= CRYPTO_ALG_TYPE_MASK;
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alg = crypto_lookup_aead(name, type, mask);
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if (IS_ERR(alg))
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return PTR_ERR(alg);
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err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
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crypto_mod_put(alg);
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_grab_aead);
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struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
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{
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struct crypto_tfm *tfm;
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int err;
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type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
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type |= CRYPTO_ALG_TYPE_AEAD;
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mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
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mask |= CRYPTO_ALG_TYPE_MASK;
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for (;;) {
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struct crypto_alg *alg;
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alg = crypto_lookup_aead(alg_name, type, mask);
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if (IS_ERR(alg)) {
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err = PTR_ERR(alg);
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goto err;
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}
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tfm = __crypto_alloc_tfm(alg, type, mask);
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if (!IS_ERR(tfm))
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return __crypto_aead_cast(tfm);
|
|
|
|
crypto_mod_put(alg);
|
|
err = PTR_ERR(tfm);
|
|
|
|
err:
|
|
if (err != -EAGAIN)
|
|
break;
|
|
if (signal_pending(current)) {
|
|
err = -EINTR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_aead);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
|