/*
* AEAD: Authenticated Encryption with Associated Data
*
* This file provides API support for AEAD algorithms.
*
* Copyright (c) 2007 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/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>
#include "internal.h"
struct compat_request_ctx {
struct scatterlist src[2];
struct scatterlist dst[2];
struct scatterlist ivbuf[2];
struct scatterlist *ivsg;
struct aead_givcrypt_request subreq;
};
static int aead_null_givencrypt(struct aead_givcrypt_request *req);
static int aead_null_givdecrypt(struct aead_givcrypt_request *req);
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 = tfm->setkey(tfm, alignbuffer, keylen);
memset(alignbuffer, 0, keylen);
kfree(buffer);
return ret;
}
int crypto_aead_setkey(struct crypto_aead *tfm,
const u8 *key, unsigned int keylen)
{
unsigned long alignmask = crypto_aead_alignmask(tfm);
tfm = tfm->child;
if ((unsigned long)key & alignmask)
return setkey_unaligned(tfm, key, keylen);
return tfm->setkey(tfm, key, keylen);
}
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 (tfm->setauthsize) {
err = tfm->setauthsize(tfm->child, authsize);
if (err)
return err;
}
tfm->child->authsize = authsize;
tfm->authsize = authsize;
return 0;
}
EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
struct aead_old_request {
struct scatterlist srcbuf[2];
struct scatterlist dstbuf[2];
struct aead_request subreq;
};
unsigned int crypto_aead_reqsize(struct crypto_aead *tfm)
{
return tfm->reqsize + sizeof(struct aead_old_request);
}
EXPORT_SYMBOL_GPL(crypto_aead_reqsize);
static int old_crypt(struct aead_request *req,
int (*crypt)(struct aead_request *req))
{
struct aead_old_request *nreq = aead_request_ctx(req);
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct scatterlist *src, *dst;
if (req->old)
return crypt(req);
src = scatterwalk_ffwd(nreq->srcbuf, req->src, req->assoclen);
dst = req->src == req->dst ?
src : scatterwalk_ffwd(nreq->dstbuf, req->dst, req->assoclen);
aead_request_set_tfm(&nreq->subreq, aead);
aead_request_set_callback(&nreq->subreq, aead_request_flags(req),
req->base.complete, req->base.data);
aead_request_set_crypt(&nreq->subreq, src, dst, req->cryptlen,
req->iv);
aead_request_set_assoc(&nreq->subreq, req->src, req->assoclen);
return crypt(&nreq->subreq);
}
static int old_encrypt(struct aead_request *req)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct old_aead_alg *alg = crypto_old_aead_alg(aead);
return old_crypt(req, alg->encrypt);
}
static int old_decrypt(struct aead_request *req)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct old_aead_alg *alg = crypto_old_aead_alg(aead);
return old_crypt(req, alg->decrypt);
}
static