102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
|
/*
|
||
|
|
* 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/algapi.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>
|
||
|
|
|
||
|
|
static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
|
||
|
|
unsigned int keylen)
|
||
|
|
{
|
||
|
|
struct aead_alg *aead = crypto_aead_alg(tfm);
|
||
|
|
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 = aead->setkey(tfm, alignbuffer, keylen);
|
||
|
|
memset(alignbuffer, 0, keylen);
|
||
|
|
kfree(buffer);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
|
||
|
|
{
|
||
|
|
struct aead_alg *aead = crypto_aead_alg(tfm);
|
||
|
|
unsigned long alignmask = crypto_aead_alignmask(tfm);
|
||
|
|
|
||
|
|
if ((unsigned long)key & alignmask)
|
||
|
|
return setkey_unaligned(tfm, key, keylen);
|
||
|
|
|
||
|
|
return aead->setkey(tfm, key, keylen);
|
||
|
|
}
|
||
|
|
|
||
|
|
static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
|
||
|
|
u32 mask)
|
||
|
|
{
|
||
|
|
return alg->cra_ctxsize;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
|
||
|
|
{
|
||
|
|
struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
|
||
|
|
struct aead_tfm *crt = &tfm->crt_aead;
|
||
|
|
|
||
|
|
if (max(alg->authsize, alg->ivsize) > PAGE_SIZE / 8)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
crt->setkey = setkey;
|
||
|
|
crt->encrypt = alg->encrypt;
|
||
|
|
crt->decrypt = alg->decrypt;
|
||
|
|
crt->ivsize = alg->ivsize;
|
||
|
|
crt->authsize = alg->authsize;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
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 = &alg->cra_aead;
|
||
|
|
|
||
|
|
seq_printf(m, "type : aead\n");
|
||
|
|
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
|
||
|
|
seq_printf(m, "ivsize : %u\n", aead->ivsize);
|
||
|
|
seq_printf(m, "authsize : %u\n", aead->authsize);
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct crypto_type crypto_aead_type = {
|
||
|
|
.ctxsize = crypto_aead_ctxsize,
|
||
|
|
.init = crypto_init_aead_ops,
|
||
|
|
#ifdef CONFIG_PROC_FS
|
||
|
|
.show = crypto_aead_show,
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
EXPORT_SYMBOL_GPL(crypto_aead_type);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
|