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/*
* New driver for /dev/crypto device (aka CryptoDev)
* Copyright (c) 2010 Nikos Mavrogiannopoulos <nmav@gnutls.org>
*
* This file is part of linux cryptodev.
*
* cryptodev 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 3 of the License, or
* (at your option) any later version.
*
* cryptodev is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/mm.h>
#include <linux/random.h>
#include "cryptodev.h"
#include <asm/uaccess.h>
#include <asm/ioctl.h>
#include <linux/scatterlist.h>
#include "ncr.h"
#include "ncr_int.h"
#include <tomcrypt.h>
static int tomerr(int err)
{
switch (err) {
case CRYPT_BUFFER_OVERFLOW:
return -EOVERFLOW;
case CRYPT_MEM:
return -ENOMEM;
default:
return -EINVAL;
}
}
void ncr_pk_clear(struct key_item_st* key)
{
switch(key->algorithm) {
case NCR_ALG_RSA:
rsa_free(&key->key.pk.rsa);
break;
case NCR_ALG_DSA:
dsa_free(&key->key.pk.dsa);
break;
default:
return;
}
}
static int ncr_pk_make_public_and_id( struct key_item_st * private, struct key_item_st * public)
{
uint8_t * tmp;
long max_size;
int ret, cret;
unsigned long key_id_size = MAX_KEY_ID_SIZE;
max_size = KEY_DATA_MAX_SIZE;
tmp = kmalloc(max_size, GFP_KERNEL);
if (tmp == NULL) {
err();
return -ENOMEM;
}
switch(private->algorithm) {
case NCR_ALG_RSA:
cret = rsa_export(tmp, &max_size, PK_PUBLIC, &private->key.pk.rsa);
if (cret != CRYPT_OK) {
err();
ret = tomerr(cret);
goto fail;
}
cret = rsa_import(tmp, max_size, &public->key.pk.rsa);
if (cret != CRYPT_OK) {
err();
ret = tomerr(cret);
goto fail;
}
break;
case NCR_ALG_DSA:
cret = dsa_export(tmp, &max_size, PK_PUBLIC, &private->key.pk.dsa);
if (cret != CRYPT_OK) {
err();
ret = tomerr(cret);
goto fail;
}
cret = dsa_import(tmp, max_size, &public->key.pk.dsa);
if (cret != CRYPT_OK) {
err();
ret = tomerr(cret);
goto fail;
}
break;
default:
err();
ret = -EINVAL;
goto fail;
}
cret = hash_memory(NCR_ALG_SHA1, tmp, max_size, private->key_id, &key_id_size);
if (cret != CRYPT_OK) {
err();
ret = tomerr(cret);
goto fail;
}
private->key_id_size = public->key_id_size = key_id_size;
memcpy(public->key_id, private->key_id, key_id_size);
ret = 0;
fail:
kfree(tmp);
return ret;
}
int ncr_pk_pack( const struct key_item_st * key, uint8_t * packed, uint32_t * packed_size)
{
long max_size = *packed_size;
int cret;
switch(key->algorithm) {
case NCR_ALG_RSA:
cret = rsa_export(packed, &max_size, key->key.pk.rsa.type, (void*)&key->key.pk.rsa);
if (cret != CRYPT_OK) {
*packed_size = max_size;
err();
return tomerr(cret);
}
break;
case NCR_ALG_DSA:
cret = dsa_export(packed, &max_size, key->key.pk.dsa.type, (void*)&key->key.pk.dsa);
if (cret != CRYPT_OK) {
*packed_size = max_size;
err();
return tomerr(cret);
}
break;
default:
err();
return -EINVAL;
}
*packed_size = max_size;
return 0;
}
int ncr_pk_generate(ncr_algorithm_t algo,
struct ncr_key_generate_params_st * params,
struct key_item_st* private, struct key_item_st* public)
{
int cret, ret;
unsigned long e;
private->algorithm = public->algorithm = algo;
switch(algo) {
case NCR_ALG_RSA:
e = params->params.rsa.e;
if (e == 0)
e = 65537;
cret = rsa_make_key(params->params.rsa.bits, e, &private->key.pk.rsa);
if (cret != CRYPT_OK) {
err();
return tomerr(cret);
}
break;
case NCR_ALG_DSA:
cret = dsa_make_key(params->params.dsa.q_bits, params->params.dsa.p_bits, &private->key.pk.dsa);
if (cret != CRYPT_OK) {
err();
return tomerr(cret);
}
break;
default:
return -EINVAL;
}
ret = ncr_pk_make_public_and_id(private, public);
if (ret < 0) {
err();
return ret;
}
return 0;
}
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