* arch/arm/src/sam34/sam_crypto.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <errno.h>
#include <stdint.h>
#include <crypto/cryptodev.h>
#include <crypto/xform.h>
#include <nuttx/crypto/crypto.h>
* Private Data
****************************************************************************/
static uint32_t g_sam_sesnum;
* Private Functions
****************************************************************************/
* Name: authcompute
*
* Description:
* Calculate the hash.
*
****************************************************************************/
* Name: sam_newsession
*
* Description:
* create new session for crypto.
*
****************************************************************************/
static int sam_newsession(uint32_t *sid, struct cryptoini *cri)
{
if (sid == NULL || cri == NULL)
{
return -EINVAL;
}
switch (cri->cri_alg)
{
case CRYPTO_AES_CBC:
*sid = g_sam_sesnum++;
break;
case CRYPTO_AES_CTR:
if ((cri->cri_klen / 8 - 4) != 16)
{
return -EINVAL;
}
*sid = g_sam_sesnum++;
break;
default :
return -EINVAL;
}
return OK;
}
* Name: sam_freesession
*
* Description:
* free session.
*
****************************************************************************/
static int sam_freesession(uint64_t tid)
{
return 0;
}
* Name: sam_process
*
* Description:
* process session to use hardware algorithm.
*
****************************************************************************/
static int sam_process(struct cryptop *crp)
{
struct cryptodesc *crd;
uint8_t iv[AESCTR_BLOCKSIZE];
for (crd = crp->crp_desc; crd; crd = crd->crd_next)
{
switch (crd->crd_alg)
{
case CRYPTO_AES_CBC:
return aes_cypher(crp->crp_dst, crp->crp_buf, crd->crd_len,
crd->crd_iv, crd->crd_key, 16,
AES_MODE_CBC, crd->crd_flags & CRD_F_ENCRYPT);
case CRYPTO_AES_CTR:
memcpy(iv, crd->crd_key + crd->crd_klen / 8 - AESCTR_NONCESIZE,
AESCTR_NONCESIZE);
memcpy(iv + AESCTR_NONCESIZE, crd->crd_iv, AESCTR_IVSIZE);
memset(iv + AESCTR_NONCESIZE + AESCTR_IVSIZE , 0, 4);
return aes_cypher(crp->crp_dst, crp->crp_buf, crd->crd_len,
iv, crd->crd_key, crd->crd_klen / 8 - 4,
AES_MODE_CTR, crd->crd_flags & CRD_F_ENCRYPT);
default:
return -EINVAL;
}
}
}
* Name: hwcr_init
*
* Description:
* register the hardware crypto driver.
*
****************************************************************************/
void hwcr_init(void)
{
int hwcr_id;
int algs[CRYPTO_ALGORITHM_MAX + 1];
hwcr_id = crypto_get_driverid(0);
DEBUGASSERT(hwcr_id >= 0);
memset(algs, 0, sizeof(algs));
algs[CRYPTO_AES_CBC] = CRYPTO_ALG_FLAG_SUPPORTED;
algs[CRYPTO_AES_CTR] = CRYPTO_ALG_FLAG_SUPPORTED;
crypto_register(hwcr_id, algs, sam_newsession,
sam_freesession, sam_process);
}