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mbed-os/features/storage/kvstore/securestore/SecureStore.cpp

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/*
* Copyright (c) 2018 ARM Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
* Licensed 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.
*/
// ----------------------------------------------------------- Includes -----------------------------------------------------------
#include "SecureStore.h"
#if SECURESTORE_ENABLED
#include "aes.h"
#include "cmac.h"
#include "mbedtls/platform.h"
#include "entropy.h"
#include "DeviceKey.h"
#include "mbed_assert.h"
#include "mbed_wait_api.h"
#include "mbed_error.h"
#include <algorithm>
#include <string.h>
#include <stdio.h>
using namespace mbed;
// --------------------------------------------------------- Definitions ----------------------------------------------------------
static const uint32_t securestore_revision = 1;
static const uint32_t enc_block_size = 16;
static const uint32_t cmac_size = 16;
static const uint32_t iv_size = 8;
static const uint32_t scratch_buf_size = 256;
static const uint32_t derived_key_size = 16;
static const char *const enc_prefix = "ENC";
static const char *const auth_prefix = "AUTH";
static const uint32_t security_flags = KVStore::REQUIRE_CONFIDENTIALITY_FLAG | KVStore::REQUIRE_REPLAY_PROTECTION_FLAG;
namespace {
typedef struct {
uint16_t metadata_size = 0u;
uint16_t revision = 0u;
uint32_t data_size = 0u;
uint32_t create_flags = 0u;
uint8_t iv[iv_size] = { 0u };
} record_metadata_t;
// iterator handle
typedef struct {
KVStore::iterator_t underlying_it;
} key_iterator_handle_t;
}
// incremental set handle
struct SecureStore::inc_set_handle_t {
record_metadata_t metadata;
char *key = nullptr;
uint32_t offset_in_data = 0u;
uint8_t ctr_buf[enc_block_size] = { 0u };
mbedtls_aes_context enc_ctx;
mbedtls_cipher_context_t auth_ctx;
KVStore::set_handle_t underlying_handle;
};
// -------------------------------------------------- Local Functions Declaration ----------------------------------------------------
// -------------------------------------------------- Functions Implementation ----------------------------------------------------
int encrypt_decrypt_start(mbedtls_aes_context &enc_aes_ctx, uint8_t *iv, const char *key,
uint8_t *ctr_buf, uint8_t *salt_buf, int salt_buf_size)
{
DeviceKey &devkey = DeviceKey::get_instance();
char *salt = reinterpret_cast<char *>(salt_buf);
uint8_t encrypt_key[derived_key_size];
strcpy(salt, enc_prefix);
int pos = strlen(enc_prefix);
strncpy(salt + pos, key, salt_buf_size - pos - 1);
salt_buf[salt_buf_size - 1] = 0;
int os_ret = devkey.generate_derived_key(salt_buf, strlen(salt), encrypt_key, DEVICE_KEY_16BYTE);
if (os_ret) {
return os_ret;
}
mbedtls_aes_init(&enc_aes_ctx);
mbedtls_aes_setkey_enc(&enc_aes_ctx, encrypt_key, enc_block_size * 8);
memcpy(ctr_buf, iv, iv_size);
memset(ctr_buf + iv_size, 0, iv_size);
return 0;
}
int encrypt_decrypt_data(mbedtls_aes_context &enc_aes_ctx, const uint8_t *in_buf,
uint8_t *out_buf, uint32_t chunk_size, uint8_t *ctr_buf, size_t &aes_offs)
{
uint8_t stream_block[enc_block_size] = { 0 };
return mbedtls_aes_crypt_ctr(&enc_aes_ctx, chunk_size, &aes_offs, ctr_buf,
stream_block, in_buf, out_buf);
}
int cmac_calc_start(mbedtls_cipher_context_t &auth_ctx, const char *key, uint8_t *salt_buf, int salt_buf_size)
{
DeviceKey &devkey = DeviceKey::get_instance();
char *salt = reinterpret_cast<char *>(salt_buf);
uint8_t auth_key[derived_key_size];
strcpy(salt, auth_prefix);
int pos = strlen(auth_prefix);
strncpy(salt + pos, key, salt_buf_size - pos - 1);
salt_buf[salt_buf_size - 1] = 0;
int os_ret = devkey.generate_derived_key(salt_buf, strlen(salt), auth_key, DEVICE_KEY_16BYTE);
if (os_ret) {
return os_ret;
}
const mbedtls_cipher_info_t *cipher_info = mbedtls_cipher_info_from_type(MBEDTLS_CIPHER_AES_128_ECB);
mbedtls_cipher_init(&auth_ctx);
if ((os_ret = mbedtls_cipher_setup(&auth_ctx, cipher_info)) != 0) {
return os_ret;
}
os_ret = mbedtls_cipher_cmac_starts(&auth_ctx, auth_key, cmac_size * 8);
if (os_ret != 0) {
return os_ret;
}
return 0;
}
int cmac_calc_data(mbedtls_cipher_context_t &auth_ctx, const void *input, size_t ilen)
{
int os_ret;
os_ret = mbedtls_cipher_cmac_update(&auth_ctx, static_cast<const uint8_t *>(input), ilen);
return os_ret;
}
int cmac_calc_finish(mbedtls_cipher_context_t &auth_ctx, uint8_t *output)
{
int os_ret;
os_ret = mbedtls_cipher_cmac_finish(&auth_ctx, output);
return os_ret;
}
// Class member functions
SecureStore::SecureStore(KVStore *underlying_kv, KVStore *rbp_kv) :
_is_initialized(false), _underlying_kv(underlying_kv), _rbp_kv(rbp_kv), _entropy(0),
_ih(0), _scratch_buf(0)
{
}
SecureStore::~SecureStore()
{
deinit();
}
int SecureStore::set_start(set_handle_t *handle, const char *key, size_t final_data_size,
uint32_t create_flags)
{
int ret, os_ret;
info_t info;
bool enc_started = false, auth_started = false;
if (!_is_initialized) {
return MBED_ERROR_NOT_READY;
}
if (!is_valid_key(key)) {
return MBED_ERROR_INVALID_ARGUMENT;
}
_mutex.lock();
*handle = reinterpret_cast<set_handle_t>(_ih);
// Validate internal RBP data
if (_rbp_kv) {
ret = _rbp_kv->get_info(key, &info);
if (ret == MBED_SUCCESS) {
if (info.flags & WRITE_ONCE_FLAG) {
// Trying to re-write a key that is write protected
ret = MBED_ERROR_WRITE_PROTECTED;
goto fail;
}
if (!(create_flags & REQUIRE_REPLAY_PROTECTION_FLAG)) {
// Trying to re-write a key that that has REPLAY_PROTECTION
// with a new key that has this flag not set.
ret = MBED_ERROR_INVALID_ARGUMENT;
goto fail;
}
} else if (ret != MBED_ERROR_ITEM_NOT_FOUND) {
ret = MBED_ERROR_READ_FAILED;
goto fail;
}
} else {
// Only trust external flags, if internal RBP is not in use
ret = _underlying_kv->get(key, &_ih->metadata, sizeof(record_metadata_t));
if (ret == MBED_SUCCESS) {
// Must not remove RP flag, even though internal RBP KV is not in use.
if (!(create_flags & REQUIRE_REPLAY_PROTECTION_FLAG) && (_ih->metadata.create_flags & REQUIRE_REPLAY_PROTECTION_FLAG)) {
ret = MBED_ERROR_INVALID_ARGUMENT;
goto fail;
}
// Existing key is write protected
if (_ih->metadata.create_flags & WRITE_ONCE_FLAG) {
ret = MBED_ERROR_WRITE_PROTECTED;
goto fail;
}
}
}
// Fill metadata
_ih->metadata.create_flags = create_flags;
_ih->metadata.data_size = final_data_size;
_ih->metadata.metadata_size = sizeof(record_metadata_t);
_ih->metadata.revision = securestore_revision;
if (create_flags & REQUIRE_CONFIDENTIALITY_FLAG) {
// generate a new random iv
os_ret = mbedtls_entropy_func(_entropy, _ih->metadata.iv, iv_size);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto fail;
}
os_ret = encrypt_decrypt_start(_ih->enc_ctx, _ih->metadata.iv, key, _ih->ctr_buf, _scratch_buf,
scratch_buf_size);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto fail;
}
enc_started = true;
} else {
memset(_ih->metadata.iv, 0, iv_size);
}
os_ret = cmac_calc_start(_ih->auth_ctx, key, _scratch_buf, scratch_buf_size);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto fail;
}
auth_started = true;
// Although name is not part of the data, we calculate CMAC on it as well
os_ret = cmac_calc_data(_ih->auth_ctx, key, strlen(key));
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto fail;
}
os_ret = cmac_calc_data(_ih->auth_ctx, &_ih->metadata, sizeof(record_metadata_t));
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto fail;
}
_ih->offset_in_data = 0;
_ih->key = 0;
// Should strip security flags from underlying storage
ret = _underlying_kv->set_start(&_ih->underlying_handle, key,
sizeof(record_metadata_t) + final_data_size + cmac_size,
create_flags & ~security_flags);
if (ret) {
goto fail;
}
ret = _underlying_kv->set_add_data(_ih->underlying_handle, &_ih->metadata,
sizeof(record_metadata_t));
if (ret) {
goto fail;
}
if (create_flags & (REQUIRE_REPLAY_PROTECTION_FLAG | WRITE_ONCE_FLAG)) {
_ih->key = new char[strlen(key) + 1];
strcpy(_ih->key, key);
}
goto end;
fail:
if (enc_started) {
mbedtls_aes_free(&_ih->enc_ctx);
}
if (auth_started) {
mbedtls_cipher_free(&_ih->auth_ctx);
}
// mark handle as invalid by clearing metadata size field in header
_ih->metadata.metadata_size = 0;
_mutex.unlock();
end:
return ret;
}
int SecureStore::set_add_data(set_handle_t handle, const void *value_data, size_t data_size)
{
size_t aes_offs = 0;
int os_ret, ret = MBED_SUCCESS;
const uint8_t *src_ptr;
if (reinterpret_cast<inc_set_handle_t *>(handle) != _ih) {
return MBED_ERROR_INVALID_ARGUMENT;
}
if (!value_data && data_size) {
return MBED_ERROR_INVALID_ARGUMENT;
}
if (!_ih->metadata.metadata_size) {
return MBED_ERROR_INVALID_ARGUMENT;
}
if (_ih->offset_in_data + data_size > _ih->metadata.data_size) {
ret = MBED_ERROR_INVALID_SIZE;
goto end;
}
src_ptr = static_cast<const uint8_t *>(value_data);
while (data_size) {
uint32_t chunk_size;
const uint8_t *dst_ptr;
if (_ih->metadata.create_flags & REQUIRE_CONFIDENTIALITY_FLAG) {
// In encrypt mode we don't want to allocate a buffer in the size given by the user -
// Encrypt the data chunk by chunk
chunk_size = std::min((uint32_t) data_size, scratch_buf_size);
dst_ptr = _scratch_buf;
os_ret = encrypt_decrypt_data(_ih->enc_ctx, src_ptr, _scratch_buf,
chunk_size, _ih->ctr_buf, aes_offs);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto fail;
}
} else {
chunk_size = data_size;
dst_ptr = static_cast <const uint8_t *>(value_data);
}
os_ret = cmac_calc_data(_ih->auth_ctx, dst_ptr, chunk_size);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto fail;
}
ret = _underlying_kv->set_add_data(_ih->underlying_handle, dst_ptr, chunk_size);
if (ret) {
goto fail;
}
data_size -= chunk_size;
src_ptr += chunk_size;
_ih->offset_in_data += chunk_size;
}
goto end;
fail:
if (_ih->key) {
delete[] _ih->key;
}
if (_ih->metadata.create_flags & REQUIRE_CONFIDENTIALITY_FLAG) {
mbedtls_aes_free(&_ih->enc_ctx);
}
mbedtls_cipher_free(&_ih->auth_ctx);
// mark handle as invalid by clearing metadata size field in header
_ih->metadata.metadata_size = 0;
_mutex.unlock();
end:
return ret;
}
int SecureStore::set_finalize(set_handle_t handle)
{
int os_ret, ret = MBED_SUCCESS;
uint8_t cmac[cmac_size] = {0};
if (reinterpret_cast<inc_set_handle_t *>(handle) != _ih) {
return MBED_ERROR_INVALID_ARGUMENT;
}
if (!_ih->metadata.metadata_size) {
return MBED_ERROR_INVALID_ARGUMENT;
}
if (_ih->offset_in_data != _ih->metadata.data_size) {
ret = MBED_ERROR_INVALID_SIZE;
goto end;
}
os_ret = cmac_calc_finish(_ih->auth_ctx, cmac);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto end;
}
ret = _underlying_kv->set_add_data(_ih->underlying_handle, cmac, cmac_size);
if (ret) {
goto end;
}
ret = _underlying_kv->set_finalize(_ih->underlying_handle);
if (ret) {
goto end;
}
if (_rbp_kv && (_ih->metadata.create_flags & (REQUIRE_REPLAY_PROTECTION_FLAG | WRITE_ONCE_FLAG))) {
// In rollback protect case, we need to store CMAC in RBP store.
// If it's also write once case, set write once flag in the RBP key as well.
// Use RBP storage also in write once case only - in order to prevent attacks removing
// a written once value from underlying KV.
ret = _rbp_kv->set(_ih->key, cmac, cmac_size, _ih->metadata.create_flags & WRITE_ONCE_FLAG);
delete[] _ih->key;
if (ret) {
goto end;
}
}
end:
// mark handle as invalid by clearing metadata size field in header
_ih->metadata.metadata_size = 0;
if (_ih->metadata.create_flags & REQUIRE_CONFIDENTIALITY_FLAG) {
mbedtls_aes_free(&_ih->enc_ctx);
}
mbedtls_cipher_free(&_ih->auth_ctx);
_mutex.unlock();
return ret;
}
int SecureStore::set(const char *key, const void *buffer, size_t size, uint32_t create_flags)
{
int ret;
set_handle_t handle;
// Don't wait till we get to set_add_data to catch this
if (!buffer && size) {
return MBED_ERROR_INVALID_ARGUMENT;
}
ret = set_start(&handle, key, size, create_flags);
if (ret) {
return ret;
}
ret = set_add_data(handle, buffer, size);
if (ret) {
return ret;
}
ret = set_finalize(handle);
return ret;
}
int SecureStore::remove(const char *key)
{
info_t info;
_mutex.lock();
int ret = do_get(key, 0, 0, 0, 0, &info);
// Allow deleting key if read error is of our own errors
if ((ret != MBED_SUCCESS) && (ret != MBED_ERROR_AUTHENTICATION_FAILED) &&
(ret != MBED_ERROR_RBP_AUTHENTICATION_FAILED)) {
goto end;
}
if (ret == 0 && info.flags & WRITE_ONCE_FLAG) {
ret = MBED_ERROR_WRITE_PROTECTED;
goto end;
}
ret = _underlying_kv->remove(key);
if (ret) {
goto end;
}
if (_rbp_kv && (info.flags & REQUIRE_REPLAY_PROTECTION_FLAG)) {
ret = _rbp_kv->remove(key);
if ((ret != MBED_SUCCESS) && (ret != MBED_ERROR_ITEM_NOT_FOUND)) {
goto end;
}
}
ret = MBED_SUCCESS;
end:
_mutex.unlock();
return ret;
}
int SecureStore::do_get(const char *key, void *buffer, size_t buffer_size, size_t *actual_size,
size_t offset, info_t *info)
{
int os_ret, ret;
bool rbp_key_exists = false;
uint8_t rbp_cmac[cmac_size];
size_t aes_offs = 0;
uint32_t data_size;
uint32_t actual_data_size;
uint32_t current_offset;
uint32_t chunk_size;
uint32_t enc_lead_size;
uint8_t *dest_buf;
bool enc_started = false, auth_started = false;
uint32_t create_flags;
size_t read_len;
info_t rbp_info;
if (!is_valid_key(key)) {
return MBED_ERROR_INVALID_ARGUMENT;
}
if (_rbp_kv) {
ret = _rbp_kv->get_info(key, &rbp_info);
if (ret == MBED_SUCCESS) {
rbp_key_exists = true;
ret = _rbp_kv->get(key, rbp_cmac, cmac_size, &read_len);
if (ret) {
goto end;
}
if ((read_len != cmac_size) || (rbp_info.size != cmac_size)) {
ret = MBED_ERROR_RBP_AUTHENTICATION_FAILED;
}
} else if (ret != MBED_ERROR_ITEM_NOT_FOUND) {
goto end;
}
}
ret = _underlying_kv->get(key, &_ih->metadata, sizeof(record_metadata_t), &read_len);
if (ret) {
// In case we have the key in the RBP KV, then even if the key wasn't found in
// the underlying KV, we may have been exposed to an attack. Return an RBP authentication error.
if (rbp_key_exists) {
ret = MBED_ERROR_RBP_AUTHENTICATION_FAILED;
}
goto end;
}
// Validate header size
if ((read_len != sizeof(record_metadata_t)) || (_ih->metadata.metadata_size != sizeof(record_metadata_t))) {
ret = MBED_ERROR_RBP_AUTHENTICATION_FAILED;
goto end;
}
create_flags = _ih->metadata.create_flags;
if (!_rbp_kv) {
create_flags &= ~REQUIRE_REPLAY_PROTECTION_FLAG;
}
// Another potential attack case - key hasn't got the RP flag set, but exists in the RBP KV
if (rbp_key_exists && !(create_flags & (REQUIRE_REPLAY_PROTECTION_FLAG | WRITE_ONCE_FLAG))) {
ret = MBED_ERROR_RBP_AUTHENTICATION_FAILED;
goto end;
}
os_ret = cmac_calc_start(_ih->auth_ctx, key, _scratch_buf, scratch_buf_size);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto end;
}
auth_started = true;
// Although name is not part of the data, we calculate CMAC on it as well
os_ret = cmac_calc_data(_ih->auth_ctx, key, strlen(key));
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto end;
}
os_ret = cmac_calc_data(_ih->auth_ctx, &_ih->metadata, sizeof(record_metadata_t));
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto end;
}
if (create_flags & REQUIRE_CONFIDENTIALITY_FLAG) {
os_ret = encrypt_decrypt_start(_ih->enc_ctx, _ih->metadata.iv, key, _ih->ctr_buf, _scratch_buf,
scratch_buf_size);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto end;
}
enc_started = true;
}
data_size = _ih->metadata.data_size;
actual_data_size = std::min((uint32_t) buffer_size, data_size - offset);
current_offset = 0;
enc_lead_size = 0;
while (data_size) {
// Make sure we read to the user buffer only between offset and offset + actual_data_size
if ((current_offset >= offset) && (current_offset < offset + actual_data_size)) {
dest_buf = (static_cast <uint8_t *>(buffer)) + enc_lead_size;
chunk_size = actual_data_size - enc_lead_size;
enc_lead_size = 0;
} else {
dest_buf = _scratch_buf;
if (current_offset < offset) {
chunk_size = std::min(scratch_buf_size, offset - current_offset);
// A special case: encrypted user data starts at a middle of an encryption block.
// In this case, we need to read entire block into our scratch buffer, and copy
// the encrypted lead size to the user buffer start
if ((create_flags & REQUIRE_CONFIDENTIALITY_FLAG) &&
(chunk_size % enc_block_size)) {
enc_lead_size = std::min(enc_block_size - chunk_size % enc_block_size, actual_data_size);
chunk_size += enc_lead_size;
}
} else {
chunk_size = std::min(scratch_buf_size, data_size);
enc_lead_size = 0;
}
}
ret = _underlying_kv->get(key, dest_buf, chunk_size, 0,
_ih->metadata.metadata_size + current_offset);
if (ret != MBED_SUCCESS) {
goto end;
}
os_ret = cmac_calc_data(_ih->auth_ctx, dest_buf, chunk_size);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto end;
}
if (create_flags & REQUIRE_CONFIDENTIALITY_FLAG) {
// Decrypt data in place
os_ret = encrypt_decrypt_data(_ih->enc_ctx, dest_buf, dest_buf, chunk_size, _ih->ctr_buf,
aes_offs);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto end;
}
if (enc_lead_size) {
// Now copy decrypted lead size to user buffer start
memcpy(buffer, dest_buf + chunk_size - enc_lead_size, enc_lead_size);
}
}
current_offset += chunk_size;
data_size -= chunk_size;
}
if (actual_size) {
*actual_size = actual_data_size;
}
uint8_t calc_cmac[cmac_size], read_cmac[cmac_size];
os_ret = cmac_calc_finish(_ih->auth_ctx, calc_cmac);
if (os_ret) {
ret = MBED_ERROR_FAILED_OPERATION;
goto end;
}
// Check with record CMAC
ret = _underlying_kv->get(key, read_cmac, cmac_size, 0,
_ih->metadata.metadata_size + _ih->metadata.data_size);
if (ret) {
goto end;
}
if (memcmp(calc_cmac, read_cmac, cmac_size) != 0) {
ret = MBED_ERROR_AUTHENTICATION_FAILED;
goto end;
}
// If rollback protect, check also CMAC stored in RBP store
if (_rbp_kv && (create_flags & (REQUIRE_REPLAY_PROTECTION_FLAG | WRITE_ONCE_FLAG))) {
if (!rbp_key_exists) {
ret = MBED_ERROR_RBP_AUTHENTICATION_FAILED;
goto end;
}
if (memcmp(calc_cmac, rbp_cmac, cmac_size) != 0) {
ret = MBED_ERROR_RBP_AUTHENTICATION_FAILED;
goto end;
}
}
if (info) {
info->flags = _ih->metadata.create_flags;
info->size = _ih->metadata.data_size;
}
end:
_ih->metadata.metadata_size = 0;
if (enc_started) {
mbedtls_aes_free(&_ih->enc_ctx);
}
if (auth_started) {
mbedtls_cipher_free(&_ih->auth_ctx);
}
return ret;
}
int SecureStore::get(const char *key, void *buffer, size_t buffer_size, size_t *actual_size,
size_t offset)
{
_mutex.lock();
int ret = do_get(key, buffer, buffer_size, actual_size, offset);
_mutex.unlock();
return ret;
}
int SecureStore::get_info(const char *key, info_t *info)
{
_mutex.lock();
int ret = do_get(key, 0, 0, 0, 0, info);
_mutex.unlock();
return ret;
}
int SecureStore::init()
{
int ret = MBED_SUCCESS;
MBED_ASSERT(!(scratch_buf_size % enc_block_size));
if (scratch_buf_size % enc_block_size) {
return MBED_SYSTEM_ERROR_BASE;
}
_mutex.lock();
#if defined(MBEDTLS_PLATFORM_C)
ret = mbedtls_platform_setup(NULL);
if (ret) {
goto fail;
}
#endif /* MBEDTLS_PLATFORM_C */
_entropy = new mbedtls_entropy_context;
mbedtls_entropy_init(_entropy);
_scratch_buf = new uint8_t[scratch_buf_size];
_ih = new inc_set_handle_t;
ret = _underlying_kv->init();
if (ret) {
goto fail;
}
if (_rbp_kv) {
ret = _rbp_kv->init();
if (ret) {
goto fail;
}
}
_is_initialized = true;
fail:
_mutex.unlock();
return ret;
}
int SecureStore::deinit()
{
_mutex.lock();
int ret;
if (_is_initialized) {
if (_entropy) {
mbedtls_entropy_free(_entropy);
delete _entropy;
delete _ih;
delete _scratch_buf;
_entropy = nullptr;
}
ret = _underlying_kv->deinit();
if (ret) {
goto END;
}
if (_rbp_kv) {
ret = _rbp_kv->deinit();
if (ret) {
goto END;
}
}
}
_is_initialized = false;
#if defined(MBEDTLS_PLATFORM_C)
mbedtls_platform_teardown(NULL);
#endif /* MBEDTLS_PLATFORM_C */
ret = MBED_SUCCESS;
END:
_mutex.unlock();
return ret;
}
int SecureStore::reset()
{
int ret;
if (!_is_initialized) {
return MBED_ERROR_NOT_READY;
}
_mutex.lock();
ret = _underlying_kv->reset();
if (ret) {
goto end;
}
if (_rbp_kv) {
ret = _rbp_kv->reset();
if (ret) {
goto end;
}
}
end:
_mutex.unlock();
return ret;
}
int SecureStore::iterator_open(iterator_t *it, const char *prefix)
{
key_iterator_handle_t *handle;
if (!_is_initialized) {
return MBED_ERROR_NOT_READY;
}
if (!it) {
return MBED_ERROR_INVALID_ARGUMENT;
}
handle = new key_iterator_handle_t;
*it = reinterpret_cast<iterator_t>(handle);
return _underlying_kv->iterator_open(&handle->underlying_it, prefix);
}
int SecureStore::iterator_next(iterator_t it, char *key, size_t key_size)
{
key_iterator_handle_t *handle;
if (!_is_initialized) {
return MBED_ERROR_NOT_READY;
}
handle = reinterpret_cast<key_iterator_handle_t *>(it);
return _underlying_kv->iterator_next(handle->underlying_it, key, key_size);
}
int SecureStore::iterator_close(iterator_t it)
{
key_iterator_handle_t *handle;
int ret;
if (!_is_initialized) {
return MBED_ERROR_NOT_READY;
}
handle = reinterpret_cast<key_iterator_handle_t *>(it);
ret = _underlying_kv->iterator_close(handle->underlying_it);
delete handle;
return ret;
}
#endif
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