mirror of https://github.com/ARMmbed/mbed-os.git
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015-2016 Nuvoton
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "cmsis.h"
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#include "mbed_assert.h"
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#include "nu_modutil.h"
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#include "nu_bitutil.h"
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#include "crypto-misc.h"
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static int crypto_inited = 0;
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static int crypto_sha_avail = 1;
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void crypto_init(void)
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{
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if (crypto_inited) {
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return;
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}
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crypto_inited = 1;
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CLK_EnableModuleClock(CRPT_MODULE);
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}
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/* Implementation that should never be optimized out by the compiler */
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void crypto_zeroize(void *v, size_t n)
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{
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volatile unsigned char *p = (unsigned char*) v;
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while (n--) {
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*p++ = 0;
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}
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}
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int crypto_sha_acquire(void)
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{
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if (crypto_sha_avail) {
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crypto_sha_avail = 0;
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return 1;
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}
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else {
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return 0;
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}
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}
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void crypto_sha_release(void)
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{
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if (! crypto_sha_avail) {
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crypto_sha_avail = 1;
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}
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}
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