Mouse code for the MacroRat
mbed-dev/targets/TARGET_NUVOTON/TARGET_NUC472/crypto/crypto-misc.c
- Committer:
- sahilmgandhi
- Date:
- 2017-05-14
- Revision:
- 18:6a4db94011d3
File content as of revision 18:6a4db94011d3:
/* mbed Microcontroller Library * Copyright (c) 2015-2016 Nuvoton * * 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. */ #include "cmsis.h" #include "mbed_assert.h" #include "nu_modutil.h" #include "nu_bitutil.h" #include "crypto-misc.h" static int crypto_inited = 0; static int crypto_sha_avail = 1; void crypto_init(void) { if (crypto_inited) { return; } crypto_inited = 1; CLK_EnableModuleClock(CRPT_MODULE); } /* Implementation that should never be optimized out by the compiler */ void crypto_zeroize(void *v, size_t n) { volatile unsigned char *p = (unsigned char*) v; while (n--) { *p++ = 0; } } int crypto_sha_acquire(void) { if (crypto_sha_avail) { crypto_sha_avail = 0; return 1; } else { return 0; } } void crypto_sha_release(void) { if (! crypto_sha_avail) { crypto_sha_avail = 1; } }