Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_NUVOTON/TARGET_NUC472/crypto/crypto-misc.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_NUVOTON/TARGET_NUC472/crypto/crypto-misc.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,63 @@ +/* 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; + } +}