Marek Trojan / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_NUVOTON/TARGET_NUC472/crypto/crypto-misc.c@151:02e0a0aed4ec, 2016-11-08 (annotated)

Committer:
<>
Date:
Tue Nov 08 17:45:16 2016 +0000
Revision:
151:02e0a0aed4ec
Parent:
149:156823d33999 
This updates the lib to the mbed lib v129

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2015-2016 Nuvoton
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16
<> 149:156823d33999 17
<> 149:156823d33999 18 #include "cmsis.h"
<> 149:156823d33999 19 #include "mbed_assert.h"
<> 149:156823d33999 20 #include "nu_modutil.h"
<> 149:156823d33999 21 #include "nu_bitutil.h"
<> 149:156823d33999 22 #include "crypto-misc.h"
<> 149:156823d33999 23
<> 149:156823d33999 24 static int crypto_inited = 0;
<> 149:156823d33999 25 static int crypto_sha_avail = 1;
<> 149:156823d33999 26
<> 149:156823d33999 27 void crypto_init(void)
<> 149:156823d33999 28 {
<> 149:156823d33999 29 if (crypto_inited) {
<> 149:156823d33999 30 return;
<> 149:156823d33999 31 }
<> 149:156823d33999 32 crypto_inited = 1;
<> 149:156823d33999 33
<> 149:156823d33999 34 CLK_EnableModuleClock(CRPT_MODULE);
<> 149:156823d33999 35 }
<> 149:156823d33999 36
<> 149:156823d33999 37 /* Implementation that should never be optimized out by the compiler */
<> 149:156823d33999 38 void crypto_zeroize(void *v, size_t n)
<> 149:156823d33999 39 {
<> 149:156823d33999 40 volatile unsigned char *p = (unsigned char*) v;
<> 149:156823d33999 41 while (n--) {
<> 149:156823d33999 42 *p++ = 0;
<> 149:156823d33999 43 }
<> 149:156823d33999 44 }
<> 149:156823d33999 45
<> 149:156823d33999 46 int crypto_sha_acquire(void)
<> 149:156823d33999 47 {
<> 149:156823d33999 48 if (crypto_sha_avail) {
<> 149:156823d33999 49 crypto_sha_avail = 0;
<> 149:156823d33999 50 return 1;
<> 149:156823d33999 51 }
<> 149:156823d33999 52 else {
<> 149:156823d33999 53 return 0;
<> 149:156823d33999 54 }
<> 149:156823d33999 55
<> 149:156823d33999 56 }
<> 149:156823d33999 57
<> 149:156823d33999 58 void crypto_sha_release(void)
<> 149:156823d33999 59 {
<> 149:156823d33999 60 if (! crypto_sha_avail) {
<> 149:156823d33999 61 crypto_sha_avail = 1;
<> 149:156823d33999 62 }
<> 149:156823d33999 63 }