Xuyi Wang / wolfssh

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src/misc.c@0:c4152c628df5, 2019-11-25 (annotated)

Committer:
sPymbed
Date:
Mon Nov 25 14:24:05 2019 +0000
Revision:
0:c4152c628df5
first commit

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sPymbed 0:c4152c628df5 1 /* misc.c
sPymbed 0:c4152c628df5 2 *
sPymbed 0:c4152c628df5 3 * Copyright (C) 2014-2016 wolfSSL Inc.
sPymbed 0:c4152c628df5 4 *
sPymbed 0:c4152c628df5 5 * This file is part of wolfSSH.
sPymbed 0:c4152c628df5 6 *
sPymbed 0:c4152c628df5 7 * wolfSSH is free software; you can redistribute it and/or modify
sPymbed 0:c4152c628df5 8 * it under the terms of the GNU General Public License as published by
sPymbed 0:c4152c628df5 9 * the Free Software Foundation; either version 3 of the License, or
sPymbed 0:c4152c628df5 10 * (at your option) any later version.
sPymbed 0:c4152c628df5 11 *
sPymbed 0:c4152c628df5 12 * wolfSSH is distributed in the hope that it will be useful,
sPymbed 0:c4152c628df5 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
sPymbed 0:c4152c628df5 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
sPymbed 0:c4152c628df5 15 * GNU General Public License for more details.
sPymbed 0:c4152c628df5 16 *
sPymbed 0:c4152c628df5 17 * You should have received a copy of the GNU General Public License
sPymbed 0:c4152c628df5 18 * along with wolfSSH. If not, see <http://www.gnu.org/licenses/>.
sPymbed 0:c4152c628df5 19 */
sPymbed 0:c4152c628df5 20
sPymbed 0:c4152c628df5 21 /*
sPymbed 0:c4152c628df5 22 * The misc module contains inline functions. This file is either included
sPymbed 0:c4152c628df5 23 * into source files or built separately depending on the inline configure
sPymbed 0:c4152c628df5 24 * option.
sPymbed 0:c4152c628df5 25 */
sPymbed 0:c4152c628df5 26
sPymbed 0:c4152c628df5 27
sPymbed 0:c4152c628df5 28 #ifdef HAVE_CONFIG_H
sPymbed 0:c4152c628df5 29 #include <config.h>
sPymbed 0:c4152c628df5 30 #endif
sPymbed 0:c4152c628df5 31
sPymbed 0:c4152c628df5 32
sPymbed 0:c4152c628df5 33 #include <wolfssh/settings.h>
sPymbed 0:c4152c628df5 34
sPymbed 0:c4152c628df5 35
sPymbed 0:c4152c628df5 36 #ifndef WOLFSSH_MISC_C
sPymbed 0:c4152c628df5 37 #define WOLFSSH_MISC_C
sPymbed 0:c4152c628df5 38
sPymbed 0:c4152c628df5 39
sPymbed 0:c4152c628df5 40 #include <wolfssh/misc.h>
sPymbed 0:c4152c628df5 41
sPymbed 0:c4152c628df5 42
sPymbed 0:c4152c628df5 43 #ifdef NO_INLINE
sPymbed 0:c4152c628df5 44 #define STATIC
sPymbed 0:c4152c628df5 45 #else
sPymbed 0:c4152c628df5 46 #define STATIC static
sPymbed 0:c4152c628df5 47 #endif
sPymbed 0:c4152c628df5 48
sPymbed 0:c4152c628df5 49
sPymbed 0:c4152c628df5 50 /* Check for if compiling misc.c when not needed. */
sPymbed 0:c4152c628df5 51 #if !defined(WOLFSSH_MISC_INCLUDED) && !defined(NO_INLINE)
sPymbed 0:c4152c628df5 52 #define MISC_WARNING "misc.c does not need to be compiled when using inline (NO_INLINE not defined))"
sPymbed 0:c4152c628df5 53
sPymbed 0:c4152c628df5 54 #ifndef _MSC_VER
sPymbed 0:c4152c628df5 55 #warning MISC_WARNING
sPymbed 0:c4152c628df5 56 #else
sPymbed 0:c4152c628df5 57 #pragma message("warning: " MISC_WARNING)
sPymbed 0:c4152c628df5 58 #endif
sPymbed 0:c4152c628df5 59
sPymbed 0:c4152c628df5 60 #else /* !WOLFSSL_MISC_INCLUDED && !NO_INLINE */
sPymbed 0:c4152c628df5 61
sPymbed 0:c4152c628df5 62
sPymbed 0:c4152c628df5 63 #ifndef min
sPymbed 0:c4152c628df5 64 STATIC INLINE word32 min(word32 a, word32 b)
sPymbed 0:c4152c628df5 65 {
sPymbed 0:c4152c628df5 66 return a > b ? b : a;
sPymbed 0:c4152c628df5 67 }
sPymbed 0:c4152c628df5 68 #endif /* min */
sPymbed 0:c4152c628df5 69
sPymbed 0:c4152c628df5 70
sPymbed 0:c4152c628df5 71 /* convert opaque to 32 bit integer */
sPymbed 0:c4152c628df5 72 STATIC INLINE void ato32(const byte* c, word32* u32)
sPymbed 0:c4152c628df5 73 {
sPymbed 0:c4152c628df5 74 *u32 = (c[0] << 24) | (c[1] << 16) | (c[2] << 8) | c[3];
sPymbed 0:c4152c628df5 75 }
sPymbed 0:c4152c628df5 76
sPymbed 0:c4152c628df5 77
sPymbed 0:c4152c628df5 78 /* convert 32 bit integer to opaque */
sPymbed 0:c4152c628df5 79 STATIC INLINE void c32toa(word32 u32, byte* c)
sPymbed 0:c4152c628df5 80 {
sPymbed 0:c4152c628df5 81 c[0] = (u32 >> 24) & 0xff;
sPymbed 0:c4152c628df5 82 c[1] = (u32 >> 16) & 0xff;
sPymbed 0:c4152c628df5 83 c[2] = (u32 >> 8) & 0xff;
sPymbed 0:c4152c628df5 84 c[3] = u32 & 0xff;
sPymbed 0:c4152c628df5 85 }
sPymbed 0:c4152c628df5 86
sPymbed 0:c4152c628df5 87
sPymbed 0:c4152c628df5 88 /* Make sure compiler doesn't skip */
sPymbed 0:c4152c628df5 89 STATIC INLINE void ForceZero(const void* mem, word32 length)
sPymbed 0:c4152c628df5 90 {
sPymbed 0:c4152c628df5 91 volatile byte* z = (volatile byte*)mem;
sPymbed 0:c4152c628df5 92
sPymbed 0:c4152c628df5 93 while (length--) *z++ = 0;
sPymbed 0:c4152c628df5 94 }
sPymbed 0:c4152c628df5 95
sPymbed 0:c4152c628df5 96
sPymbed 0:c4152c628df5 97 /* check all length bytes for equality, return 0 on success */
sPymbed 0:c4152c628df5 98 STATIC INLINE int ConstantCompare(const byte* a, const byte* b,
sPymbed 0:c4152c628df5 99 word32 length)
sPymbed 0:c4152c628df5 100 {
sPymbed 0:c4152c628df5 101 word32 i;
sPymbed 0:c4152c628df5 102 word32 compareSum = 0;
sPymbed 0:c4152c628df5 103
sPymbed 0:c4152c628df5 104 for (i = 0; i < length; i++) {
sPymbed 0:c4152c628df5 105 compareSum |= a[i] ^ b[i];
sPymbed 0:c4152c628df5 106 }
sPymbed 0:c4152c628df5 107
sPymbed 0:c4152c628df5 108 return compareSum;
sPymbed 0:c4152c628df5 109 }
sPymbed 0:c4152c628df5 110
sPymbed 0:c4152c628df5 111
sPymbed 0:c4152c628df5 112 #undef STATIC
sPymbed 0:c4152c628df5 113
sPymbed 0:c4152c628df5 114
sPymbed 0:c4152c628df5 115 #endif /* !WOLFSSL_MISC_INCLUDED && !NO_INLINE */
sPymbed 0:c4152c628df5 116
sPymbed 0:c4152c628df5 117
sPymbed 0:c4152c628df5 118 #endif /* WOLFSSH_MISC_C */