139 lines
4.8 KiB
C
139 lines
4.8 KiB
C
//==============================================================================
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// This file is part of Master Password.
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// Copyright (c) 2011-2017, Maarten Billemont.
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//
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// Master Password is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Master Password is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You can find a copy of the GNU General Public License in the
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// LICENSE file. Alternatively, see <http://www.gnu.org/licenses/>.
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//==============================================================================
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#ifndef _MPW_UTIL_H
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#define _MPW_UTIL_H
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#include <stdio.h>
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#include "mpw-types.h"
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//// Logging.
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#ifndef trc
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extern int mpw_verbosity;
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#define trc_level 3
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#define trc(...) ({ \
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if (mpw_verbosity >= 3) \
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fprintf( stderr, __VA_ARGS__ ); })
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#endif
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#ifndef dbg
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#define dbg_level 2
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#define dbg(...) ({ \
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if (mpw_verbosity >= 2) \
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fprintf( stderr, __VA_ARGS__ ); })
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#endif
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#ifndef inf
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#define inf_level 1
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#define inf(...) ({ \
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if (mpw_verbosity >= 1) \
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fprintf( stderr, __VA_ARGS__ ); })
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#endif
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#ifndef wrn
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#define wrn_level 0
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#define wrn(...) ({ \
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if (mpw_verbosity >= 0) \
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fprintf( stderr, __VA_ARGS__ ); })
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#endif
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#ifndef err
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#define err_level -1
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#define err(...) ({ \
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if (mpw_verbosity >= -1) \
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fprintf( stderr, __VA_ARGS__ ); })
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#endif
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#ifndef ftl
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#define ftl_level -2
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#define ftl(...) ({ \
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if (mpw_verbosity >= -2) \
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fprintf( stderr, __VA_ARGS__ ); \
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exit( 2 ); })
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#endif
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#ifndef min
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#define min(a, b) ({ \
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__typeof__ (a) _a = (a); \
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__typeof__ (b) _b = (b); \
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_a < _b ? _a : _b; })
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#endif
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#ifndef max
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#define max(a, b) ({ \
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__typeof__ (a) _a = (a); \
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__typeof__ (b) _b = (b); \
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_a > _b ? _a : _b; })
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#endif
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//// Buffers and memory.
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#define mpw_alloc_array(_count, _type, ...) ({ \
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_type stackElements[] = { __VA_ARGS__ }; \
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_count = sizeof( stackElements ) / sizeof( _type ); \
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_type *allocElements = malloc( sizeof( stackElements ) ); \
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memcpy( allocElements, stackElements, sizeof( stackElements ) ); \
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allocElements; \
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})
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/** Push a buffer onto a buffer. reallocs the given buffer and appends the given buffer. */
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bool mpw_push_buf(
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uint8_t **const buffer, size_t *const bufferSize, const void *pushBuffer, const size_t pushSize);
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/** Push a string onto a buffer. reallocs the given buffer and appends the given string. */
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bool mpw_push_string(
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uint8_t **buffer, size_t *const bufferSize, const char *pushString);
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/** Push an integer onto a buffer. reallocs the given buffer and appends the given integer. */
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bool mpw_push_int(
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uint8_t **const buffer, size_t *const bufferSize, const uint32_t pushInt);
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/** Free a buffer after zero'ing its contents. */
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bool mpw_free(
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const void *buffer, const size_t bufferSize);
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/** Free a string after zero'ing its contents. */
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bool mpw_free_string(
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const char *string);
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//// Cryptographic functions.
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/** Perform a scrypt-based key derivation on the given key using the given salt and scrypt parameters.
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* @return A new keySize-size allocated buffer. */
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uint8_t const *mpw_scrypt(
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const size_t keySize, const char *secret, const uint8_t *salt, const size_t saltSize,
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uint64_t N, uint32_t r, uint32_t p);
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/** Calculate a SHA256-based HMAC by encrypting the given salt with the given key.
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* @return A new 32-byte allocated buffer. */
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uint8_t const *mpw_hmac_sha256(
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const uint8_t *key, const size_t keySize, const uint8_t *salt, const size_t saltSize);
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//// Visualizers.
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/** Encode a buffer as a string of hexadecimal characters.
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* @return A C-string in a reused buffer, do not free or store it. */
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const char *mpw_hex(const void *buf, size_t length);
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const char *mpw_hex_l(uint32_t number);
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/** Encode a fingerprint for a buffer.
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* @return A C-string in a reused buffer, do not free or store it. */
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MPKeyID mpw_id_buf(const void *buf, size_t length);
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/** Compare two fingerprints for equality.
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* @return true if the buffers represent identical fingerprints. */
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bool mpw_id_buf_equals(const char *id1, const char *id2);
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/** Encode a visual fingerprint for a user.
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* @return A newly allocated string. */
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const char *mpw_identicon(const char *fullName, const char *masterPassword);
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//// String utilities.
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/** @return The amount of display characters in the given UTF-8 string. */
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const size_t mpw_utf8_strlen(const char *utf8String);
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#endif // _MPW_UTIL_H
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