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MasterPassword/core/c/mpw-util.c

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//
// mpw-util.c
// MasterPassword
//
// Created by Maarten Billemont on 2014-12-20.
// Copyright (c) 2014 Lyndir. All rights reserved.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#ifdef COLOR
#include <unistd.h>
#include <curses.h>
#include <term.h>
#endif
#include <scrypt/sha256.h>
#include <scrypt/crypto_scrypt.h>
#include "mpw-util.h"
void mpw_push_buf(uint8_t **const buffer, size_t *const bufferSize, const void *pushBuffer, const size_t pushSize) {
if (*bufferSize == (size_t)-1)
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// The buffer was marked as broken, it is missing a previous push. Abort to avoid corrupt content.
return;
*bufferSize += pushSize;
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uint8_t *resizedBuffer = realloc( *buffer, *bufferSize );
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if (!resizedBuffer) {
// realloc failed, we can't push. Mark the buffer as broken.
mpw_free( *buffer, *bufferSize - pushSize );
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*bufferSize = (size_t)-1;
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*buffer = NULL;
return;
}
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*buffer = resizedBuffer;
uint8_t *pushDst = *buffer + *bufferSize - pushSize;
memcpy( pushDst, pushBuffer, pushSize );
}
void mpw_push_string(uint8_t **buffer, size_t *const bufferSize, const char *pushString) {
mpw_push_buf( buffer, bufferSize, pushString, strlen( pushString ) );
}
void mpw_push_int(uint8_t **const buffer, size_t *const bufferSize, const uint32_t pushInt) {
mpw_push_buf( buffer, bufferSize, &pushInt, sizeof( pushInt ) );
}
void mpw_free(const void *buffer, const size_t bufferSize) {
if (buffer) {
memset( (void *)buffer, 0, bufferSize );
free( (void *)buffer );
}
}
void mpw_free_string(const char *string) {
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mpw_free( string, strlen( string ) );
}
uint8_t const *mpw_scrypt(const size_t keySize, const char *secret, const uint8_t *salt, const size_t saltSize,
uint64_t N, uint32_t r, uint32_t p) {
if (!secret || !salt)
return NULL;
uint8_t *key = malloc( keySize );
if (!key)
return NULL;
if (crypto_scrypt( (const uint8_t *)secret, strlen( secret ), salt, saltSize, N, r, p, key, keySize ) < 0) {
mpw_free( key, keySize );
return NULL;
}
return key;
}
uint8_t const *mpw_hmac_sha256(const uint8_t *key, const size_t keySize, const uint8_t *salt, const size_t saltSize) {
uint8_t *const buffer = malloc( 32 );
if (!buffer)
return NULL;
HMAC_SHA256_Buf( key, keySize, salt, saltSize, buffer );
return buffer;
}
const char *mpw_id_buf(const void *buf, size_t length) {
uint8_t hash[32];
SHA256_Buf( buf, length, hash );
return mpw_hex( hash, 32 );
}
static char **mpw_hex_buf = NULL;
static unsigned int mpw_hex_buf_i = 0;
const char *mpw_hex(const void *buf, size_t length) {
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// FIXME
if (!mpw_hex_buf) {
mpw_hex_buf = malloc( 10 * sizeof( char * ) );
for (uint8_t i = 0; i < 10; ++i)
mpw_hex_buf[i] = NULL;
}
mpw_hex_buf_i = (mpw_hex_buf_i + 1) % 10;
mpw_hex_buf[mpw_hex_buf_i] = realloc( mpw_hex_buf[mpw_hex_buf_i], length * 2 + 1 );
for (size_t kH = 0; kH < length; kH++)
sprintf( &(mpw_hex_buf[mpw_hex_buf_i][kH * 2]), "%02X", ((const uint8_t *)buf)[kH] );
return mpw_hex_buf[mpw_hex_buf_i];
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}
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const char *mpw_hex_l(uint32_t number) {
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return mpw_hex( &number, sizeof( number ) );
}
#ifdef COLOR
static int putvari;
static char *putvarc = NULL;
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static int termsetup;
static int initputvar() {
if (!isatty(STDERR_FILENO))
return 0;
if (putvarc)
free(putvarc);
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if (!termsetup) {
int status;
if (! (termsetup = (setupterm(NULL, STDERR_FILENO, &status) == OK && status == 1))) {
wrn( "Terminal doesn't support color (setupterm errno %d).\n", status );
return 0;
}
}
putvarc=(char *)calloc(256, sizeof(char));
putvari=0;
return 1;
}
static int putvar(int c) {
putvarc[putvari++]=c;
return 0;
}
#endif
const char *mpw_identicon(const char *fullName, const char *masterPassword) {
const char *leftArm[] = { "", "", "", "" };
const char *rightArm[] = { "", "", "", "" };
const char *body[] = { "", "", "", "", "", "" };
const char *accessory[] = {
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", ""
};
uint8_t identiconSeed[32];
HMAC_SHA256_Buf( masterPassword, strlen( masterPassword ), fullName, strlen( fullName ), identiconSeed );
char *colorString, *resetString;
#ifdef COLOR
if (initputvar()) {
uint8_t colorIdentifier = (uint8_t)(identiconSeed[4] % 7 + 1);
tputs(tparm(tgetstr("AF", NULL), colorIdentifier), 1, putvar);
colorString = calloc(strlen(putvarc) + 1, sizeof(char));
strcpy(colorString, putvarc);
tputs(tgetstr("me", NULL), 1, putvar);
resetString = calloc(strlen(putvarc) + 1, sizeof(char));
strcpy(resetString, putvarc);
} else
#endif
{
colorString = calloc( 1, sizeof( char ) );
resetString = calloc( 1, sizeof( char ) );
}
char *identicon = (char *)calloc( 256, sizeof( char ) );
snprintf( identicon, 256, "%s%s%s%s%s%s",
colorString,
leftArm[identiconSeed[0] % (sizeof( leftArm ) / sizeof( leftArm[0] ))],
body[identiconSeed[1] % (sizeof( body ) / sizeof( body[0] ))],
rightArm[identiconSeed[2] % (sizeof( rightArm ) / sizeof( rightArm[0] ))],
accessory[identiconSeed[3] % (sizeof( accessory ) / sizeof( accessory[0] ))],
resetString );
free( colorString );
free( resetString );
return identicon;
}
/**
* @return the amount of bytes used by UTF-8 to encode a single character that starts with the given byte.
*/
static int mpw_utf8_sizeof(unsigned char utf8Byte) {
if (!utf8Byte)
return 0;
if ((utf8Byte & 0x80) == 0)
return 1;
if ((utf8Byte & 0xC0) != 0xC0)
return 0;
if ((utf8Byte & 0xE0) == 0xC0)
return 2;
if ((utf8Byte & 0xF0) == 0xE0)
return 3;
if ((utf8Byte & 0xF8) == 0xF0)
return 4;
return 0;
}
const size_t mpw_utf8_strlen(const char *utf8String) {
size_t charlen = 0;
char *remainingString = (char *)utf8String;
for (int charByteSize; (charByteSize = mpw_utf8_sizeof( (unsigned char)*remainingString )); remainingString += charByteSize)
++charlen;
return charlen;
}