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/*
util.c
Auxiliar functions of 'sks' project
Copyright (C) 2004-2007 Manuel Pancorbo Castro
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Manuel Pancorbo Castro <mpancorbo@gmail.com>
*/
#include <unistd.h>
#include "mycrypt.h"
#include "binasc.h"
#include "sks.h"
#ifdef LINUX
#define ECHO_OFF "stty -echo"
#define ECHO_ON "stty echo"
#elif defined WIN32
#include "conio.h"
/*#define ECHO_OFF "echo off"
#define ECHO_ON "echo on"*/
#else
#error "WIN32 or LINUX must be defined"
#endif
void burn_stack(unsigned long len)
{
unsigned char buf[32];
zeromem(buf, sizeof(buf));
if (len > (unsigned long)sizeof(buf))
burn_stack(len - sizeof(buf));
}
ERROR get_text(FILE *inp, char *frase, const char *msg)
{
char last;
assert((inp != NULL) && (frase != NULL));
if(inp == stdin){
fputs(msg, stderr);
fgets(frase, PASSWD_SIZE, inp);
#if 0
fputs("\n", stderr);
#endif
}
else{
fgets(frase, PASSWD_SIZE, inp);
}
last = frase[strlen(frase)-1];
if((last == '\n') || last == '\r') frase[strlen(frase)-1] = 0;
last = frase[strlen(frase)-1];
if((last == '\n') || last == '\r') frase[strlen(frase)-1] = 0;
return 0;
}
#ifdef WIN32
ERROR get_secret_text(char *pass, int n, const char *msg)
{
int i, x;
_cputs(msg);
for(i = 0; i < n; ++i){
x = (_getch() & 0xff);
if ( (x == '\n') || (x == '\r')){
pass[i] = 0;
break;
}
if(x == '\b'){
_putch(x);
_putch(' ');
_putch(x);
i--;
i = (i < 0)? 0: i;
pass[i--] = 0;
/*_getch();*/
}
else{
pass[i] = (x & 0xff);
_putch( '*' );
}
}
_putch( '\n' );
return 0;
}
#endif
ERROR get_privkey(FILE *inp, PrivKey p, const char *msg)
{
char frase[PASSWD_SIZE];
ERROR err;
memset(frase, 0, PASSWD_SIZE);
#ifdef LINUX
system(ECHO_OFF);
if((err = get_text(inp, frase, msg))) return err;
system(ECHO_ON);
fputs("\n", stderr);
#elif defined WIN32
get_secret_text(frase, PASSWD_SIZE, msg);
#endif
if((err = hash_password( frase, p))) return err;
memset(frase, 0, PASSWD_SIZE);
return 0;
}
void write_longint(FILE *ptr, unsigned long int x, int binmode)
/** In UTF-like stile: data are input in 7-bit chunks; 8th bit
shows if more data should be read **/
{
int out, base = 1 << 7;
while(1){
out = x % base;
x /= base;
if(x) {fputcPlus(out | 0x80, ptr, binmode);}
else{
fputcPlus(out, ptr, binmode);
return;
}
}
}
int read_longint(FILE *ptr, unsigned long int *x, int binmode)
{
int i = 0 ;
unsigned char c;
*x = 0;
while(1){
freadPlus(&c, 1, 1, ptr, binmode);
*x += ((unsigned long int) (c & 0x7f)) << 7*i;
++i;
if(!(c & 0x80)) break;
}
return i;
}
ERROR write_signature(FILE *ptr, sgPair *sig)
{
int binmode = 0;
fwritePlus(sig->r, 1, KEY_SIZE, ptr, binmode);
fwritePlus(sig->s, 1, KEY_SIZE, ptr, binmode);
if(!binmode) flushArmour(ptr);
return 0;
}
ERROR read_signature(FILE *ptr, sgPair *sig, int binmode)
{
if(freadPlus(sig->r, 1, KEY_SIZE, ptr, binmode) != KEY_SIZE)
return -1;
if(freadPlus(sig->s, 1, KEY_SIZE, ptr, binmode) != KEY_SIZE)
return -1;
if(!binmode) burnBinasc();
return 0;
}
int position(FILE * f_inp, /*FILE *f_out,*/ const char *pattern) /* scan ascii file for pattern */
{
while(!feof(f_inp))
{
char buffer[SMALL_BUF];
fgets(buffer, SMALL_BUF, f_inp);
if(!strncasecmp(buffer, pattern, strlen(pattern))) break;
/*if(f_out != NULL){
fputs(buffer, f_out);
fputc('\n', f_out);
}*/
}
if(feof(f_inp))
{
return -1;
}
return 0;
}
int str_match(char *s1, char *s2)
/** Looks for matching substring in main string **/
/** Returns 1 if match and 0 if not **/
{
int i, s1_len, s2_len, main_len, sub_len;
char *main_str, *sub_str;
s1_len = strlen(s1);
s2_len = strlen(s2);
if(s1_len == s2_len)
return !strcasecmp(s1, s2);
else if(s1_len > s2_len){
main_str = s1;
sub_str = s2;
main_len = s1_len;
sub_len = s2_len;
}
else /*if(s2__len > s1_len)*/{
main_str = s2;
sub_str = s1;
main_len = s2_len;
sub_len = s1_len;
}
for(i = 0; i <= main_len - sub_len; ++i){
if(!strncasecmp(main_str + i, sub_str, sub_len))
return 1;
}
return 0;
}
ERROR
fputs_base36(PubKey a, FILE *out)
{
vl_number b;
PubKey hsh;
int i = 0;
char buf[40], x, *p;
hash_binary(hsh, a, GF_SIZE);
// vlOpen(b);
gfZero(b);
vlUnpack(b, hsh);
gf_toradix(b, buf, 36);
p = buf + strlen(buf) - 30;
for(i = 0; i < 30; ++i){
if( (x = p[i]) == 'O') {fputc('o', out);}
else {fputc(x, out);}
if( !((i+1) % 5) ) fputc(' ', out);
}
vlClear(b);
return 0;
}
int char_set_conversion = 0;
void test_charset()
{
#ifdef LINUX
#include <unistd.h>
char_set_conversion = !str_match(getenv("LANG"), "UTF-8");
// char_set_conversion = 0;
#else
char_set_conversion = 1;
#endif
/*fprintf(stderr, "Consersión: %d\n", char_set_conversion);*/
}
static char dest[1024];
char * utf8_to_latin1( char *source)
{
assert(source != NULL);
if(!char_set_conversion) return source;
int i, j, in, out, len;
#ifdef WIN32
unsigned char lat1[] = {225, 233, 237, 243, 250, 252, 241, 231, 193,
201, 205, 211, 218, 220, 209, 199, 161, 191};
unsigned char oem[] = {160, 130, 161, 162, 163, 129, 164, 135, 181,
144, 214, 224, 233, 154, 165, 128, 173, 168, 32};
#endif
len = strlen(source);
memset(dest, 0, len + 1);
for(i = j =0; i < len; ++i){
if((in = source[i]) >= 0x80){
out = (in & 0x1F);
if(((in & 0xE0) != 0xC0) || (out > 3)){
fprintf(stderr, "No válido: c1 = 0x%02x\n", in);
continue;
}
in = source[++i];
if(((in & 0xC0) != 0x80)){
fprintf(stderr, "No válido: c2 = 0x%02x\n", in);
continue;
}
out <<= 6;
out += in & 0x3f;
#ifdef WIN32
/*** CP851 transform ***/
int k;
for(k = 0; k< sizeof(lat1); ++k)
if(out == lat1[k]) break;
out = oem[k];
#endif
}
else out = in;
dest[j++] = out;
if(!out) break;
}
return dest;
}
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