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/* passphrase.c - Get a passphrase
* Copyright (C) 1998 Free Software Foundation, Inc.
*
* This file is part of GNUPG.
*
* GNUPG 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.
*
* GNUPG 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
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include "util.h"
#include "memory.h"
#include "options.h"
#include "ttyio.h"
#include "cipher.h"
#include "keydb.h"
static int pwfd = -1;
static int hash_passphrase( DEK *dek, char *pw, byte *salt );
void
set_passphrase_fd( int fd )
{
pwfd = fd;
}
int
get_passphrase_fd()
{
return pwfd;
}
/****************
* Get a passphrase for the secret key with KEYID, display TEXT
* if the user needs to enter the passphrase.
* Returns: m_alloced md5 passphrase hash; caller must free
*/
DEK *
get_passphrase_hash( u32 *keyid, char *text, byte *salt )
{
char *pw;
DEK *dek;
if( keyid && !opt.batch ) {
char *ustr;
tty_printf("Need a pass phrase to unlock the secret key for:\n");
tty_printf(" \"" );
ustr = get_user_id_string( keyid );
tty_print_string( ustr, strlen(ustr) );
m_free(ustr);
tty_printf("\"\n\n");
}
if( pwfd != -1 ) { /* read the passphrase from the given descriptor */
int i, len;
if( !opt.batch )
tty_printf("Reading from file descriptor %d ...", pwfd );
for( pw = NULL, i = len = 100; ; i++ ) {
if( i >= len-1 ) {
char *pw2 = pw;
len += 100;
pw = m_alloc_secure( len );
if( pw2 )
memcpy(pw, pw2, i );
i=0;
}
if( read( pwfd, pw+i, 1) != 1 || pw[i] == '\n' )
break;
}
pw[i] = 0;
if( !opt.batch )
tty_printf("\b\b\b \n" );
}
else if( opt.batch )
log_fatal("Can't query password in batchmode\n");
else {
pw = tty_get_hidden("Enter pass phrase: " );
tty_kill_prompt();
}
dek = m_alloc_secure( sizeof *dek );
dek->algo = CIPHER_ALGO_BLOWFISH; /* fixme: allow others ciphers */
if( hash_passphrase( dek, pw, salt ) )
log_bug("get_passphrase_hash\n");
m_free(pw); /* is allocated in secure memory, so it will be burned */
return dek;
}
/****************
* This function is used to construct a DEK from a user input.
* It uses the default CIPHER. If salt is != NULL, include these
* 8 bytes in the hash.
* Returns: 0 = okay, -1 No passphrase entered, > 0 error
*/
int
make_dek_from_passphrase( DEK *dek, int mode, byte *salt )
{
char *pw, *pw2;
int rc=0;
pw = tty_get_hidden("Enter pass phrase: " );
tty_kill_prompt();
if( mode == 2 ) {
pw2 = tty_get_hidden("Repeat pass phrase: " );
tty_kill_prompt();
if( strcmp(pw, pw2) ) {
m_free(pw2);
m_free(pw);
return G10ERR_PASSPHRASE;
}
m_free(pw2);
}
if( !*pw )
rc = -1;
else
rc = hash_passphrase( dek, pw, salt );
m_free(pw);
return rc;
}
static int
hash_passphrase( DEK *dek, char *pw, byte *salt )
{
int rc = 0;
dek->keylen = 0;
if( dek->algo == CIPHER_ALGO_BLOWFISH ) {
MD_HANDLE md;
md = md_open(DIGEST_ALGO_RMD160, 1);
if( salt )
md_write( md, salt, 8 );
md_write( md, pw, strlen(pw) );
md_final( md );
dek->keylen = 20;
memcpy( dek->key, md_read(md,0), dek->keylen );
md_close(md);
}
else
rc = G10ERR_UNSUPPORTED;
return rc;
}
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