mirror of
git://git.gnupg.org/gnupg.git
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164 lines
3.8 KiB
C
164 lines
3.8 KiB
C
/* passphrase.c - Get a passphrase
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* Copyright (C) 1998 Free Software Foundation, Inc.
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*
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* This file is part of GNUPG.
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*
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* GNUPG 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 2 of the License, or
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* (at your option) any later version.
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*
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* GNUPG 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 should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <assert.h>
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#include "util.h"
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#include "memory.h"
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#include "options.h"
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#include "ttyio.h"
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#include "cipher.h"
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#include "keydb.h"
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static int pwfd = -1;
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static int hash_passphrase( DEK *dek, char *pw, byte *salt );
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void
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set_passphrase_fd( int fd )
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{
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pwfd = fd;
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}
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int
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get_passphrase_fd()
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{
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return pwfd;
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}
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/****************
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* Get a passphrase for the secret key with KEYID, display TEXT
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* if the user needs to enter the passphrase.
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* Returns: m_alloced md5 passphrase hash; caller must free
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*/
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DEK *
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get_passphrase_hash( u32 *keyid, char *text, byte *salt )
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{
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char *pw;
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DEK *dek;
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if( keyid && !opt.batch ) {
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char *ustr;
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tty_printf("Need a pass phrase to unlock the secret key for:\n");
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tty_printf(" \"" );
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ustr = get_user_id_string( keyid );
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tty_print_string( ustr, strlen(ustr) );
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m_free(ustr);
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tty_printf("\"\n\n");
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}
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if( pwfd != -1 ) { /* read the passphrase from the given descriptor */
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int i, len;
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if( !opt.batch )
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tty_printf("Reading from file descriptor %d ...", pwfd );
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for( pw = NULL, i = len = 100; ; i++ ) {
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if( i >= len-1 ) {
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char *pw2 = pw;
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len += 100;
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pw = m_alloc_secure( len );
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if( pw2 )
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memcpy(pw, pw2, i );
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i=0;
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}
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if( read( pwfd, pw+i, 1) != 1 || pw[i] == '\n' )
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break;
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}
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pw[i] = 0;
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if( !opt.batch )
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tty_printf("\b\b\b \n" );
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}
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else if( opt.batch )
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log_fatal("Can't query password in batchmode\n");
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else {
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pw = tty_get_hidden("Enter pass phrase: " );
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tty_kill_prompt();
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}
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dek = m_alloc_secure( sizeof *dek );
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dek->algo = CIPHER_ALGO_BLOWFISH; /* fixme: allow others ciphers */
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if( hash_passphrase( dek, pw, salt ) )
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log_bug("get_passphrase_hash\n");
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m_free(pw); /* is allocated in secure memory, so it will be burned */
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return dek;
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}
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/****************
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* This function is used to construct a DEK from a user input.
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* It uses the default CIPHER. If salt is != NULL, include these
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* 8 bytes in the hash.
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* Returns: 0 = okay, -1 No passphrase entered, > 0 error
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*/
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int
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make_dek_from_passphrase( DEK *dek, int mode, byte *salt )
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{
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char *pw, *pw2;
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int rc=0;
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pw = tty_get_hidden("Enter pass phrase: " );
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tty_kill_prompt();
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if( mode == 2 ) {
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pw2 = tty_get_hidden("Repeat pass phrase: " );
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tty_kill_prompt();
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if( strcmp(pw, pw2) ) {
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m_free(pw2);
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m_free(pw);
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return G10ERR_PASSPHRASE;
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}
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m_free(pw2);
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}
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if( !*pw )
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rc = -1;
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else
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rc = hash_passphrase( dek, pw, salt );
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m_free(pw);
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return rc;
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}
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static int
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hash_passphrase( DEK *dek, char *pw, byte *salt )
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{
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int rc = 0;
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dek->keylen = 0;
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if( dek->algo == CIPHER_ALGO_BLOWFISH ) {
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MD_HANDLE md;
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md = md_open(DIGEST_ALGO_RMD160, 1);
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if( salt )
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md_write( md, salt, 8 );
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md_write( md, pw, strlen(pw) );
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md_final( md );
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dek->keylen = 20;
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memcpy( dek->key, md_read(md,0), dek->keylen );
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md_close(md);
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}
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else
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rc = G10ERR_UNSUPPORTED;
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return rc;
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}
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