mirror of git://git.gnupg.org/gnupg.git
128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/* passphrase.c - Get a passphrase
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 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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* G10 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 <assert.h>
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#include "util.h"
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#include "memory.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 hash_passphrase( DEK *dek, char *pw );
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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 )
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{
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char *p=NULL, *pw;
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DEK *dek;
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if( keyid ) {
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char *ustr;
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tty_printf("\nNeed a pass phrase to unlock the secret key!\n");
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tty_printf("KeyID: " );
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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( keyid && (p=getenv("G10PASSPHRASE")) ) {
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pw = m_alloc_secure(strlen(p)+1);
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strcpy(pw,p);
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tty_printf("Taking it from $G10PASSPHRASE !\n", keyid[1] );
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}
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else
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pw = tty_get_hidden("Enter pass phrase: " );
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dek = m_alloc_secure( sizeof *dek );
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dek->algo = CIPHER_ALGO_BLOWFISH;
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if( hash_passphrase( dek, pw ) )
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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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if( !p ) {
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tty_kill_prompt();
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tty_printf("\n");
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}
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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
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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 )
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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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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 );
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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 )
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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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RMDHANDLE rmd;
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rmd = rmd160_open(1);
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rmd160_write( rmd, pw, strlen(pw) );
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dek->keylen = 20;
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memcpy( dek->key, rmd160_final(rmd), dek->keylen );
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rmd160_close(rmd);
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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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