pwldlg.cpp

加密解密,安全工具！很有意思的代码

/*******************************************************************
 *
 *	Copyright (c) 1994-1999 Jetico, Inc., Finland
 *	All rights reserved.
 *
 *	File: pwdlg.cc
 *	Revision:  $Id: pwldlg.cpp,v 1.1 2005/05/12 09:51:39 crypt Rel-1.6-3 $
 *	Created:
 *	Description: implementation of procedures that support 
 *		dialog for accepting user's password and 
 *		support generation of seed value for 
 *		random key generation
 *
 *******************************************************************/


#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <bc_types.h>
#include "kg_defs.h"
#include "kg_misc.h"
#include "pwldlg.h"

char pwldlg_cpp[]="$Id: pwldlg.cpp,v 1.1 2005/05/12 09:51:39 crypt Rel-1.6-3 $";

/* Global data */

// DWORD   SeedCounter, SeedLength;

/* Exported procedures */

DWORD GetPassword( 
			char *text,	// Text, containing filename of the container
			char *caption,	// Caption of the "get password" dialog 
			char   *password 
		)
{
    char *pwd;
    if (text) printf ("%s\n",text);
    if (! (pwd = getpass (caption))) return ERROR_INTERNAL_PROBLEM;
    strncpy(password,pwd,PASSWORD_MAXIMUM_LENGTH);
    ShredData( (BYTE *)pwd, strlen(pwd) );
    return ERROR_NO;
}


DWORD GetPasswordWithVerification(
				char *text,	// Text, containing filename of the container
				char *caption,	// Caption of the "get password" dialog window
				char   *password 
				)
{

    char *pwd;

    if (text) printf ("%s\n",text);

    do 
      if (! (pwd  = getpass (caption))) return ERROR_INTERNAL_PROBLEM;
    while (strlen(pwd) < PASSWORD_MINIMUM_LENGTH && printf("Passwword too short.\n"));
    strncpy(password,pwd,PASSWORD_MAXIMUM_LENGTH);
    ShredData( (BYTE *)pwd, strlen(pwd) );
    
    if (! (pwd = getpass ("Verify password: "))) return ERROR_INTERNAL_PROBLEM;
    if (strlen(pwd) != strlen(password) || strncmp(pwd,password,strlen(pwd) < PASSWORD_MAXIMUM_LENGTH ? strlen(password) : PASSWORD_MAXIMUM_LENGTH))
      return ERROR_USER_PASSWORDS_MISMATCH;
    ShredData( (BYTE *)pwd, strlen(pwd) );

    return ERROR_NO;

}


DWORD GetSeedValue( 
			BYTE  *seed, 
			DWORD seedLength )
{

    FILE *fd;
    
    if (! (fd=fopen("/dev/random","r"))) return ERROR_INTERNAL_PROBLEM;
    
    for ( DWORD i=0; i<seedLength; i++ )
        seed[i]=(char)fgetc(fd);

    fclose (fd);
    return ERROR_NO;
}