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/***************************************************************************
* *
* copyright (C) 2004 by Michael Buesch *
* email: mbuesch@freenet.de *
* *
* hashPassphrase() is derived from GnuPG and is *
* Copyright (C) 1998, 1999, 2000, 2001, 2003 *
* Free Software Foundation, Inc. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License version 2 *
* as published by the Free Software Foundation. *
* *
***************************************************************************/
/***************************************************************************
* copyright (C) 2004 by Ulf Schenk
* This file is originaly based on version 1.1 of pwmanager
* and was modified to run on embedded devices that run microkde
*
* $Id$
**************************************************************************/
#ifndef __LIBGCRYPTIF_H
#define __LIBGCRYPTIF_H
//#undef CONFIG_PWMANAGER_GCRY // for debugging only.
#ifdef CONFIG_PWMANAGER_GCRY
#include <stddef.h>
#include <sys/types.h>
#ifndef _WIN32_
#include <stdint.h>
#else
#define uint8_t Q_UINT8
#define byte Q_UINT8
#define uint32_t Q_UINT32
#endif
#define STRING2KEY_SALTLEN 8
#include "pwmexception.h"
/** interface class for the libgcrypt cipher and hash algorithms
* NOTE: Always allocate 1024 extra bytes for the inBuf (for padding)
*/
class LibGCryptIf
{
protected:
struct STRING2KEY
{
int mode;
int hash_algo;
uint8_t salt[STRING2KEY_SALTLEN];
uint32_t count;
};
struct DEK
{
size_t keylen;
uint8_t key[32]; // this is the largest used keylen (256 bit)
};
public:
LibGCryptIf() { }
/** is libgcrypt available? */
static bool available()
{ return true; }
/** encrypt data. _algo is the PWM_CRYPT_* ID
* of the algorithm.
*/
PwMerror encrypt(unsigned char **outBuf,
size_t *outBufLen,
unsigned char *inBuf,
size_t inBufLen,
const unsigned char *key,
size_t keylen,
char _algo,
char _hashalgo //US BUG: pass _hashalgo because we need it in hashPassphrase
);
/** decrypt data. _algo is the PWM_CRYPT_* ID
* of the algorithm.
*/
PwMerror decrypt(unsigned char **outBuf,
size_t *outBufLen,
const unsigned char *inBuf,
size_t inBufLen,
const unsigned char *key,
size_t keylen,
char _algo,
char _hashalgo //US BUG: pass _hashalgo because we need it in hashPassphrase
);
/** hash data. _algo is the PWM_HASH_* ID of the hash */
PwMerror hash(unsigned char **outBuf,
size_t *outBufLen,
const unsigned char *inBuf,
size_t inBufLen,
char _algo);
/** returns the length of the hash. _algo is the PWM_HASH_*
* id of the hash. returns 0 on error.
*/
unsigned int hashLength(char _algo);
protected:
/** returns the total buffer length */
size_t getBufLen(size_t inBufLen, size_t boundary)
{
return ((boundary - (inBufLen % boundary)) + inBufLen);
}
/** pad the data up to the given boundary.
* "buf" has to be big enough!
*/
void padData(unsigned char *buf,
size_t bufLen,
size_t boundary);
/** unpad the data */
void unpadData(const unsigned char *buf,
size_t *bufLen);
/** maps the PWM_CRYPT_* ID of an algorithm
* to the libgcrypt GCRY_CIPHER_* ID
*/
int mapCipherId(char algo);
/** maps the PWM_HASH_* ID of an algorithm
* to the libgcrypt GCRY_MD_* ID
*/
int mapHashId(char algo);
/** hash a passphrase to a cipher key */
bool hashPassphrase(const unsigned char *pw,
size_t pwlen,
unsigned char *salt,
unsigned char *key,
size_t keylen,
bool create,
char _hashalgo //US BUG: pass _hashalgo because we need it in hashPassphrase
);
/** hash a passphrase to a cipher key */
bool doHashPassphrase(DEK *dek,
const unsigned char *pw,
size_t pwlen,
STRING2KEY *s2k,
bool create);
};
#else // CONFIG_PWMANAGER_GCRY
/** libgcrypt is not installed. This is a NOP wrapper. */
class LibGCryptIf
{
public:
LibGCryptIf() { }
static bool available()
{ return false; }
PwMerror encrypt(unsigned char **,
size_t *,
unsigned char *,
size_t,
const unsigned char *,
size_t,
char)
{ return e_cryptNotImpl; }
PwMerror decrypt(unsigned char **,
size_t *,
const unsigned char *,
size_t,
const unsigned char *,
size_t,
char)
{ return e_cryptNotImpl; }
PwMerror hash(unsigned char **,
size_t *,
const unsigned char *,
size_t,
char)
{ return e_hashNotImpl; }
unsigned int hashLength(char)
{ return 0; }
};
#endif // CONFIG_PWMANAGER_GCRY
#endif // __LIBGCRYPTIF_H
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