security-and-privacy/gnupg
security-and-privacy/gnupg
1
0
Fork 0
mirror of git://git.gnupg.org/gnupg.git synced 2025-07-02 22:46:30 +02:00
Code Activity

.

Browse source
This commit is contained in:
Werner Koch 1998-09-18 15:24:53 +00:00
parent 17c023bf69
commit b4aeef458c
38 changed files with 447 additions and 56 deletions
Download patch file Download diff file Expand all files Collapse all files

119
cipher/des.c
View file

@ -112,14 +112,39 @@
*/
#include <config.h>
#include <string.h> /* memcpy, memcmp */
#include <assert.h>
#include "types.h" /* for byte and u32 typedefs */
#include "util.h" /* for log_fatal() */
#include "des.h"
/* Some defines/checks to support standalone modules */
#ifndef CIPHER_ALGO_3DES
#define CIPHER_ALGO_3DES 2
#elif CIPHER_ALGO_3DES != 2
#error CIPHER_ALGO_3DES is defined to a wrong value.
#endif
#ifndef G10ERR_WEAK_KEY
#define G10ERR_WEAK_KEY 43
#elif G10ERR_WEAK_KEY != 43
#error G10ERR_WEAK_KEY is defined to a wrong value.
#endif
#ifndef G10ERR_WRONG_KEYLEN
#define G10ERR_WRONG_KEYLEN 44
#elif G10ERR_WRONG_KEYLEN != 44
#error G10ERR_WRONG_KEYLEN is defined to a wrong value.
#endif
#include <string.h> /* memcpy, memcmp */
typedef unsigned long u32;
typedef unsigned char byte;
/* Macros used by the info function. */
#define FNCCAST_SETKEY(f) ((int(*)(void*, byte*, unsigned))(f))
#define FNCCAST_CRYPT(f) ((void(*)(void*, byte*, byte*))(f))
/*
@ -127,6 +152,7 @@ typedef unsigned char byte;
*/
typedef struct _des_ctx
{
int mode;
u32 encrypt_subkeys[32];
u32 decrypt_subkeys[32];
}
@ -137,6 +163,7 @@ des_ctx[1];
*/
typedef struct _tripledes_ctx
{
int mode;
u32 encrypt_subkeys[96];
u32 decrypt_subkeys[96];
}
@ -499,7 +526,8 @@ des_setkey (struct _des_ctx *ctx, const byte * key)
/*
* Electronic Codebook Mode DES encryption/decryption of data according to 'mode'.
* Electronic Codebook Mode DES encryption/decryption of data according
* to 'mode'.
*/
static int
des_ecb_crypt (struct _des_ctx *ctx, const byte * from, byte * to, int mode)
@ -638,6 +666,16 @@ tripledes_ecb_crypt (struct _tripledes_ctx *ctx, const byte * from, byte * to, i
}
/*
* Check whether the 8 byte key is weak.
*/
static int
is_weak_key ( byte *key )
{
return 0; /* FIXME */
}
/*
* Performs a selftest of this DES/Triple-DES implementation.
@ -652,8 +690,7 @@ selftest (void)
* need this.
*/
if (sizeof (u32) != 4)
return "Wrong word size for DES configured.";
return "Wrong word size for DES configured.";
/*
* DES Maintenance Test
@ -714,3 +751,69 @@ selftest (void)
return 0;
}
static int
do_tripledes_setkey ( struct _tripledes_ctx *ctx, byte *key, unsigned keylen )
{
if( keylen != 24 )
return G10ERR_WRONG_KEYLEN;
if( is_weak_key( key ) || is_weak_key( key+8 ) || is_weak_key( key+16 ) )
return G10ERR_WEAK_KEY;
tripledes_set3keys ( ctx, key, key+8, key+16);
return 0;
}
static void
do_tripledes_encrypt( struct _tripledes_ctx *ctx, byte *outbuf, byte *inbuf )
{
tripledes_ecb_encrypt ( ctx, inbuf, outbuf );
}
static void
do_tripledes_decrypt( struct _tripledes_ctx *ctx, byte *outbuf, byte *inbuf )
{
tripledes_ecb_decrypt ( ctx, inbuf, outbuf );
}
/****************
* Return some information about the algorithm. We need algo here to
* distinguish different flavors of the algorithm.
* Returns: A pointer to string describing the algorithm or NULL if
* the ALGO is invalid.
*/
const char *
des_get_info( int algo, size_t *keylen,
size_t *blocksize, size_t *contextsize,
int (**r_setkey)( void *c, byte *key, unsigned keylen ),
void (**r_encrypt)( void *c, byte *outbuf, byte *inbuf ),
void (**r_decrypt)( void *c, byte *outbuf, byte *inbuf )
)
{
static int did_selftest = 0;
if( !did_selftest ) {
const char *s = selftest();
if( s )
log_fatal("selftest failed: %s", s );
did_selftest = 1;
}
if( algo == CIPHER_ALGO_3DES ) {
*keylen = 192;
*blocksize = 8;
*contextsize = sizeof(struct _tripledes_ctx);
*r_setkey = FNCCAST_SETKEY(do_tripledes_setkey);
*r_encrypt= FNCCAST_CRYPT(do_tripledes_encrypt);
*r_decrypt= FNCCAST_CRYPT(do_tripledes_decrypt);
return "3DES";
}
return NULL;
}