libmcrypt/lib/mcrypt.c

/*
 * Copyright (C) 1998,1999,2000 Nikos Mavroyanopoulos
 * 
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Library General Public License as published 
 * by the Free Software Foundation; either version 2 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/* $Id: mcrypt.c,v 1.2 2000/09/04 13:02:11 nmav Exp $ */

/* Changed by Steve Underwood 1999/12/10 to allow an arbitrary number of 
 * streams of encryption. Currently the resulting code is probably not
 * thread safe, but as far as I could tell the previous code wasn't
 * either. This version has brute force locking in a lot of places, but
 * it has not been tested in a multi-threaded manner.
 * The key locking issue is that the table of encryption streams could
 * be moved when it is extended. Any address pre-calculated, or in
 * calculation at the time of the reallocation would be screwed.
 * This won't happen often, but requires lots of locks - PITA! 
 */

/* Changed again at 1999/12/15 to correct the thread safeness. Now it
 * seems to be thread safe. Brute force locking was removed and
 * locks per thread were introduced. 
 *                                              --nikos
 */

#ifndef LIBDEFS_H
#define LIBDEFS_H
#include <libdefs.h>
#endif
#include <bzero.h>
#include <xmemory.h>
#include <mcrypt_internal.h>

#if 0
static int preloaded_symbols = 0;
#endif

static int internal_end_mcrypt(MCRYPT td);

static int internal_init_mcrypt(MCRYPT td, void *key, int lenofkey, void *IV)
{
        int *sizes = NULL;
        int num_of_sizes, i, ok = 0;

        if (lenofkey == 0) {
                return MCRYPT_KEY_LEN_ERROR;    /* error */
        }

        sizes = mcrypt_enc_get_supported_key_sizes(td, &num_of_sizes);
        if (sizes != NULL) {
                for (i = 0; i < num_of_sizes; i++) {
                        if (lenofkey == sizes[i]) {
                                ok = 1;
                                break;
                        }
                }
        } else {                /* sizes==NULL */
                if (num_of_sizes == 0
                    && lenofkey <= mcrypt_enc_get_key_size(td))
                        ok = 1;
        }

        free(sizes);
        if (ok == 0) {
                return MCRYPT_KEY_LEN_ERROR;
        }

        td->keyword_given = mxcalloc(1, mcrypt_enc_get_key_size(td));
        memmove(td->keyword_given, key, lenofkey);
        td->akey = mxcalloc(1, mcrypt_get_size(td));
        td->abuf = mxcalloc(1, mcrypt_mode_get_size(td));

        init_mcrypt(td, td->abuf, key, lenofkey, IV);

        mcrypt_set_key(td,
                       (void *) td->akey,
                       (void *) td->keyword_given,
                       lenofkey, IV, mcrypt_enc_get_iv_size(td));

        if (td->akey == NULL) {
                internal_end_mcrypt(td);
                return MCRYPT_UNKNOWN_ERROR;
        }
        return 0;
}

static int internal_end_mcrypt(MCRYPT td)
{
        mxfree(td->keyword_given, mcrypt_enc_get_key_size(td));
        td->keyword_given = NULL;

        mxfree(td->akey, mcrypt_get_size(td));
        td->akey = NULL;

        end_mcrypt(td, td->abuf);
        mxfree(td->abuf, mcrypt_mode_get_size(td));
        td->abuf = NULL;

        return 0;
}

/* Generic - High level functions */

WIN32DLL_DEFINE
int mcrypt_generic_init(const MCRYPT td, void *key, int lenofkey, void *IV)
{
        return internal_init_mcrypt(td, key, lenofkey, IV);
}

WIN32DLL_DEFINE
int mcrypt_generic(MCRYPT td, void *plaintext, int len)
{
        int x;

        x = mcrypt(td, td->abuf, plaintext, len);
        return x;
}

WIN32DLL_DEFINE
int mdecrypt_generic(MCRYPT td, void *ciphertext, int len)
{
        int x;
        x = mdecrypt(td, td->abuf, ciphertext, len);
        return x;
}

WIN32DLL_DEFINE
int mcrypt_generic_end(const MCRYPT td)
{
        internal_end_mcrypt(td);
        mcrypt_module_close(td);
        return 0;
}

WIN32DLL_DEFINE
void mcrypt_perror(int err)
{

        switch (err) {
        case MCRYPT_UNKNOWN_ERROR:
                fprintf(stderr, "Unknown error.\n");
                break;
        case MCRYPT_ALGORITHM_MODE_INCOMPATIBILITY:
                fprintf(stderr,
                        "Algorithm incompatible with this mode.\n");
                break;
        case MCRYPT_KEY_LEN_ERROR:
                fprintf(stderr, "Key length is not legal.\n");
                break;
        case MCRYPT_MEMORY_ALLOCATION_ERROR:
                fprintf(stderr, "Memory allocation failed.\n");
                break;
        case MCRYPT_UNKNOWN_MODE:
                fprintf(stderr, "Unknown mode.\n");
                break;
        case MCRYPT_UNKNOWN_ALGORITHM:
                fprintf(stderr, "Unknown algorithm.\n");
                break;

        }
        return;
}

WIN32DLL_DEFINE
int mcrypt_free(void *ptr)
{
        free(ptr);
        return 0;
}
1	nmav	1.1	/*
2			* Copyright (C) 1998,1999,2000 Nikos Mavroyanopoulos
3			*
4			* This library is free software; you can redistribute it and/or modify it
5			* under the terms of the GNU Library General Public License as published
6			* by the Free Software Foundation; either version 2 of the License, or
7			* (at your option) any later version.
8			*
9			* This library is distributed in the hope that it will be useful,
10			* but WITHOUT ANY WARRANTY; without even the implied warranty of
11			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12			* Library General Public License for more details.
13			*
14			* You should have received a copy of the GNU Library General Public
15			* License along with this library; if not, write to the
16			* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17			* Boston, MA 02111-1307, USA.
18			*/
19
20	nmav	1.3	/* $Id: mcrypt.c,v 1.2 2000/09/04 13:02:11 nmav Exp $ */
21	nmav	1.1
22			/* Changed by Steve Underwood 1999/12/10 to allow an arbitrary number of
23			* streams of encryption. Currently the resulting code is probably not
24			* thread safe, but as far as I could tell the previous code wasn't
25			* either. This version has brute force locking in a lot of places, but
26			* it has not been tested in a multi-threaded manner.
27			* The key locking issue is that the table of encryption streams could
28			* be moved when it is extended. Any address pre-calculated, or in
29			* calculation at the time of the reallocation would be screwed.
30			* This won't happen often, but requires lots of locks - PITA!
31			*/
32
33			/* Changed again at 1999/12/15 to correct the thread safeness. Now it
34			* seems to be thread safe. Brute force locking was removed and
35			* locks per thread were introduced.
36			* --nikos
37			*/
38
39			#ifndef LIBDEFS_H
40			#define LIBDEFS_H
41			#include <libdefs.h>
42			#endif
43			#include <bzero.h>
44			#include <xmemory.h>
45			#include <mcrypt_internal.h>
46
47			#if 0
48			static int preloaded_symbols = 0;
49			#endif
50
51	nmav	1.2	static int internal_end_mcrypt(MCRYPT td);
52	nmav	1.1
53	nmav	1.2	static int internal_init_mcrypt(MCRYPT td, void key, int lenofkey, void IV)
54	nmav	1.1	{
55			int *sizes = NULL;
56			int num_of_sizes, i, ok = 0;
57
58			if (lenofkey == 0) {
59			return MCRYPT_KEY_LEN_ERROR; /* error */
60			}
61
62			sizes = mcrypt_enc_get_supported_key_sizes(td, &num_of_sizes);
63			if (sizes != NULL) {
64			for (i = 0; i < num_of_sizes; i++) {
65			if (lenofkey == sizes[i]) {
66			ok = 1;
67			break;
68			}
69			}
70			} else { /* sizes==NULL */
71			if (num_of_sizes == 0
72			&& lenofkey <= mcrypt_enc_get_key_size(td))
73			ok = 1;
74			}
75
76	nmav	1.2	free(sizes);
77	nmav	1.1	if (ok == 0) {
78			return MCRYPT_KEY_LEN_ERROR;
79			}
80
81			td->keyword_given = mxcalloc(1, mcrypt_enc_get_key_size(td));
82			memmove(td->keyword_given, key, lenofkey);
83			td->akey = mxcalloc(1, mcrypt_get_size(td));
84			td->abuf = mxcalloc(1, mcrypt_mode_get_size(td));
85
86			init_mcrypt(td, td->abuf, key, lenofkey, IV);
87
88			mcrypt_set_key(td,
89			(void *) td->akey,
90			(void *) td->keyword_given,
91			lenofkey, IV, mcrypt_enc_get_iv_size(td));
92
93			if (td->akey == NULL) {
94			internal_end_mcrypt(td);
95			return MCRYPT_UNKNOWN_ERROR;
96			}
97			return 0;
98			}
99
100	nmav	1.3	static int internal_end_mcrypt(MCRYPT td)
101	nmav	1.1	{
102			mxfree(td->keyword_given, mcrypt_enc_get_key_size(td));
103			td->keyword_given = NULL;
104
105			mxfree(td->akey, mcrypt_get_size(td));
106			td->akey = NULL;
107
108			end_mcrypt(td, td->abuf);
109			mxfree(td->abuf, mcrypt_mode_get_size(td));
110			td->abuf = NULL;
111
112			return 0;
113			}
114
115			/* Generic - High level functions */
116
117	nmav	1.3	WIN32DLL_DEFINE
118	nmav	1.1	int mcrypt_generic_init(const MCRYPT td, void key, int lenofkey, void IV)
119			{
120			return internal_init_mcrypt(td, key, lenofkey, IV);
121			}
122
123	nmav	1.3	WIN32DLL_DEFINE
124	nmav	1.1	int mcrypt_generic(MCRYPT td, void *plaintext, int len)
125			{
126			int x;
127
128			x = mcrypt(td, td->abuf, plaintext, len);
129			return x;
130			}
131
132	nmav	1.3	WIN32DLL_DEFINE
133	nmav	1.1	int mdecrypt_generic(MCRYPT td, void *ciphertext, int len)
134			{
135			int x;
136			x = mdecrypt(td, td->abuf, ciphertext, len);
137			return x;
138			}
139
140	nmav	1.3	WIN32DLL_DEFINE
141	nmav	1.1	int mcrypt_generic_end(const MCRYPT td)
142			{
143			internal_end_mcrypt(td);
144			mcrypt_module_close(td);
145			return 0;
146			}
147
148	nmav	1.3	WIN32DLL_DEFINE
149	nmav	1.1	void mcrypt_perror(int err)
150			{
151
152			switch (err) {
153			case MCRYPT_UNKNOWN_ERROR:
154			fprintf(stderr, "Unknown error.\n");
155			break;
156			case MCRYPT_ALGORITHM_MODE_INCOMPATIBILITY:
157			fprintf(stderr,
158			"Algorithm incompatible with this mode.\n");
159			break;
160			case MCRYPT_KEY_LEN_ERROR:
161			fprintf(stderr, "Key length is not legal.\n");
162			break;
163			case MCRYPT_MEMORY_ALLOCATION_ERROR:
164			fprintf(stderr, "Memory allocation failed.\n");
165			break;
166			case MCRYPT_UNKNOWN_MODE:
167			fprintf(stderr, "Unknown mode.\n");
168			break;
169			case MCRYPT_UNKNOWN_ALGORITHM:
170			fprintf(stderr, "Unknown algorithm.\n");
171			break;
172
173			}
174			return;
175			}
176
177	nmav	1.3	WIN32DLL_DEFINE
178	nmav	1.1	int mcrypt_free(void *ptr)
179			{
180			free(ptr);
181			return 0;
182			}