259 lines
6.1 KiB
C
259 lines
6.1 KiB
C
/*
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* Copyright (C) 1998,1999,2000 Nikos Mavroyanopoulos
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Library General Public License as published
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* by 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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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* $Id: mcrypt.c,v 1.19 2002/07/06 10:18:18 nmav Exp $ */
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/* Changed by Steve Underwood 1999/12/10 to allow an arbitrary number of
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* streams of encryption. Currently the resulting code is probably not
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* thread safe, but as far as I could tell the previous code wasn't
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* either. This version has brute force locking in a lot of places, but
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* it has not been tested in a multi-threaded manner.
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* The key locking issue is that the table of encryption streams could
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* be moved when it is extended. Any address pre-calculated, or in
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* calculation at the time of the reallocation would be screwed.
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* This won't happen often, but requires lots of locks - PITA!
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*/
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/* Changed again at 1999/12/15 to correct the thread safeness. Now it
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* seems to be thread safe. Brute force locking was removed and
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* locks per thread were introduced.
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* --nikos
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*/
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/* The above comments are too old! */
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#ifndef LIBDEFS_H
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#define LIBDEFS_H
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#include <libdefs.h>
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#endif
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#include <bzero.h>
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#include <xmemory.h>
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#include <mcrypt_internal.h>
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#if 0
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static int preloaded_symbols = 0;
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#endif
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static int internal_end_mcrypt(MCRYPT td);
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static int internal_init_mcrypt(MCRYPT td, const void *key, int lenofkey, const void *IV)
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{
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int *sizes = NULL;
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int num_of_sizes, i, ok = 0;
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int key_size = mcrypt_enc_get_key_size(td);
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if (lenofkey > key_size || lenofkey==0) {
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return MCRYPT_KEY_LEN_ERROR; /* error */
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}
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sizes = mcrypt_enc_get_supported_key_sizes(td, &num_of_sizes);
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if (sizes != NULL) {
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for (i = 0; i < num_of_sizes; i++) {
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if (lenofkey == sizes[i]) {
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ok = 1;
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break;
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}
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}
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} else { /* sizes==NULL */
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if (num_of_sizes == 0
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&& lenofkey <= mcrypt_enc_get_key_size(td))
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ok = 1;
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}
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if (ok == 0) { /* not supported key size */
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key_size = mcrypt_enc_get_key_size(td);
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if (sizes != NULL) {
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for (i = 0; i < num_of_sizes; i++) {
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if (lenofkey <= sizes[i]) {
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key_size = sizes[i];
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break;
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}
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}
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} else { /* well every key size is supported! */
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key_size = lenofkey;
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}
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} else {
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key_size = lenofkey;
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}
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free(sizes);
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td->keyword_given = mxcalloc(1, mcrypt_enc_get_key_size(td));
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if (td->keyword_given==NULL) return MCRYPT_MEMORY_ALLOCATION_ERROR;
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memmove(td->keyword_given, key, lenofkey);
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i = mcrypt_get_size(td);
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td->akey = mxcalloc(1, i);
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if (td->akey==NULL) {
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free(td->keyword_given);
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return MCRYPT_MEMORY_ALLOCATION_ERROR;
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}
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i = mcrypt_mode_get_size(td);
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if (i > 0) {
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td->abuf = mxcalloc(1, i);
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if (td->abuf==NULL) {
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free(td->keyword_given);
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free(td->akey);
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return MCRYPT_MEMORY_ALLOCATION_ERROR;
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}
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}
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ok = init_mcrypt(td, td->abuf, key, key_size, IV);
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if (ok!=0) {
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free(td->keyword_given);
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free(td->akey);
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free(td->abuf);
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return MCRYPT_UNKNOWN_ERROR; /* algorithm error */
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}
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ok = mcrypt_set_key(td,
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(void *) td->akey,
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(void *) td->keyword_given,
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key_size, IV, IV!=NULL ? mcrypt_enc_get_iv_size(td) : 0);
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if (ok!=0) {
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internal_end_mcrypt(td);
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return MCRYPT_UNKNOWN_ERROR; /* algorithm error */
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}
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return 0;
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}
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static int internal_end_mcrypt(MCRYPT td)
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{
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mxfree(td->keyword_given, mcrypt_enc_get_key_size(td));
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td->keyword_given = NULL;
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mxfree(td->akey, mcrypt_get_size(td));
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td->akey = NULL;
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end_mcrypt(td, td->abuf);
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if (td->abuf!=NULL) mxfree(td->abuf, mcrypt_mode_get_size(td));
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td->abuf = NULL;
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return 0;
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}
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/* Generic - High level functions */
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WIN32DLL_DEFINE
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int mcrypt_generic_init(const MCRYPT td, const void *key, int lenofkey, const void *IV)
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{
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return internal_init_mcrypt(td, key, lenofkey, IV);
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}
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WIN32DLL_DEFINE
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int mcrypt_generic(MCRYPT td, void *plaintext, int len)
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{
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int x;
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x = mcrypt(td, td->abuf, plaintext, len);
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return x;
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}
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WIN32DLL_DEFINE
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int mdecrypt_generic(MCRYPT td, void *ciphertext, int len)
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{
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int x;
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x = mdecrypt(td, td->abuf, ciphertext, len);
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return x;
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}
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WIN32DLL_DEFINE
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int mcrypt_generic_end( MCRYPT td)
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{
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if (td==NULL) return MCRYPT_UNKNOWN_ERROR;
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if (td->keyword_given!=NULL)
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internal_end_mcrypt(td);
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mcrypt_module_close(td);
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return 0;
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}
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WIN32DLL_DEFINE
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int mcrypt_generic_deinit( MCRYPT td)
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{
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if (td==NULL || td->keyword_given==NULL) return MCRYPT_UNKNOWN_ERROR;
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internal_end_mcrypt(td);
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return 0;
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}
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WIN32DLL_DEFINE
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void mcrypt_perror(int err)
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{
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switch (err) {
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case MCRYPT_UNKNOWN_ERROR:
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fprintf(stderr, "Unknown error.\n");
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break;
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case MCRYPT_ALGORITHM_MODE_INCOMPATIBILITY:
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fprintf(stderr,
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"Algorithm incompatible with this mode.\n");
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break;
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case MCRYPT_KEY_LEN_ERROR:
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fprintf(stderr, "Key length is not legal.\n");
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break;
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case MCRYPT_MEMORY_ALLOCATION_ERROR:
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fprintf(stderr, "Memory allocation failed.\n");
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break;
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case MCRYPT_UNKNOWN_MODE:
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fprintf(stderr, "Unknown mode.\n");
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break;
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case MCRYPT_UNKNOWN_ALGORITHM:
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fprintf(stderr, "Unknown algorithm.\n");
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break;
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}
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return;
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}
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WIN32DLL_DEFINE
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const char* mcrypt_strerror(int err)
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{
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switch (err) {
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case MCRYPT_UNKNOWN_ERROR:
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return "Unknown error.\n";
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break;
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case MCRYPT_ALGORITHM_MODE_INCOMPATIBILITY:
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return "Algorithm incompatible with this mode.\n";
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break;
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case MCRYPT_KEY_LEN_ERROR:
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return "Key length is not legal.\n";
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break;
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case MCRYPT_MEMORY_ALLOCATION_ERROR:
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return "Memory allocation failed.\n";
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break;
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case MCRYPT_UNKNOWN_MODE:
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return "Unknown mode.\n";
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break;
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case MCRYPT_UNKNOWN_ALGORITHM:
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return "Unknown algorithm.\n";
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break;
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}
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return NULL;
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}
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WIN32DLL_DEFINE
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void mcrypt_free(void *ptr)
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{
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free(ptr);
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}
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