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/* |
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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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|
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/* $Id: mcrypt.c,v 1.6 2001/01/17 19:37:56 nmav Exp $ */ |
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|
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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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|
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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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|
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/* The above comments are too old! */ |
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|
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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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|
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#if 0 |
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static int preloaded_symbols = 0; |
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#endif |
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|
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static int internal_end_mcrypt(MCRYPT td); |
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|
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static int internal_init_mcrypt(MCRYPT td, void *key, int lenofkey, 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; |
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|
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if (lenofkey == 0) { |
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return MCRYPT_KEY_LEN_ERROR; /* error */ |
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} |
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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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|
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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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|
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if (sizes!=NULL) free(sizes); |
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|
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if (lenofkey > key_size) { |
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return MCRYPT_KEY_LEN_ERROR; /* error */ |
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} |
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|
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td->keyword_given = mxcalloc(1, mcrypt_enc_get_key_size(td)); |
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memmove(td->keyword_given, key, lenofkey); |
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td->akey = mxcalloc(1, mcrypt_get_size(td)); |
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td->abuf = mxcalloc(1, mcrypt_mode_get_size(td)); |
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|
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init_mcrypt(td, td->abuf, key, key_size, IV); |
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|
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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, mcrypt_enc_get_iv_size(td)); |
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|
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if (td->akey == NULL) { |
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internal_end_mcrypt(td); |
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return MCRYPT_UNKNOWN_ERROR; |
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} |
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return 0; |
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} |
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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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|
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mxfree(td->akey, mcrypt_get_size(td)); |
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td->akey = NULL; |
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|
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end_mcrypt(td, td->abuf); |
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mxfree(td->abuf, mcrypt_mode_get_size(td)); |
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td->abuf = NULL; |
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|
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return 0; |
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} |
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|
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/* Generic - High level functions */ |
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|
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WIN32DLL_DEFINE |
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int mcrypt_generic_init(const MCRYPT td, void *key, int lenofkey, 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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|
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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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|
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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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|
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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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|
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WIN32DLL_DEFINE |
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int mcrypt_generic_end(const MCRYPT td) |
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{ |
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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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|
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WIN32DLL_DEFINE |
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void mcrypt_perror(int err) |
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{ |
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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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} |
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return; |
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} |
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|
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WIN32DLL_DEFINE |
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char* mcrypt_strerror(int err) |
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{ |
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char* cerr=malloc(256); |
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|
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switch (err) { |
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case MCRYPT_UNKNOWN_ERROR: |
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sprintf(cerr, "Unknown error.\n"); |
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break; |
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case MCRYPT_ALGORITHM_MODE_INCOMPATIBILITY: |
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sprintf(cerr, |
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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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sprintf(cerr, "Key length is not legal.\n"); |
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break; |
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case MCRYPT_MEMORY_ALLOCATION_ERROR: |
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sprintf(cerr, "Memory allocation failed.\n"); |
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break; |
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case MCRYPT_UNKNOWN_MODE: |
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sprintf(cerr, "Unknown mode.\n"); |
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break; |
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case MCRYPT_UNKNOWN_ALGORITHM: |
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sprintf(cerr, "Unknown algorithm.\n"); |
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break; |
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|
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} |
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return cerr; |
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} |
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|
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WIN32DLL_DEFINE |
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int mcrypt_free(void *ptr) |
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{ |
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free(ptr); |
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return 0; |
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} |
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