/*
- cipher.c -- Symmetric block cipher handling
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+ crypto.c -- stub cipher handling functions
+ Copyright (C) 2007-2022 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include "cipher.h"
-#include "logger.h"
#include "xalloc.h"
-static struct {
- const char *name;
- int algo;
- int mode;
- int nid;
-} ciphertable[] = {
- {"none", GCRY_CIPHER_NONE, GCRY_CIPHER_MODE_NONE, 0},
-
- {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_ECB, 92},
- {"blowfish", GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_CBC, 91},
- {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_CFB, 93},
- {NULL, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_OFB, 94},
-
- {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 418},
- {"aes", GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CBC, 419},
- {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CFB, 421},
- {NULL, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_OFB, 420},
-
- {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_ECB, 422},
- {"aes192", GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CBC, 423},
- {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CFB, 425},
- {NULL, GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_OFB, 424},
-
- {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_ECB, 426},
- {"aes256", GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC, 427},
- {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CFB, 429},
- {NULL, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, 428},
-};
-
-static bool nametocipher(const char *name, int *algo, int *mode) {
- int i;
-
- for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
- if(ciphertable[i].name && !strcasecmp(name, ciphertable[i].name)) {
- *algo = ciphertable[i].algo;
- *mode = ciphertable[i].mode;
- return true;
- }
- }
-
- return false;
-}
-
-static bool nidtocipher(int nid, int *algo, int *mode) {
- int i;
-
- for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
- if(nid == ciphertable[i].nid) {
- *algo = ciphertable[i].algo;
- *mode = ciphertable[i].mode;
- return true;
- }
- }
-
- return false;
-}
-
-static bool ciphertonid(int algo, int mode, int *nid) {
- int i;
-
- for(i = 0; i < sizeof ciphertable / sizeof *ciphertable; i++) {
- if(algo == ciphertable[i].algo && mode == ciphertable[i].mode) {
- *nid = ciphertable[i].nid;
- return true;
- }
- }
-
- return false;
-}
-
-static bool cipher_open(cipher_t *cipher, int algo, int mode) {
- gcry_error_t err;
-
- if(!ciphertonid(algo, mode, &cipher->nid)) {
- logger(LOG_DEBUG, _("Cipher %d mode %d has no corresponding nid!"), algo, mode);
- return false;
- }
-
- if((err = gcry_cipher_open(&cipher->handle, algo, mode, 0))) {
- logger(LOG_DEBUG, _("Unable to intialise cipher %d mode %d!"), algo, mode);
- return false;
- }
-
- cipher->keylen = gcry_cipher_get_algo_keylen(algo);
- if(mode == GCRY_CIPHER_MODE_ECB || mode == GCRY_CIPHER_MODE_CBC)
- cipher->blklen = gcry_cipher_get_algo_blklen(algo);
- else
- cipher->blklen = 0;
- cipher->key = xmalloc(cipher->keylen + cipher->blklen);
-
- return true;
-}
-
-bool cipher_open_by_name(cipher_t *cipher, const char *name) {
- int algo, mode;
-
- if(!nametocipher(name, &algo, &mode)) {
- logger(LOG_DEBUG, _("Unknown cipher name '%s'!"), name);
- return false;
- }
-
- return cipher_open(cipher, algo, mode);
-}
-
-bool cipher_open_by_nid(cipher_t *cipher, int nid) {
- int algo, mode;
-
- if(!nidtocipher(nid, &algo, &mode)) {
- logger(LOG_DEBUG, _("Unknown cipher ID %d!"), nid);
- return false;
- }
-
- return cipher_open(cipher, algo, mode);
-}
-
-bool cipher_open_blowfish_ofb(cipher_t *cipher) {
- return cipher_open(cipher, GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_OFB);
-}
-
-void cipher_close(cipher_t *cipher) {
- if(cipher->handle) {
- gcry_cipher_close(cipher->handle);
- cipher->handle = NULL;
- }
-
- if(cipher->key) {
- free(cipher->key);
- cipher->key = NULL;
- }
-}
-
-bool cipher_regenerate_key(cipher_t *cipher) {
- gcry_create_nonce(cipher->key, cipher->keylen + cipher->blklen);
-
- gcry_cipher_setkey(cipher->handle, cipher->key, cipher->keylen);
- gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen);
-
- return true;
-}
-
-bool cipher_add_padding(cipher_t *cipher, void *indata, size_t inlen, size_t *outlen) {
- size_t reqlen;
-
- if(cipher->blklen == 1) {
- *outlen = inlen;
- return true;
- }
-
- reqlen = ((inlen + 1) / cipher->blklen) * cipher->blklen;
- if(reqlen > *outlen)
- return false;
-
- // add padding
+#ifndef DISABLE_LEGACY
- *outlen = reqlen;
- return true;
+cipher_t *cipher_alloc(void) {
+ return xzalloc(sizeof(cipher_t));
}
-bool cipher_remove_padding(cipher_t *cipher, void *indata, size_t inlen, size_t *outlen) {
- size_t origlen;
-
- if(cipher->blklen == 1) {
- *outlen = inlen;
- return true;
- }
-
- if(inlen % cipher->blklen)
- return false;
-
- // check and remove padding
-
- *outlen = origlen;
- return true;
-}
-
-bool cipher_encrypt(cipher_t *cipher, void *indata, size_t inlen, void *outdata, size_t *outlen) {
- gcry_error_t err;
-
- if((err = gcry_cipher_encrypt(cipher->handle, outdata, inlen, indata, inlen))) {
- logger(LOG_ERR, _("Error while encrypting"));
- return false;
- }
-
- return true;
-}
-
-bool cipher_decrypt(cipher_t *cipher, void *indata, size_t inlen, void *outdata, size_t *outlen) {
- gcry_error_t err;
-
- if((err = gcry_cipher_decrypt(cipher->handle, outdata, inlen, indata, inlen))) {
- logger(LOG_ERR, _("Error while encrypting"));
- return false;
+void cipher_free(cipher_t **cipher) {
+ if(cipher && *cipher) {
+ cipher_close(*cipher);
+ free(*cipher);
+ *cipher = NULL;
}
-
- return true;
-}
-
-void cipher_reset(cipher_t *cipher) {
- gcry_cipher_reset(cipher->handle);
- gcry_cipher_setiv(cipher->handle, cipher->key + cipher->keylen, cipher->blklen);
-}
-
-int cipher_get_nid(cipher_t *cipher) {
- return cipher->nid;
}
+#endif // DISABLE_LEGACY
projects / tinc / blobdiff