diff options
Diffstat (limited to 'src/gprs_cipher_core.c')
-rw-r--r-- | src/gprs_cipher_core.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/gprs_cipher_core.c b/src/gprs_cipher_core.c new file mode 100644 index 00000000..a72dda84 --- /dev/null +++ b/src/gprs_cipher_core.c @@ -0,0 +1,85 @@ +/* GPRS LLC cipher core infrastructure */ + +/* (C) 2010 by Harald Welte <laforge@gnumonks.org> + * + * All Rights Reserved + * + * 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 + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 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., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include <errno.h> +#include <stdint.h> + +#include <osmocore/utils.h> +#include <osmocore/linuxlist.h> +#include <osmocore/plugin.h> + +#include <osmocom/crypt/gprs_cipher.h> + +static LLIST_HEAD(gprs_ciphers); + +static struct gprs_cipher_impl *selected_ciphers[_GPRS_ALGO_NUM]; + +/* register a cipher with the core */ +int gprs_cipher_register(struct gprs_cipher_impl *ciph) +{ + if (ciph->algo > ARRAY_SIZE(selected_ciphers)) + return -ERANGE; + + llist_add_tail(&ciph->list, &gprs_ciphers); + + /* check if we want to select this implementation over others */ + if (!selected_ciphers[ciph->algo] || + (selected_ciphers[ciph->algo]->priority > ciph->priority)) + selected_ciphers[ciph->algo] = ciph; + + return 0; +} + +/* load all available GPRS cipher plugins */ +int gprs_cipher_load(const char *path) +{ + /* load all plugins available from path */ + return plugin_load_all(path); +} + +/* function to be called by core code */ +int gprs_cipher_run(uint8_t *out, uint16_t len, enum gprs_ciph_algo algo, + uint64_t kc, uint32_t iv, enum gprs_cipher_direction dir) +{ + if (algo > ARRAY_SIZE(selected_ciphers)) + return -ERANGE; + + if (!selected_ciphers[algo]) + return -EINVAL; + + if (len > GSM0464_CIPH_MAX_BLOCK) + return -ERANGE; + + /* run the actual cipher from the plugin */ + return selected_ciphers[algo]->run(out, len, kc, iv, dir); +} + +int gprs_cipher_supported(enum gprs_ciph_algo algo) +{ + if (algo > ARRAY_SIZE(selected_ciphers)) + return -ERANGE; + + if (selected_ciphers[algo]) + return 1; + + return 0; +} |