| /*! \file gprs_cipher.h */ |
| |
| #pragma once |
| |
| #include <osmocom/core/linuxlist.h> |
| #include <osmocom/core/utils.h> |
| |
| #include <stdint.h> |
| |
| #define GSM0464_CIPH_MAX_BLOCK 1523 |
| |
| /* 3GPP TS 24.008 ยง 10.5.5.3 */ |
| enum gprs_ciph_algo { |
| GPRS_ALGO_GEA0 = 0, |
| GPRS_ALGO_GEA1 = 1, |
| GPRS_ALGO_GEA2 = 2, |
| GPRS_ALGO_GEA3 = 3, |
| GPRS_ALGO_GEA4 = 4, |
| _GPRS_ALGO_NUM |
| }; |
| |
| /* 3GPP TS 04.64 Table A.1: */ |
| enum gprs_cipher_direction { |
| GPRS_CIPH_MS2SGSN = 0, |
| GPRS_CIPH_SGSN2MS = 1, |
| }; |
| |
| extern const struct value_string gprs_cipher_names[]; |
| |
| /* An implementation of a GPRS cipher */ |
| struct gprs_cipher_impl { |
| struct llist_head list; |
| enum gprs_ciph_algo algo; |
| const char *name; |
| unsigned int priority; |
| |
| /* As specified in 04.64 Annex A. Uses Kc, IV and direction |
| * to generate the 1523 bytes cipher stream that need to be |
| * XORed wit the plaintext for encrypt / ciphertext for decrypt */ |
| int (*run)(uint8_t *out, uint16_t len, uint8_t *kc, uint32_t iv, |
| enum gprs_cipher_direction direction); |
| }; |
| |
| /* register a cipher with the core (from a plugin) */ |
| int gprs_cipher_register(struct gprs_cipher_impl *ciph); |
| |
| /* load all available GPRS cipher plugins */ |
| int gprs_cipher_load(const char *path); |
| |
| /* function to be called by core code */ |
| int gprs_cipher_run(uint8_t *out, uint16_t len, enum gprs_ciph_algo algo, |
| uint8_t *kc, uint32_t iv, enum gprs_cipher_direction dir); |
| |
| /* Do we have an implementation for this cipher? */ |
| int gprs_cipher_supported(enum gprs_ciph_algo algo); |
| |
| /* Return key length for supported cipher, in bytes */ |
| unsigned gprs_cipher_key_length(enum gprs_ciph_algo algo); |
| |
| /* GSM TS 04.64 / Section A.2.1 : Generation of 'input' */ |
| uint32_t gprs_cipher_gen_input_ui(uint32_t iov_ui, uint8_t sapi, uint32_t lfn, uint32_t oc); |
| |
| /* GSM TS 04.64 / Section A.2.1 : Generation of 'input' */ |
| uint32_t gprs_cipher_gen_input_i(uint32_t iov_i, uint32_t lfn, uint32_t oc); |