Sylvain Munaut | 12ba778 | 2014-06-16 10:13:40 +0200 | [diff] [blame] | 1 | #pragma once |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 2 | |
Pablo Neira Ayuso | 8341934 | 2011-03-22 16:36:13 +0100 | [diff] [blame] | 3 | #include <osmocom/core/linuxlist.h> |
Max | b897c42 | 2016-06-28 14:03:21 +0200 | [diff] [blame] | 4 | #include <osmocom/core/utils.h> |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 5 | |
Max | 4f16950 | 2016-06-30 10:39:00 +0200 | [diff] [blame] | 6 | #include <stdint.h> |
| 7 | |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 8 | #define GSM0464_CIPH_MAX_BLOCK 1523 |
| 9 | |
Max | dda9dff | 2016-06-28 17:05:35 +0200 | [diff] [blame] | 10 | /* 3GPP TS 24.008 ยง 10.5.5.3 */ |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 11 | enum gprs_ciph_algo { |
Max | dda9dff | 2016-06-28 17:05:35 +0200 | [diff] [blame] | 12 | GPRS_ALGO_GEA0 = 0, |
| 13 | GPRS_ALGO_GEA1 = 1, |
| 14 | GPRS_ALGO_GEA2 = 2, |
| 15 | GPRS_ALGO_GEA3 = 3, |
| 16 | GPRS_ALGO_GEA4 = 4, |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 17 | _GPRS_ALGO_NUM |
| 18 | }; |
| 19 | |
Max | c57e5da | 2016-06-27 16:19:12 +0200 | [diff] [blame] | 20 | /* 3GPP TS 04.64 Table A.1: */ |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 21 | enum gprs_cipher_direction { |
Max | c57e5da | 2016-06-27 16:19:12 +0200 | [diff] [blame] | 22 | GPRS_CIPH_MS2SGSN = 0, |
| 23 | GPRS_CIPH_SGSN2MS = 1, |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 24 | }; |
| 25 | |
Max | b897c42 | 2016-06-28 14:03:21 +0200 | [diff] [blame] | 26 | extern const struct value_string gprs_cipher_names[]; |
| 27 | |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 28 | /* An implementation of a GPRS cipher */ |
| 29 | struct gprs_cipher_impl { |
| 30 | struct llist_head list; |
| 31 | enum gprs_ciph_algo algo; |
| 32 | const char *name; |
| 33 | unsigned int priority; |
| 34 | |
| 35 | /* As specified in 04.64 Annex A. Uses Kc, IV and direction |
| 36 | * to generate the 1523 bytes cipher stream that need to be |
| 37 | * XORed wit the plaintext for encrypt / ciphertext for decrypt */ |
Max | bf990bb | 2016-04-21 14:46:30 +0200 | [diff] [blame] | 38 | int (*run)(uint8_t *out, uint16_t len, uint8_t *kc, uint32_t iv, |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 39 | enum gprs_cipher_direction direction); |
| 40 | }; |
| 41 | |
| 42 | /* register a cipher with the core (from a plugin) */ |
| 43 | int gprs_cipher_register(struct gprs_cipher_impl *ciph); |
| 44 | |
| 45 | /* load all available GPRS cipher plugins */ |
| 46 | int gprs_cipher_load(const char *path); |
| 47 | |
| 48 | /* function to be called by core code */ |
| 49 | int gprs_cipher_run(uint8_t *out, uint16_t len, enum gprs_ciph_algo algo, |
Max | bf990bb | 2016-04-21 14:46:30 +0200 | [diff] [blame] | 50 | uint8_t *kc, uint32_t iv, enum gprs_cipher_direction dir); |
Harald Welte | b9ce51c | 2010-06-30 19:43:11 +0200 | [diff] [blame] | 51 | |
| 52 | /* Do we have an implementation for this cipher? */ |
| 53 | int gprs_cipher_supported(enum gprs_ciph_algo algo); |
| 54 | |
Max | bf990bb | 2016-04-21 14:46:30 +0200 | [diff] [blame] | 55 | /* Return key length for supported cipher, in bytes */ |
| 56 | unsigned gprs_cipher_key_length(enum gprs_ciph_algo algo); |
| 57 | |
Harald Welte | e335b91 | 2010-06-30 19:50:14 +0200 | [diff] [blame] | 58 | /* GSM TS 04.64 / Section A.2.1 : Generation of 'input' */ |
| 59 | uint32_t gprs_cipher_gen_input_ui(uint32_t iov_ui, uint8_t sapi, uint32_t lfn, uint32_t oc); |
| 60 | |
| 61 | /* GSM TS 04.64 / Section A.2.1 : Generation of 'input' */ |
| 62 | uint32_t gprs_cipher_gen_input_i(uint32_t iov_i, uint32_t lfn, uint32_t oc); |