Harald Welte | c918e4e | 2019-07-12 18:53:55 +0800 | [diff] [blame] | 1 | /* Utility functions from ogslib imported to TTCN-3 |
| 2 | * |
| 3 | * (C) 2019 Harald Welte <laforge@gnumonks.org> |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Released under the terms of GNU General Public License, Version 2 or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 10 | */ |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <string.h> |
| 14 | #include <errno.h> |
| 15 | #include <stdint.h> |
| 16 | |
| 17 | #include <Boolean.hh> |
| 18 | #include <Integer.hh> |
| 19 | #include <Octetstring.hh> |
| 20 | #include <Bitstring.hh> |
| 21 | |
| 22 | #include "snow-3g.h" |
| 23 | #include "key_derivation.h" |
| 24 | |
| 25 | //#define DEBUG |
| 26 | |
| 27 | #ifdef DEBUG |
| 28 | static __thread char hexd_buff[4096]; |
| 29 | static const char hex_chars[] = "0123456789abcdef"; |
| 30 | |
| 31 | static const char *_osmo_hexdump_buf(char *out_buf, size_t out_buf_size, const unsigned char *buf, int len, const char *delim, |
| 32 | bool delim_after_last) |
| 33 | { |
| 34 | int i; |
| 35 | char *cur = out_buf; |
| 36 | size_t delim_len; |
| 37 | |
| 38 | if (!out_buf || !out_buf_size) |
| 39 | return ""; |
| 40 | |
| 41 | delim = delim ? : ""; |
| 42 | delim_len = strlen(delim); |
| 43 | |
| 44 | for (i = 0; i < len; i++) { |
| 45 | const char *delimp = delim; |
| 46 | int len_remain = out_buf_size - (cur - out_buf) - 1; |
| 47 | if (len_remain < (2 + delim_len) |
| 48 | && !(!delim_after_last && i == (len - 1) && len_remain >= 2)) |
| 49 | break; |
| 50 | |
| 51 | *cur++ = hex_chars[buf[i] >> 4]; |
| 52 | *cur++ = hex_chars[buf[i] & 0xf]; |
| 53 | |
| 54 | if (i == (len - 1) && !delim_after_last) |
| 55 | break; |
| 56 | |
| 57 | while (len_remain > 1 && *delimp) { |
| 58 | *cur++ = *delimp++; |
| 59 | len_remain--; |
| 60 | } |
| 61 | } |
| 62 | *cur = '\0'; |
| 63 | return out_buf; |
| 64 | } |
| 65 | |
| 66 | static char *_osmo_hexdump(const unsigned char *buf, int len) |
| 67 | { |
| 68 | _osmo_hexdump_buf(hexd_buff, sizeof(hexd_buff), buf, len, "", true); |
| 69 | return hexd_buff; |
| 70 | } |
| 71 | #endif |
| 72 | |
| 73 | namespace LTE__CryptoFunctions { |
| 74 | |
| 75 | |
| 76 | /* f8. |
| 77 | * Input key: 128 bit Confidentiality Key as OCT16. |
| 78 | * Input count:32-bit Count, Frame dependent input as INTEGER. |
| 79 | * Input bearer: 5-bit Bearer identity (in the LSB side) as BIT5. |
| 80 | * Input is_dlwnlink: Direction of transmission. |
| 81 | * Input data: length number of bits, input bit stream as OCTETSTRING. |
| 82 | * Output data: Output bit stream. Assumes data is suitably memory |
| 83 | * allocated. |
| 84 | * Encrypts/decrypts blocks of data between 1 and 2^32 bits in length as |
| 85 | * defined in Section 3. |
| 86 | */ |
| 87 | OCTETSTRING f__snow__3g__f8(const OCTETSTRING& key, const INTEGER& count, const INTEGER & bearer, |
| 88 | const BOOLEAN& is_downlink, const OCTETSTRING& data) |
| 89 | { |
| 90 | TTCN_Buffer ttcn_buf_data(data); |
| 91 | TTCN_Buffer ttcn_buf_key(key); |
| 92 | uint32_t direction = (uint32_t)is_downlink; |
| 93 | |
| 94 | snow_3g_f8((u8 *)ttcn_buf_key.get_data(), (u32) count, (u32)bearer, direction, |
| 95 | (u8 *)ttcn_buf_data.get_data(), ttcn_buf_data.get_len()); |
| 96 | |
| 97 | return OCTETSTRING(ttcn_buf_data.get_len(), ttcn_buf_data.get_data()); |
| 98 | } |
| 99 | |
| 100 | /* f9. |
| 101 | * Input key: 128 bit Integrity Key as OCT16. |
| 102 | * Input count:32-bit Count, Frame dependent input as UINT32. |
| 103 | * Input fresh: 32-bit Random number as UINT32. |
| 104 | * Input is_downlink:1 Direction of transmission. |
| 105 | * Input data: input bit stream. |
| 106 | * Output : 32 bit block used as MAC |
| 107 | * Generates 32-bit MAC using UIA2 algorithm as defined in Section 4. |
| 108 | */ |
| 109 | |
| 110 | OCTETSTRING f__snow__3g__f9(const OCTETSTRING& key, const INTEGER& count, const INTEGER& fresh, |
| 111 | const BOOLEAN& is_downlink, const OCTETSTRING& data) |
| 112 | { |
| 113 | TTCN_Buffer ttcn_buf_data(data); |
| 114 | TTCN_Buffer ttcn_buf_key(key); |
| 115 | uint32_t direction = (uint32_t)is_downlink; |
| 116 | uint8_t tmp[4]; |
| 117 | TTCN_Buffer ttcn_buf_mac; |
| 118 | |
| 119 | #ifdef DEBUG |
| 120 | printf("F9: key=%s, count=%u, fresh=%u, direction=%u, ", |
| 121 | _osmo_hexdump((u8 *)ttcn_buf_key.get_data(), ttcn_buf_key.get_len()), (u32) count, |
| 122 | (u32) fresh, direction); |
| 123 | printf("data=%s -> ", _osmo_hexdump(ttcn_buf_data.get_data(), ttcn_buf_data.get_len())); |
| 124 | #endif |
| 125 | snow_3g_f9((u8 *)ttcn_buf_key.get_data(), (u32) count, (u32) fresh, direction, |
| 126 | (u8 *)ttcn_buf_data.get_data(), ttcn_buf_data.get_len()*8, tmp); |
| 127 | #ifdef DEBUG |
| 128 | printf("%s\n", _osmo_hexdump(tmp, sizeof(tmp))); |
| 129 | #endif |
| 130 | |
| 131 | return OCTETSTRING(4, tmp); |
| 132 | } |
| 133 | |
| 134 | OCTETSTRING f__kdf__kasme(const OCTETSTRING& ck, const OCTETSTRING& ik, const OCTETSTRING& plmn_id, |
| 135 | const OCTETSTRING& sqn, const OCTETSTRING& ak) |
| 136 | { |
| 137 | TTCN_Buffer ttcn_buf_ck(ck); |
| 138 | TTCN_Buffer ttcn_buf_ik(ik); |
| 139 | TTCN_Buffer ttcn_buf_plmn_id(plmn_id); |
| 140 | TTCN_Buffer ttcn_buf_sqn(sqn); |
| 141 | TTCN_Buffer ttcn_buf_ak(ak); |
| 142 | uint8_t kasme[32]; |
| 143 | |
| 144 | hss_auc_kasme(ttcn_buf_ck.get_data(), ttcn_buf_ik.get_data(), ttcn_buf_plmn_id.get_data(), |
| 145 | ttcn_buf_sqn.get_data(), ttcn_buf_ak.get_data(), kasme); |
| 146 | return OCTETSTRING(sizeof(kasme), kasme); |
| 147 | } |
| 148 | |
| 149 | OCTETSTRING f__kdf__nas__int(const INTEGER& alg_id, const OCTETSTRING &kasme) |
| 150 | { |
| 151 | TTCN_Buffer ttcn_buf_kasme(kasme); |
| 152 | uint8_t knas[16]; |
| 153 | |
| 154 | mme_kdf_nas(MME_KDF_NAS_INT_ALG, (int)alg_id, (const u8*) ttcn_buf_kasme.get_data(), knas); |
| 155 | return OCTETSTRING(sizeof(knas), knas); |
| 156 | } |
| 157 | |
| 158 | OCTETSTRING f__kdf__nas__enc(const INTEGER& alg_id, const OCTETSTRING &kasme) |
| 159 | { |
| 160 | TTCN_Buffer ttcn_buf_kasme(kasme); |
| 161 | uint8_t knas[16]; |
| 162 | |
| 163 | mme_kdf_nas(MME_KDF_NAS_ENC_ALG, (int)alg_id, (const u8*) ttcn_buf_kasme.get_data(), knas); |
| 164 | return OCTETSTRING(sizeof(knas), knas); |
| 165 | } |
| 166 | |
| 167 | |
| 168 | OCTETSTRING f__kdf__enb(const OCTETSTRING &kasme, const INTEGER &ul_count) |
| 169 | { |
| 170 | TTCN_Buffer ttcn_buf_kasme(kasme); |
| 171 | uint8_t kenb[32]; |
| 172 | |
| 173 | mme_kdf_enb(ttcn_buf_kasme.get_data(), (int)ul_count, kenb); |
| 174 | return OCTETSTRING(sizeof(kenb), kenb); |
| 175 | } |
| 176 | |
| 177 | OCTETSTRING f__kdf__nh(const OCTETSTRING &kasme, const OCTETSTRING &sync_inp) |
| 178 | { |
| 179 | TTCN_Buffer ttcn_buf_kasme(kasme); |
| 180 | TTCN_Buffer ttcn_buf_sync_inp(sync_inp); |
| 181 | uint8_t kenb[32]; |
| 182 | |
| 183 | mme_kdf_nh(ttcn_buf_kasme.get_data(), ttcn_buf_sync_inp.get_data(), kenb); |
| 184 | return OCTETSTRING(sizeof(kenb), kenb); |
| 185 | } |
| 186 | |
| 187 | |
| 188 | |
| 189 | } // namespace |