176 lines
4.5 KiB
C
176 lines
4.5 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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#include "../../../openair3/SECU/kdf.h"
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#include <stdint.h>
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#include <string.h>
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#include "osa_defs.h"
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#include "osa_internal.h"
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#include "common/utils/LOG/log.h"
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/*!
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* @brief Derive the keys from key and perform truncate on the generated key to
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* reduce his size to 128 bits. Definition of the derivation function can
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* be found in 3GPP TS.33401 #A.7
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* @param[in] alg_type Algorithm distinguisher
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* @param[in] alg_id Algorithm identifier.
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* Possible values are:
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* - 0 for EIA0 algorithm (Null Integrity Protection algorithm)
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* - 1 for 128-EIA1 SNOW 3G
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* - 2 for 128-EIA2 AES
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* @param[in] key The top key used to derive other subkeys
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* @param[out] out Pointer to reference where output of KDF will be stored.
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* NOTE: knas is dynamically allocated by the KDF function
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*/
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int derive_key(algorithm_type_dist_t alg_type, uint8_t alg_id, const uint8_t key[32], uint8_t **out)
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{
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uint8_t string[7] = {0};
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/* FC */
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string[0] = FC_ALG_KEY_DER;
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/* P0 = algorithm type distinguisher */
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string[1] = (uint8_t)(alg_type & 0xFF);
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/* L0 = length(P0) = 1 */
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string[2] = 0x00;
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string[3] = 0x01;
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/* P1 */
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string[4] = alg_id;
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/* L1 = length(P1) = 1 */
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string[5] = 0x00;
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string[6] = 0x01;
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#if defined(SECU_DEBUG)
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{
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int i;
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char payload[6 * sizeof(string) + 1];
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int index = 0;
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for (i = 0; i < sizeof(string); i++)
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index += sprintf(&payload[index], "0x%02x ", string[i]);
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LOG_D(OSA, "Key deriver input string: %s\n", payload);
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}
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#endif
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byte_array_t data = {.buf = string, .len = 7};
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if (*out == NULL) {
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*out = malloc(sizeof(uint8_t) * 32);
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DevAssert(*out != NULL && "Memory exhausted");
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}
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kdf(key, data, 32, *out);
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return 0;
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}
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int nr_derive_key(algorithm_type_dist_t alg_type, uint8_t alg_id, const uint8_t key[32], uint8_t **out)
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{
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uint8_t string[7];
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/* FC */
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string[0] = NR_FC_ALG_KEY_DER;
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/* P0 = algorithm type distinguisher */
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string[1] = (uint8_t)(alg_type & 0xFF);
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/* L0 = length(P0) = 1 */
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string[2] = 0x00;
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string[3] = 0x01;
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/* P1 */
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string[4] = alg_id;
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/* L1 = length(P1) = 1 */
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string[5] = 0x00;
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string[6] = 0x01;
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byte_array_t data = {.buf = string, .len = 7};
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if (*out == NULL) {
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*out = malloc(sizeof(uint8_t) * 32);
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DevAssert(*out != NULL && "Memory exhausted");
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}
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kdf(key, data, 32, *out);
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// in NR, we use the last 16 bytes, ignoring the first 16 ones
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memcpy(*out, *out + 16, 16);
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return 0;
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}
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int nr_derive_key_ng_ran_star(uint16_t pci, uint64_t nr_arfcn_dl, const uint8_t key[32], uint8_t *key_ng_ran_star)
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{
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uint8_t s[10] = {0};
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/* FC */
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s[0] = NR_FC_ALG_KEY_NG_RAN_STAR_DER;
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/* P0 = PCI */
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s[1] = (pci & 0x0000ff00) >> 8;
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s[2] = (pci & 0x000000ff);
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/* L0 = length(P0) = 2 */
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s[3] = 0x00;
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s[4] = 0x02;
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/* P1 = NR ARFCN */
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s[5] = (nr_arfcn_dl & 0x00ff0000) >> 16;
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s[6] = (nr_arfcn_dl & 0x0000ff00) >> 8;
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s[7] = (nr_arfcn_dl & 0x000000ff);
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/* L1 = length(P1) = 3 */
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s[8] = 0x00;
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s[9] = 0x03;
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byte_array_t data = {.buf = s, .len = 10};
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const uint32_t len_key = 32;
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kdf(key, data, len_key, key_ng_ran_star);
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return 0;
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}
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int derive_skgNB(const uint8_t *keNB, const uint16_t sk_counter, uint8_t *skgNB)
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{
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uint8_t s[5] = {0};
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/* FC is 0x1c (see 3gpp 33.401 annex A.15) */
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s[0] = 0x1c;
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/* put sk_counter */
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s[1] = (sk_counter >> 8) & 0xff;
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s[2] = sk_counter & 0xff;
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/* put length of sk_counter (2) */
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s[3] = 0x00;
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s[4] = 0x02;
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byte_array_t data = {.buf = s, .len = 5};
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kdf(keNB, data, 32, skgNB);
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return 0;
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}
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