162 lines
4.2 KiB
C
162 lines
4.2 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 <stdint.h>
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#include <nettle/hmac.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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static inline
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void kdf(const uint8_t *s, const uint32_t s_length, const uint8_t *key,
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const uint32_t key_length, uint8_t **out, uint32_t out_length)
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{
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struct hmac_sha256_ctx ctx;
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uint8_t *buffer;
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buffer = malloc(sizeof(uint8_t) * out_length);
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hmac_sha256_set_key(&ctx, key_length, key);
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hmac_sha256_update(&ctx, s_length, s);
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hmac_sha256_digest(&ctx, out_length, buffer);
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*out = buffer;
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}
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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,
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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] = 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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kdf(string, 7, key, 32, out, 32);
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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,
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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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kdf(string, 7, key, 32, out, 32);
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return 0;
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}
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/*
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int derive_keNB(const uint8_t key[32], const uint32_t nas_count, uint8_t **keNB)
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{
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uint8_t string[7];
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// FC
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string[0] = FC_KENB;
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// P0 = Uplink NAS count
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string[1] = (nas_count & 0xff000000) >> 24;
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string[2] = (nas_count & 0x00ff0000) >> 16;
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string[3] = (nas_count & 0x0000ff00) >> 8;
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string[4] = (nas_count & 0x000000ff);
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// Length of NAS count
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string[5] = 0x00;
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string[6] = 0x04;
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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, "KeNB deriver input string: %s\n", payload);
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}
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#endif
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kdf(string, 7, key, 32, keNB, 32);
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return 0;
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}
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*/
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