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Move derive_kgnb to key_nas_deriver lib

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This commit is contained in:
Guido Casati
2025-06-09 20:10:01 +02:00
parent 1d2fb5af9d
commit d06790fcf2
3 changed files with 35 additions and 35 deletions
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openair3/NAS/NR_UE/nr_nas_msg.c
+1 -35
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@@ -71,6 +71,7 @@
#include "fgmm_service_accept.h"
#include "fgmm_service_reject.h"
#include "ds/byte_array.h"
#include "key_nas_deriver.h"
#define MAX_NAS_UE 4
@@ -444,41 +445,6 @@ void derive_knas(algorithm_type_dist_t nas_alg_type, uint8_t nas_alg_id, uint8_t
memcpy(knas, out + 16, 16);
}
static void derive_kgnb(uint8_t kamf[32], uint32_t count, uint8_t *kgnb)
{
/* Compute the KDF input parameter
* S = FC(0x6E) || UL NAS Count || 0x00 0x04 || 0x01 || 0x00 0x01
*/
uint8_t input[32] = {0};
// uint16_t length = 4;
// int offset = 0;
LOG_TRACE(INFO, "%s with count= %d", __FUNCTION__, count);
memset(input, 0, 32);
input[0] = 0x6E;
// P0
input[1] = count >> 24;
input[2] = (uint8_t)(count >> 16);
input[3] = (uint8_t)(count >> 8);
input[4] = (uint8_t)count;
// L0
input[5] = 0;
input[6] = 4;
// P1
input[7] = 0x01;
// L1
input[8] = 0;
input[9] = 1;
byte_array_t data = {.buf = input, .len = 10};
kdf(kamf, data, 32, kgnb);
printf("kgnb : ");
for (int pp = 0; pp < 32; pp++)
printf("%02x ", kgnb[pp]);
printf("\n");
}
static void derive_ue_keys(uint8_t *buf, nr_ue_nas_t *nas)
{
uint8_t ak[6];
openair3/SECU/key_nas_deriver.c
+32
View File
@@ -139,6 +139,38 @@ void nr_derive_key(algorithm_type_dist_t alg_type, uint8_t alg_id, const uint8_t
* NOTE: knas is dynamically allocated by the KDF function
*/
/** @brief KgNB derivation (A.9 3GPP TS 33.501) */
void derive_kgnb(uint8_t kamf[32], uint32_t count, uint8_t *kgnb)
{
/* Compute the KDF input parameter
* S = FC(0x6E) || UL NAS Count || 0x00 0x04 || 0x01 || 0x00 0x01
*/
uint8_t input[32] = {0};
input[0] = 0x6E;
// P0
input[1] = count >> 24;
input[2] = (uint8_t)(count >> 16);
input[3] = (uint8_t)(count >> 8);
input[4] = (uint8_t)count;
// L0
input[5] = 0;
input[6] = 4;
// P1
input[7] = 0x01;
// L1
input[8] = 0;
input[9] = 1;
byte_array_t data = {.buf = input, .len = 10};
kdf(kamf, data, 32, kgnb);
printf("kgnb : ");
for (int pp = 0; pp < 32; pp++)
printf("%02x ", kgnb[pp]);
printf("\n");
}
void derive_keNB(const uint8_t kasme[32], const uint32_t nas_count, uint8_t *keNB)
{
uint8_t s[7] = {0};
openair3/SECU/key_nas_deriver.h
+2
View File
@@ -14,6 +14,8 @@ typedef enum {
UP_INT_ALG = 0x06
} algorithm_type_dist_t;
void derive_kgnb(uint8_t kamf[32], uint32_t count, uint8_t *kgnb);
void derive_keNB(const uint8_t kasme[32], const uint32_t nas_count, uint8_t *keNB);
void derive_keNB_star(const uint8_t *kenb_32,