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104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
/**
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* Copyright 2013-2022 Software Radio Systems Limited
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*
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* This file is part of srsRAN.
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*
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* srsRAN is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsRAN is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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/*
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* Adapted from ETSI/SAGE specifications:
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* "Specification of the 3GPP Confidentiality and
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* Integrity Algorithms UEA2 & UIA2.
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* Document 1: UEA2 and UIA2 Specification"
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* "Specification of the 3GPP Confidentiality
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* and Integrity Algorithms UEA2 & UIA2.
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* Document 2: SNOW 3G Specification"
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*/
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#ifndef SRSRAN_S3G_H
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#define SRSRAN_S3G_H
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#include <math.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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typedef struct {
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uint32_t* lfsr;
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uint32_t* fsm;
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} S3G_STATE;
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/* Initialization.
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* Input k[4]: Four 32-bit words making up 128-bit key.
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* Input IV[4]: Four 32-bit words making 128-bit initialization variable.
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* Output: All the LFSRs and FSM are initialized for key generation.
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* See Section 4.1.
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*/
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void s3g_initialize(S3G_STATE* state, uint32_t k[4], uint32_t iv[4]);
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/*********************************************************************
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Name: s3g_deinitialize
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Description: Deinitialization.
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Document Reference: Specification of the 3GPP Confidentiality and
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Integrity Algorithms UEA2 & UIA2 D2 v1.1
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*********************************************************************/
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void s3g_deinitialize(S3G_STATE* state);
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/* Generation of Keystream.
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* input n: number of 32-bit words of keystream.
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* input z: space for the generated keystream, assumes
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* memory is allocated already.
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* output: generated keystream which is filled in z
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* See section 4.2.
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*/
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void s3g_generate_keystream(S3G_STATE* state, uint32_t n, uint32_t* ks);
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/* f8.
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* Input key: 128 bit Confidentiality Key.
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* Input count:32-bit Count, Frame dependent input.
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* Input bearer: 5-bit Bearer identity (in the LSB side).
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* Input dir:1 bit, direction of transmission.
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* Input data: length number of bits, input bit stream.
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* Input length: 32 bit Length, i.e., the number of bits to be encrypted or
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* decrypted.
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* Output data: Output bit stream. Assumes data is suitably memory
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* allocated.
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* Encrypts/decrypts blocks of data between 1 and 2^32 bits in length as
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* defined in Section 3.
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*/
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// void snow3g_f8(u8* key, u32 count, u32 bearer, u32 dir, u8* data, u32 length);
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/* f9.
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* Input key: 128 bit Integrity Key.
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* Input count:32-bit Count, Frame dependent input.
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* Input fresh: 32-bit Random number.
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* Input dir:1 bit, direction of transmission (in the LSB).
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* Input data: length number of bits, input bit stream.
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* Input length: 64 bit Length, i.e., the number of bits to be MAC'd.
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* Output : 32 bit block used as MAC
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* Generates 32-bit MAC using UIA2 algorithm as defined in Section 4.
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*/
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uint8_t* s3g_f9(const uint8_t* key, uint32_t count, uint32_t fresh, uint32_t dir, uint8_t* data, uint64_t length);
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#endif // SRSRAN_S3G_H
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