mirror of https://gerrit.osmocom.org/libosmocore
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/*
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* gea.c
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*
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* Implementation of GEA3 and GEA4
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*
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* Copyright (C) 2016 by Sysmocom s.f.m.c. GmbH
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <osmocom/core/bits.h>
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#include <osmocom/crypt/gprs_cipher.h>
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#include <osmocom/crypt/auth.h>
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#include <osmocom/gsm/kasumi.h>
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#include <stdint.h>
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#include <string.h>
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/*! \brief Performs the GEA4 algorithm as in 3GPP TS 55.226 V9.0.0
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* \param[in,out] out Buffer for gamma for encrypted/decrypted
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* \param[in] len Length of out, in bytes
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* \param[in] kc Buffer with the ciphering key
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* \param[in] iv Init vector
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* \param[in] direct Direction: 0 (MS -> SGSN) or 1 (SGSN -> MS)
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*/
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int gea4(uint8_t *out, uint16_t len, uint8_t *kc, uint32_t iv,
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enum gprs_cipher_direction direction)
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{
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_kasumi_kgcore(0xFF, 0, iv, direction, kc, out, len * 8);
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return 0;
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}
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/*! \brief Performs the GEA3 algorithm as in 3GPP TS 55.216 V6.2.0
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* \param[in,out] out Buffer for gamma for encrypted/decrypted
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* \param[in] len Length of out, in bytes
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* \param[in] kc Buffer with the ciphering key
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* \param[in] iv Init vector
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* \param[in] direct Direction: 0 (MS -> SGSN) or 1 (SGSN -> MS)
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*/
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int gea3(uint8_t *out, uint16_t len, uint8_t *kc, uint32_t iv,
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enum gprs_cipher_direction direction)
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{
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uint8_t ck[gprs_cipher_key_length(GPRS_ALGO_GEA4)];
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osmo_c4(ck, kc);
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return gea4(out, len, ck, iv, direction);
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}
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