77 lines
2.7 KiB
C
77 lines
2.7 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 <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include "nas_stream_eia2.h"
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#include <arpa/inet.h>
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#include "aes_128_cbc_cmac.h"
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#include "assertions.h"
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#include "conversions.h"
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/*!
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* @brief Create integrity cmac t for a given message.
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* @param[in] stream_cipher Structure containing various variables to setup encoding
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* @param[out] out For EIA2 the output string is 32 bits long
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*/
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void nas_stream_encrypt_eia2(nas_stream_cipher_t const *stream_cipher, uint8_t out[4])
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{
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DevAssert(stream_cipher != NULL);
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DevAssert(stream_cipher->message != NULL);
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DevAssert(stream_cipher->bearer < 32);
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DevAssert((stream_cipher->blength & 0x7) == 0);
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cbc_cmac_ctx_t *ctx = (cbc_cmac_ctx_t *)stream_cipher->context;
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aes_128_t k_iv = {0};
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memcpy(&k_iv.key, ctx->key, 16);
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k_iv.type = AES_INITIALIZATION_VECTOR_8;
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k_iv.iv8.d.bearer = stream_cipher->bearer;
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k_iv.iv8.d.direction = stream_cipher->direction;
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k_iv.iv8.d.count = htonl(stream_cipher->count);
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size_t const m_length = stream_cipher->blength >> 3;
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uint8_t result[16] = {0};
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byte_array_t msg = {.buf = stream_cipher->message, .len = m_length };
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cipher_aes_128_cbc_cmac(ctx, &k_iv, msg, sizeof(result), result);
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memcpy(out, result, 4);
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}
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stream_security_context_t *stream_integrity_init_eia2(const uint8_t *integrity_key)
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{
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cbc_cmac_ctx_t *ret = calloc(1, sizeof(cbc_cmac_ctx_t));
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AssertFatal(ret != NULL, "out of memory\n");
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*ret = init_aes_128_cbc_cmac(integrity_key);
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return (stream_security_context_t *)ret;
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}
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void stream_integrity_free_eia2(stream_security_context_t *integrity_context)
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{
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free_aes_128_cbc_cmac((cbc_cmac_ctx_t *)integrity_context);
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free(integrity_context);
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}
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