57 lines
2.2 KiB
C
57 lines
2.2 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 <arpa/inet.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 "aes_128_ctr.h"
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#include "assertions.h"
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#include "conversions.h"
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#include "nas_stream_eea2.h"
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void nas_stream_encrypt_eea2(nas_stream_cipher_t const *stream_cipher, uint8_t *out)
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{
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DevAssert(stream_cipher != NULL);
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DevAssert(stream_cipher->key != NULL);
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DevAssert(stream_cipher->key_length == 32);
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DevAssert(stream_cipher->bearer < 32);
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DevAssert(stream_cipher->direction < 2);
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DevAssert(stream_cipher->message != NULL);
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DevAssert(stream_cipher->blength > 7);
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aes_128_t p = {0};
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memcpy(p.key, stream_cipher->key, stream_cipher->key_length);
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p.type = AES_INITIALIZATION_VECTOR_16;
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p.iv16.d.count = htonl(stream_cipher->count);
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p.iv16.d.bearer = stream_cipher->bearer;
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p.iv16.d.direction = stream_cipher->direction;
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DevAssert((stream_cipher->blength & 0x07) == 0);
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const uint32_t byte_lenght = stream_cipher->blength >> 3;
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// Precondition: out must have enough space, at least as much as the input
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const size_t len_out = byte_lenght;
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byte_array_t msg = {.buf = stream_cipher->message, .len = byte_lenght};
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aes_128_ctr(&p, msg, len_out, out);
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}
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