103 lines
2.8 KiB
C
103 lines
2.8 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 1.0 (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 <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 <nettle/nettle-meta.h>
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#include <nettle/aes.h>
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#include <nettle/ctr.h>
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#include "assertions.h"
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#include "conversions.h"
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#include "secu_defs.h"
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// #define SECU_DEBUG
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int nas_stream_encrypt_eea2(nas_stream_cipher_t *stream_cipher, uint8_t *out)
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{
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uint8_t m[16];
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uint32_t local_count;
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void *ctx;
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uint8_t *data;
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uint32_t zero_bit = 0;
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uint32_t byte_length;
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DevAssert(stream_cipher != NULL);
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DevAssert(out != NULL);
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zero_bit = stream_cipher->blength & 0x7;
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byte_length = stream_cipher->blength >> 3;
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if (zero_bit > 0)
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byte_length += 1;
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ctx = malloc(nettle_aes128.context_size);
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data = malloc(byte_length);
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local_count = hton_int32(stream_cipher->count);
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memset(m, 0, sizeof(m));
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memcpy(&m[0], &local_count, 4);
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m[4] = ((stream_cipher->bearer & 0x1F) << 3) |
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((stream_cipher->direction & 0x01) << 2);
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/* Other bits are 0 */
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#if defined(SECU_DEBUG)
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{
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int i;
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printf("Blength: %u, Zero bits: %u\n", stream_cipher->blength, zero_bit);
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for (i = 0; i < sizeof(m); i++)
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printf("0x%02x ", m[i]);
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printf("\n");
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}
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#endif
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#if NETTLE_VERSION_MAJOR < 3
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nettle_aes128.set_encrypt_key(ctx, stream_cipher->key_length,
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stream_cipher->key);
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#else
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nettle_aes128.set_encrypt_key(ctx,
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stream_cipher->key);
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#endif
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nettle_ctr_crypt(ctx, nettle_aes128.encrypt,
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nettle_aes128.block_size, m,
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byte_length, data, stream_cipher->message);
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if (zero_bit > 0)
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data[byte_length - 1] = data[byte_length - 1] & (uint8_t)(0xFF << (8 - zero_bit));
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memcpy(out, data, byte_length);
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free(data);
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free(ctx);
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return 0;
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}
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