Lionel Gauthier
6f5c0332a0
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5311 818b1a75-f10b-46b9-bf7c-635c3b92a50f
107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
#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 "secu_defs.h"
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#include <openssl/aes.h>
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#include <openssl/cmac.h>
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#include <openssl/evp.h>
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// test
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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#include <openssl/bio.h>
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#include "assertions.h"
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#include "conversions.h"
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#define SECU_DEBUG
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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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int nas_stream_encrypt_eia2(nas_stream_cipher_t *stream_cipher, uint8_t out[4])
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{
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uint8_t *m = NULL;
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uint32_t local_count;
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size_t size = 4;
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uint8_t data[16];
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CMAC_CTX *cmac_ctx = NULL;
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const EVP_CIPHER *cipher = EVP_aes_128_cbc();
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uint32_t zero_bit = 0;
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uint32_t m_length;
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int ret;
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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 > 0);
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DevAssert(out != NULL);
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memset(data, 0, 16);
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zero_bit = stream_cipher->blength & 0x7;
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m_length = stream_cipher->blength >> 3;
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if (zero_bit > 0)
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m_length += 1;
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local_count = hton_int32(stream_cipher->count);
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m = calloc(m_length + 8, sizeof(uint8_t));
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memcpy(&m[0], &local_count, 4);
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m[4] = ((stream_cipher->bearer & 0x1F) << 3) | ((stream_cipher->direction & 0x01) << 2);
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memcpy(&m[8], stream_cipher->message, m_length);
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#if defined(SECU_DEBUG)
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{
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int i;
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printf("Byte length: %u, Zero bits: %u\nm: ", m_length + 8, zero_bit);
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for (i = 0; i < m_length + 8; i++)
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printf("%02x", m[i]);
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printf("\nKey:");
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for (i = 0; i < stream_cipher->key_length; i++)
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printf("%02x", stream_cipher->key[i]);
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printf("\nMessage:");
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for (i = 0; i < m_length; i++)
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printf("%02x", stream_cipher->message[i]);
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printf("\n");
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}
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#endif
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cmac_ctx = CMAC_CTX_new();
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ret = CMAC_Init(cmac_ctx, stream_cipher->key, stream_cipher->key_length, cipher, NULL);
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#if defined(SECU_DEBUG)
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printf("CMAC_Init returned %d\n", ret);
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#endif
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ret = CMAC_Update(cmac_ctx, m, m_length + 8);
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#if defined(SECU_DEBUG)
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printf("CMAC_Update returned %d\n", ret);
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#endif
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CMAC_Final(cmac_ctx, data, &size);
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#if defined(SECU_DEBUG)
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printf("CMAC_Final returned %d, size = %u\n", ret, size);
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#endif
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CMAC_CTX_free(cmac_ctx);
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#if defined(SECU_DEBUG)
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{
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int i;
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printf("out: ");
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for (i = 0; i < size; i++)
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printf("%02x", data[i]);
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printf("\n");
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}
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#endif
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memcpy(out, data, 4);
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free(m);
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return 0;
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}
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