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[数据结构与算法]【5G/4G】128-EIA2与128-NIA2算法详解

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【5G/4G】128-EIA2与128-NIA2算法详解

本人就职于国际知名终端厂商，负责modem芯片研发。
在5G早期负责终端数据业务层、核心网相关的开发工作，目前牵头6G算力网络技术标准研究。

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【5G/4G】128-EIA2与128-NIA2算法详解

secu_defs.h

typedef struct {
  uint8_t *key;
  uint32_t key_length;
  uint32_t count;
  uint8_t  bearer;
  uint8_t  direction;
  uint8_t  *message;
  /* length in bits */
  uint32_t  blength;
} stream_cipher_t;

conversions.h

/* Endianness conversions for 16 and 32 bits integers from host to network order */
#if (BYTE_ORDER == LITTLE_ENDIAN)
# define hton_int32(x)   \
    (((x & 0x000000FF) << 24) | ((x & 0x0000FF00) << 8) |  \
    ((x & 0x00FF0000) >> 8) | ((x & 0xFF000000) >> 24))

# define hton_int16(x)   \
    (((x & 0x00FF) << 8) | ((x & 0xFF00) >> 8)

# define ntoh_int32_buf(bUF)        \
    ((*(bUF)) << 24) | ((*((bUF) + 1)) << 16) | ((*((bUF) + 2)) << 8)   \
  | (*((bUF) + 3))
#else
# define hton_int32(x) (x)
# define hton_int16(x) (x)
#endif

nia2_eia2_stream.c

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>

#include <openssl/aes.h>
#include <openssl/cmac.h>
#include <openssl/evp.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/bio.h>

#include "assert.h"
#include "conversions.h"
#include "secu_defs.h"

/*!
 * @brief Create integrity cmac t for a given message.
 * @param[in] stream_cipher Structure containing various variables to setup encoding
 * @param[out] out For EIA2 the output string is 32 bits long
 */
int nia2_eia2(stream_cipher_t*stream_cipher, uint8_t out[4])
{
  uint8_t          *m            = NULL;
  uint32_t          local_count;
  size_t            size         = 4;
  uint8_t           data[16];
  CMAC_CTX         *cmac_ctx     = NULL;
  const EVP_CIPHER *cipher       = EVP_aes_128_cbc();
  uint32_t          zero_bit     = 0;
  uint32_t          m_length;
  int               ret;

  assert(stream_cipher != NULL);
  assert(stream_cipher->key != NULL);
  assert(stream_cipher->key_length > 0);
  assert(out != NULL);

  memset(data, 0, 16);

  zero_bit = stream_cipher->blength & 0x7;

  m_length = stream_cipher->blength >> 3;

  if (zero_bit > 0)
    m_length += 1;

  local_count = hton_int32(stream_cipher->count);

  m = calloc(m_length + 8, sizeof(uint8_t));

  memcpy(&m[0], &local_count, 4);
  m[4] = ((stream_cipher->bearer & 0x1F) << 3) | ((stream_cipher->direction & 0x01) << 2);

  memcpy(&m[8], stream_cipher->message, m_length);
  cmac_ctx = CMAC_CTX_new();
  ret = CMAC_Init(cmac_ctx, stream_cipher->key, stream_cipher->key_length, cipher, NULL);
  ret = CMAC_Update(cmac_ctx, m, m_length + 8);
  (void)ret; /* avoid gcc warning "set but not used" */
  CMAC_Final(cmac_ctx, data, &size);
  CMAC_CTX_free(cmac_ctx);
  memcpy(out, data, 4);
  free(m);

  return 0;
}