文章目录
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。
博客内容主要围绕:
5G协议讲解
算力网络讲解(云计算,边缘计算,端计算)
高级C语言讲解
Rust语言讲解
【5G/4G】128-EEA2与128-NEA2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
nea2_eea2_stream.c
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <nettle/nettle-meta.h>
#include <nettle/aes.h>
#include <nettle/ctr.h>
#include "assert.h"
#include "conversions.h"
#include "secu_defs.h"
// #define SECU_DEBUG
int nea2_eea2(stream_cipher_t*stream_cipher, uint8_t *out)
{
uint8_t m[16];
uint32_t local_count;
void *ctx;
uint8_t *data;
uint32_t zero_bit = 0;
uint32_t byte_length;
assert(stream_cipher != NULL);
assert(out != NULL);
zero_bit = stream_cipher->blength & 0x7;
byte_length = stream_cipher->blength >> 3;
if (zero_bit > 0)
byte_length += 1;
ctx = malloc(nettle_aes128.context_size);
data = malloc(byte_length);
local_count = hton_int32(stream_cipher->count);
memset(m, 0, sizeof(m));
memcpy(&m[0], &local_count, 4);
m[4] = ((stream_cipher->bearer & 0x1F) << 3) |
((stream_cipher->direction & 0x01) << 2);
/* Other bits are 0 */
#if NETTLE_VERSION_MAJOR < 3
nettle_aes128.set_encrypt_key(ctx, stream_cipher->key_length,
stream_cipher->key);
#else
nettle_aes128.set_encrypt_key(ctx,
stream_cipher->key);
#endif
nettle_ctr_crypt(ctx, nettle_aes128.encrypt,
nettle_aes128.block_size, m,
byte_length, data, stream_cipher->message);
if (zero_bit > 0)
data[byte_length - 1] = data[byte_length - 1] & (uint8_t)(0xFF << (8 - zero_bit));
memcpy(out, data, byte_length);
free(data);
free(ctx);
return 0;
}
《Snow 3G算法源码介绍》
《128-bit AES算法源码介绍》
《ZUC算法源码介绍》
【5G/4G】128-EEA1与128-NEA1算法详解
【5G/4G】128-EEA2与128-NEA2算法详解
【5G/4G】128-EEA3与128-NEA3算法详解
【5G/4G】128-EIA1与128-NIA1算法详解
【5G/4G】128-EIA2与128-NIA2算法详解
【5G/4G】128-EIA3与128-NIA3算法详解