Linux C hmac-sha1 算法（内核态）

本文为hmac sha1 的C语言源码，相关源码请查阅  Linux C sha1算法

#include 
#include 
#include 
#include 
#include 
#include 

#define MAX_MESSAGE_LENGTH 4096

unsigned long int ft(int t,unsigned long int x,unsigned long int y,unsigned long int z);
unsigned long int k(int t);
unsigned long int rotr1(int bits, unsigned long int a);
unsigned long int rotl(int bits, unsigned long int a);
void sha1(unsigned char *message,int message_length,unsigned char *digest);
void hmac_sha1(unsigned char *key,int key_length,unsigned char *data,int data_length,unsigned char *digest);

#include "hmac_sha1.h"

unsigned long int ft(int t,unsigned long int x,unsigned long int y,unsigned long int z)
{
    unsigned long