#include <stdlib.h>
#include <openssl/evp.h>
#include <openssl/md5.h>
#include <openssl/hmac.h>

#include"string.h"



#include <openssl/hmac.h>
 unsigned char *HMAC(const EVP_MD *evp_md, const void *key,
               int key_len, const unsigned char *d, int n,
               unsigned char *md, unsigned int *md_len);


HMAC(EVP_md5(),key,key_len, d, n, md, md_len
);

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